Merge branch 'develop' into l10n_develop

.github/scripts/setup.sh

@@ -1,9 +1,16 @@
 #!/bin/bash
 
-sudo gem install cocoapods-keys
+# workaround https://github.com/CocoaPods/CocoaPods/issues/11355
+sed -i '' $'1s/^/source "https:\\/\\/github.com\\/CocoaPods\\/Specs.git"\\\n\\\n/' Podfile
+
+# Install Ruby Bundler
+gem install bundler:2.3.11
+
+# Install Ruby Gems
+bundle install
 
 # stub keys. DO NOT use in production
-pod keys set notification_endpoint "<endpoint>"
+bundle exec pod keys set notification_endpoint "<endpoint>"
-pod keys set notification_endpoint_debug "<endpoint>"
+bundle exec pod keys set notification_endpoint_debug "<endpoint>"
 
-pod install
+bundle exec pod install

AppShared/AppSecret.swift

@@ -10,10 +10,7 @@ import Foundation
 import CryptoKit
 import KeychainAccess
 import Keys
-
+import MastodonCommon
-enum AppName {
-    public static let groupID = "group.org.joinmastodon.app"
-}
 
 public final class AppSecret {
     

AppShared/Info.plist

@@ -15,8 +15,8 @@
 	<key>CFBundlePackageType</key>
 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.3.0</string>
+	<string>1.4.2</string>
 	<key>CFBundleVersion</key>
-	<string>109</string>
+	<string>127</string>
 </dict>
 </plist>

Documentation/Setup.md

@@ -12,12 +12,13 @@ Intell the latest version of Xcode from the App Store or Apple Developer Downloa
 This guide may not suit your machine and actually setup procedure may change in the future. Please file the issue or Pull Request if there are any problems.
 
 ## CocoaPods
-The app use [CocoaPods]() and [CocoaPods-Keys](https://github.com/orta/cocoapods-keys). The M1 Mac needs virtual ruby env to workaround compatibility issues.
+The app use [CocoaPods]() and [CocoaPods-Keys](https://github.com/orta/cocoapods-keys). Ruby Gems are managed through Bundler. The M1 Mac needs virtual ruby env to workaround compatibility issues.
 
 #### Intel Mac
 
 ```zsh
-sudo gem install cocoapods cocoapods-keys
+gem install bundler
+bundle install
 ```
 
 #### M1 Mac
@@ -40,18 +41,19 @@ rbenv global 3.0.3
 ruby --version
 # > ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [arm64-darwin21]
 
-sudo gem install cocoapods cocoapods-keys
+gem install bundler
+bundle install
 ```
 
 ## Bootstrap
 
 ```zsh
 # make a clean build
-sudo gem install cocoapods-clean
+bundle install
-pod clean
+bundle exec pod clean
 
 # make install
-pod install --repo-update
+bundle exec pod install --repo-update
 
 # open workspace
 open Mastodon.xcworkspace

Gemfile

@@ -0,0 +1,6 @@
+source "https://rubygems.org"
+
+gem "cocoapods"
+gem "cocoapods-clean"
+gem "cocoapods-keys"
+

Gemfile.lock

@@ -0,0 +1,109 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    CFPropertyList (3.0.5)
+      rexml
+    RubyInline (3.12.5)
+      ZenTest (~> 4.3)
+    ZenTest (4.12.1)
+    activesupport (6.1.5.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    algoliasearch (1.27.5)
+      httpclient (~> 2.8, >= 2.8.3)
+      json (>= 1.5.1)
+    atomos (0.1.3)
+    claide (1.1.0)
+    cocoapods (1.11.3)
+      addressable (~> 2.8)
+      claide (>= 1.0.2, < 2.0)
+      cocoapods-core (= 1.11.3)
+      cocoapods-deintegrate (>= 1.0.3, < 2.0)
+      cocoapods-downloader (>= 1.4.0, < 2.0)
+      cocoapods-plugins (>= 1.0.0, < 2.0)
+      cocoapods-search (>= 1.0.0, < 2.0)
+      cocoapods-trunk (>= 1.4.0, < 2.0)
+      cocoapods-try (>= 1.1.0, < 2.0)
+      colored2 (~> 3.1)
+      escape (~> 0.0.4)
+      fourflusher (>= 2.3.0, < 3.0)
+      gh_inspector (~> 1.0)
+      molinillo (~> 0.8.0)
+      nap (~> 1.0)
+      ruby-macho (>= 1.0, < 3.0)
+      xcodeproj (>= 1.21.0, < 2.0)
+    cocoapods-clean (0.0.1)
+    cocoapods-core (1.11.3)
+      activesupport (>= 5.0, < 7)
+      addressable (~> 2.8)
+      algoliasearch (~> 1.0)
+      concurrent-ruby (~> 1.1)
+      fuzzy_match (~> 2.0.4)
+      nap (~> 1.0)
+      netrc (~> 0.11)
+      public_suffix (~> 4.0)
+      typhoeus (~> 1.0)
+    cocoapods-deintegrate (1.0.5)
+    cocoapods-downloader (1.6.3)
+    cocoapods-keys (2.2.1)
+      dotenv
+      osx_keychain
+    cocoapods-plugins (1.0.0)
+      nap
+    cocoapods-search (1.0.1)
+    cocoapods-trunk (1.6.0)
+      nap (>= 0.8, < 2.0)
+      netrc (~> 0.11)
+    cocoapods-try (1.2.0)
+    colored2 (3.1.2)
+    concurrent-ruby (1.1.10)
+    dotenv (2.7.6)
+    escape (0.0.4)
+    ethon (0.15.0)
+      ffi (>= 1.15.0)
+    ffi (1.15.5)
+    fourflusher (2.3.1)
+    fuzzy_match (2.0.4)
+    gh_inspector (1.1.3)
+    httpclient (2.8.3)
+    i18n (1.10.0)
+      concurrent-ruby (~> 1.0)
+    json (2.6.1)
+    minitest (5.15.0)
+    molinillo (0.8.0)
+    nanaimo (0.3.0)
+    nap (1.1.0)
+    netrc (0.11.0)
+    osx_keychain (1.0.2)
+      RubyInline (~> 3)
+    public_suffix (4.0.7)
+    rexml (3.2.5)
+    ruby-macho (2.5.1)
+    typhoeus (1.4.0)
+      ethon (>= 0.9.0)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
+    xcodeproj (1.21.0)
+      CFPropertyList (>= 2.3.3, < 4.0)
+      atomos (~> 0.1.3)
+      claide (>= 1.0.2, < 2.0)
+      colored2 (~> 3.1)
+      nanaimo (~> 0.3.0)
+      rexml (~> 3.2.4)
+    zeitwerk (2.5.4)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  cocoapods
+  cocoapods-clean
+  cocoapods-keys
+
+BUNDLED WITH
+   2.3.11

Localization/Localizable.stringsdict

@@ -90,6 +90,28 @@
             <string>posts</string>
         </dict>
     </dict>
+    <key>plural.count.media</key>
+    <dict>
+        <key>NSStringLocalizedFormatKey</key>
+        <string>%#@media_count@</string>
+        <key>media_count</key>
+        <dict>
+            <key>NSStringFormatSpecTypeKey</key>
+            <string>NSStringPluralRuleType</string>
+            <key>NSStringFormatValueTypeKey</key>
+            <string>ld</string>
+            <key>zero</key>
+            <string>0 media</string>
+            <key>one</key>
+            <string>1 media</string>
+            <key>few</key>
+            <string>%ld media</string>
+            <key>many</key>
+            <string>%ld media</string>
+            <key>other</key>
+            <string>%ld media</string>
+        </dict>
+    </dict>
     <key>plural.count.post</key>
     <dict>
         <key>NSStringLocalizedFormatKey</key>

Localization/StringsConvertor/Sources/StringsConvertor/main.swift

@@ -51,19 +51,25 @@ private func map(language: String) -> String? {
     case "eu_ES":   return "eu-ES"      // Basque
     case "ca_ES":   return "ca"         // Catalan
     case "zh_CN":   return "zh-Hans"    // Chinese Simplified
+    case "zh_TW":   return "zh-Hant"    // Chinese Traditional
     case "nl_NL":   return "nl"         // Dutch
     case "en_US":   return "en"
     case "fr_FR":   return "fr"         // French
+    case "gl_ES":   return "gl"         // Galician
     case "de_DE":   return "de"         // German
+    case "it_IT":   return "it"         // Italian
     case "ja_JP":   return "ja"         // Japanese
     case "kab_KAB": return "kab"        // Kabyle
     case "kmr_TR":  return "ku"         // Kurmanji (Kurdish)
     case "ru_RU":   return "ru"         // Russian
     case "gd_GB":   return "gd-GB"      // Scottish Gaelic
+    case "ckb_IR":  return "ckb"        // Sorani (Kurdish)
     case "es_ES":   return "es"         // Spanish
     case "es_AR":   return "es-419"     // Spanish, Argentina
+    case "sv-SE":   return "sv"         // Swedish
     case "sv_FI":   return "sv_FI"      // Swedish, Finland
     case "th_TH":   return "th"         // Thai
+    case "tr_TR":   return "tr"         // Turkish
     case "vi_VN":   return "vi"         // Vietnamese
     default:        return nil
     }

Localization/app.json

@@ -129,6 +129,7 @@
                 "show_post": "Show Post",
                 "show_user_profile": "Show user profile",
                 "content_warning": "Content Warning",
+                "sensitive_content": "Sensitive Content",
                 "media_content_warning": "Tap anywhere to reveal",
                 "tap_to_reveal": "Tap to reveal",
                 "poll": {
@@ -210,9 +211,9 @@
             "log_in": "Log In"
         },
         "server_picker": {
-            "title": "Mastodon is made of users in different communities.",
+            "title": "Mastodon is made of users in different servers.",
-            "subtitle": "Pick a community based on your interests, region, or a general purpose one.",
+            "subtitle": "Pick a server based on your interests, region, or a general purpose one.",
-            "subtitle_extend": "Pick a community based on your interests, region, or a general purpose one. Each community is operated by an entirely independent organization or individual.",
+            "subtitle_extend": "Pick a server based on your interests, region, or a general purpose one. Each server is operated by an entirely independent organization or individual.",
             "button": {
                 "category": {
                     "all": "All",
@@ -239,7 +240,8 @@
                 "category": "CATEGORY"
             },
             "input": {
-                "placeholder": "Search communities"
+                "placeholder": "Search servers",
+                "search_servers_or_enter_url": "Search communities or enter URL"
             },
             "empty_state": {
                 "finding_servers": "Finding available servers...",
@@ -249,6 +251,7 @@
         },
         "register": {
             "title": "Let’s get you set up on %s",
+            "lets_get_you_set_up_on_domain": "Let’s get you set up on %s",
             "input": {
                 "avatar": {
                     "delete": "Delete"
@@ -319,6 +322,7 @@
         "confirm_email": {
             "title": "One last thing.",
             "subtitle": "Tap the link we emailed to you to verify your account.",
+            "tap_the_link_we_emailed_to_you_to_verify_your_account": "Tap the link we emailed to you to verify your account",
             "button": {
                 "open_email_app": "Open Email App",
                 "resend": "Resend"
@@ -341,7 +345,11 @@
                 "offline": "Offline",
                 "new_posts": "See new posts",
                 "published": "Published!",
-                "Publishing": "Publishing post..."
+                "Publishing": "Publishing post...",
+                "accessibility": {
+                    "logo_label": "Logo Button",
+                    "logo_hint": "Tap to scroll to top and tap again to previous location"
+                }
             }
         },
         "suggestion_account": {
@@ -492,6 +500,16 @@
                 "clear": "Clear"
             }
         },
+        "discovery": {
+            "tabs": {
+                "posts": "Posts",
+                "hashtags": "Hashtags",
+                "news": "News",
+                "community": "Community",
+                "for_you": "For You"
+            },
+            "intro": "These are the posts gaining traction in your corner of Mastodon."
+        },
         "favorite": {
             "title": "Your Favorites"
         },
@@ -585,7 +603,49 @@
             "send": "Send Report",
             "skip_to_send": "Send without comment",
             "text_placeholder": "Type or paste additional comments",
-            "reported": "REPORTED"
+            "reported": "REPORTED",
+            "step_one": {
+                "step_1_of_4": "Step 1 of 4",
+                "whats_wrong_with_this_post": "What's wrong with this post?",
+                "whats_wrong_with_this_account": "What's wrong with this account?",
+                "whats_wrong_with_this_username": "What's wrong with %s?",
+                "select_the_best_match": "Select the best match",
+                "i_dont_like_it": "I don’t like it",
+                "it_is_not_something_you_want_to_see": "It is not something you want to see",
+                "its_spam": "It’s spam",
+                "malicious_links_fake_engagement_or_repetetive_replies": "Malicious links, fake engagement, or repetetive replies",
+                "it_violates_server_rules": "It violates server rules",
+                "you_are_aware_that_it_breaks_specific_rules": "You are aware that it breaks specific rules",
+                "its_something_else": "It’s something else",
+                "the_issue_does_not_fit_into_other_categories": "The issue does not fit into other categories"
+            },
+            "step_two": {
+                "step_2_of_4": "Step 2 of 4",
+                "which_rules_are_being_violated": "Which rules are being violated?",
+                "select_all_that_apply": "Select all that apply",
+                "i_just_don’t_like_it": "I just don’t like it"
+            },
+            "step_three": {
+                "step_3_of_4": "Step 3 of 4",
+                "are_there_any_posts_that_back_up_this_report": "Are there any posts that back up this report?",
+                "select_all_that_apply": "Select all that apply"
+            },
+            "step_four": {
+                "step_4_of_4": "Step 4 of 4",
+                "is_there_anything_else_we_should_know": "Is there anything else we should know?"
+            },
+            "step_final": {
+                "dont_want_to_see_this": "Don’t want to see this?",
+                "when_you_see_something_you_dont_like_on_mastodon_you_can_remove_the_person_from_your_experience.": "When you see something you don’t like on Mastodon, you can remove the person from your experience.",
+                "unfollow": "Unfollow",
+                "unfollowed": "Unfollowed",
+                "unfollow_user": "Unfollow %s",
+                "mute_user": "Mute %s",
+                "you_wont_see_their_posts_or_reblogs_in_your_home_feed_they_wont_know_they_ve_been_muted": "You won’t see their posts or reblogs in your home feed. They won’t know they’ve been muted.",
+                "block_user": "Block %s",
+                "they_will_no_longer_be_able_to_follow_or_see_your_posts_but_they_can_see_if_theyve_been_blocked": "They will no longer be able to follow or see your posts, but they can see if they’ve been blocked.",
+                "while_we_review_this_you_can_take_action_against_user": "While we review this, you can take action against %s"
+            }
         },
         "preview": {
             "keyboard": {

Mastodon.xcodeproj/xcshareddata/xcschemes/Mastodon - Release.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1250"
+   LastUpgradeVersion = "1330"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

Mastodon.xcodeproj/xcshareddata/xcschemes/Mastodon - Snapshot.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1250"
+   LastUpgradeVersion = "1330"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

Mastodon.xcodeproj/xcshareddata/xcschemes/Mastodon.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1250"
+   LastUpgradeVersion = "1330"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

Mastodon.xcodeproj/xcuserdata/mainasuk.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -9,33 +9,38 @@
 			<key>isShown</key>
 			<true/>
 			<key>orderHint</key>
-			<integer>4</integer>
+			<integer>5</integer>
 		</dict>
 		<key>CoreDataStack.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
 			<integer>27</integer>
 		</dict>
-		<key>Mastodon - RTL.xcscheme_^#shared#^_</key>
+		<key>Mastodon - Profile.xcscheme_^#shared#^_</key>
-		<dict>
-			<key>orderHint</key>
-			<integer>19</integer>
-		</dict>
-		<key>Mastodon - Release.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
 			<integer>1</integer>
 		</dict>
-		<key>Mastodon - Snapshot.xcscheme_^#shared#^_</key>
+		<key>Mastodon - RTL.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>8</integer>
+		</dict>
+		<key>Mastodon - Release.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
 			<integer>2</integer>
 		</dict>
-		<key>Mastodon - ar.xcscheme</key>
+		<key>Mastodon - Snapshot.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
 			<integer>3</integer>
 		</dict>
+		<key>Mastodon - ar.xcscheme</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>4</integer>
+		</dict>
 		<key>Mastodon - ar.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
@@ -109,7 +114,7 @@
 		<key>MastodonIntent.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>24</integer>
+			<integer>31</integer>
 		</dict>
 		<key>MastodonIntents.xcscheme_^#shared#^_</key>
 		<dict>
@@ -124,12 +129,12 @@
 		<key>NotificationService.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>22</integer>
+			<integer>30</integer>
 		</dict>
 		<key>ShareActionExtension.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>23</integer>
+			<integer>32</integer>
 		</dict>
 	</dict>
 	<key>SuppressBuildableAutocreation</key>

Mastodon.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -6,8 +6,8 @@
         "repositoryURL": "https://github.com/Alamofire/Alamofire.git",
         "state": {
           "branch": null,
-          "revision": "f82c23a8a7ef8dc1a49a8bfc6a96883e79121864",
+          "revision": "354dda32d89fc8cd4f5c46487f64957d355f53d8",
-          "version": "5.5.0"
+          "version": "5.6.1"
         }
       },
       {
@@ -55,6 +55,15 @@
           "version": "1.2.0"
         }
       },
+      {
+        "package": "FaviconFinder",
+        "repositoryURL": "https://github.com/will-lumley/FaviconFinder.git",
+        "state": {
+          "branch": null,
+          "revision": "1f74844f77f79b95c0bb0130b3a87d4f340e6d3a",
+          "version": "3.3.0"
+        }
+      },
       {
         "package": "FLAnimatedImage",
         "repositoryURL": "https://github.com/Flipboard/FLAnimatedImage.git",
@@ -96,8 +105,8 @@
         "repositoryURL": "https://github.com/TwidereProject/MetaTextKit.git",
         "state": {
           "branch": null,
-          "revision": "3ea336d3de7938dc112084c596a646e697b0feee",
+          "revision": "2b9556a78b2986b8c0b04adc6da8ec206b448a0c",
-          "version": "2.2.1"
+          "version": "2.2.3"
         }
       },
       {
@@ -105,8 +114,8 @@
         "repositoryURL": "https://github.com/kean/Nuke.git",
         "state": {
           "branch": null,
-          "revision": "0db18dd34998cca18e9a28bcee136f84518007a0",
+          "revision": "0ea7545b5c918285aacc044dc75048625c8257cc",
-          "version": "10.4.1"
+          "version": "10.8.0"
         }
       },
       {
@@ -141,8 +150,8 @@
         "repositoryURL": "https://github.com/SDWebImage/SDWebImage.git",
         "state": {
           "branch": null,
-          "revision": "2c53f531f1bedd253f55d85105409c28ed4a922c",
+          "revision": "2e63d0061da449ad0ed130768d05dceb1496de44",
-          "version": "5.12.3"
+          "version": "5.12.5"
         }
       },
       {
@@ -172,13 +181,22 @@
           "version": "1.0.0"
         }
       },
+      {
+        "package": "SwiftSoup",
+        "repositoryURL": "https://github.com/scinfu/SwiftSoup.git",
+        "state": {
+          "branch": null,
+          "revision": "41e7c263fb8c277e980ebcb9b0b5f6031d3d4886",
+          "version": "2.4.2"
+        }
+      },
       {
         "package": "Introspect",
         "repositoryURL": "https://github.com/siteline/SwiftUI-Introspect.git",
         "state": {
           "branch": null,
-          "revision": "2e09be8af614401bc9f87d40093ec19ce56ccaf2",
+          "revision": "f2616860a41f9d9932da412a8978fec79c06fe24",
-          "version": "0.1.3"
+          "version": "0.1.4"
         }
       },
       {

Mastodon/Coordinator/SceneCoordinator.swift

@@ -144,7 +144,7 @@ extension SceneCoordinator {
         case popover(sourceView: UIView)
         case panModal
         case custom(transitioningDelegate: UIViewControllerTransitioningDelegate)
-        case customPush
+        case customPush(animated: Bool)
         case safariPresent(animated: Bool, completion: (() -> Void)? = nil)
         case alertController(animated: Bool, completion: (() -> Void)? = nil)
         case activityViewControllerPresent(animated: Bool, completion: (() -> Void)? = nil)
@@ -158,7 +158,7 @@ extension SceneCoordinator {
         case mastodonServerRules(viewModel: MastodonServerRulesViewModel)
         case mastodonConfirmEmail(viewModel: MastodonConfirmEmailViewModel)
         case mastodonResendEmail(viewModel: MastodonResendEmailViewModel)
-        case mastodonWebView(viewModel:WebViewModel)
+        case mastodonWebView(viewModel: WebViewModel)
 
         // search
         case searchDetail(viewModel: SearchDetailViewModel)
@@ -184,6 +184,8 @@ extension SceneCoordinator {
         
         // report
         case report(viewModel: ReportViewModel)
+        case reportServerRules(viewModel: ReportServerRulesViewModel)
+        case reportStatus(viewModel: ReportStatusViewModel)
         case reportSupplementary(viewModel: ReportSupplementaryViewModel)
         case reportResult(viewModel: ReportResultViewModel)
 
@@ -309,7 +311,7 @@ extension SceneCoordinator {
                 if scene.isOnboarding {
                     return OnboardingNavigationController(rootViewController: viewController)
                 } else {
-                    return UINavigationController(rootViewController: viewController)
+                    return AdaptiveStatusBarStyleNavigationController(rootViewController: viewController)
                 }
             }()
             modalNavigationController.modalPresentationCapturesStatusBarAppearance = true
@@ -339,10 +341,10 @@ extension SceneCoordinator {
             viewController.transitioningDelegate = transitioningDelegate
             (splitViewController ?? presentingViewController)?.present(viewController, animated: true, completion: nil)
             
-        case .customPush:
+        case .customPush(let animated):
             // set delegate in view controller
             assert(sender?.navigationController?.delegate != nil)
-            sender?.navigationController?.pushViewController(viewController, animated: true)
+            sender?.navigationController?.pushViewController(viewController, animated: animated)
             
         case .safariPresent(let animated, let completion):
             if UserDefaults.shared.preferredUsingDefaultBrowser, case let .safari(url) = scene {
@@ -368,10 +370,10 @@ extension SceneCoordinator {
         splitViewController?.contentSplitViewController.currentSupplementaryTab = tab
         
         splitViewController?.compactMainTabBarViewController.selectedIndex = tab.rawValue
-        splitViewController?.compactMainTabBarViewController.currentTab.value = tab
+        splitViewController?.compactMainTabBarViewController.currentTab = tab
         
         tabBarController.selectedIndex = tab.rawValue
-        tabBarController.currentTab.value = tab
+        tabBarController.currentTab = tab
     }
 }
 
@@ -447,6 +449,14 @@ private extension SceneCoordinator {
             let _viewController = ReportViewController()
             _viewController.viewModel = viewModel
             viewController = _viewController
+        case .reportServerRules(let viewModel):
+            let _viewController = ReportServerRulesViewController()
+            _viewController.viewModel = viewModel
+            viewController = _viewController
+        case .reportStatus(let viewModel):
+            let _viewController = ReportStatusViewController()
+            _viewController.viewModel = viewModel
+            viewController = _viewController
         case .reportSupplementary(let viewModel):
             let _viewController = ReportSupplementaryViewController()
             _viewController.viewModel = viewModel

Mastodon/Diffiable/Discovery/DiscoveryItem.swift

@@ -0,0 +1,17 @@
+//
+//  DiscoveryItem.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import Foundation
+import MastodonSDK
+import CoreDataStack
+
+enum DiscoveryItem: Hashable {
+    case hashtag(Mastodon.Entity.Tag)
+    case link(Mastodon.Entity.Link)
+    case user(ManagedObjectRecord<MastodonUser>)
+    case bottomLoader
+}

Mastodon/Diffiable/Discovery/DiscoverySection.swift

@@ -0,0 +1,74 @@
+//
+//  DiscoverySection.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import os.log
+import UIKit
+import MastodonUI
+
+enum DiscoverySection: CaseIterable {
+    // case posts
+    case hashtags
+    case news
+    case forYou
+}
+
+extension DiscoverySection {
+    
+    static let logger = Logger(subsystem: "DiscoverySection", category: "logic")
+    
+    class Configuration {
+        weak var profileCardTableViewCellDelegate: ProfileCardTableViewCellDelegate?
+        
+        public init(profileCardTableViewCellDelegate: ProfileCardTableViewCellDelegate? = nil) {
+            self.profileCardTableViewCellDelegate = profileCardTableViewCellDelegate
+        }
+    }
+    
+    static func diffableDataSource(
+        tableView: UITableView,
+        context: AppContext,
+        configuration: Configuration
+    ) -> UITableViewDiffableDataSource<DiscoverySection, DiscoveryItem> {
+        tableView.register(TrendTableViewCell.self, forCellReuseIdentifier: String(describing: TrendTableViewCell.self))
+        tableView.register(NewsTableViewCell.self, forCellReuseIdentifier: String(describing: NewsTableViewCell.self))
+        tableView.register(ProfileCardTableViewCell.self, forCellReuseIdentifier: String(describing: ProfileCardTableViewCell.self))
+        tableView.register(TimelineBottomLoaderTableViewCell.self, forCellReuseIdentifier: String(describing: TimelineBottomLoaderTableViewCell.self))
+
+        return UITableViewDiffableDataSource(tableView: tableView) { tableView, indexPath, item in
+            switch item {
+            case .hashtag(let tag):
+                let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: TrendTableViewCell.self), for: indexPath) as! TrendTableViewCell
+                cell.trendView.configure(tag: tag)
+                return cell
+            case .link(let link):
+                let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: NewsTableViewCell.self), for: indexPath) as! NewsTableViewCell
+                cell.newsView.configure(link: link)
+                return cell
+            case .user(let record):
+                let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: ProfileCardTableViewCell.self), for: indexPath) as! ProfileCardTableViewCell
+                context.managedObjectContext.performAndWait {
+                    guard let user = record.object(in: context.managedObjectContext) else { return }
+                    cell.configure(
+                        tableView: tableView,
+                        user: user,
+                        profileCardTableViewCellDelegate: configuration.profileCardTableViewCellDelegate
+                    )
+                }
+                context.authenticationService.activeMastodonAuthentication
+                    .map { $0?.user }
+                    .assign(to: \.me, on: cell.profileCardView.viewModel.relationshipViewModel)
+                    .store(in: &cell.disposeBag)
+                return cell
+            case .bottomLoader:
+                let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: TimelineBottomLoaderTableViewCell.self), for: indexPath) as! TimelineBottomLoaderTableViewCell
+                cell.activityIndicatorView.startAnimating()
+                return cell
+            }
+        }
+    }
+    
+}

Mastodon/Diffiable/Onboarding/PickServerSection.swift

@@ -29,7 +29,7 @@ extension PickServerSection {
             weak dependency,
             weak pickServerCellDelegate
         ] tableView, indexPath, item -> UITableViewCell? in
-            guard let dependency = dependency else { return nil }
+            guard let _ = dependency else { return nil }
             switch item {
             case .header:
                 let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: OnboardingHeadlineTableViewCell.self), for: indexPath) as! OnboardingHeadlineTableViewCell

Mastodon/Diffiable/Search/SearchHistorySection.swift

@@ -69,10 +69,10 @@ extension SearchHistorySection {
         let trendHeaderRegister = UICollectionView.SupplementaryRegistration<SearchHistorySectionHeaderCollectionReusableView>(elementKind: UICollectionView.elementKindSectionHeader) { [weak dataSource] supplementaryView, elementKind, indexPath in
             supplementaryView.delegate = configuration.searchHistorySectionHeaderCollectionReusableViewDelegate
 
-            guard let dataSource = dataSource else { return }
+            guard let _ = dataSource else { return }
-            let sections = dataSource.snapshot().sectionIdentifiers
+            // let sections = dataSource.snapshot().sectionIdentifiers
-            guard indexPath.section < sections.count else { return }
+            // guard indexPath.section < sections.count else { return }
-            let section = sections[indexPath.section]
+            // let section = sections[indexPath.section]
         }
         
         dataSource.supplementaryViewProvider = { (collectionView: UICollectionView, elementKind: String, indexPath: IndexPath) in

Mastodon/Diffiable/Search/SearchSection.swift

@@ -21,26 +21,7 @@ extension SearchSection {
     ) -> UICollectionViewDiffableDataSource<SearchSection, SearchItem> {
         
         let trendCellRegister = UICollectionView.CellRegistration<TrendCollectionViewCell, Mastodon.Entity.Tag> { cell, indexPath, item in
-            let primaryLabelText = "#" + item.name
-            let secondaryLabelText = L10n.Scene.Search.Recommend.HashTag.peopleTalking(item.talkingPeopleCount ?? 0)
             
-            cell.primaryLabel.text = primaryLabelText
-            cell.secondaryLabel.text = secondaryLabelText
-            
-            cell.lineChartView.data = (item.history ?? [])
-                .sorted(by: { $0.day < $1.day })        // latest last
-                .map { entry in
-                    guard let point = Int(entry.accounts) else {
-                        return .zero
-                    }
-                    return CGFloat(point)
-                }
-            
-            cell.isAccessibilityElement = true
-            cell.accessibilityLabel = [
-                primaryLabelText,
-                secondaryLabelText
-            ].joined(separator: ", ")
         }
         
         let dataSource = UICollectionViewDiffableDataSource<SearchSection, SearchItem>(

Mastodon/Diffiable/Settings/SettingsSection.swift

@@ -51,7 +51,7 @@ extension SettingsSection {
                 }
                 cell.delegate = settingsAppearanceTableViewCellDelegate
                 return cell
-            case .appearancePreference(let record, let appearanceType):
+            case .appearancePreference(let record, _):
                 let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: SettingsToggleTableViewCell.self), for: indexPath) as! SettingsToggleTableViewCell
                 cell.delegate = settingsToggleCellDelegate
                 managedObjectContext.performAndWait {

Mastodon/Extension/CoreDataStack/MastodonUser.swift

@@ -9,53 +9,6 @@ import Foundation
 import CoreDataStack
 import MastodonSDK
 
-extension MastodonUser {
-
-    public var displayNameWithFallback: String {
-        return !displayName.isEmpty ? displayName : username
-    }
-
-    public var acctWithDomain: String {
-        if !acct.contains("@") {
-            // Safe concat due to username cannot contains "@"
-            return username + "@" + domain
-        } else {
-            return acct
-        }
-    }
-
-    public var domainFromAcct: String {
-        if !acct.contains("@") {
-            return domain
-        } else {
-            let domain = acct.split(separator: "@").last
-            return String(domain!)
-        }
-    }
-
-}
-
-extension MastodonUser {
-
-    public func headerImageURL() -> URL? {
-        return URL(string: header)
-    }
-
-    public func headerImageURLWithFallback(domain: String) -> URL {
-        return URL(string: header) ?? URL(string: "https://\(domain)/headers/original/missing.png")!
-    }
-
-    public func avatarImageURL() -> URL? {
-        let string = UserDefaults.shared.preferredStaticAvatar ? avatarStatic ?? avatar : avatar
-        return URL(string: string)
-    }
-
-    public func avatarImageURLWithFallback(domain: String) -> URL {
-        return avatarImageURL() ?? URL(string: "https://\(domain)/avatars/original/missing.png")!
-    }
-
-}
-
 extension MastodonUser {
 
     public var profileURL: URL {

Mastodon/Extension/MastodonSDK/Mastodon+Entity+Tag.swift

@@ -7,24 +7,12 @@
 
 import MastodonSDK
 
-extension Mastodon.Entity.Tag: Hashable {
+//extension Mastodon.Entity.Tag: Hashable {
-    public func hash(into hasher: inout Hasher) {
+//    public func hash(into hasher: inout Hasher) {
-        hasher.combine(name)
+//        hasher.combine(name)
-    }
+//    }
-    
+//    
-    public static func == (lhs: Mastodon.Entity.Tag, rhs: Mastodon.Entity.Tag) -> Bool {
+//    public static func == (lhs: Mastodon.Entity.Tag, rhs: Mastodon.Entity.Tag) -> Bool {
-        return lhs.name == rhs.name
+//        return lhs.name == rhs.name
-    }
+//    }
-}
+//}
-
-extension Mastodon.Entity.Tag {
-    
-    /// the sum of recent 2 days
-    public var talkingPeopleCount: Int? {
-        return history?
-            .prefix(2)
-            .compactMap { Int($0.accounts) }
-            .reduce(0, +)
-    }
-    
-}

Mastodon/Extension/MastodonUI/ThemeService.swift

@@ -1,11 +1,13 @@
 //
-//  ThemeService+Appearance.swift
+//  ThemeService.swift
 //  Mastodon
 //
-//  Created by MainasuK Cirno on 2021-7-19.
+//  Created by MainasuK on 2022-4-13.
 //
 
 import UIKit
+import MastodonCommon
+import MastodonUI
 
 extension ThemeService {
     func set(themeName: ThemeName) {

Mastodon/Extension/UINavigationController.swift

@@ -1,16 +0,0 @@
-//
-//  UINavigationController.swift
-//  Mastodon
-//
-//  Created by MainasuK Cirno on 2021-3-31.
-//
-
-import UIKit
-
-// This not works!
-// SeeAlso: `AdaptiveStatusBarStyleNavigationController`
-extension UINavigationController {
-    open override var childForStatusBarStyle: UIViewController? {
-        return visibleViewController
-    }
-}

Mastodon/Extension/UIView.swift

@@ -1,70 +0,0 @@
-//
-//  UIView.swift
-//  Mastodon
-//
-//  Created by sxiaojian on 2021/2/4.
-//
-
-import UIKit
-
-// MARK: - Convenience view creation method
-extension UIView {
-
-    static let separatorColor: UIColor = {
-        UIColor(dynamicProvider: { collection in
-            switch collection.userInterfaceStyle {
-            case .dark:
-                return ThemeService.shared.currentTheme.value.separator
-            default:
-                return .separator
-            }
-        })
-    }()
-    
-    static var separatorLine: UIView {
-        let line = UIView()
-        line.backgroundColor = UIView.separatorColor
-        return line
-    }
-    
-    static func separatorLineHeight(of view: UIView) -> CGFloat {
-        return 1.0 / view.traitCollection.displayScale
-    }
-    
-}
-
-// MARK: - Convenience view appearance modification method
-extension UIView {
-    @discardableResult
-    func applyCornerRadius(radius: CGFloat) -> Self {
-        layer.masksToBounds = true
-        layer.cornerRadius = radius
-        layer.cornerCurve = .continuous
-        return self
-    }
-    
-    @discardableResult
-    func applyShadow(
-        color: UIColor,
-        alpha: Float,
-        x: CGFloat,
-        y: CGFloat,
-        blur: CGFloat,
-        spread: CGFloat = 0) -> Self
-    {
-        layer.masksToBounds = false
-        layer.shadowColor = color.cgColor
-        layer.shadowOpacity = alpha
-        layer.shadowOffset = CGSize(width: x, height: y)
-        layer.shadowRadius = blur / 2.0
-        if spread == 0 {
-            layer.shadowPath = nil
-        } else {
-            let dx = -spread
-            let rect = bounds.insetBy(dx: dx, dy: dx)
-            layer.shadowPath = UIBezierPath(rect: rect).cgPath
-        }
-        return self
-    }
-}
-

Mastodon/Generated/AutoGenerateTableViewDelegate.generated.swift

@@ -1,14 +1,7 @@
 // Generated using Sourcery 1.6.1 — https://github.com/krzysztofzablocki/Sourcery
 // DO NOT EDIT
 
-
+// sourcery:inline:DiscoveryCommunityViewController.AutoGenerateTableViewDelegate
-
-
-
-
-
-
-// sourcery:inline:UserTimelineViewController.AutoGenerateTableViewDelegate
 
 // Generated using Sourcery
 // DO NOT EDIT
@@ -33,3 +26,13 @@ func tableView(_ tableView: UITableView, willPerformPreviewActionForMenuWith con
 }
 // sourcery:end
 
+
+
+
+
+
+
+
+
+
+

Mastodon/Info.plist

@@ -30,7 +30,7 @@
 	<key>CFBundlePackageType</key>
 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.3.0</string>
+	<string>1.4.2</string>
 	<key>CFBundleURLTypes</key>
 	<array>
 		<dict>
@@ -43,7 +43,7 @@
 		</dict>
 	</array>
 	<key>CFBundleVersion</key>
-	<string>109</string>
+	<string>127</string>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
 	<key>LSApplicationQueriesSchemes</key>

Mastodon/Persistence/Extension/MastodonEmoji.swift

@@ -22,13 +22,3 @@ extension MastodonEmoji {
         )
     }
 }
-
-extension Collection where Element == MastodonEmoji {
-    public var asDictionary: MastodonContent.Emojis {
-        var dictionary: MastodonContent.Emojis = [:]
-        for emoji in self {
-            dictionary[emoji.code] = emoji.url
-        }
-        return dictionary
-    }
-}

Mastodon/Preference/ThemePreference.swift

@@ -5,17 +5,3 @@
 //  Created by MainasuK Cirno on 2021-7-5.
 //
 
-import UIKit
-import MastodonExtension
-
-extension UserDefaults {
-
-    @objc dynamic var currentThemeNameRawValue: String {
-        get {
-            register(defaults: [#function: ThemeName.mastodon.rawValue])
-            return string(forKey: #function) ?? ThemeName.mastodon.rawValue
-        }
-        set { self[#function] = newValue }
-    }
-
-}

Mastodon/Protocol/PageboyNavigateable.swift

@@ -0,0 +1,92 @@
+//
+//  PageboyNavigateable.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-5-11.
+//
+
+import UIKit
+import Pageboy
+import MastodonLocalization
+
+typealias PageboyNavigateable = PageboyNavigateableCore & PageboyNavigateableRelay
+
+protocol PageboyNavigateableCore: AnyObject {
+    var navigateablePageViewController: PageboyViewController { get }
+    var pageboyNavigateKeyCommands: [UIKeyCommand] { get }
+
+    func pageboyNavigateKeyCommandHandler(_ sender: UIKeyCommand)
+    func navigate(direction: PageboyNavigationDirection)
+}
+
+@objc protocol PageboyNavigateableRelay: AnyObject {
+    func pageboyNavigateKeyCommandHandlerRelay(_ sender: UIKeyCommand)
+}
+
+enum PageboyNavigationDirection: String, CaseIterable {
+    case previous
+    case next
+
+    var title: String {
+        switch self {
+        case .previous:             return L10n.Common.Controls.Keyboard.SegmentedControl.previousSection
+        case .next:                 return L10n.Common.Controls.Keyboard.SegmentedControl.nextSection
+        }
+    }
+    
+    // UIKeyCommand input
+    var input: String {
+        switch self {
+        case .previous:             return "["
+        case .next:                 return "]"
+        }
+    }
+    
+    var modifierFlags: UIKeyModifierFlags {
+        switch self {
+        case .previous:             return [.shift, .command]
+        case .next:                 return [.shift, .command]
+        }
+    }
+    
+    var propertyList: Any {
+        return rawValue
+    }
+}
+
+extension PageboyNavigateableCore where Self: PageboyNavigateableRelay {
+    var pageboyNavigateKeyCommands: [UIKeyCommand] {
+        PageboyNavigationDirection.allCases.map { direction in
+            UIKeyCommand(
+                title: direction.title,
+                image: nil,
+                action: #selector(Self.pageboyNavigateKeyCommandHandlerRelay(_:)),
+                input: direction.input,
+                modifierFlags: direction.modifierFlags,
+                propertyList: direction.propertyList,
+                alternates: [],
+                discoverabilityTitle: nil,
+                attributes: [],
+                state: .off
+            )
+        }
+    }
+    
+    func pageboyNavigateKeyCommandHandler(_ sender: UIKeyCommand) {
+        guard let rawValue = sender.propertyList as? String,
+              let direction = PageboyNavigationDirection(rawValue: rawValue) else { return }
+        navigate(direction: direction)
+    }
+
+}
+
+extension PageboyNavigateableCore {
+    func navigate(direction: PageboyNavigationDirection) {
+        switch direction {
+        case .previous:
+            navigateablePageViewController.scrollToPage(.previous, animated: true)
+        case .next:
+            navigateablePageViewController.scrollToPage(.next, animated: true)
+        }
+    }
+}

Mastodon/Protocol/Provider/DataSourceFacade+Meta.swift

@@ -38,11 +38,15 @@ extension DataSourceFacade {
         meta: Meta
     ) async {
         switch meta {
+        // note:
+        // some server mark the normal url as "u-url" class. highlighted content is a URL
         case .url(_, _, let url, _),
              .mention(_, let url, _) where url.lowercased().hasPrefix("http"):
-            // note:
+            // fix non-ascii character URL link can not open issue
-            // some server mark the normal url as "u-url" class. highlighted content is a URL
+            guard let url = URL(string: url) ?? URL(string: url.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? url) else {
-            guard let url = URL(string: url) else { return }
+                assertionFailure()
+                return
+            }
             if let domain = provider.context.authenticationService.activeMastodonAuthenticationBox.value?.domain, url.host == domain,
                url.pathComponents.count >= 4,
                url.pathComponents[0] == "/",

Mastodon/Protocol/Provider/DataSourceFacade+Profile.swift

@@ -122,12 +122,12 @@ extension DataSourceFacade {
         let barButtonItem: UIBarButtonItem?
     }
     
-    @MainActor
+//    @MainActor
-    static func createProfileActionMenu(
+//    static func createProfileActionMenu(
-        dependency: NeedsDependency,
+//        dependency: NeedsDependency,
-        user: ManagedObjectRecord<MastodonUser>
+//        user: ManagedObjectRecord<MastodonUser>
-    ) -> UIMenu {
+//    ) -> UIMenu {
-        var children: [UIMenuElement] = []
+//        var children: [UIMenuElement] = []
 //        let name = mastodonUser.displayNameWithFallback
 //
 //        if let shareUser = shareUser {
@@ -339,9 +339,9 @@ extension DataSourceFacade {
 //            }
 //            children.append(deleteAction)
 //        }
-        
+//        
-        return UIMenu(title: "", options: [], children: children)
+//        return UIMenu(title: "", options: [], children: children)
-    }
+//    }
     
     static func createActivityViewController(
         dependency: NeedsDependency,

Mastodon/Protocol/Provider/DataSourceFacade+SearchHistory.swift

@@ -99,7 +99,7 @@ extension DataSourceFacade {
         
         try await managedObjectContext.performChanges {
             guard let authenticationBox = _authenticationBox else { return }
-            guard let me = authenticationBox.authenticationRecord.object(in: managedObjectContext)?.user else { return }
+            guard let _ = authenticationBox.authenticationRecord.object(in: managedObjectContext)?.user else { return }
             let request = SearchHistory.sortedFetchRequest
             request.predicate = SearchHistory.predicate(
                 domain: authenticationBox.domain,

Mastodon/Protocol/Provider/DataSourceFacade+Status.swift

@@ -286,24 +286,8 @@ extension DataSourceFacade {
         try await dependency.context.managedObjectContext.perform {
             guard let _status = status.object(in: dependency.context.managedObjectContext) else { return }
             let status = _status.reblog ?? _status
-            
+            status.update(isSensitiveToggled: !status.isSensitiveToggled)
-            let allToggled = status.isContentSensitiveToggled && status.isMediaSensitiveToggled
-            
-            status.update(isContentSensitiveToggled: !allToggled)
-            status.update(isMediaSensitiveToggled: !allToggled)
         }
     }
     
-//    static func responseToToggleMediaSensitiveAction(
-//        dependency: NeedsDependency,
-//        status: ManagedObjectRecord<Status>
-//    ) async throws {
-//        try await dependency.context.managedObjectContext.perform {
-//            guard let _status = status.object(in: dependency.context.managedObjectContext) else { return }
-//            let status = _status.reblog ?? _status
-//            
-//            status.update(isMediaSensitiveToggled: !status.isMediaSensitiveToggled)
-//        }
-//    }
-    
 }

Mastodon/Protocol/Provider/DataSourceProvider+NotificationTableViewCellDelegate.swift

@@ -135,7 +135,7 @@ extension NotificationTableViewCellDelegate where Self: DataSourceProvider & Med
                 let status = _status.reblog ?? _status
                 return NotificationMediaTransitionContext(
                     status: .init(objectID: status.objectID),
-                    needsToggleMediaSensitive: status.isMediaSensitiveToggled ? !status.sensitive : status.sensitive
+                    needsToggleMediaSensitive: status.isSensitiveToggled ? !status.sensitive : status.sensitive
                 )
             }
 
@@ -187,7 +187,7 @@ extension NotificationTableViewCellDelegate where Self: DataSourceProvider & Med
                 let status = _status.reblog ?? _status
                 return NotificationMediaTransitionContext(
                     status: .init(objectID: status.objectID),
-                    needsToggleMediaSensitive: status.isMediaSensitiveToggled ? !status.sensitive : status.sensitive
+                    needsToggleMediaSensitive: status.isMediaSensitive ? !status.isSensitiveToggled : false
                 )
             }
 
@@ -486,7 +486,7 @@ extension NotificationTableViewCellDelegate where Self: DataSourceProvider {
                     provider: self,
                     user: user
                 )
-            case .notification(let notification):
+            case .notification:
                 assertionFailure("TODO")
             default:
                 assertionFailure("TODO")

Mastodon/Protocol/Provider/DataSourceProvider+StatusTableViewCellDelegate.swift

@@ -143,12 +143,7 @@ extension StatusTableViewCellDelegate where Self: DataSourceProvider & MediaPrev
                 return
             }
             
-            let managedObjectContext = self.context.managedObjectContext
+            let needsToggleMediaSensitive = await !statusView.viewModel.isMediaReveal
-            let needsToggleMediaSensitive: Bool = try await managedObjectContext.perform {
-                guard let _status = status.object(in: managedObjectContext) else { return false }
-                let status = _status.reblog ?? _status
-                return status.isMediaSensitiveToggled ? !status.sensitive : status.sensitive
-            }
             
             guard !needsToggleMediaSensitive else {
                 try await DataSourceFacade.responseToToggleSensitiveAction(
@@ -499,7 +494,7 @@ extension StatusTableViewCellDelegate where Self: DataSourceProvider {
                     provider: self,
                     user: user
                 )
-            case .notification(let notification):
+            case .notification:
                 assertionFailure("TODO")
             default:
                 assertionFailure("TODO")

Mastodon/Protocol/Provider/DataSourceProvider+StatusTableViewControllerNavigateable.swift

@@ -115,7 +115,7 @@ extension StatusTableViewControllerNavigateableCore where Self: DataSourceProvid
 
         guard let provider = self as? (DataSourceProvider & MediaPreviewableViewController) else { return }
         guard let indexPathForSelectedRow = tableView.indexPathForSelectedRow,
-              let cell = tableView.cellForRow(at: indexPathForSelectedRow) as? StatusTableViewCell
+              let cell = tableView.cellForRow(at: indexPathForSelectedRow) as? StatusViewContainerTableViewCell
         else { return }
 
         guard let mediaView = cell.statusView.mediaGridContainerView.mediaViews.first else { return }

Mastodon/Protocol/Provider/DataSourceProvider+TableViewControllerNavigateable.swift

@@ -138,7 +138,7 @@ extension TableViewControllerNavigateableCore where Self: DataSourceProvider {
                     target: .status,
                     status: record
                 )
-            case .notification(let record):
+            case .notification:
                 assertionFailure()
             default:
                 assertionFailure()

Mastodon/Protocol/Provider/DataSourceProvider+UITableViewDelegate.swift

@@ -93,7 +93,7 @@ extension UITableViewDelegate where Self: DataSourceProvider & MediaPreviewableV
             guard let image = mediaView.thumbnail(),
                   let assetURLString = mediaView.configuration?.assetURL,
                   let assetURL = URL(string: assetURLString),
-                  let resourceType = mediaView.configuration?.resourceType
+                  let _ = mediaView.configuration?.resourceType
             else {
                 // not provide preview unless thumbnail ready
                 return nil

Mastodon/Resources/ckb.lproj/InfoPlist.strings

@@ -0,0 +1,4 @@
+"NSCameraUsageDescription" = "Used to take photo for post status";
+"NSPhotoLibraryAddUsageDescription" = "Used to save photo into the Photo Library";
+"NewPostShortcutItemTitle" = "New Post";
+"SearchShortcutItemTitle" = "Search";

Mastodon/Resources/gl.lproj/InfoPlist.strings

@@ -0,0 +1,4 @@
+"NSCameraUsageDescription" = "Used to take photo for post status";
+"NSPhotoLibraryAddUsageDescription" = "Used to save photo into the Photo Library";
+"NewPostShortcutItemTitle" = "New Post";
+"SearchShortcutItemTitle" = "Search";

Mastodon/Resources/it.lproj/InfoPlist.strings

@@ -0,0 +1,4 @@
+"NSCameraUsageDescription" = "Used to take photo for post status";
+"NSPhotoLibraryAddUsageDescription" = "Used to save photo into the Photo Library";
+"NewPostShortcutItemTitle" = "New Post";
+"SearchShortcutItemTitle" = "Search";

Mastodon/Resources/sv.lproj/InfoPlist.strings

@@ -0,0 +1,4 @@
+"NSCameraUsageDescription" = "Used to take photo for post status";
+"NSPhotoLibraryAddUsageDescription" = "Used to save photo into the Photo Library";
+"NewPostShortcutItemTitle" = "New Post";
+"SearchShortcutItemTitle" = "Search";

Mastodon/Resources/tr.lproj/InfoPlist.strings

@@ -0,0 +1,4 @@
+"NSCameraUsageDescription" = "Used to take photo for post status";
+"NSPhotoLibraryAddUsageDescription" = "Used to save photo into the Photo Library";
+"NewPostShortcutItemTitle" = "New Post";
+"SearchShortcutItemTitle" = "Search";

Mastodon/Resources/zh-Hant.lproj/InfoPlist.strings

@@ -0,0 +1,4 @@
+"NSCameraUsageDescription" = "Used to take photo for post status";
+"NSPhotoLibraryAddUsageDescription" = "Used to save photo into the Photo Library";
+"NewPostShortcutItemTitle" = "New Post";
+"SearchShortcutItemTitle" = "Search";

Mastodon/Scene/Account/AccountViewController.swift

@@ -118,7 +118,7 @@ extension AccountListViewController {
                 
                 // the presentingViewController may deinit.
                 // Hold it and check the window to prevent PanModel crash
-                guard let presentingViewController = presentingViewController else { return }
+                guard let _ = presentingViewController else { return }
                 guard self.view.window != nil else { return }
                 
                 self.hasLoaded = true

Mastodon/Scene/Compose/AutoComplete/AutoCompleteViewModel+State.swift

@@ -77,7 +77,7 @@ extension AutoCompleteViewModel.State {
         
         override func didEnter(from previousState: GKState?) {
             super.didEnter(from: previousState)
-            guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
+            guard let viewModel = viewModel, let _ = stateMachine else { return }
 
             let searchText = viewModel.inputText.value
             let searchType = AutoCompleteViewModel.SearchType(inputText: searchText) ?? .default

Mastodon/Scene/Compose/CollectionViewCell/ComposeStatusPollOptionCollectionViewCell.swift

@@ -10,6 +10,7 @@ import UIKit
 import Combine
 import MastodonAsset
 import MastodonLocalization
+import MastodonUI
 
 protocol ComposeStatusPollOptionCollectionViewCellDelegate: AnyObject {
     func composeStatusPollOptionCollectionViewCell(_ cell: ComposeStatusPollOptionCollectionViewCell, textFieldDidBeginEditing textField: UITextField)

Mastodon/Scene/Discovery/Community/CommunityViewViewModel.swift

@@ -0,0 +1,64 @@
+//
+//  DiscoveryCommunityViewViewModel.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-29.
+//
+
+import os.log
+import UIKit
+import Combine
+import GameplayKit
+import CoreData
+import CoreDataStack
+import MastodonSDK
+
+final class DiscoveryCommunityViewViewModel {
+    
+    let logger = Logger(subsystem: "DiscoveryCommunityViewViewModel", category: "ViewModel")
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    let viewDidAppeared = PassthroughSubject<Void, Never>()
+    let statusFetchedResultsController: StatusFetchedResultsController
+
+    // output
+    var diffableDataSource: UITableViewDiffableDataSource<StatusSection, StatusItem>?
+    private(set) lazy var stateMachine: GKStateMachine = {
+        let stateMachine = GKStateMachine(states: [
+            State.Initial(viewModel: self),
+            State.Reloading(viewModel: self),
+            State.Fail(viewModel: self),
+            State.Idle(viewModel: self),
+            State.Loading(viewModel: self),
+            State.NoMore(viewModel: self),
+        ])
+        stateMachine.enter(State.Initial.self)
+        return stateMachine
+    }()
+    
+    let didLoadLatest = PassthroughSubject<Void, Never>()
+    
+    init(context: AppContext) {
+        self.context = context
+        self.statusFetchedResultsController = StatusFetchedResultsController(
+            managedObjectContext: context.managedObjectContext,
+            domain: nil,
+            additionalTweetPredicate: nil
+        )
+        // end init
+        
+        context.authenticationService.activeMastodonAuthentication
+            .map { $0?.domain }
+            .assign(to: \.value, on: statusFetchedResultsController.domain)
+            .store(in: &disposeBag)
+    
+    }
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}

Mastodon/Scene/Discovery/Community/DiscoveryCommunityViewController+DataSourceProvider.swift

@@ -0,0 +1,34 @@
+//
+//  DiscoveryCommunityViewController+DataSourceProvider.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-29.
+//
+
+import UIKit
+
+extension DiscoveryCommunityViewController: DataSourceProvider {
+    func item(from source: DataSourceItem.Source) async -> DataSourceItem? {
+        var _indexPath = source.indexPath
+        if _indexPath == nil, let cell = source.tableViewCell {
+            _indexPath = await self.indexPath(for: cell)
+        }
+        guard let indexPath = _indexPath else { return nil }
+        
+        guard let item = viewModel.diffableDataSource?.itemIdentifier(for: indexPath) else {
+            return nil
+        }
+        
+        switch item {
+        case .status(let record):
+            return .status(record: record)
+        default:
+            return nil
+        }
+    }
+    
+    @MainActor
+    private func indexPath(for cell: UITableViewCell) async -> IndexPath? {
+        return tableView.indexPath(for: cell)
+    }
+}

Mastodon/Scene/Discovery/Community/DiscoveryCommunityViewController.swift

@@ -0,0 +1,171 @@
+//
+//  DiscoveryCommunityViewController.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-29.
+//
+
+import os.log
+import UIKit
+import Combine
+import MastodonUI
+
+// Local Timeline
+final class DiscoveryCommunityViewController: UIViewController, NeedsDependency, MediaPreviewableViewController {
+    
+    let logger = Logger(subsystem: "DiscoveryCommunityViewController", category: "ViewController")
+    
+    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
+    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
+    
+    var disposeBag = Set<AnyCancellable>()
+    var viewModel: DiscoveryCommunityViewModel!
+    
+    let mediaPreviewTransitionController = MediaPreviewTransitionController()
+
+    lazy var tableView: UITableView = {
+        let tableView = UITableView()
+        tableView.rowHeight = UITableView.automaticDimension
+        tableView.estimatedRowHeight = 100
+        tableView.separatorStyle = .none
+        tableView.backgroundColor = .clear
+        return tableView
+    }()
+    
+    let refreshControl = UIRefreshControl()
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension DiscoveryCommunityViewController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        view.backgroundColor = ThemeService.shared.currentTheme.value.secondarySystemBackgroundColor
+        ThemeService.shared.currentTheme
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] theme in
+                guard let self = self else { return }
+                self.view.backgroundColor = theme.secondarySystemBackgroundColor
+            }
+            .store(in: &disposeBag)
+        
+        tableView.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(tableView)
+        NSLayoutConstraint.activate([
+            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+        
+        tableView.refreshControl = refreshControl
+        refreshControl.addTarget(self, action: #selector(DiscoveryCommunityViewController.refreshControlValueChanged(_:)), for: .valueChanged)
+        viewModel.didLoadLatest
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.refreshControl.endRefreshing()
+            }
+            .store(in: &disposeBag)
+
+        tableView.delegate = self
+        viewModel.setupDiffableDataSource(
+            tableView: tableView,
+            statusTableViewCellDelegate: self
+        )
+        
+        // setup batch fetch
+        viewModel.listBatchFetchViewModel.setup(scrollView: tableView)
+        viewModel.listBatchFetchViewModel.shouldFetch
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                guard self.view.window != nil else { return }
+                self.viewModel.stateMachine.enter(DiscoveryCommunityViewModel.State.Loading.self)
+            }
+            .store(in: &disposeBag)
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        tableView.deselectRow(with: transitionCoordinator, animated: animated)
+    }
+    
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        
+        viewModel.viewDidAppeared.send()
+    }
+    
+}
+
+extension DiscoveryCommunityViewController {
+    
+    @objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
+        if !viewModel.stateMachine.enter(DiscoveryCommunityViewModel.State.Reloading.self) {
+            refreshControl.endRefreshing()
+        }
+    }
+    
+}
+
+// MARK: - UITableViewDelegate
+extension DiscoveryCommunityViewController: UITableViewDelegate, AutoGenerateTableViewDelegate {
+    // sourcery:inline:CommunityViewController.AutoGenerateTableViewDelegate
+
+    // Generated using Sourcery
+    // DO NOT EDIT
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        aspectTableView(tableView, didSelectRowAt: indexPath)
+    }
+
+    func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
+        return aspectTableView(tableView, contextMenuConfigurationForRowAt: indexPath, point: point)
+    }
+
+    func tableView(_ tableView: UITableView, previewForHighlightingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
+        return aspectTableView(tableView, previewForHighlightingContextMenuWithConfiguration: configuration)
+    }
+
+    func tableView(_ tableView: UITableView, previewForDismissingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
+        return aspectTableView(tableView, previewForDismissingContextMenuWithConfiguration: configuration)
+    }
+
+    func tableView(_ tableView: UITableView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
+        aspectTableView(tableView, willPerformPreviewActionForMenuWith: configuration, animator: animator)
+    }
+    // sourcery:end
+}
+
+// MARK: - StatusTableViewCellDelegate
+extension DiscoveryCommunityViewController: StatusTableViewCellDelegate { }
+
+// MARK: ScrollViewContainer
+extension DiscoveryCommunityViewController: ScrollViewContainer {
+    var scrollView: UIScrollView? {
+        tableView
+    }
+}
+
+extension DiscoveryCommunityViewController {
+    override var keyCommands: [UIKeyCommand]? {
+        return navigationKeyCommands + statusNavigationKeyCommands
+    }
+}
+
+// MARK: - StatusTableViewControllerNavigateable
+extension DiscoveryCommunityViewController: StatusTableViewControllerNavigateable {
+    @objc func navigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
+        navigateKeyCommandHandler(sender)
+    }
+
+    @objc func statusKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
+        statusKeyCommandHandler(sender)
+    }
+}

Mastodon/Scene/Discovery/Community/DiscoveryCommunityViewModel+Diffable.swift

@@ -0,0 +1,65 @@
+//
+//  DiscoveryCommunityViewModel+Diffable.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-29.
+//
+
+import UIKit
+import Combine
+
+extension DiscoveryCommunityViewModel {
+    
+    func setupDiffableDataSource(
+        tableView: UITableView,
+        statusTableViewCellDelegate: StatusTableViewCellDelegate
+    ) {
+        diffableDataSource = StatusSection.diffableDataSource(
+            tableView: tableView,
+            context: context,
+            configuration: StatusSection.Configuration(
+                statusTableViewCellDelegate: statusTableViewCellDelegate,
+                timelineMiddleLoaderTableViewCellDelegate: nil,
+                filterContext: .none,
+                activeFilters: nil
+            )
+        )
+        
+        stateMachine.enter(State.Reloading.self)
+        
+        statusFetchedResultsController.$records
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] records in
+                guard let self = self else { return }
+                guard let diffableDataSource = self.diffableDataSource else { return }
+                
+                var snapshot = NSDiffableDataSourceSnapshot<StatusSection, StatusItem>()
+                snapshot.appendSections([.main])
+                
+                let items = records.map { StatusItem.status(record: $0) }
+                snapshot.appendItems(items, toSection: .main)
+                
+                if let currentState = self.stateMachine.currentState {
+                    switch currentState {
+                    case is State.Initial,
+                        is State.Reloading,
+                        is State.Loading,
+                        is State.Idle,
+                        is State.Fail:
+                        if !items.isEmpty {
+                            snapshot.appendItems([.bottomLoader], toSection: .main)
+                        }
+                    case is State.NoMore:
+                        break
+                    default:
+                        assertionFailure()
+                        break
+                    }
+                }
+            
+                diffableDataSource.applySnapshot(snapshot, animated: false)
+            }
+            .store(in: &disposeBag)
+    }
+    
+}

Mastodon/Scene/Discovery/Community/DiscoveryCommunityViewModel+State.swift

@@ -0,0 +1,206 @@
+//
+//  DiscoveryCommunityViewModel+State.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-29.
+//
+
+import os.log
+import Foundation
+import GameplayKit
+import MastodonSDK
+
+extension DiscoveryCommunityViewModel {
+    class State: GKState, NamingState {
+        
+        let logger = Logger(subsystem: "DiscoveryCommunityViewModel.State", category: "StateMachine")
+
+        let id = UUID()
+
+        var name: String {
+            String(describing: Self.self)
+        }
+        
+        weak var viewModel: DiscoveryCommunityViewModel?
+        
+        init(viewModel: DiscoveryCommunityViewModel) {
+            self.viewModel = viewModel
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            let previousState = previousState as? DiscoveryCommunityViewModel.State
+            logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] enter \(self.name), previous: \(previousState?.name  ?? "<nil>")")
+        }
+        
+        @MainActor
+        func enter(state: State.Type) {
+            stateMachine?.enter(state)
+        }
+        
+        deinit {
+            logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] \(self.name)")
+        }
+    }
+}
+
+extension DiscoveryCommunityViewModel.State {
+    class Initial: DiscoveryCommunityViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+    }
+    
+    class Reloading: DiscoveryCommunityViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let _ = viewModel, let stateMachine = stateMachine else { return }
+
+            stateMachine.enter(Loading.self)
+        }
+    }
+    
+    class Fail: DiscoveryCommunityViewModel.State {
+        
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let _ = viewModel, let stateMachine = stateMachine else { return }
+            
+            os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: retry loading 3s later…", ((#file as NSString).lastPathComponent), #line, #function)
+            DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
+                os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: retry loading", ((#file as NSString).lastPathComponent), #line, #function)
+                stateMachine.enter(Loading.self)
+            }
+        }
+    }
+    
+    class Idle: DiscoveryCommunityViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type, is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+    }
+    
+    class Loading: DiscoveryCommunityViewModel.State {
+        
+        var maxID: String?
+
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Fail.Type:
+                return true
+            case is Idle.Type:
+                return true
+            case is NoMore.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
+                        
+            switch previousState {
+            case is Reloading:
+                maxID = nil
+            default:
+                break
+            }
+            
+            guard let authenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
+                stateMachine.enter(Fail.self)
+                return
+            }
+            
+            let maxID = self.maxID
+            let isReloading = maxID == nil
+
+            Task {
+                do {
+                    let response = try await viewModel.context.apiService.publicTimeline(
+                        query: .init(
+                            local: true,
+                            remote: nil,
+                            onlyMedia: nil,
+                            maxID: maxID,
+                            sinceID: nil,
+                            minID: nil,
+                            limit: 20
+                        ),
+                        authenticationBox: authenticationBox
+                    )
+                    
+                    let newMaxID = response.link?.maxID
+                    let hasMore = newMaxID != nil
+                    self.maxID = newMaxID
+                    
+                    var hasNewStatusesAppend = false
+                    var statusIDs = isReloading ? [] : viewModel.statusFetchedResultsController.statusIDs.value
+                    for status in response.value {
+                        guard !statusIDs.contains(status.id) else { continue }
+                        statusIDs.append(status.id)
+                        hasNewStatusesAppend = true
+                    }
+                    
+                    if hasNewStatusesAppend, hasMore {
+                        self.maxID = response.link?.maxID
+                        await enter(state: Idle.self)
+                    } else {
+                        await enter(state: NoMore.self)
+                    }
+                    viewModel.statusFetchedResultsController.statusIDs.value = statusIDs
+                    viewModel.didLoadLatest.send()
+                    
+                } catch {
+                    logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch user timeline fail: \(error.localizedDescription)")
+                    await enter(state: Fail.self)
+                }
+            }   // end Task
+        }   // end func
+    }
+    
+    class NoMore: DiscoveryCommunityViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            
+        }
+    }
+}

Mastodon/Scene/Discovery/Community/DiscoveryCommunityViewModel.swift

@@ -0,0 +1,65 @@
+//
+//  DiscoveryCommunityViewModel.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-29.
+//
+
+import os.log
+import UIKit
+import Combine
+import GameplayKit
+import CoreData
+import CoreDataStack
+import MastodonSDK
+
+final class DiscoveryCommunityViewModel {
+    
+    let logger = Logger(subsystem: "DiscoveryCommunityViewModel", category: "ViewModel")
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    let viewDidAppeared = PassthroughSubject<Void, Never>()
+    let statusFetchedResultsController: StatusFetchedResultsController
+    let listBatchFetchViewModel = ListBatchFetchViewModel()
+
+    // output
+    var diffableDataSource: UITableViewDiffableDataSource<StatusSection, StatusItem>?
+    private(set) lazy var stateMachine: GKStateMachine = {
+        let stateMachine = GKStateMachine(states: [
+            State.Initial(viewModel: self),
+            State.Reloading(viewModel: self),
+            State.Fail(viewModel: self),
+            State.Idle(viewModel: self),
+            State.Loading(viewModel: self),
+            State.NoMore(viewModel: self),
+        ])
+        stateMachine.enter(State.Initial.self)
+        return stateMachine
+    }()
+    
+    let didLoadLatest = PassthroughSubject<Void, Never>()
+    
+    init(context: AppContext) {
+        self.context = context
+        self.statusFetchedResultsController = StatusFetchedResultsController(
+            managedObjectContext: context.managedObjectContext,
+            domain: nil,
+            additionalTweetPredicate: nil
+        )
+        // end init
+        
+        context.authenticationService.activeMastodonAuthentication
+            .map { $0?.domain }
+            .assign(to: \.value, on: statusFetchedResultsController.domain)
+            .store(in: &disposeBag)
+    
+    }
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}

Mastodon/Scene/Discovery/Community/DiscoveryCommunityViewViewModel.swift

@@ -0,0 +1,64 @@
+//
+//  DiscoveryCommunityViewModel.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-29.
+//
+
+import os.log
+import UIKit
+import Combine
+import GameplayKit
+import CoreData
+import CoreDataStack
+import MastodonSDK
+
+final class DiscoveryCommunityViewModel {
+    
+    let logger = Logger(subsystem: "DiscoveryCommunityViewModel", category: "ViewModel")
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    let viewDidAppeared = PassthroughSubject<Void, Never>()
+    let statusFetchedResultsController: StatusFetchedResultsController
+
+    // output
+    var diffableDataSource: UITableViewDiffableDataSource<StatusSection, StatusItem>?
+    private(set) lazy var stateMachine: GKStateMachine = {
+        let stateMachine = GKStateMachine(states: [
+            State.Initial(viewModel: self),
+            State.Reloading(viewModel: self),
+            State.Fail(viewModel: self),
+            State.Idle(viewModel: self),
+            State.Loading(viewModel: self),
+            State.NoMore(viewModel: self),
+        ])
+        stateMachine.enter(State.Initial.self)
+        return stateMachine
+    }()
+    
+    let didLoadLatest = PassthroughSubject<Void, Never>()
+    
+    init(context: AppContext) {
+        self.context = context
+        self.statusFetchedResultsController = StatusFetchedResultsController(
+            managedObjectContext: context.managedObjectContext,
+            domain: nil,
+            additionalTweetPredicate: nil
+        )
+        // end init
+        
+        context.authenticationService.activeMastodonAuthentication
+            .map { $0?.domain }
+            .assign(to: \.value, on: statusFetchedResultsController.domain)
+            .store(in: &disposeBag)
+    
+    }
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}

Mastodon/Scene/Discovery/DiscoveryViewController.swift

@@ -0,0 +1,157 @@
+//
+//  DiscoveryViewController.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-12.
+//
+
+import os.log
+import UIKit
+import Combine
+import Tabman
+import Pageboy
+import MastodonAsset
+import MastodonUI
+
+public class DiscoveryViewController: TabmanViewController, NeedsDependency {
+    
+    public static let containerViewMarginForRegularHorizontalSizeClass: CGFloat = 64
+    public static let containerViewMarginForCompactHorizontalSizeClass: CGFloat = 16
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    let logger = Logger(subsystem: "DiscoveryViewController", category: "ViewController")
+    
+    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
+    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
+    
+    private(set) lazy var viewModel = DiscoveryViewModel(
+        context: context,
+        coordinator: coordinator
+    )
+    
+    private(set) lazy var buttonBar: TMBar.ButtonBar = {
+        let buttonBar = TMBar.ButtonBar()
+        buttonBar.backgroundView.style = .custom(view: buttonBarBackgroundView)
+        buttonBar.layout.interButtonSpacing = 0
+        buttonBar.layout.contentInset = .zero
+        buttonBar.indicator.backgroundColor = Asset.Colors.Label.primary.color
+        buttonBar.indicator.weight = .custom(value: 2)
+        return buttonBar
+    }()
+    
+    let buttonBarBackgroundView: UIView = {
+        let view = UIView()
+        let barBottomLine = UIView.separatorLine
+        barBottomLine.backgroundColor = Asset.Colors.Label.secondary.color.withAlphaComponent(0.5)
+        barBottomLine.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(barBottomLine)
+        NSLayoutConstraint.activate([
+            barBottomLine.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            barBottomLine.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            barBottomLine.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            barBottomLine.heightAnchor.constraint(equalToConstant: 2).priority(.required - 1),
+        ])
+        return view
+    }()
+    
+    func customizeButtonBarAppearance() {
+        // The implmention use CATextlayer. Adapt for Dark Mode without dynamic colors
+        // Needs trigger update when `userInterfaceStyle` chagnes
+        let userInterfaceStyle = traitCollection.userInterfaceStyle
+        buttonBar.buttons.customize { button in
+            switch userInterfaceStyle {
+            case .dark:
+                // Asset.Colors.Label.primary.color
+                button.selectedTintColor = UIColor(red: 238.0/255.0, green: 238.0/255.0, blue: 238.0/255.0, alpha: 1.0)
+                // Asset.Colors.Label.secondary.color
+                button.tintColor = UIColor(red: 151.0/255.0, green: 157.0/255.0, blue: 173.0/255.0, alpha: 1.0)
+            default:
+                // Asset.Colors.Label.primary.color
+                button.selectedTintColor = UIColor(red: 40.0/255.0, green: 44.0/255.0, blue: 55.0/255.0, alpha: 1.0)
+                // Asset.Colors.Label.secondary.color
+                button.tintColor = UIColor(red: 60.0/255.0, green: 60.0/255.0, blue: 67.0/255.0, alpha: 0.6)
+            }
+            
+            button.backgroundColor = .clear
+            button.contentInset = UIEdgeInsets(top: 12, left: 26, bottom: 12, right: 26)
+        }
+    }
+    
+}
+
+extension DiscoveryViewController {
+    
+    public override func viewDidLoad() {
+        super.viewDidLoad()
+
+        setupAppearance(theme: ThemeService.shared.currentTheme.value)
+        ThemeService.shared.currentTheme
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] theme in
+                guard let self = self else { return }
+                self.setupAppearance(theme: theme)
+            }
+            .store(in: &disposeBag)
+        
+        dataSource = viewModel
+        addBar(
+            buttonBar,
+            dataSource: viewModel,
+            at: .top
+        )
+        customizeButtonBarAppearance()
+    
+        viewModel.$viewControllers
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.reloadData()
+            }
+            .store(in: &disposeBag)
+    }
+    
+    public override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
+        super.traitCollectionDidChange(previousTraitCollection)
+
+        customizeButtonBarAppearance()
+    }
+
+}
+
+extension DiscoveryViewController {
+    
+    private func setupAppearance(theme: Theme) {
+        view.backgroundColor = theme.secondarySystemBackgroundColor
+        buttonBarBackgroundView.backgroundColor = theme.systemBackgroundColor
+    }
+    
+}
+
+// MARK: - ScrollViewContainer
+extension DiscoveryViewController: ScrollViewContainer {
+    var scrollView: UIScrollView? {
+        return (currentViewController as? ScrollViewContainer)?.scrollView
+    }
+}
+
+extension DiscoveryViewController {
+
+    public override var keyCommands: [UIKeyCommand]? {
+        return pageboyNavigateKeyCommands
+    }
+
+}
+
+// MARK: - PageboyNavigateable
+extension DiscoveryViewController: PageboyNavigateable {
+    
+    var navigateablePageViewController: PageboyViewController {
+        return self
+    }
+    
+    @objc func pageboyNavigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
+        pageboyNavigateKeyCommandHandler(sender)
+    }
+    
+}

Mastodon/Scene/Discovery/DiscoveryViewModel.swift

@@ -0,0 +1,173 @@
+//
+//  DiscoveryViewModel.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-12.
+//
+
+import UIKit
+import Combine
+import Tabman
+import Pageboy
+import MastodonLocalization
+
+final class DiscoveryViewModel {
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    let discoveryPostsViewController: DiscoveryPostsViewController
+    let discoveryHashtagsViewController: DiscoveryHashtagsViewController
+    let discoveryNewsViewController: DiscoveryNewsViewController
+    let discoveryCommunityViewController: DiscoveryCommunityViewController
+    let discoveryForYouViewController: DiscoveryForYouViewController
+    
+    @Published var viewControllers: [ScrollViewContainer & PageViewController]
+    
+    init(context: AppContext, coordinator: SceneCoordinator) {
+        func setupDependency(_ needsDependency: NeedsDependency) {
+            needsDependency.context = context
+            needsDependency.coordinator = coordinator
+        }
+        
+        self.context = context
+        discoveryPostsViewController = {
+            let viewController = DiscoveryPostsViewController()
+            setupDependency(viewController)
+            viewController.viewModel = DiscoveryPostsViewModel(context: context)
+            return viewController
+        }()
+        discoveryHashtagsViewController = {
+            let viewController = DiscoveryHashtagsViewController()
+            setupDependency(viewController)
+            viewController.viewModel = DiscoveryHashtagsViewModel(context: context)
+            return viewController
+        }()
+        discoveryNewsViewController = {
+            let viewController = DiscoveryNewsViewController()
+            setupDependency(viewController)
+            viewController.viewModel = DiscoveryNewsViewModel(context: context)
+            return viewController
+        }()
+        discoveryCommunityViewController = {
+            let viewController = DiscoveryCommunityViewController()
+            setupDependency(viewController)
+            viewController.viewModel = DiscoveryCommunityViewModel(context: context)
+            return viewController
+        }()
+        discoveryForYouViewController = {
+            let viewController = DiscoveryForYouViewController()
+            setupDependency(viewController)
+            viewController.viewModel = DiscoveryForYouViewModel(context: context)
+            return viewController
+        }()
+        self.viewControllers = [
+            discoveryPostsViewController,
+            discoveryHashtagsViewController,
+            discoveryNewsViewController,
+            discoveryCommunityViewController,
+            discoveryForYouViewController,
+        ]
+        // end init
+        
+        discoveryPostsViewController.viewModel.$isServerSupportEndpoint
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] isServerSupportEndpoint in
+                guard let self = self else { return }
+                if !isServerSupportEndpoint {
+                    self.viewControllers.removeAll(where: {
+                        $0 === self.discoveryPostsViewController || $0 === self.discoveryPostsViewController
+                    })
+                }
+            }
+            .store(in: &disposeBag)
+        
+        discoveryNewsViewController.viewModel.$isServerSupportEndpoint
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] isServerSupportEndpoint in
+                guard let self = self else { return }
+                if !isServerSupportEndpoint {
+                    self.viewControllers.removeAll(where: { $0 === self.discoveryNewsViewController })
+                }
+            }
+            .store(in: &disposeBag)
+    }
+    
+}
+
+
+// MARK: - PageboyViewControllerDataSource
+extension DiscoveryViewModel: PageboyViewControllerDataSource {
+    
+    func numberOfViewControllers(in pageboyViewController: PageboyViewController) -> Int {
+        return viewControllers.count
+    }
+    
+    func viewController(for pageboyViewController: PageboyViewController, at index: PageboyViewController.PageIndex) -> UIViewController? {
+        return viewControllers[index]
+    }
+    
+    func defaultPage(for pageboyViewController: PageboyViewController) -> PageboyViewController.Page? {
+        return .first
+    }
+    
+}
+
+// MARK: - TMBarDataSource
+extension DiscoveryViewModel: TMBarDataSource {
+    func barItem(for bar: TMBar, at index: Int) -> TMBarItemable {
+        guard !viewControllers.isEmpty, index < viewControllers.count else {
+            assertionFailure()
+            return TMBarItem(title: "")
+        }
+        return viewControllers[index].tabItem
+    }
+}
+
+protocol PageViewController: UIViewController {
+    var tabItemTitle: String { get }
+    var tabItem: TMBarItemable { get }
+}
+
+// MARK: - PageViewController
+extension DiscoveryPostsViewController: PageViewController {
+    var tabItemTitle: String { L10n.Scene.Discovery.Tabs.posts }
+    var tabItem: TMBarItemable {
+        return TMBarItem(title: tabItemTitle)
+    }
+}
+
+
+// MARK: - PageViewController
+extension DiscoveryHashtagsViewController: PageViewController {
+    var tabItemTitle: String { L10n.Scene.Discovery.Tabs.hashtags }
+    var tabItem: TMBarItemable {
+
+        return TMBarItem(title: tabItemTitle)
+    }
+}
+
+// MARK: - PageViewController
+extension DiscoveryNewsViewController: PageViewController {
+    var tabItemTitle: String { L10n.Scene.Discovery.Tabs.news }
+    var tabItem: TMBarItemable {
+        return TMBarItem(title: tabItemTitle)
+    }
+}
+
+// MARK: - PageViewController
+extension DiscoveryCommunityViewController: PageViewController {
+    var tabItemTitle: String { L10n.Scene.Discovery.Tabs.community }
+    var tabItem: TMBarItemable {
+        return TMBarItem(title: tabItemTitle)
+    }
+}
+
+// MARK: - PageViewController
+extension DiscoveryForYouViewController: PageViewController {
+    var tabItemTitle: String { L10n.Scene.Discovery.Tabs.forYou }
+    var tabItem: TMBarItemable {
+        return TMBarItem(title: tabItemTitle)
+    }
+}

Mastodon/Scene/Discovery/ForYou/DiscoveryForYouViewController.swift

@@ -0,0 +1,146 @@
+//
+//  DiscoveryForYouViewController.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-14.
+//
+
+import os.log
+import UIKit
+import Combine
+import MastodonUI
+
+final class DiscoveryForYouViewController: UIViewController, NeedsDependency, MediaPreviewableViewController {
+    
+    let logger = Logger(subsystem: "DiscoveryForYouViewController", category: "ViewController")
+    
+    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
+    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
+    
+    var disposeBag = Set<AnyCancellable>()
+    var viewModel: DiscoveryForYouViewModel!
+    
+    let mediaPreviewTransitionController = MediaPreviewTransitionController()
+
+    lazy var tableView: UITableView = {
+        let tableView = UITableView()
+        tableView.rowHeight = UITableView.automaticDimension
+        tableView.estimatedRowHeight = 100
+        tableView.separatorStyle = .none
+        tableView.backgroundColor = .clear
+        return tableView
+    }()
+    
+    let refreshControl = UIRefreshControl()
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension DiscoveryForYouViewController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        view.backgroundColor = ThemeService.shared.currentTheme.value.secondarySystemBackgroundColor
+        ThemeService.shared.currentTheme
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] theme in
+                guard let self = self else { return }
+                self.view.backgroundColor = theme.secondarySystemBackgroundColor
+            }
+            .store(in: &disposeBag)
+        
+        tableView.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(tableView)
+        NSLayoutConstraint.activate([
+            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+
+        tableView.delegate = self
+        viewModel.setupDiffableDataSource(
+            tableView: tableView,
+            profileCardTableViewCellDelegate: self
+        )
+        
+        tableView.refreshControl = refreshControl
+        refreshControl.addTarget(self, action: #selector(DiscoveryForYouViewController.refreshControlValueChanged(_:)), for: .valueChanged)
+        viewModel.$isFetching
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] isFetching in
+                guard let self = self else { return }
+                if !isFetching {
+                    self.refreshControl.endRefreshing()
+                }
+            }
+            .store(in: &disposeBag)
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        refreshControl.endRefreshing()
+        tableView.deselectRow(with: transitionCoordinator, animated: animated)
+    }
+
+}
+
+extension DiscoveryForYouViewController {
+    
+    @objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
+        Task {
+            try await viewModel.fetch()
+        }
+    }
+    
+}
+
+// MARK: - UITableViewDelegate
+extension DiscoveryForYouViewController: UITableViewDelegate {
+
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): \(indexPath)")
+        guard case let .user(record) = viewModel.diffableDataSource?.itemIdentifier(for: indexPath) else { return }
+        guard let user = record.object(in: context.managedObjectContext) else { return }
+        let profileViewModel = CachedProfileViewModel(
+            context: context,
+            mastodonUser: user
+        )
+        coordinator.present(
+            scene: .profile(viewModel: profileViewModel),
+            from: self,
+            transition: .show
+        )
+    }
+
+}
+
+// MARK: - ProfileCardTableViewCellDelegate
+extension DiscoveryForYouViewController: ProfileCardTableViewCellDelegate {
+    func profileCardTableViewCell(_ cell: ProfileCardTableViewCell, profileCardView: ProfileCardView, relationshipButtonDidPressed button: ProfileRelationshipActionButton) {
+        guard let authenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else { return }
+        guard let indexPath = tableView.indexPath(for: cell) else { return }
+        guard case let .user(record) = viewModel.diffableDataSource?.itemIdentifier(for: indexPath) else { return }
+        
+        Task {
+            try await DataSourceFacade.responseToUserFollowAction(
+                dependency: self,
+                user: record,
+                authenticationBox: authenticationBox
+            )
+        }   // end Task
+    }
+}
+
+// MARK: ScrollViewContainer
+extension DiscoveryForYouViewController: ScrollViewContainer {
+    var scrollView: UIScrollView? {
+        tableView
+    }
+}
+

Mastodon/Scene/Discovery/ForYou/DiscoveryForYouViewModel+Diffable.swift

@@ -0,0 +1,47 @@
+//
+//  DiscoveryForYouViewModel+Diffable.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-14.
+//
+
+import UIKit
+import Combine
+import MastodonUI
+
+extension DiscoveryForYouViewModel {
+    
+    func setupDiffableDataSource(
+        tableView: UITableView,
+        profileCardTableViewCellDelegate: ProfileCardTableViewCellDelegate
+    ) {
+        diffableDataSource = DiscoverySection.diffableDataSource(
+            tableView: tableView,
+            context: context,
+            configuration: DiscoverySection.Configuration(
+                profileCardTableViewCellDelegate: profileCardTableViewCellDelegate
+            )
+        )
+        
+        Task {
+            try await fetch()
+        }
+        
+        userFetchedResultsController.$records
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] records in
+                guard let self = self else { return }
+                guard let diffableDataSource = self.diffableDataSource else { return }
+                
+                var snapshot = NSDiffableDataSourceSnapshot<DiscoverySection, DiscoveryItem>()
+                snapshot.appendSections([.forYou])
+                
+                let items = records.map { DiscoveryItem.user($0) }
+                snapshot.appendItems(items, toSection: .forYou)
+            
+                diffableDataSource.applySnapshot(snapshot, animated: false)
+            }
+            .store(in: &disposeBag)
+    }
+    
+}

Mastodon/Scene/Discovery/ForYou/DiscoveryForYouViewModel.swift

@@ -0,0 +1,75 @@
+//
+//  DiscoveryForYouViewModel.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-14.
+//
+
+import os.log
+import UIKit
+import Combine
+import GameplayKit
+import CoreData
+import CoreDataStack
+import MastodonSDK
+
+final class DiscoveryForYouViewModel {
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    let userFetchedResultsController: UserFetchedResultsController
+    @Published var isFetching = false
+
+    // output
+    var diffableDataSource: UITableViewDiffableDataSource<DiscoverySection, DiscoveryItem>?
+    let didLoadLatest = PassthroughSubject<Void, Never>()
+    
+    init(context: AppContext) {
+        self.context = context
+        self.userFetchedResultsController = UserFetchedResultsController(
+            managedObjectContext: context.managedObjectContext,
+            domain: nil,
+            additionalPredicate: nil
+        )
+        // end init
+        
+        context.authenticationService.activeMastodonAuthenticationBox
+            .map { $0?.domain }
+            .assign(to: \.domain, on: userFetchedResultsController)
+            .store(in: &disposeBag)
+    }
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension DiscoveryForYouViewModel {
+    func fetch() async throws {
+        guard !isFetching else { return }
+        isFetching = true
+        defer { isFetching = false }
+
+        guard let authenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return }
+        
+        do {
+            let response = try await context.apiService.suggestionAccountV2(
+                query: nil,
+                authenticationBox: authenticationBox
+            )
+            let userIDs = response.value.map { $0.account.id }
+            userFetchedResultsController.userIDs = userIDs
+        } catch {
+            // fallback V1
+            let response2 = try await context.apiService.suggestionAccount(
+                query: nil,
+                authenticationBox: authenticationBox
+            )
+            let userIDs = response2.value.map { $0.id }
+            userFetchedResultsController.userIDs = userIDs
+        }
+    }
+}

Mastodon/Scene/Discovery/Hashtags/DiscoveryHashtagsViewController.swift

@@ -0,0 +1,228 @@
+//
+//  DiscoveryHashtagsViewController.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import os.log
+import UIKit
+import Combine
+import MastodonUI
+
+final class DiscoveryHashtagsViewController: UIViewController, NeedsDependency, MediaPreviewableViewController {
+    
+    let logger = Logger(subsystem: "TrendPostsViewController", category: "ViewController")
+    
+    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
+    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
+    
+    var disposeBag = Set<AnyCancellable>()
+    var viewModel: DiscoveryHashtagsViewModel!
+    
+    let mediaPreviewTransitionController = MediaPreviewTransitionController()
+
+    lazy var tableView: UITableView = {
+        let tableView = UITableView()
+        tableView.rowHeight = UITableView.automaticDimension
+        tableView.estimatedRowHeight = 100
+        tableView.separatorStyle = .none
+        tableView.backgroundColor = .clear
+        return tableView
+    }()
+    
+    let refreshControl = UIRefreshControl()
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension DiscoveryHashtagsViewController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        view.backgroundColor = ThemeService.shared.currentTheme.value.secondarySystemBackgroundColor
+        ThemeService.shared.currentTheme
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] theme in
+                guard let self = self else { return }
+                self.view.backgroundColor = theme.secondarySystemBackgroundColor
+            }
+            .store(in: &disposeBag)
+        
+        tableView.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(tableView)
+        NSLayoutConstraint.activate([
+            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+        
+        tableView.refreshControl = refreshControl
+        refreshControl.addTarget(self, action: #selector(DiscoveryHashtagsViewController.refreshControlValueChanged(_:)), for: .valueChanged)
+
+        tableView.delegate = self
+        viewModel.setupDiffableDataSource(
+            tableView: tableView
+        )
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        tableView.deselectRow(with: transitionCoordinator, animated: animated)
+    }
+    
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        
+        viewModel.viewDidAppeared.send()
+    }
+    
+}
+
+extension DiscoveryHashtagsViewController {
+    
+    @objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
+        Task { @MainActor in
+            do {
+                try await viewModel.fetch()
+            } catch {
+                // do nothing
+            }
+            sender.endRefreshing()
+        }   // end Task
+    }
+    
+}
+
+// MARK: - UITableViewDelegate
+extension DiscoveryHashtagsViewController: UITableViewDelegate {
+
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): \(indexPath)")
+        guard case let .hashtag(tag) = viewModel.diffableDataSource?.itemIdentifier(for: indexPath) else { return }
+        let hashtagTimelineViewModel = HashtagTimelineViewModel(context: context, hashtag: tag.name)
+        coordinator.present(
+            scene: .hashtagTimeline(viewModel: hashtagTimelineViewModel),
+            from: self,
+            transition: .show
+        )
+    }
+    
+    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
+        guard let cell = cell as? TrendTableViewCell else { return }
+        guard let diffableDataSource = viewModel.diffableDataSource else { return }
+        guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return }
+
+        if let lastItem = diffableDataSource.snapshot().itemIdentifiers.last, item == lastItem {
+            cell.configureSeparator(style: .edge)
+        }
+    }
+}
+
+// MARK: ScrollViewContainer
+extension DiscoveryHashtagsViewController: ScrollViewContainer {
+    var scrollView: UIScrollView? {
+        tableView
+    }
+}
+
+extension DiscoveryHashtagsViewController {
+    override var keyCommands: [UIKeyCommand]? {
+        return navigationKeyCommands
+    }
+}
+
+// MARK: - TableViewControllerNavigateable
+extension DiscoveryHashtagsViewController: TableViewControllerNavigateable {
+    @objc func navigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
+        navigateKeyCommandHandler(sender)
+    }
+    
+    func navigate(direction: TableViewNavigationDirection) {
+        if let indexPathForSelectedRow = tableView.indexPathForSelectedRow {
+            // navigate up/down on the current selected item
+            navigateToTag(direction: direction, indexPath: indexPathForSelectedRow)
+        } else {
+            // set first visible item selected
+            navigateToFirstVisibleTag()
+        }
+    }
+    
+    private func navigateToTag(direction: TableViewNavigationDirection, indexPath: IndexPath) {
+        guard let diffableDataSource = viewModel.diffableDataSource else { return }
+        let items = diffableDataSource.snapshot().itemIdentifiers
+        guard let selectedItem = diffableDataSource.itemIdentifier(for: indexPath),
+              let selectedItemIndex = items.firstIndex(of: selectedItem) else {
+            return
+        }
+
+        let _navigateToItem: DiscoveryItem? = {
+            var index = selectedItemIndex
+            while 0..<items.count ~= index {
+                index = {
+                    switch direction {
+                    case .up:   return index - 1
+                    case .down: return index + 1
+                    }
+                }()
+                guard 0..<items.count ~= index else { return nil }
+                let item = items[index]
+                
+                guard Self.validNavigateableItem(item) else { continue }
+                return item
+            }
+            return nil
+        }()
+        
+        guard let item = _navigateToItem, let indexPath = diffableDataSource.indexPath(for: item) else { return }
+        let scrollPosition: UITableView.ScrollPosition = overrideNavigationScrollPosition ?? Self.navigateScrollPosition(tableView: tableView, indexPath: indexPath)
+        tableView.selectRow(at: indexPath, animated: true, scrollPosition: scrollPosition)
+    }
+    
+    private func navigateToFirstVisibleTag() {
+        guard let indexPathsForVisibleRows = tableView.indexPathsForVisibleRows else { return }
+        guard let diffableDataSource = viewModel.diffableDataSource else { return }
+        
+        var visibleItems: [DiscoveryItem] = indexPathsForVisibleRows.sorted().compactMap { indexPath in
+            guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return nil }
+            guard Self.validNavigateableItem(item) else { return nil }
+            return item
+        }
+        if indexPathsForVisibleRows.first?.row != 0, visibleItems.count > 1 {
+            // drop first when visible not the first cell of table
+            visibleItems.removeFirst()
+        }
+        guard let item = visibleItems.first, let indexPath = diffableDataSource.indexPath(for: item) else { return }
+        let scrollPosition: UITableView.ScrollPosition = overrideNavigationScrollPosition ?? Self.navigateScrollPosition(tableView: tableView, indexPath: indexPath)
+        tableView.selectRow(at: indexPath, animated: true, scrollPosition: scrollPosition)
+    }
+    
+    static func validNavigateableItem(_ item: DiscoveryItem) -> Bool {
+        switch item {
+        case .hashtag:
+            return true
+        default:
+            return false
+        }
+    }
+    
+    func open() {
+        guard let indexPathForSelectedRow = tableView.indexPathForSelectedRow else { return }
+        guard let diffableDataSource = viewModel.diffableDataSource else { return }
+        guard let item = diffableDataSource.itemIdentifier(for: indexPathForSelectedRow) else { return }
+        
+        guard case let .hashtag(tag) = item else { return }
+        let hashtagTimelineViewModel = HashtagTimelineViewModel(context: context, hashtag: tag.name)
+        coordinator.present(
+            scene: .hashtagTimeline(viewModel: hashtagTimelineViewModel),
+            from: self,
+            transition: .show
+        )
+    }
+}

Mastodon/Scene/Discovery/Hashtags/DiscoveryHashtagsViewModel+Diffable.swift

@@ -0,0 +1,42 @@
+//
+//  DiscoveryHashtagsViewModel+Diffable.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import UIKit
+
+extension DiscoveryHashtagsViewModel {
+    
+    func setupDiffableDataSource(
+        tableView: UITableView
+    ) {
+        diffableDataSource = DiscoverySection.diffableDataSource(
+            tableView: tableView,
+            context: context,
+            configuration: DiscoverySection.Configuration()
+        )
+        
+        var snapshot = NSDiffableDataSourceSnapshot<DiscoverySection, DiscoveryItem>()
+        snapshot.appendSections([.hashtags])
+        diffableDataSource?.apply(snapshot)
+        
+        $hashtags
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] hashtags in
+                guard let self = self else { return }
+                guard let diffableDataSource = self.diffableDataSource else { return }
+                
+                var snapshot = NSDiffableDataSourceSnapshot<DiscoverySection, DiscoveryItem>()
+                snapshot.appendSections([.hashtags])
+                
+                let items = hashtags.map { DiscoveryItem.hashtag($0) }
+                snapshot.appendItems(items, toSection: .hashtags)
+                
+                diffableDataSource.apply(snapshot)
+            }
+            .store(in: &disposeBag)
+    }
+    
+}

Mastodon/Scene/Discovery/Hashtags/DiscoveryHashtagsViewModel.swift

@@ -0,0 +1,77 @@
+//
+//  DiscoveryHashtagsViewModel.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import os.log
+import UIKit
+import Combine
+import GameplayKit
+import CoreData
+import CoreDataStack
+import MastodonSDK
+
+final class DiscoveryHashtagsViewModel {
+    
+    let logger = Logger(subsystem: "DiscoveryHashtagsViewModel", category: "ViewModel")
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    let viewDidAppeared = PassthroughSubject<Void, Never>()
+
+    // output
+    var diffableDataSource: UITableViewDiffableDataSource<DiscoverySection, DiscoveryItem>?
+    @Published var hashtags: [Mastodon.Entity.Tag] = []
+    
+    init(context: AppContext) {
+        self.context = context
+        // end init
+        
+        Publishers.CombineLatest(
+            context.authenticationService.activeMastodonAuthenticationBox,
+            viewDidAppeared
+        )
+        .compactMap { authenticationBox, _ -> MastodonAuthenticationBox? in
+            return authenticationBox
+        }
+        .throttle(for: 3, scheduler: DispatchQueue.main, latest: true)
+        .asyncMap { authenticationBox in
+            try await context.apiService.trendHashtags(domain: authenticationBox.domain, query: nil)
+        }
+        .retry(3)
+        .map { response in Result<Mastodon.Response.Content<[Mastodon.Entity.Tag]>, Error> { response } }
+        .catch { error in Just(Result<Mastodon.Response.Content<[Mastodon.Entity.Tag]>, Error> { throw error }) }
+        .receive(on: DispatchQueue.main)
+        .sink { [weak self] result in
+            guard let self = self else { return }
+            switch result {
+            case .success(let response):
+                self.hashtags = response.value.filter { !$0.name.isEmpty }
+            case .failure:
+                break
+            }
+        }
+        .store(in: &disposeBag)
+    }
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension DiscoveryHashtagsViewModel {
+    
+    @MainActor
+    func fetch() async throws {
+        guard let authenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return }
+        let response = try await context.apiService.trendHashtags(domain: authenticationBox.domain, query: nil)
+        hashtags = response.value.filter { !$0.name.isEmpty }
+        logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch tags: \(response.value.count)")
+    }
+    
+}

Mastodon/Scene/Discovery/News/DiscoveryNewsViewController.swift

@@ -0,0 +1,229 @@
+//
+//  DiscoveryNewsViewController.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import os.log
+import UIKit
+import Combine
+import MastodonUI
+
+final class DiscoveryNewsViewController: UIViewController, NeedsDependency, MediaPreviewableViewController {
+    
+    let logger = Logger(subsystem: "TrendPostsViewController", category: "ViewController")
+    
+    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
+    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
+    
+    var disposeBag = Set<AnyCancellable>()
+    var viewModel: DiscoveryNewsViewModel!
+    
+    let mediaPreviewTransitionController = MediaPreviewTransitionController()
+
+    lazy var tableView: UITableView = {
+        let tableView = UITableView()
+        tableView.rowHeight = UITableView.automaticDimension
+        tableView.estimatedRowHeight = 100
+        tableView.separatorStyle = .none
+        tableView.backgroundColor = .clear
+        return tableView
+    }()
+    
+    let refreshControl = UIRefreshControl()
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension DiscoveryNewsViewController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        view.backgroundColor = ThemeService.shared.currentTheme.value.secondarySystemBackgroundColor
+        ThemeService.shared.currentTheme
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] theme in
+                guard let self = self else { return }
+                self.view.backgroundColor = theme.secondarySystemBackgroundColor
+            }
+            .store(in: &disposeBag)
+        
+        tableView.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(tableView)
+        NSLayoutConstraint.activate([
+            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+
+        tableView.delegate = self
+        viewModel.setupDiffableDataSource(
+            tableView: tableView
+        )
+        
+        tableView.refreshControl = refreshControl
+        refreshControl.addTarget(self, action: #selector(DiscoveryNewsViewController.refreshControlValueChanged(_:)), for: .valueChanged)
+        viewModel.didLoadLatest
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.refreshControl.endRefreshing()
+            }
+            .store(in: &disposeBag)
+        
+        // setup batch fetch
+        viewModel.listBatchFetchViewModel.setup(scrollView: tableView)
+        viewModel.listBatchFetchViewModel.shouldFetch
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                guard self.view.window != nil else { return }
+                self.viewModel.stateMachine.enter(DiscoveryNewsViewModel.State.Loading.self)
+            }
+            .store(in: &disposeBag)
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        refreshControl.endRefreshing()
+        tableView.deselectRow(with: transitionCoordinator, animated: animated)
+    }
+
+}
+
+extension DiscoveryNewsViewController {
+    
+    @objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
+        guard viewModel.stateMachine.enter(DiscoveryNewsViewModel.State.Reloading.self) else {
+            sender.endRefreshing()
+            return
+        }
+    }
+    
+}
+
+// MARK: - UITableViewDelegate
+extension DiscoveryNewsViewController: UITableViewDelegate {
+
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): \(indexPath)")
+        guard case let .link(link) = viewModel.diffableDataSource?.itemIdentifier(for: indexPath) else { return }
+        guard let url = URL(string: link.url) else { return }
+        coordinator.present(
+            scene: .safari(url: url),
+            from: self,
+            transition: .safariPresent(animated: true, completion: nil)
+        )
+    }
+
+}
+
+// MARK: ScrollViewContainer
+extension DiscoveryNewsViewController: ScrollViewContainer {
+    var scrollView: UIScrollView? {
+        tableView
+    }
+}
+
+extension DiscoveryNewsViewController {
+    override var keyCommands: [UIKeyCommand]? {
+        return navigationKeyCommands
+    }
+}
+
+extension DiscoveryNewsViewController: TableViewControllerNavigateable {
+    
+    func navigate(direction: TableViewNavigationDirection) {
+        if let indexPathForSelectedRow = tableView.indexPathForSelectedRow {
+            // navigate up/down on the current selected item
+            navigateToLink(direction: direction, indexPath: indexPathForSelectedRow)
+        } else {
+            // set first visible item selected
+            navigateToFirstVisibleLink()
+        }
+    }
+    
+    private func navigateToLink(direction: TableViewNavigationDirection, indexPath: IndexPath) {
+        guard let diffableDataSource = viewModel.diffableDataSource else { return }
+        let items = diffableDataSource.snapshot().itemIdentifiers
+        guard let selectedItem = diffableDataSource.itemIdentifier(for: indexPath),
+              let selectedItemIndex = items.firstIndex(of: selectedItem) else {
+            return
+        }
+
+        let _navigateToItem: DiscoveryItem? = {
+            var index = selectedItemIndex
+            while 0..<items.count ~= index {
+                index = {
+                    switch direction {
+                    case .up:   return index - 1
+                    case .down: return index + 1
+                    }
+                }()
+                guard 0..<items.count ~= index else { return nil }
+                let item = items[index]
+                
+                guard Self.validNavigateableItem(item) else { continue }
+                return item
+            }
+            return nil
+        }()
+        
+        guard let item = _navigateToItem, let indexPath = diffableDataSource.indexPath(for: item) else { return }
+        let scrollPosition: UITableView.ScrollPosition = overrideNavigationScrollPosition ?? Self.navigateScrollPosition(tableView: tableView, indexPath: indexPath)
+        tableView.selectRow(at: indexPath, animated: true, scrollPosition: scrollPosition)
+    }
+    
+    private func navigateToFirstVisibleLink() {
+        guard let indexPathsForVisibleRows = tableView.indexPathsForVisibleRows else { return }
+        guard let diffableDataSource = viewModel.diffableDataSource else { return }
+        
+        var visibleItems: [DiscoveryItem] = indexPathsForVisibleRows.sorted().compactMap { indexPath in
+            guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return nil }
+            guard Self.validNavigateableItem(item) else { return nil }
+            return item
+        }
+        if indexPathsForVisibleRows.first?.row != 0, visibleItems.count > 1 {
+            // drop first when visible not the first cell of table
+            visibleItems.removeFirst()
+        }
+        guard let item = visibleItems.first, let indexPath = diffableDataSource.indexPath(for: item) else { return }
+        let scrollPosition: UITableView.ScrollPosition = overrideNavigationScrollPosition ?? Self.navigateScrollPosition(tableView: tableView, indexPath: indexPath)
+        tableView.selectRow(at: indexPath, animated: true, scrollPosition: scrollPosition)
+    }
+    
+    static func validNavigateableItem(_ item: DiscoveryItem) -> Bool {
+        switch item {
+        case .link:
+            return true
+        default:
+            return false
+        }
+    }
+    
+    func open() {
+        guard let indexPathForSelectedRow = tableView.indexPathForSelectedRow else { return }
+        guard let diffableDataSource = viewModel.diffableDataSource else { return }
+        guard let item = diffableDataSource.itemIdentifier(for: indexPathForSelectedRow) else { return }
+        
+        guard case let .link(link) = item else { return }
+        guard let url = URL(string: link.url) else { return }
+        coordinator.present(
+            scene: .safari(url: url),
+            from: self,
+            transition: .safariPresent(animated: true, completion: nil)
+        )
+    }
+    
+    func navigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
+        navigateKeyCommandHandler(sender)
+    }
+
+}

Mastodon/Scene/Discovery/News/DiscoveryNewsViewModel+Diffable.swift

@@ -0,0 +1,60 @@
+//
+//  DiscoveryNewsViewModel+Diffable.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import UIKit
+import Combine
+
+extension DiscoveryNewsViewModel {
+    
+    func setupDiffableDataSource(
+        tableView: UITableView
+    ) {
+        diffableDataSource = DiscoverySection.diffableDataSource(
+            tableView: tableView,
+            context: context,
+            configuration: DiscoverySection.Configuration()
+        )
+        
+        stateMachine.enter(State.Reloading.self)
+        
+        $links
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] links in
+                guard let self = self else { return }
+                guard let diffableDataSource = self.diffableDataSource else { return }
+                
+                var snapshot = NSDiffableDataSourceSnapshot<DiscoverySection, DiscoveryItem>()
+                snapshot.appendSections([.news])
+                
+                let items = links.map { DiscoveryItem.link($0) }
+                snapshot.appendItems(items, toSection: .news)
+                
+                if let currentState = self.stateMachine.currentState {
+                    switch currentState {
+                    case is State.Initial,
+                        is State.Loading,
+                        is State.Idle,
+                        is State.Fail:
+                        if !items.isEmpty {
+                            snapshot.appendItems([.bottomLoader], toSection: .news)
+                        }
+                    case is State.Reloading:
+                        break
+                    case is State.NoMore:
+                        break
+                    default:
+                        assertionFailure()
+                        break
+                    }
+                }
+                
+                diffableDataSource.applySnapshot(snapshot, animated: false)
+            }
+            .store(in: &disposeBag)
+    }
+    
+}

Mastodon/Scene/Discovery/News/DiscoveryNewsViewModel+State.swift

@@ -0,0 +1,213 @@
+//
+//  DiscoveryNewsViewModel+State.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import os.log
+import Foundation
+import GameplayKit
+import MastodonSDK
+
+extension DiscoveryNewsViewModel {
+    class State: GKState, NamingState {
+        
+        let logger = Logger(subsystem: "DiscoveryNewsViewModel.State", category: "StateMachine")
+
+        let id = UUID()
+
+        var name: String {
+            String(describing: Self.self)
+        }
+        
+        weak var viewModel: DiscoveryNewsViewModel?
+        
+        init(viewModel: DiscoveryNewsViewModel) {
+            self.viewModel = viewModel
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            let previousState = previousState as? DiscoveryNewsViewModel.State
+            logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] enter \(self.name), previous: \(previousState?.name  ?? "<nil>")")
+        }
+        
+        @MainActor
+        func enter(state: State.Type) {
+            stateMachine?.enter(state)
+        }
+        
+        deinit {
+            logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] \(self.name)")
+        }
+    }
+}
+
+extension DiscoveryNewsViewModel.State {
+    class Initial: DiscoveryNewsViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+    }
+    
+    class Reloading: DiscoveryNewsViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let _ = viewModel, let stateMachine = stateMachine else { return }
+            
+            stateMachine.enter(Loading.self)
+        }
+    }
+    
+    class Fail: DiscoveryNewsViewModel.State {
+        
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let _ = viewModel, let stateMachine = stateMachine else { return }
+            
+            os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: retry loading 3s later…", ((#file as NSString).lastPathComponent), #line, #function)
+            DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
+                os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: retry loading", ((#file as NSString).lastPathComponent), #line, #function)
+                stateMachine.enter(Loading.self)
+            }
+        }
+    }
+    
+    class Idle: DiscoveryNewsViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type, is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+    }
+    
+    class Loading: DiscoveryNewsViewModel.State {
+        
+        var offset: Int?
+        
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Fail.Type:
+                return true
+            case is Idle.Type:
+                return true
+            case is NoMore.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
+            
+            
+            switch previousState {
+            case is Reloading:
+                offset = nil
+            default:
+                break
+            }
+
+            guard let authenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
+                stateMachine.enter(Fail.self)
+                return
+            }
+            
+            let offset = self.offset
+            let isReloading = offset == nil
+            
+            Task {
+                do {
+                    let response = try await viewModel.context.apiService.trendLinks(
+                        domain: authenticationBox.domain,
+                        query: Mastodon.API.Trends.StatusQuery(
+                            offset: offset,
+                            limit: nil
+                        )
+                    )
+                    let newOffset: Int? = {
+                        guard let offset = response.link?.offset else { return nil }
+                        return self.offset.flatMap { max($0, offset) } ?? offset
+                    }()
+
+                    let hasMore: Bool = {
+                        guard let newOffset = newOffset else { return false }
+                        return newOffset != self.offset     // not the same one
+                    }()
+
+                    self.offset = newOffset
+
+                    var hasNewItemsAppend = false
+                    var links = isReloading ? [] : viewModel.links
+                    for link in response.value {
+                        guard !links.contains(link) else { continue }
+                        links.append(link)
+                        hasNewItemsAppend = true
+                    }
+
+                    if hasNewItemsAppend, hasMore {
+                        await enter(state: Idle.self)
+                    } else {
+                        await enter(state: NoMore.self)
+                    }
+                    viewModel.links = links
+                    viewModel.didLoadLatest.send()
+                } catch {
+                    logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch news fail: \(error.localizedDescription)")
+                    if let error = error as? Mastodon.API.Error, error.httpResponseStatus.code == 404 {
+                        viewModel.isServerSupportEndpoint = false
+                        await enter(state: NoMore.self)
+                    } else {
+                        await enter(state: Fail.self)
+                    }
+
+                    viewModel.didLoadLatest.send()
+                }
+            }   // end Task
+        }   // end func
+    }
+    
+    class NoMore: DiscoveryNewsViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+        }
+    }
+}

Mastodon/Scene/Discovery/News/DiscoveryNewsViewModel.swift

@@ -0,0 +1,74 @@
+//
+//  DiscoveryNewsViewModel.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-13.
+//
+
+import os.log
+import UIKit
+import Combine
+import GameplayKit
+import CoreData
+import CoreDataStack
+import MastodonSDK
+
+final class DiscoveryNewsViewModel {
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    let listBatchFetchViewModel = ListBatchFetchViewModel()
+
+    // output
+    @Published var links: [Mastodon.Entity.Link] = []
+    var diffableDataSource: UITableViewDiffableDataSource<DiscoverySection, DiscoveryItem>?
+    private(set) lazy var stateMachine: GKStateMachine = {
+        let stateMachine = GKStateMachine(states: [
+            State.Initial(viewModel: self),
+            State.Reloading(viewModel: self),
+            State.Fail(viewModel: self),
+            State.Idle(viewModel: self),
+            State.Loading(viewModel: self),
+            State.NoMore(viewModel: self),
+        ])
+        stateMachine.enter(State.Initial.self)
+        return stateMachine
+    }()
+    
+    let didLoadLatest = PassthroughSubject<Void, Never>()
+    @Published var isServerSupportEndpoint = true
+
+    init(context: AppContext) {
+        self.context = context
+        // end init
+        
+        Task {
+            await checkServerEndpoint()
+        }   // end Task
+    }
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+
+extension DiscoveryNewsViewModel {
+    func checkServerEndpoint() async {
+        guard let authenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return }
+        
+        do {
+            _ = try await context.apiService.trendLinks(
+                domain: authenticationBox.domain,
+                query: .init(offset: nil, limit: nil)
+            )
+        } catch let error as Mastodon.API.Error where error.httpResponseStatus.code == 404 {
+            isServerSupportEndpoint = false
+        } catch {
+            // do nothing
+        }
+    }
+}

Mastodon/Scene/Discovery/Posts/DiscoveryPostsViewController+DataSourceProvider.swift

@@ -0,0 +1,34 @@
+//
+//  DiscoveryPostsViewController+DataSourceProvider.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-12.
+//
+
+import UIKit
+
+extension DiscoveryPostsViewController: DataSourceProvider {
+    func item(from source: DataSourceItem.Source) async -> DataSourceItem? {
+        var _indexPath = source.indexPath
+        if _indexPath == nil, let cell = source.tableViewCell {
+            _indexPath = await self.indexPath(for: cell)
+        }
+        guard let indexPath = _indexPath else { return nil }
+        
+        guard let item = viewModel.diffableDataSource?.itemIdentifier(for: indexPath) else {
+            return nil
+        }
+        
+        switch item {
+        case .status(let record):
+            return .status(record: record)
+        default:
+            return nil
+        }
+    }
+    
+    @MainActor
+    private func indexPath(for cell: UITableViewCell) async -> IndexPath? {
+        return tableView.indexPath(for: cell)
+    }
+}

Mastodon/Scene/Discovery/Posts/DiscoveryPostsViewController.swift

@@ -0,0 +1,190 @@
+//
+//  DiscoveryPostsViewController.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-12.
+//
+
+import os.log
+import UIKit
+import Combine
+import MastodonUI
+
+final class DiscoveryPostsViewController: UIViewController, NeedsDependency, MediaPreviewableViewController {
+    
+    let logger = Logger(subsystem: "TrendPostsViewController", category: "ViewController")
+    
+    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
+    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
+    
+    var disposeBag = Set<AnyCancellable>()
+    var viewModel: DiscoveryPostsViewModel!
+    
+    let mediaPreviewTransitionController = MediaPreviewTransitionController()
+
+    lazy var tableView: UITableView = {
+        let tableView = UITableView()
+        tableView.rowHeight = UITableView.automaticDimension
+        tableView.estimatedRowHeight = 100
+        tableView.separatorStyle = .none
+        tableView.backgroundColor = .clear
+        return tableView
+    }()
+    
+    let refreshControl = UIRefreshControl()
+    
+    let discoveryIntroBannerView = DiscoveryIntroBannerView()
+
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension DiscoveryPostsViewController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        view.backgroundColor = ThemeService.shared.currentTheme.value.secondarySystemBackgroundColor
+        ThemeService.shared.currentTheme
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] theme in
+                guard let self = self else { return }
+                self.view.backgroundColor = theme.secondarySystemBackgroundColor
+            }
+            .store(in: &disposeBag)
+        
+        tableView.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(tableView)
+        NSLayoutConstraint.activate([
+            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+        
+        discoveryIntroBannerView.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(discoveryIntroBannerView)
+        NSLayoutConstraint.activate([
+            discoveryIntroBannerView.topAnchor.constraint(equalTo: view.layoutMarginsGuide.topAnchor),
+            discoveryIntroBannerView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            discoveryIntroBannerView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+        ])
+        
+        discoveryIntroBannerView.delegate = self
+        discoveryIntroBannerView.isHidden = UserDefaults.shared.discoveryIntroBannerNeedsHidden
+        UserDefaults.shared.publisher(for: \.discoveryIntroBannerNeedsHidden)
+            .receive(on: DispatchQueue.main)
+            .assign(to: \.isHidden, on: discoveryIntroBannerView)
+            .store(in: &disposeBag)
+
+        tableView.delegate = self
+        viewModel.setupDiffableDataSource(
+            tableView: tableView,
+            statusTableViewCellDelegate: self
+        )
+        
+        tableView.refreshControl = refreshControl
+        refreshControl.addTarget(self, action: #selector(DiscoveryPostsViewController.refreshControlValueChanged(_:)), for: .valueChanged)
+        viewModel.didLoadLatest
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.refreshControl.endRefreshing()
+            }
+            .store(in: &disposeBag)
+        
+        // setup batch fetch
+        viewModel.listBatchFetchViewModel.setup(scrollView: tableView)
+        viewModel.listBatchFetchViewModel.shouldFetch
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                guard self.view.window != nil else { return }
+                self.viewModel.stateMachine.enter(DiscoveryPostsViewModel.State.Loading.self)
+            }
+            .store(in: &disposeBag)
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        refreshControl.endRefreshing()
+        tableView.deselectRow(with: transitionCoordinator, animated: animated)
+    }
+    
+}
+
+extension DiscoveryPostsViewController {
+    
+    @objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
+        guard viewModel.stateMachine.enter(DiscoveryPostsViewModel.State.Reloading.self) else {
+            sender.endRefreshing()
+            return
+        }
+    }
+    
+}
+
+// MARK: - UITableViewDelegate
+extension DiscoveryPostsViewController: UITableViewDelegate, AutoGenerateTableViewDelegate {
+    // sourcery:inline:DiscoveryPostsViewController.AutoGenerateTableViewDelegate
+
+    // Generated using Sourcery
+    // DO NOT EDIT
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        aspectTableView(tableView, didSelectRowAt: indexPath)
+    }
+
+    func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
+        return aspectTableView(tableView, contextMenuConfigurationForRowAt: indexPath, point: point)
+    }
+
+    func tableView(_ tableView: UITableView, previewForHighlightingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
+        return aspectTableView(tableView, previewForHighlightingContextMenuWithConfiguration: configuration)
+    }
+
+    func tableView(_ tableView: UITableView, previewForDismissingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
+        return aspectTableView(tableView, previewForDismissingContextMenuWithConfiguration: configuration)
+    }
+
+    func tableView(_ tableView: UITableView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
+        aspectTableView(tableView, willPerformPreviewActionForMenuWith: configuration, animator: animator)
+    }
+    // sourcery:end
+}
+
+// MARK: - StatusTableViewCellDelegate
+extension DiscoveryPostsViewController: StatusTableViewCellDelegate { }
+
+// MARK: ScrollViewContainer
+extension DiscoveryPostsViewController: ScrollViewContainer {
+    var scrollView: UIScrollView? {
+        tableView
+    }
+}
+
+// MARK: - DiscoveryIntroBannerViewDelegate
+extension DiscoveryPostsViewController: DiscoveryIntroBannerViewDelegate {
+    func discoveryIntroBannerView(_ bannerView: DiscoveryIntroBannerView, closeButtonDidPressed button: UIButton) {
+        UserDefaults.shared.discoveryIntroBannerNeedsHidden = true
+    }
+}
+
+extension DiscoveryPostsViewController {
+    override var keyCommands: [UIKeyCommand]? {
+        return navigationKeyCommands + statusNavigationKeyCommands
+    }
+}
+
+// MARK: - StatusTableViewControllerNavigateable
+extension DiscoveryPostsViewController: StatusTableViewControllerNavigateable {
+    @objc func navigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
+        navigateKeyCommandHandler(sender)
+    }
+
+    @objc func statusKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
+        statusKeyCommandHandler(sender)
+    }
+}

Mastodon/Scene/Discovery/Posts/DiscoveryPostsViewModel+Diffable.swift

@@ -0,0 +1,65 @@
+//
+//  DiscoveryPostsViewModel+Diffable.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-12.
+//
+
+import UIKit
+import Combine
+
+extension DiscoveryPostsViewModel {
+    
+    func setupDiffableDataSource(
+        tableView: UITableView,
+        statusTableViewCellDelegate: StatusTableViewCellDelegate
+    ) {
+        diffableDataSource = StatusSection.diffableDataSource(
+            tableView: tableView,
+            context: context,
+            configuration: StatusSection.Configuration(
+                statusTableViewCellDelegate: statusTableViewCellDelegate,
+                timelineMiddleLoaderTableViewCellDelegate: nil,
+                filterContext: .none,
+                activeFilters: nil
+            )
+        )
+        
+        stateMachine.enter(State.Reloading.self)
+        
+        statusFetchedResultsController.$records
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] records in
+                guard let self = self else { return }
+                guard let diffableDataSource = self.diffableDataSource else { return }
+                
+                var snapshot = NSDiffableDataSourceSnapshot<StatusSection, StatusItem>()
+                snapshot.appendSections([.main])
+                
+                let items = records.map { StatusItem.status(record: $0) }
+                snapshot.appendItems(items, toSection: .main)
+                
+                if let currentState = self.stateMachine.currentState {
+                    switch currentState {
+                    case is State.Initial,
+                        is State.Reloading,
+                        is State.Loading,
+                        is State.Idle,
+                        is State.Fail:
+                        if !items.isEmpty {
+                            snapshot.appendItems([.bottomLoader], toSection: .main)
+                        }
+                    case is State.NoMore:
+                        break
+                    default:
+                        assertionFailure()
+                        break
+                    }
+                }
+            
+                diffableDataSource.applySnapshot(snapshot, animated: false)
+            }
+            .store(in: &disposeBag)
+    }
+    
+}

Mastodon/Scene/Discovery/Posts/DiscoveryPostsViewModel+State.swift

@@ -0,0 +1,213 @@
+//
+//  DiscoveryPostsViewModel+State.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-12.
+//
+
+import os.log
+import Foundation
+import GameplayKit
+import MastodonSDK
+
+extension DiscoveryPostsViewModel {
+    class State: GKState, NamingState {
+        
+        let logger = Logger(subsystem: "DiscoveryPostsViewModel.State", category: "StateMachine")
+
+        let id = UUID()
+
+        var name: String {
+            String(describing: Self.self)
+        }
+        
+        weak var viewModel: DiscoveryPostsViewModel?
+        
+        init(viewModel: DiscoveryPostsViewModel) {
+            self.viewModel = viewModel
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            let previousState = previousState as? DiscoveryPostsViewModel.State
+            logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] enter \(self.name), previous: \(previousState?.name  ?? "<nil>")")
+        }
+        
+        @MainActor
+        func enter(state: State.Type) {
+            stateMachine?.enter(state)
+        }
+        
+        deinit {
+            logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] \(self.name)")
+        }
+    }
+}
+
+extension DiscoveryPostsViewModel.State {
+    class Initial: DiscoveryPostsViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+    }
+    
+    class Reloading: DiscoveryPostsViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let _ = viewModel, let stateMachine = stateMachine else { return }
+
+            stateMachine.enter(Loading.self)
+        }
+    }
+    
+    class Fail: DiscoveryPostsViewModel.State {
+        
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let _ = viewModel, let stateMachine = stateMachine else { return }
+            
+            os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: retry loading 3s later…", ((#file as NSString).lastPathComponent), #line, #function)
+            DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
+                os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: retry loading", ((#file as NSString).lastPathComponent), #line, #function)
+                stateMachine.enter(Loading.self)
+            }
+        }
+    }
+    
+    class Idle: DiscoveryPostsViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type, is Loading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+    }
+    
+    class Loading: DiscoveryPostsViewModel.State {
+        
+        var offset: Int?
+        
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Fail.Type:
+                return true
+            case is Idle.Type:
+                return true
+            case is NoMore.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+            guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
+            
+            switch previousState {
+            case is Reloading:
+                offset = nil
+            default:
+                break
+            }
+
+            guard let authenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
+                stateMachine.enter(Fail.self)
+                return
+            }
+            
+            let offset = self.offset
+            let isReloading = offset == nil
+            
+            Task {
+                do {
+                    let response = try await viewModel.context.apiService.trendStatuses(
+                        domain: authenticationBox.domain,
+                        query: Mastodon.API.Trends.StatusQuery(
+                            offset: offset,
+                            limit: nil
+                        )
+                    )
+                    let newOffset: Int? = {
+                        guard let offset = response.link?.offset else { return nil }
+                        return self.offset.flatMap { max($0, offset) } ?? offset
+                    }()
+                    
+                    let hasMore: Bool = {
+                        guard let newOffset = newOffset else { return false }
+                        return newOffset != self.offset     // not the same one
+                    }()
+                    
+                    self.offset = newOffset
+
+                    var hasNewStatusesAppend = false
+                    var statusIDs = isReloading ? [] : viewModel.statusFetchedResultsController.statusIDs.value
+                    for status in response.value {
+                        guard !statusIDs.contains(status.id) else { continue }
+                        statusIDs.append(status.id)
+                        hasNewStatusesAppend = true
+                    }
+
+                    if hasNewStatusesAppend, hasMore {
+                        await enter(state: Idle.self)
+                    } else {
+                        await enter(state: NoMore.self)
+                    }
+                    viewModel.statusFetchedResultsController.statusIDs.value = statusIDs
+                    viewModel.didLoadLatest.send()
+                    
+                } catch {
+                    logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch posts fail: \(error.localizedDescription)")
+                    if let error = error as? Mastodon.API.Error, error.httpResponseStatus.code == 404 {
+                        viewModel.isServerSupportEndpoint = false
+                        await enter(state: NoMore.self)
+                    } else {
+                        await enter(state: Fail.self)
+                    }
+                    
+                    viewModel.didLoadLatest.send()
+                }
+            }   // end Task
+        }   // end func
+    }
+    
+    class NoMore: DiscoveryPostsViewModel.State {
+        override func isValidNextState(_ stateClass: AnyClass) -> Bool {
+            switch stateClass {
+            case is Reloading.Type:
+                return true
+            default:
+                return false
+            }
+        }
+        
+        override func didEnter(from previousState: GKState?) {
+            super.didEnter(from: previousState)
+        }
+    }
+}

Mastodon/Scene/Discovery/Posts/DiscoveryPostsViewModel.swift

@@ -0,0 +1,83 @@
+//
+//  DiscoveryPostsViewModel.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-12.
+//
+
+import os.log
+import UIKit
+import Combine
+import GameplayKit
+import CoreData
+import CoreDataStack
+import MastodonSDK
+
+final class DiscoveryPostsViewModel {
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    let statusFetchedResultsController: StatusFetchedResultsController
+    let listBatchFetchViewModel = ListBatchFetchViewModel()
+    
+    // output
+    var diffableDataSource: UITableViewDiffableDataSource<StatusSection, StatusItem>?
+    private(set) lazy var stateMachine: GKStateMachine = {
+        let stateMachine = GKStateMachine(states: [
+            State.Initial(viewModel: self),
+            State.Reloading(viewModel: self),
+            State.Fail(viewModel: self),
+            State.Idle(viewModel: self),
+            State.Loading(viewModel: self),
+            State.NoMore(viewModel: self),
+        ])
+        stateMachine.enter(State.Initial.self)
+        return stateMachine
+    }()
+    
+    let didLoadLatest = PassthroughSubject<Void, Never>()
+    @Published var isServerSupportEndpoint = true
+    
+    init(context: AppContext) {
+        self.context = context
+        self.statusFetchedResultsController = StatusFetchedResultsController(
+            managedObjectContext: context.managedObjectContext,
+            domain: nil,
+            additionalTweetPredicate: nil
+        )
+        // end init
+        
+        context.authenticationService.activeMastodonAuthentication
+            .map { $0?.domain }
+            .assign(to: \.value, on: statusFetchedResultsController.domain)
+            .store(in: &disposeBag)
+        
+        Task {
+            await checkServerEndpoint()
+        }   // end Task
+    }
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension DiscoveryPostsViewModel {
+    func checkServerEndpoint() async {
+        guard let authenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return }
+        
+        do {
+            _ = try await context.apiService.trendStatuses(
+                domain: authenticationBox.domain,
+                query: .init(offset: nil, limit: nil)
+            )
+        } catch let error as Mastodon.API.Error where error.httpResponseStatus.code == 404 {
+            isServerSupportEndpoint = false
+        } catch {
+            // do nothing
+        }
+    }
+}

Mastodon/Scene/Discovery/View/DiscoveryIntroBannerView.swift

@@ -0,0 +1,102 @@
+//
+//  DiscoveryIntroBannerView.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-19.
+//
+
+import os.log
+import UIKit
+import Combine
+import MastodonAsset
+import MastodonLocalization
+
+public protocol DiscoveryIntroBannerViewDelegate: AnyObject {
+    func discoveryIntroBannerView(_ bannerView: DiscoveryIntroBannerView, closeButtonDidPressed button: UIButton)
+}
+
+public final class DiscoveryIntroBannerView: UIView {
+    
+    let logger = Logger(subsystem: "DiscoveryIntroBannerView", category: "View")
+    
+    var _disposeBag = Set<AnyCancellable>()
+    
+    public weak var delegate: DiscoveryIntroBannerViewDelegate?
+    
+    let label: UILabel = {
+        let label = UILabel()
+        label.font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: .systemFont(ofSize: 16, weight: .regular))
+        label.textColor = Asset.Colors.Label.primary.color
+        label.text = L10n.Scene.Discovery.intro
+        label.numberOfLines = 0
+        return label
+    }()
+    
+    let closeButton: HitTestExpandedButton = {
+        let button = HitTestExpandedButton(type: .system)
+        button.setImage(UIImage(systemName: "xmark.circle.fill"), for: .normal)
+        button.tintColor = Asset.Colors.Label.secondary.color
+        return button
+    }()
+    
+    public override init(frame: CGRect) {
+        super.init(frame: frame)
+        _init()
+    }
+    
+    public required init?(coder: NSCoder) {
+        super.init(coder: coder)
+        _init()
+    }
+    
+}
+
+extension DiscoveryIntroBannerView {
+    private func _init() {
+        preservesSuperviewLayoutMargins = true
+        
+        setupAppearance(theme: ThemeService.shared.currentTheme.value)
+        ThemeService.shared.currentTheme
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] theme in
+                guard let self = self else { return }
+                self.setupAppearance(theme: theme)
+            }
+            .store(in: &_disposeBag)
+        
+        closeButton.translatesAutoresizingMaskIntoConstraints = false
+        addSubview(closeButton)
+        NSLayoutConstraint.activate([
+            closeButton.topAnchor.constraint(equalTo: topAnchor, constant: 16).priority(.required - 1),
+            layoutMarginsGuide.trailingAnchor.constraint(equalTo: closeButton.trailingAnchor),
+            closeButton.heightAnchor.constraint(equalToConstant: 20).priority(.required - 1),
+            closeButton.widthAnchor.constraint(equalToConstant: 20).priority(.required - 1),
+        ])
+        
+        label.translatesAutoresizingMaskIntoConstraints = false
+        addSubview(label)
+        NSLayoutConstraint.activate([
+            label.topAnchor.constraint(equalTo: topAnchor, constant: 16).priority(.required - 1),
+            label.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor),
+            closeButton.leadingAnchor.constraint(equalTo: label.trailingAnchor, constant: 10),
+            bottomAnchor.constraint(equalTo: label.bottomAnchor, constant: 16).priority(.required - 1),
+        ])
+        
+        closeButton.addTarget(self, action: #selector(DiscoveryIntroBannerView.closeButtonDidPressed(_:)), for: .touchUpInside)
+    }
+}
+
+extension DiscoveryIntroBannerView {
+    @objc private func closeButtonDidPressed(_ sender: UIButton) {
+        logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
+        delegate?.discoveryIntroBannerView(self, closeButtonDidPressed: sender)
+    }
+}
+
+extension DiscoveryIntroBannerView {
+    
+    private func setupAppearance(theme: Theme) {
+        backgroundColor = theme.systemBackgroundColor
+    }
+    
+}

Mastodon/Scene/HashtagTimeline/HashtagTimelineViewController.swift

@@ -28,7 +28,7 @@ final class HashtagTimelineViewController: UIViewController, NeedsDependency, Me
         
     let composeBarButtonItem: UIBarButtonItem = {
         let barButtonItem = UIBarButtonItem()
-        barButtonItem.image = UIImage(systemName: "square.and.pencil")?.withRenderingMode(.alwaysTemplate)
+        barButtonItem.image = Asset.ObjectsAndTools.squareAndPencil.image.withRenderingMode(.alwaysTemplate)
         return barButtonItem
     }()
     
@@ -84,7 +84,6 @@ extension HashtagTimelineViewController {
         ])
 
         tableView.delegate = self
-//        tableView.prefetchDataSource = self
         viewModel.setupDiffableDataSource(
             tableView: tableView,
             statusTableViewCellDelegate: self
@@ -158,27 +157,6 @@ extension HashtagTimelineViewController {
 
 }
 
-// MARK: - TableViewCellHeightCacheableContainer
-//extension HashtagTimelineViewController: TableViewCellHeightCacheableContainer {
-//    var cellFrameCache: NSCache<NSNumber, NSValue> {
-//        return viewModel.cellFrameCache
-//    }
-//}
-
-//// MARK: - UIScrollViewDelegate
-//extension HashtagTimelineViewController {
-//    func scrollViewDidScroll(_ scrollView: UIScrollView) {
-//        aspectScrollViewDidScroll(scrollView)
-//    }
-//}
-
-//extension HashtagTimelineViewController: LoadMoreConfigurableTableViewContainer {
-//    typealias BottomLoaderTableViewCell = TimelineBottomLoaderTableViewCell
-//    typealias LoadingState = HashtagTimelineViewModel.LoadOldestState.Loading
-//    var loadMoreConfigurableTableView: UITableView { return tableView }
-//    var loadMoreConfigurableStateMachine: GKStateMachine { return viewModel.loadOldestStateMachine }
-//}
-
 // MARK: - UITableViewDelegate
 extension HashtagTimelineViewController: UITableViewDelegate, AutoGenerateTableViewDelegate {
     // sourcery:inline:HashtagTimelineViewController.AutoGenerateTableViewDelegate
@@ -206,82 +184,23 @@ extension HashtagTimelineViewController: UITableViewDelegate, AutoGenerateTableV
     }
     // sourcery:end
     
-//    func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
-//        return aspectTableView(tableView, estimatedHeightForRowAt: indexPath)
-//    }
-//
-//    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
-//        aspectTableView(tableView, willDisplay: cell, forRowAt: indexPath)
-//    }
-//
-//    func tableView(_ tableView: UITableView, didEndDisplaying cell: UITableViewCell, forRowAt indexPath: IndexPath) {
-//        aspectTableView(tableView, didEndDisplaying: cell, forRowAt: indexPath)
-//    }
-//
-//    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
-//        aspectTableView(tableView, didSelectRowAt: indexPath)
-//    }
-//
-//    func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
-//        return aspectTableView(tableView, contextMenuConfigurationForRowAt: indexPath, point: point)
-//    }
-//
-//    func tableView(_ tableView: UITableView, previewForHighlightingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
-//        return aspectTableView(tableView, previewForHighlightingContextMenuWithConfiguration: configuration)
-//    }
-//
-//    func tableView(_ tableView: UITableView, previewForDismissingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
-//        return aspectTableView(tableView, previewForDismissingContextMenuWithConfiguration: configuration)
-//    }
-//
-//    func tableView(_ tableView: UITableView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
-//        aspectTableView(tableView, willPerformPreviewActionForMenuWith: configuration, animator: animator)
-//    }
-    
 }
 
-// MARK: - UITableViewDataSourcePrefetching
-//extension HashtagTimelineViewController: UITableViewDataSourcePrefetching {
-//    func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
-//        aspectTableView(tableView, prefetchRowsAt: indexPaths)
-//    }
-//}
-
 // MARK: - StatusTableViewCellDelegate
 extension HashtagTimelineViewController: StatusTableViewCellDelegate { }
 
-// MARK: - AVPlayerViewControllerDelegate
+extension HashtagTimelineViewController {
-//extension HashtagTimelineViewController: AVPlayerViewControllerDelegate {
+    override var keyCommands: [UIKeyCommand]? {
-//
+        return navigationKeyCommands + statusNavigationKeyCommands
-//    func playerViewController(_ playerViewController: AVPlayerViewController, willBeginFullScreenPresentationWithAnimationCoordinator coordinator: UIViewControllerTransitionCoordinator) {
+    }
-//        aspectPlayerViewController(playerViewController, willBeginFullScreenPresentationWithAnimationCoordinator: coordinator)
+}
-//    }
+// MARK: - StatusTableViewControllerNavigateable
-//
+extension HashtagTimelineViewController: StatusTableViewControllerNavigateable {
-//    func playerViewController(_ playerViewController: AVPlayerViewController, willEndFullScreenPresentationWithAnimationCoordinator coordinator: UIViewControllerTransitionCoordinator) {
+    @objc func navigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
-//        aspectPlayerViewController(playerViewController, willEndFullScreenPresentationWithAnimationCoordinator: coordinator)
+        navigateKeyCommandHandler(sender)
-//    }
+    }
-//
+    
-//}
+    @objc func statusKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
-
+        statusKeyCommandHandler(sender)
-// MARK: - StatusTableViewCellDelegate
+    }
-//extension HashtagTimelineViewController: StatusTableViewCellDelegate {
+}
-//    weak var playerViewControllerDelegate: AVPlayerViewControllerDelegate? { return self }
-//    func parent() -> UIViewController { return self }
-//}
-
-//extension HashtagTimelineViewController {
-//    override var keyCommands: [UIKeyCommand]? {
-//        return navigationKeyCommands + statusNavigationKeyCommands
-//    }
-//}
-//
-//// MARK: - StatusTableViewControllerNavigateable
-//extension HashtagTimelineViewController: StatusTableViewControllerNavigateable {
-//    @objc func navigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
-//        navigateKeyCommandHandler(sender)
-//    }
-//    
-//    @objc func statusKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
-//        statusKeyCommandHandler(sender)
-//    }
-//}

Mastodon/Scene/HomeTimeline/HomeTimelineViewController+DebugAction.swift

@@ -58,6 +58,10 @@ extension HomeTimelineViewController {
                     guard let self = self else { return }
                     self.showWelcomeAction(action)
                 },
+                UIAction(title: "Register", image: UIImage(systemName: "list.bullet.rectangle.portrait.fill"), attributes: []) { [weak self] action in
+                    guard let self = self else { return }
+                    self.showRegisterAction(action)
+                },
                 UIAction(title: "Confirm Email", image: UIImage(systemName: "envelope"), attributes: []) { [weak self] action in
                     guard let self = self else { return }
                     self.showConfirmEmail(action)
@@ -182,7 +186,7 @@ extension HomeTimelineViewController {
         }
         
         func match(item: StatusItem) -> Bool {
-            let authenticationBox = AppContext.shared.authenticationService.activeMastodonAuthenticationBox.value
+            // let authenticationBox = AppContext.shared.authenticationService.activeMastodonAuthenticationBox.value
             switch item {
             case .feed(let record):
                 guard let feed = record.object(in: AppContext.shared.managedObjectContext) else { return false }
@@ -294,6 +298,33 @@ extension HomeTimelineViewController {
     @objc private func showWelcomeAction(_ sender: UIAction) {
         coordinator.present(scene: .welcome, from: self, transition: .modal(animated: true, completion: nil))
     }
+    
+    @objc private func showRegisterAction(_ sender: UIAction) {
+        Task { @MainActor in
+            try await showRegisterController()
+        }   // end Task
+    }
+    
+    @MainActor
+    func showRegisterController(domain: String = "mstdn.jp") async throws {
+        let viewController = try await MastodonRegisterViewController.create(
+            context: context,
+            coordinator: coordinator,
+            domain: "mstdn.jp"
+        )
+        let navigationController = UINavigationController(rootViewController: viewController)
+        navigationController.modalPresentationStyle = .fullScreen
+        present(navigationController, animated: true) {
+            viewController.navigationItem.leftBarButtonItem = UIBarButtonItem(
+                systemItem: .close,
+                primaryAction: UIAction(handler: { [weak viewController] _ in
+                    guard let viewController = viewController else { return }
+                    viewController.dismiss(animated: true)
+                }),
+                menu: nil
+            )
+        }
+    }
 
     @objc private func showConfirmEmail(_ sender: UIAction) {
         let mastodonConfirmEmailViewModel = MastodonConfirmEmailViewModel()

Mastodon/Scene/HomeTimeline/HomeTimelineViewController.swift

@@ -17,6 +17,7 @@ import AlamofireImage
 import StoreKit
 import MastodonAsset
 import MastodonLocalization
+import MastodonUI
 
 final class HomeTimelineViewController: UIViewController, NeedsDependency, MediaPreviewableViewController {
     
@@ -50,19 +51,11 @@ final class HomeTimelineViewController: UIViewController, NeedsDependency, Media
     let settingBarButtonItem: UIBarButtonItem = {
         let barButtonItem = UIBarButtonItem()
         barButtonItem.tintColor = ThemeService.tintColor
-        barButtonItem.image = UIImage(systemName: "gear")?.withRenderingMode(.alwaysTemplate)
+        barButtonItem.image = Asset.ObjectsAndTools.gear.image.withRenderingMode(.alwaysTemplate)
         barButtonItem.accessibilityLabel = L10n.Common.Controls.Actions.settings
         return barButtonItem
     }()
     
-    let composeBarButtonItem: UIBarButtonItem = {
-        let barButtonItem = UIBarButtonItem()
-        barButtonItem.tintColor = ThemeService.tintColor
-        barButtonItem.image = UIImage(systemName: "square.and.pencil")?.withRenderingMode(.alwaysTemplate)
-        barButtonItem.accessibilityLabel = L10n.Common.Controls.Actions.compose
-        return barButtonItem
-    }()
-    
     let tableView: UITableView = {
         let tableView = ControlContainableTableView()
         tableView.register(StatusTableViewCell.self, forCellReuseIdentifier: String(describing: StatusTableViewCell.self))
@@ -108,14 +101,14 @@ extension HomeTimelineViewController {
                 guard let self = self else { return }
                 #if DEBUG
                 // display debug menu
-                self.navigationItem.leftBarButtonItem = {
+                self.navigationItem.rightBarButtonItem = {
                     let barButtonItem = UIBarButtonItem()
                     barButtonItem.image = UIImage(systemName: "ellipsis.circle")
                     barButtonItem.menu = self.debugMenu
                     return barButtonItem
                 }()
                 #else
-                self.navigationItem.leftBarButtonItem = displaySettingBarButtonItem ? self.settingBarButtonItem : nil
+                self.navigationItem.rightBarButtonItem = displaySettingBarButtonItem ? self.settingBarButtonItem : nil
                 #endif
             }
             .store(in: &disposeBag)
@@ -132,16 +125,6 @@ extension HomeTimelineViewController {
         titleView.button.menu = self.debugMenu
         #endif
         
-        viewModel.$displayComposeBarButtonItem
-            .receive(on: DispatchQueue.main)
-            .sink { [weak self] displayComposeBarButtonItem in
-                guard let self = self else { return }
-                self.navigationItem.rightBarButtonItem = displayComposeBarButtonItem ? self.composeBarButtonItem : nil
-            }
-            .store(in: &disposeBag)
-        composeBarButtonItem.target = self
-        composeBarButtonItem.action = #selector(HomeTimelineViewController.composeBarButtonItemPressed(_:))
-        
         navigationItem.titleView = titleView
         titleView.delegate = self
         
@@ -291,7 +274,7 @@ extension HomeTimelineViewController {
         tableView.deselectRow(with: transitionCoordinator, animated: animated)
         
         // needs trigger manually after onboarding dismiss
-         setNeedsStatusBarAppearanceUpdate()
+        setNeedsStatusBarAppearanceUpdate()
     }
 
     override func viewDidAppear(_ animated: Bool) {
@@ -410,18 +393,7 @@ extension HomeTimelineViewController {
         let settingsViewModel = SettingsViewModel(context: context, setting: setting)
         coordinator.present(scene: .settings(viewModel: settingsViewModel), from: self, transition: .modal(animated: true, completion: nil))
     }
-    
+
-    @objc private func composeBarButtonItemPressed(_ sender: UIBarButtonItem) {
-        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
-        guard let authenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return }
-        let composeViewModel = ComposeViewModel(
-            context: context,
-            composeKind: .post,
-            authenticationBox: authenticationBox
-        )
-        coordinator.present(scene: .compose(viewModel: composeViewModel), from: self, transition: .modal(animated: true, completion: nil))
-    }
-    
     @objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
         guard viewModel.loadLatestStateMachine.enter(HomeTimelineViewModel.LoadLatestState.Loading.self) else {
             sender.endRefreshing()

Mastodon/Scene/HomeTimeline/HomeTimelineViewModel.swift

@@ -33,7 +33,6 @@ final class HomeTimelineViewModel: NSObject {
     @Published var lastAutomaticFetchTimestamp: Date? = nil
     @Published var scrollPositionRecord: ScrollPositionRecord? = nil
     @Published var displaySettingBarButtonItem = true
-    @Published var displayComposeBarButtonItem = true
     
     weak var tableView: UITableView?
     weak var timelineMiddleLoaderTableViewCellDelegate: TimelineMiddleLoaderTableViewCellDelegate?

Mastodon/Scene/HomeTimeline/View/HomeTimelineNavigationBarTitleView.swift

@@ -108,6 +108,8 @@ extension HomeTimelineNavigationBarTitleView {
             logoButton.setImage(Asset.Asset.mastodonTextLogo.image.withRenderingMode(.alwaysTemplate), for: .normal)
             logoButton.contentMode = .center
             logoButton.isHidden = false
+            logoButton.accessibilityLabel = "Logo Button"   // TODO :i18n
+            logoButton.accessibilityHint = "Tap to scroll to top and tap again to previous location"
         case .newPostButton:
             configureButton(
                 title: L10n.Scene.HomeTimeline.NavigationBarState.newPosts,
@@ -115,6 +117,7 @@ extension HomeTimelineNavigationBarTitleView {
                 backgroundColor: Asset.Colors.brandBlue.color
             )
             button.isHidden = false
+            button.accessibilityLabel = L10n.Scene.HomeTimeline.NavigationBarState.newPosts
         case .offlineButton:
             configureButton(
                 title: L10n.Scene.HomeTimeline.NavigationBarState.offline,
@@ -122,12 +125,14 @@ extension HomeTimelineNavigationBarTitleView {
                 backgroundColor: Asset.Colors.danger.color
             )
             button.isHidden = false
+            button.accessibilityLabel = L10n.Scene.HomeTimeline.NavigationBarState.offline
         case .publishingPostLabel:
             label.font = .systemFont(ofSize: 17, weight: .semibold)
             label.textColor = Asset.Colors.Label.primary.color
             label.text = L10n.Scene.HomeTimeline.NavigationBarState.publishing
             label.textAlignment = .center
             label.isHidden = false
+            button.accessibilityLabel = L10n.Scene.HomeTimeline.NavigationBarState.publishing
         case .publishedButton:
             blockingState = state
             configureButton(
@@ -136,6 +141,7 @@ extension HomeTimelineNavigationBarTitleView {
                 backgroundColor: Asset.Colors.successGreen.color
             )
             button.isHidden = false
+            button.accessibilityLabel = L10n.Scene.HomeTimeline.NavigationBarState.published
             
             let presentDuration: TimeInterval = 0.33
             let scaleAnimator = UIViewPropertyAnimator(duration: presentDuration, timingParameters: UISpringTimingParameters())

Mastodon/Scene/Notification/NotificationTimeline/NotificationTimelineViewController.swift

@@ -39,6 +39,8 @@ final class NotificationTimelineViewController: UIViewController, NeedsDependenc
         return tableView
     }()
     
+    let cellFrameCache = NSCache<NSNumber, NSValue>()
+
     deinit {
         os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
     }
@@ -122,6 +124,16 @@ extension NotificationTimelineViewController {
     
 }
 
+// MARK: - CellFrameCacheContainer
+extension NotificationTimelineViewController: CellFrameCacheContainer {
+    func keyForCache(tableView: UITableView, indexPath: IndexPath) -> NSNumber? {
+        guard let diffableDataSource = viewModel.diffableDataSource else { return nil }
+        guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return nil }
+        let key = NSNumber(value: item.hashValue)
+        return key
+    }
+}
+
 extension NotificationTimelineViewController {
 
     @objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
@@ -162,6 +174,13 @@ extension NotificationTimelineViewController: UITableViewDelegate, AutoGenerateT
 
     // sourcery:end
     
+    func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
+        guard let frame = retrieveCellFrame(tableView: tableView, indexPath: indexPath) else {
+            return 300
+        }
+        return ceil(frame.height)
+    }
+    
     func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
         guard let item = viewModel.diffableDataSource?.itemIdentifier(for: indexPath) else {
             return
@@ -172,6 +191,10 @@ extension NotificationTimelineViewController: UITableViewDelegate, AutoGenerateT
             await viewModel.loadMore(item: item)
         }
     }
+
+    func tableView(_ tableView: UITableView, didEndDisplaying cell: UITableViewCell, forRowAt indexPath: IndexPath) {
+        cacheCellFrame(tableView: tableView, didEndDisplaying: cell, forRowAt: indexPath)
+    }
     
 }
 

Mastodon/Scene/Onboarding/ConfirmEmail/MastodonConfirmEmailViewController.swift

@@ -229,6 +229,11 @@ extension MastodonConfirmEmailViewController {
     }
 }
 
+// MARK: - PanPopableViewController
+extension MastodonConfirmEmailViewController: PanPopableViewController {
+    var isPanPopable: Bool { false }
+}
+
 // MARK: - OnboardingViewControllerAppearance
 extension MastodonConfirmEmailViewController: OnboardingViewControllerAppearance { }
 

Mastodon/Scene/Onboarding/PickServer/MastodonPickServerViewController.swift

@@ -12,6 +12,7 @@ import GameController
 import AuthenticationServices
 import MastodonAsset
 import MastodonLocalization
+import MastodonUI
 
 final class MastodonPickServerViewController: UIViewController, NeedsDependency {
     
@@ -91,7 +92,7 @@ extension MastodonPickServerViewController {
             tableView.topAnchor.constraint(equalTo: view.topAnchor),
             tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
             tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
-            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.layoutMarginsGuide.bottomAnchor),
         ])
         
         navigationActionView.translatesAutoresizingMaskIntoConstraints = false
@@ -106,10 +107,10 @@ extension MastodonPickServerViewController {
         ])
         
         navigationActionView
-            .observe(\.bounds, options: [.initial, .new]) { [weak self] navigationActionView, _ in
+            .observe(\.bounds, options: [.initial, .new]) { [weak self] _, _ in
                 guard let self = self else { return }
-                let inset = navigationActionView.frame.height
+                let inset = self.navigationActionView.frame.height
-                self.tableView.contentInset.bottom = inset
+                self.viewModel.additionalTableViewInsets.bottom = inset
             }
             .store(in: &observations)
 
@@ -144,6 +145,14 @@ extension MastodonPickServerViewController {
             pickServerServerSectionTableHeaderViewDelegate: self,
             pickServerCellDelegate: self
         )
+        
+        KeyboardResponderService
+            .configure(
+                scrollView: tableView,
+                layoutNeedsUpdate: viewModel.viewDidAppear.eraseToAnyPublisher(),
+                additionalSafeAreaInsets: viewModel.$additionalTableViewInsets.eraseToAnyPublisher()
+            )
+            .store(in: &disposeBag)
 
         viewModel
             .selectedServer
@@ -238,6 +247,7 @@ extension MastodonPickServerViewController {
         super.viewDidAppear(animated)
         
         tableView.flashScrollIndicators()
+        viewModel.viewDidAppear.send()
     }
     
     override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
@@ -332,7 +342,10 @@ extension MastodonPickServerViewController {
                 ) else {
                     throw APIService.APIError.explicit(.badResponse)
                 }
-                return MastodonPickServerViewModel.SignUpResponseSecond(instance: response.instance, authenticateInfo: authenticateInfo)
+                return MastodonPickServerViewModel.SignUpResponseSecond(
+                    instance: response.instance,
+                    authenticateInfo: authenticateInfo
+                )
             }
             .compactMap { [weak self] response -> AnyPublisher<MastodonPickServerViewModel.SignUpResponseThird, Error>? in
                 guard let self = self else { return nil }
@@ -344,7 +357,13 @@ extension MastodonPickServerViewController {
                     clientSecret: authenticateInfo.clientSecret,
                     redirectURI: authenticateInfo.redirectURI
                 )
-                .map { MastodonPickServerViewModel.SignUpResponseThird(instance: instance, authenticateInfo: authenticateInfo, applicationToken: $0) }
+                .map {
+                    MastodonPickServerViewModel.SignUpResponseThird(
+                        instance: instance,
+                        authenticateInfo: authenticateInfo,
+                        applicationToken: $0
+                    )
+                }
                 .eraseToAnyPublisher()
             }
             .switchToLatest()
@@ -416,28 +435,6 @@ extension MastodonPickServerViewController: UITableViewDelegate {
         viewModel.selectedServer.send(nil)
     }
     
-    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
-        guard let diffableDataSource = viewModel.diffableDataSource else { return }
-        guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return }
-        
-        switch item {
-//        case .categoryPicker:
-//            guard let cell = cell as? PickServerCategoriesCell else { return }
-//            guard let diffableDataSource = cell.diffableDataSource else { return }
-//            let snapshot = diffableDataSource.snapshot()
-//
-//            let item = viewModel.selectCategoryItem.value
-//            guard let section = snapshot.indexOfSection(.main),
-//                  let row = snapshot.indexOfItem(item) else { return }
-//            cell.collectionView.selectItem(at: IndexPath(item: row, section: section), animated: false, scrollPosition: .centeredHorizontally)
-//        case .search:
-//            guard let cell = cell as? PickServerSearchCell else { return }
-//            cell.searchTextField.text = viewModel.searchText.value
-        default:
-            break
-        }
-    }
-    
     func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
         guard let diffableDataSource = viewModel.diffableDataSource else { return nil }
         let snapshot = diffableDataSource.snapshot()

Mastodon/Scene/Onboarding/PickServer/MastodonPickServerViewModel.swift

@@ -45,6 +45,8 @@ class MastodonPickServerViewModel: NSObject {
     let indexedServers = CurrentValueSubject<[Mastodon.Entity.Server], Never>([])
     let unindexedServers = CurrentValueSubject<[Mastodon.Entity.Server]?, Never>([])    // set nil when loading
     let viewWillAppear = PassthroughSubject<Void, Never>()
+    let viewDidAppear = CurrentValueSubject<Void, Never>(Void())
+    @Published var additionalTableViewInsets: UIEdgeInsets = .zero
     
     // output
     var diffableDataSource: UITableViewDiffableDataSource<PickServerSection, PickServerItem>?
@@ -114,8 +116,11 @@ extension MastodonPickServerViewModel {
             if self.mode == .signUp {
                 indexedServers = indexedServers.filter { !$0.approvalRequired }
             }
+            // Note:
+            // sort by calculate last week users count
+            // and make medium size (~800) server to top
             
-            // group by language user preferred language first. Then sort by `totalUsers`
+            // group by language user preferred language first
             var languageToServersMapping = OrderedDictionary<String, [Mastodon.Entity.Server]>()
             for language in Locale.preferredLanguages {
                 let local = Locale(identifier: language)
@@ -125,14 +130,22 @@ extension MastodonPickServerViewModel {
                 // append to dict
                 languageToServersMapping[languageCode] = indexedServers
                     .filter { $0.language.lowercased() == languageCode.lowercased() }
-                    .sorted(by: { $0.totalUsers > $1.totalUsers })
+                    .sorted(by: { lh, rh in
+                        let lhValue = abs(log2(800.0) - log2(Double(lh.lastWeekUsers)))
+                        let rhValue = abs(log2(800.0) - log2(Double(rh.lastWeekUsers)))
+                        return lhValue < rhValue
+                    })
             }
-            // sort remains servers by `totalUsers`
+            // sort remains servers
             let remainsServers = indexedServers
                 .filter { server in
                     return !languageToServersMapping.contains { _, servers in servers.contains(server) }
                 }
-                .sorted(by: { $0.totalUsers > $1.totalUsers })
+                .sorted(by: { lh, rh in
+                    let lhValue = abs(log2(800.0) - log2(Double(lh.lastWeekUsers)))
+                    let rhValue = abs(log2(800.0) - log2(Double(rh.lastWeekUsers)))
+                    return lhValue < rhValue
+                })
             
             var _indexedServers: [Mastodon.Entity.Server] = []
             for key in languageToServersMapping.keys {

Mastodon/Scene/Onboarding/PickServer/View/PickServerServerSectionTableHeaderView.swift

@@ -185,12 +185,12 @@ extension PickServerServerSectionTableHeaderView {
 
     override func accessibilityElementCount() -> Int {
         guard let diffableDataSource = diffableDataSource else { return 0 }
-        return diffableDataSource.snapshot().itemIdentifiers.count
+        return diffableDataSource.snapshot().itemIdentifiers.count + 1
     }
 
     override func accessibilityElement(at index: Int) -> Any? {
-        guard let item = collectionView.cellForItem(at: IndexPath(item: index, section: 0)) else { return nil }
+        if let item = collectionView.cellForItem(at: IndexPath(item: index, section: 0)) { return item }
-        return item
+        return searchTextField
     }
 
 }

Mastodon/Scene/Onboarding/Register/Cell/MastodonRegisterTextFieldTableViewCell.swift

@@ -115,6 +115,7 @@ extension MastodonRegisterTextFieldTableViewCell {
             label.font = MastodonRegisterTextFieldTableViewCell.textFieldLabelFont
             label.textColor = Asset.Colors.Label.primary.color
             label.text = text
+            label.lineBreakMode = .byTruncatingMiddle
             
             label.translatesAutoresizingMaskIntoConstraints = false
             containerView.addSubview(label)
@@ -123,6 +124,7 @@ extension MastodonRegisterTextFieldTableViewCell {
                 label.leadingAnchor.constraint(equalTo: paddingView.trailingAnchor),
                 containerView.trailingAnchor.constraint(equalTo: label.trailingAnchor, constant: 16),
                 label.bottomAnchor.constraint(equalTo: containerView.bottomAnchor),
+                label.widthAnchor.constraint(lessThanOrEqualToConstant: 180).priority(.required - 1),
             ])
             return containerView
         }()

Mastodon/Scene/Onboarding/Register/MastodonRegisterView.swift

@@ -0,0 +1,301 @@
+//
+//  MastodonRegisterView.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-27.
+//
+
+import UIKit
+import SwiftUI
+import MastodonLocalization
+import MastodonSDK
+import MastodonAsset
+
+struct MastodonRegisterView: View {
+    
+    @ObservedObject var viewModel: MastodonRegisterViewModel
+    
+    @State var usernameRightViewWidth: CGFloat = 300
+    
+    var body: some View {
+        ScrollView(.vertical) {
+            let margin: CGFloat = 16
+            
+            // header
+            HStack {
+                Text(L10n.Scene.Register.title(viewModel.domain))
+                    .font(Font(MastodonPickServerViewController.largeTitleFont as CTFont))
+                    .foregroundColor(Color(Asset.Colors.Label.primary.color))
+                Spacer()
+            }
+            .padding(.horizontal, margin)
+            
+            // Avatar selector
+            Menu {
+                // Photo Library
+                Button {
+                    viewModel.avatarMediaMenuActionPublisher.send(.photoLibrary)
+                } label: {
+                    Label(L10n.Scene.Compose.MediaSelection.photoLibrary, systemImage: "photo")
+                }
+                // Camera
+                if UIImagePickerController.isSourceTypeAvailable(.camera) {
+                    Button {
+                        viewModel.avatarMediaMenuActionPublisher.send(.camera)
+                    } label: {
+                        Label(L10n.Scene.Compose.MediaSelection.camera, systemImage: "camera")
+                    }
+                }
+                // Browse
+                Button {
+                    viewModel.avatarMediaMenuActionPublisher.send(.browse)
+                } label: {
+                    Label(L10n.Scene.Compose.MediaSelection.browse, systemImage: "folder")
+                }
+                // Delete
+                if viewModel.avatarImage != nil {
+                    Divider()
+                    if #available(iOS 15.0, *) {
+                        Button(role: .destructive) {
+                            viewModel.avatarMediaMenuActionPublisher.send(.delete)
+                        } label: {
+                            Label(L10n.Scene.Register.Input.Avatar.delete, systemImage: "delete.left")
+                        }
+                    } else {
+                        // Fallback on earlier ve rsions
+                        Button {
+                            viewModel.avatarMediaMenuActionPublisher.send(.delete)
+                        } label: {
+                            Label(L10n.Scene.Register.Input.Avatar.delete, systemImage: "delete.left")
+                        }
+                    }
+                }
+            } label: {
+                let avatarImage = viewModel.avatarImage ?? Asset.Scene.Onboarding.avatarPlaceholder.image
+                Image(uiImage: avatarImage)
+                    .resizable()
+                    .frame(width: 88, height: 88, alignment: .center)
+                    .overlay(ZStack {
+                        Color.black.opacity(0.5)
+                            .frame(height: 22, alignment: .bottom)
+                        Text(L10n.Common.Controls.Actions.edit)
+                            .font(.system(size: 13, weight: .semibold))
+                            .foregroundColor(.white)
+                    }, alignment: .bottom)
+                    .cornerRadius(22)
+            }
+            .padding(EdgeInsets(top: 20, leading: 0, bottom: 20, trailing: 0))
+
+            // Display Name & Uesrname
+            VStack(alignment: .leading, spacing: 11) {
+                TextField(L10n.Scene.Register.Input.DisplayName.placeholder.localizedCapitalized, text: $viewModel.name)
+                    .textContentType(.name)
+                    .disableAutocorrection(true)
+                    .modifier(FormTextFieldModifier(validateState: viewModel.displayNameValidateState))
+                HStack {
+                    TextField(L10n.Scene.Register.Input.Username.placeholder.localizedCapitalized, text: $viewModel.username)
+                        .textContentType(.username)
+                        .autocapitalization(.none)
+                        .disableAutocorrection(true)
+                        .keyboardType(.asciiCapable)
+                    Text("@\(viewModel.domain)")
+                        .lineLimit(1)
+                        .truncationMode(.middle)
+                        .measureWidth { usernameRightViewWidth = $0 }
+                        .frame(width: min(300.0, usernameRightViewWidth), alignment: .trailing)
+                }
+                .modifier(FormTextFieldModifier(validateState: viewModel.usernameValidateState))
+                .environment(\.layoutDirection, .leftToRight)   // force LTR
+                if let errorPrompt = viewModel.usernameErrorPrompt {
+                    Text(errorPrompt)
+                        .modifier(FormFootnoteModifier())
+                }
+            }
+            .padding(.horizontal, margin)
+            .padding(.bottom, 22)
+            
+            // Email & Password & Password hint
+            VStack(alignment: .leading, spacing: 11) {
+                TextField(L10n.Scene.Register.Input.Email.placeholder.localizedCapitalized, text: $viewModel.email)
+                    .textContentType(.emailAddress)
+                    .autocapitalization(.none)
+                    .disableAutocorrection(true)
+                    .keyboardType(.emailAddress)
+                    .modifier(FormTextFieldModifier(validateState: viewModel.emailValidateState))
+                if let errorPrompt = viewModel.emailErrorPrompt {
+                    Text(errorPrompt)
+                        .modifier(FormFootnoteModifier())
+                }
+                SecureField(L10n.Scene.Register.Input.Password.placeholder.localizedCapitalized, text: $viewModel.password)
+                    .textContentType(.newPassword)
+                    .modifier(FormTextFieldModifier(validateState: viewModel.passwordValidateState))
+                Text(L10n.Scene.Register.Input.Password.hint)
+                    .modifier(FormFootnoteModifier(foregroundColor: .secondary))
+                if let errorPrompt = viewModel.passwordErrorPrompt {
+                    Text(errorPrompt)
+                        .modifier(FormFootnoteModifier())
+                }
+            }
+            .padding(.horizontal, margin)
+            .padding(.bottom, 22)
+            
+            // Reason
+            if viewModel.approvalRequired {
+                VStack(alignment: .leading, spacing: 11) {
+                    TextField(L10n.Scene.Register.Input.Invite.registrationUserInviteRequest.localizedCapitalized, text: $viewModel.reason)
+                        .modifier(FormTextFieldModifier(validateState: viewModel.reasonValidateState))
+                    if let errorPrompt = viewModel.reasonErrorPrompt {
+                        Text(errorPrompt)
+                            .modifier(FormFootnoteModifier())
+                    }
+                }
+                .padding(.horizontal, margin)
+            }
+            
+            Spacer()
+                .frame(minHeight: viewModel.bottomPaddingHeight)
+        }
+        .background(
+            Color(viewModel.backgroundColor)
+                .onTapGesture {
+                    viewModel.endEditing.send()
+                }
+        )
+    }
+    
+    struct FormTextFieldModifier: ViewModifier {
+        var validateState: MastodonRegisterViewModel.ValidateState
+
+        func body(content: Content) -> some View {
+            ZStack {
+                let shadowColor: Color = {
+                    switch validateState {
+                    case .empty:    return .black.opacity(0.125)
+                    case .invalid:  return Color(Asset.Colors.TextField.invalid.color)
+                    case .valid:    return Color(Asset.Colors.TextField.valid.color)
+                    }
+                }()
+                Color(Asset.Scene.Onboarding.textFieldBackground.color)
+                    .cornerRadius(10)
+                    .shadow(color: shadowColor, radius: 1, x: 0, y: 2)
+                    .animation(.easeInOut, value: validateState)
+                content
+                    .padding()
+                    .background(Color(Asset.Scene.Onboarding.textFieldBackground.color))
+                    .cornerRadius(10)
+            }
+        }
+    }
+    
+    struct FormFootnoteModifier: ViewModifier {
+        var foregroundColor = Color(Asset.Colors.TextField.invalid.color)
+        func body(content: Content) -> some View {
+            content
+                .font(.footnote)
+                .foregroundColor(foregroundColor)
+                .padding(.horizontal)
+        }
+    }
+    
+}
+
+struct WidthKey: PreferenceKey {
+    static let defaultValue: CGFloat = 0
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value = nextValue()
+    }
+}
+
+extension View {
+    func measureWidth(_ f: @escaping (CGFloat) -> ()) -> some View {
+        overlay(GeometryReader { proxy in
+            Color.clear.preference(key: WidthKey.self, value: proxy.size.width)
+        }
+        .onPreferenceChange(WidthKey.self, perform: f))
+    }
+}
+
+#if DEBUG
+struct MastodonRegisterView_Previews: PreviewProvider {
+    static var viewMdoel: MastodonRegisterViewModel {
+        let domain = "mstdn.jp"
+        return MastodonRegisterViewModel(
+            context: .shared,
+            domain: domain,
+            authenticateInfo: AuthenticationViewModel.AuthenticateInfo(
+                domain: domain,
+                application:  Mastodon.Entity.Application(
+                    name: "Preview",
+                    website: nil,
+                    vapidKey: nil,
+                    redirectURI: nil,
+                    clientID: "",
+                    clientSecret: ""
+                ),
+                redirectURI: ""
+            )!,
+            instance: Mastodon.Entity.Instance(domain: "mstdn.jp"),
+            applicationToken: Mastodon.Entity.Token(
+                accessToken: "",
+                tokenType: "",
+                scope: "",
+                createdAt: Date()
+            )
+        )
+    }
+    
+    static var viewMdoel2: MastodonRegisterViewModel {
+        let domain = "mstdn.jp"
+        return MastodonRegisterViewModel(
+            context: .shared,
+            domain: domain,
+            authenticateInfo: AuthenticationViewModel.AuthenticateInfo(
+                domain: domain,
+                application:  Mastodon.Entity.Application(
+                    name: "Preview",
+                    website: nil,
+                    vapidKey: nil,
+                    redirectURI: nil,
+                    clientID: "",
+                    clientSecret: ""
+                ),
+                redirectURI: ""
+            )!,
+            instance: Mastodon.Entity.Instance(domain: "mstdn.jp", approvalRequired: true),
+            applicationToken: Mastodon.Entity.Token(
+                accessToken: "",
+                tokenType: "",
+                scope: "",
+                createdAt: Date()
+            )
+        )
+    }
+            
+    static var previews: some View {
+        Group {
+            NavigationView {
+                MastodonRegisterView(viewModel: viewMdoel)
+                    .navigationBarTitle(Text(""))
+                    .navigationBarTitleDisplayMode(.inline)
+            }
+            NavigationView {
+                MastodonRegisterView(viewModel: viewMdoel)
+                    .navigationBarTitle(Text(""))
+                    .navigationBarTitleDisplayMode(.inline)
+            }
+            .preferredColorScheme(.dark)
+            NavigationView {
+                MastodonRegisterView(viewModel: viewMdoel)
+                    .navigationBarTitle(Text(""))
+                    .navigationBarTitleDisplayMode(.inline)
+            }
+            .environment(\.sizeCategory, .accessibilityExtraLarge)
+            NavigationView {
+                MastodonRegisterView(viewModel: viewMdoel2)
+                    .navigationBarTitle(Text(""))
+                    .navigationBarTitleDisplayMode(.inline)
+            }
+        }
+    }
+}
+#endif

Mastodon/Scene/Onboarding/Register/MastodonRegisterViewController.swift

@@ -11,6 +11,8 @@ import MastodonSDK
 import os.log
 import PhotosUI
 import UIKit
+import SwiftUI
+import MastodonUI
 import MastodonAsset
 import MastodonLocalization
 
@@ -27,6 +29,7 @@ final class MastodonRegisterViewController: UIViewController, NeedsDependency, O
     weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
     
     var viewModel: MastodonRegisterViewModel!
+    private(set) lazy var mastodonRegisterView = MastodonRegisterView(viewModel: viewModel)
 
     // picker
     private(set) lazy var imagePicker: PHPickerViewController = {
@@ -51,22 +54,6 @@ final class MastodonRegisterViewController: UIViewController, NeedsDependency, O
         return documentPickerController
     }()
     
-    let tapGestureRecognizer = UITapGestureRecognizer.singleTapGestureRecognizer
-    
-    let tableView: UITableView = {
-        let tableView = UITableView()
-        tableView.rowHeight = UITableView.automaticDimension
-        tableView.separatorStyle = .none
-        tableView.backgroundColor = .clear
-        tableView.keyboardDismissMode = .onDrag
-        if #available(iOS 15.0, *) {
-            tableView.sectionHeaderTopPadding = .leastNonzeroMagnitude
-        } else {
-            // Fallback on earlier versions
-        }
-        return tableView
-    }()
-    
     let navigationActionView: NavigationActionView = {
         let navigationActionView = NavigationActionView()
         navigationActionView.backgroundColor = Asset.Scene.Onboarding.background.color
@@ -87,17 +74,21 @@ extension MastodonRegisterViewController {
         navigationItem.leftBarButtonItem = UIBarButtonItem()
         
         setupOnboardingAppearance()
+        viewModel.backgroundColor = view.backgroundColor ?? .clear
         defer {
             setupNavigationBarBackgroundView()
         }
         
-        tableView.translatesAutoresizingMaskIntoConstraints = false
+        let hostingViewController = UIHostingController(rootView: mastodonRegisterView)
-        view.addSubview(tableView)
+        hostingViewController.view.preservesSuperviewLayoutMargins = true
+        addChild(hostingViewController)
+        hostingViewController.view.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(hostingViewController.view)
         NSLayoutConstraint.activate([
-            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            hostingViewController.view.topAnchor.constraint(equalTo: view.topAnchor),
-            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            hostingViewController.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
-            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            hostingViewController.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
-            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            hostingViewController.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
         ])
         
         navigationActionView.translatesAutoresizingMaskIntoConstraints = false
@@ -115,7 +106,7 @@ extension MastodonRegisterViewController {
             .observe(\.bounds, options: [.initial, .new]) { [weak self] navigationActionView, _ in
                 guard let self = self else { return }
                 let inset = navigationActionView.frame.height
-                self.tableView.contentInset.bottom = inset
+                self.viewModel.bottomPaddingHeight = inset
             }
             .store(in: &observations)
         
@@ -129,19 +120,14 @@ extension MastodonRegisterViewController {
                 self.navigationActionView.nextButton.isEnabled = isAllValid
             }
             .store(in: &disposeBag)
-        
-        viewModel.setupDiffableDataSource(tableView: tableView)
-        
-//        KeyboardResponderService
-//            .configure(
-//                scrollView: tableView,
-//                layoutNeedsUpdate: viewModel.viewDidAppear.eraseToAnyPublisher()
-//            )
-//            .store(in: &disposeBag)
 
-        // gesture
+        viewModel.endEditing
-        view.addGestureRecognizer(tapGestureRecognizer)
+            .receive(on: DispatchQueue.main)
-        tapGestureRecognizer.addTarget(self, action: #selector(tapGestureRecognizerHandler))
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.view.endEditing(true)
+            }
+            .store(in: &disposeBag)
 
 //        // return
 //        if viewModel.approvalRequired {
@@ -149,80 +135,22 @@ extension MastodonRegisterViewController {
 //        } else {
 //            passwordTextField.returnKeyType = .done
 //        }
-//
+        
-//        viewModel.usernameValidateState
+        viewModel.$error
-//            .receive(on: DispatchQueue.main)
+            .receive(on: DispatchQueue.main)
-//            .sink { [weak self] validateState in
+            .sink { [weak self] error in
-//                guard let self = self else { return }
+                guard let self = self else { return }
-//                self.setTextFieldValidAppearance(self.usernameTextField, validateState: validateState)
+                guard let error = error as? Mastodon.API.Error else { return }
-//            }
+                let alertController = UIAlertController(for: error, title: "Sign Up Failure", preferredStyle: .alert)
-//            .store(in: &disposeBag)
+                let okAction = UIAlertAction(title: L10n.Common.Controls.Actions.ok, style: .default, handler: nil)
-//        viewModel.usernameErrorPrompt
+                alertController.addAction(okAction)
-//            .receive(on: DispatchQueue.main)
+                self.coordinator.present(
-//            .sink { [weak self] prompt in
+                    scene: .alertController(alertController: alertController),
-//                guard let self = self else { return }
+                    from: nil,
-//                self.usernameErrorPromptLabel.attributedText = prompt
+                    transition: .alertController(animated: true, completion: nil)
-//            }
+                )
-//            .store(in: &disposeBag)
+            }
-//        viewModel.displayNameValidateState
+            .store(in: &disposeBag)
-//            .receive(on: DispatchQueue.main)
-//            .sink { [weak self] validateState in
-//                guard let self = self else { return }
-//                self.setTextFieldValidAppearance(self.displayNameTextField, validateState: validateState)
-//            }
-//            .store(in: &disposeBag)
-//        viewModel.emailValidateState
-//            .receive(on: DispatchQueue.main)
-//            .sink { [weak self] validateState in
-//                guard let self = self else { return }
-//                self.setTextFieldValidAppearance(self.emailTextField, validateState: validateState)
-//            }
-//            .store(in: &disposeBag)
-//        viewModel.emailErrorPrompt
-//            .receive(on: DispatchQueue.main)
-//            .sink { [weak self] prompt in
-//                guard let self = self else { return }
-//                self.emailErrorPromptLabel.attributedText = prompt
-//            }
-//            .store(in: &disposeBag)
-//        viewModel.passwordValidateState
-//            .receive(on: DispatchQueue.main)
-//            .sink { [weak self] validateState in
-//                guard let self = self else { return }
-//                self.setTextFieldValidAppearance(self.passwordTextField, validateState: validateState)
-//                self.passwordCheckLabel.attributedText = MastodonRegisterViewModel.attributeStringForPassword(validateState: validateState)
-//            }
-//            .store(in: &disposeBag)
-//        viewModel.passwordErrorPrompt
-//            .receive(on: DispatchQueue.main)
-//            .sink { [weak self] prompt in
-//                guard let self = self else { return }
-//                self.passwordErrorPromptLabel.attributedText = prompt
-//            }
-//            .store(in: &disposeBag)
-//        viewModel.reasonErrorPrompt
-//            .receive(on: DispatchQueue.main)
-//            .sink { [weak self] prompt in
-//                guard let self = self else { return }
-//                self.reasonErrorPromptLabel.attributedText = prompt
-//            }
-//            .store(in: &disposeBag)
-//        viewModel.error
-//            .receive(on: DispatchQueue.main)
-//            .sink { [weak self] error in
-//                guard let self = self else { return }
-//                guard let error = error as? Mastodon.API.Error else { return }
-//                let alertController = UIAlertController(for: error, title: "Sign Up Failure", preferredStyle: .alert)
-//                let okAction = UIAlertAction(title: L10n.Common.Controls.Actions.ok, style: .default, handler: nil)
-//                alertController.addAction(okAction)
-//                self.coordinator.present(
-//                    scene: .alertController(alertController: alertController),
-//                    from: nil,
-//                    transition: .alertController(animated: true, completion: nil)
-//                )
-//            }
-//            .store(in: &disposeBag)
-//
 
         viewModel.avatarMediaMenuActionPublisher
             .receive(on: DispatchQueue.main)
@@ -260,10 +188,6 @@ extension MastodonRegisterViewController {
 
 extension MastodonRegisterViewController {
     
-    @objc private func tapGestureRecognizerHandler(_ sender: UITapGestureRecognizer) {
-        view.endEditing(true)
-    }
-    
     @objc private func backButtonPressed(_ sender: UIButton) {
         logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
         navigationController?.popViewController(animated: true)
@@ -403,65 +327,3 @@ extension MastodonRegisterViewController {
     }
     
 }
-
-extension MastodonRegisterViewController: UITextFieldDelegate {
-//    func textFieldDidBeginEditing(_ textField: UITextField) {
-//        let text = textField.text?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
-//
-//        switch textField {
-//        case usernameTextField:
-//            viewModel.username.value = text
-//        case displayNameTextField:
-//            viewModel.displayName.value = text
-//        case emailTextField:
-//            viewModel.email.value = text
-//        case passwordTextField:
-//            viewModel.password.value = text
-//        case reasonTextField:
-//            viewModel.reason.value = text
-//        default:
-//            break
-//        }
-//    }
-//
-//    func textFieldDidEndEditing(_ textField: UITextField) {
-//        let text = textField.text?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
-//
-//        switch textField {
-//        case usernameTextField:
-//            viewModel.username.value = text
-//        case displayNameTextField:
-//            viewModel.displayName.value = text
-//        case emailTextField:
-//            viewModel.email.value = text
-//        case passwordTextField:
-//            viewModel.password.value = text
-//        case reasonTextField:
-//            viewModel.reason.value = text
-//        default:
-//            break
-//        }
-//    }
-//
-//    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
-//        switch textField {
-//        case usernameTextField:
-//            displayNameTextField.becomeFirstResponder()
-//        case displayNameTextField:
-//            emailTextField.becomeFirstResponder()
-//        case emailTextField:
-//            passwordTextField.becomeFirstResponder()
-//        case passwordTextField:
-//            if viewModel.approvalRequired {
-//                reasonTextField.becomeFirstResponder()
-//            } else {
-//                passwordTextField.resignFirstResponder()
-//            }
-//        case reasonTextField:
-//            reasonTextField.resignFirstResponder()
-//        default:
-//            break
-//        }
-//        return true
-//    }
-}

Mastodon/Scene/Onboarding/Register/MastodonRegisterViewModel+Diffable.swift

@@ -143,7 +143,7 @@ extension MastodonRegisterViewModel {
         snapshot.appendItems([.header(domain: domain)], toSection: .main)
         snapshot.appendItems([.avatar, .name, .username, .email, .password, .hint], toSection: .main)
         if approvalRequired {
-            snapshot.appendItems([.reason], toSection: .main)            
+            snapshot.appendItems([.reason], toSection: .main)
         }
         diffableDataSource?.applySnapshot(snapshot, animated: false, completion: nil)
     }
@@ -164,51 +164,6 @@ extension MastodonRegisterViewModel {
             .store(in: &cell.disposeBag)
     }
     
-    enum AvatarMediaMenuAction {
-        case photoLibrary
-        case camera
-        case browse
-        case delete
-    }
-    
-    private func createAvatarMediaContextMenu() -> UIMenu {
-        var children: [UIMenuElement] = []
-        
-        // Photo Library
-        let photoLibraryAction = UIAction(title: L10n.Scene.Compose.MediaSelection.photoLibrary, image: UIImage(systemName: "rectangle.on.rectangle"), identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off) { [weak self] _ in
-            guard let self = self else { return }
-            self.avatarMediaMenuActionPublisher.send(.photoLibrary)
-        }
-        children.append(photoLibraryAction)
-        
-        // Camera
-        if UIImagePickerController.isSourceTypeAvailable(.camera) {
-            let cameraAction = UIAction(title: L10n.Scene.Compose.MediaSelection.camera, image: UIImage(systemName: "camera"), identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off, handler: { [weak self] _ in
-                guard let self = self else { return }
-                self.avatarMediaMenuActionPublisher.send(.camera)
-            })
-            children.append(cameraAction)
-        }
-        
-        // Browse
-        let browseAction = UIAction(title: L10n.Scene.Compose.MediaSelection.browse, image: UIImage(systemName: "ellipsis"), identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off) { [weak self] _ in
-            guard let self = self else { return }
-            self.avatarMediaMenuActionPublisher.send(.browse)
-        }
-        children.append(browseAction)
-        
-        // Delete
-        if avatarImage != nil {
-            let deleteAction = UIAction(title: L10n.Scene.Register.Input.Avatar.delete, image: UIImage(systemName: "delete.left"), identifier: nil, discoverabilityTitle: nil, attributes: [.destructive], state: .off) { [weak self] _ in
-                guard let self = self else { return }
-                self.avatarMediaMenuActionPublisher.send(.delete)
-            }
-            children.append(deleteAction)
-        }
-
-        return UIMenu(title: "", image: nil, identifier: nil, options: .displayInline, children: children)
-    }
-    
     private func configureTextFieldCell(
         cell: MastodonRegisterTextFieldTableViewCell,
         validateState: Published<ValidateState>.Publisher

Mastodon/Scene/Onboarding/Register/MastodonRegisterViewModel.swift

@@ -12,7 +12,7 @@ import UIKit
 import MastodonAsset
 import MastodonLocalization
 
-final class MastodonRegisterViewModel {
+final class MastodonRegisterViewModel: ObservableObject {
     var disposeBag = Set<AnyCancellable>()
     
     // input
@@ -23,6 +23,7 @@ final class MastodonRegisterViewModel {
     let applicationToken: Mastodon.Entity.Token
     let viewDidAppear = CurrentValueSubject<Void, Never>(Void())
 
+    @Published var backgroundColor: UIColor = Asset.Scene.Onboarding.background.color
     @Published var avatarImage: UIImage? = nil
     @Published var name = ""
     @Published var username = ""
@@ -30,10 +31,12 @@ final class MastodonRegisterViewModel {
     @Published var password = ""
     @Published var reason = ""
     
-    let usernameErrorPrompt = CurrentValueSubject<NSAttributedString?, Never>(nil)
+    @Published var usernameErrorPrompt: String? = nil
-    let emailErrorPrompt = CurrentValueSubject<NSAttributedString?, Never>(nil)
+    @Published var emailErrorPrompt: String? = nil
-    let passwordErrorPrompt = CurrentValueSubject<NSAttributedString?, Never>(nil)
+    @Published var passwordErrorPrompt: String? = nil
-    let reasonErrorPrompt = CurrentValueSubject<NSAttributedString?, Never>(nil)
+    @Published var reasonErrorPrompt: String? = nil
+    
+    @Published var bottomPaddingHeight: CGFloat = .zero
     
     // output
     var diffableDataSource: UITableViewDiffableDataSource<RegisterSection, RegisterItem>?
@@ -51,6 +54,7 @@ final class MastodonRegisterViewModel {
     @Published var error: Error? = nil
     
     let avatarMediaMenuActionPublisher = PassthroughSubject<AvatarMediaMenuAction, Never>()
+    let endEditing = PassthroughSubject<Void, Never>()
 
     init(
         context: AppContext,
@@ -97,45 +101,46 @@ final class MastodonRegisterViewModel {
             .assign(to: \.usernameValidateState, on: self)
             .store(in: &disposeBag)
         
-        // TODO: check username available
+        // check username available
-//        username
+        $username
-//            .filter { !$0.isEmpty }
+            .filter { !$0.isEmpty }
-//            .debounce(for: .milliseconds(300), scheduler: DispatchQueue.main)
+            .debounce(for: .milliseconds(300), scheduler: DispatchQueue.main)
-//            .removeDuplicates()
+            .removeDuplicates()
-//            .compactMap { [weak self] text -> AnyPublisher<Result<Mastodon.Response.Content<Mastodon.Entity.Account>, Error>, Never>? in
+            .compactMap { [weak self] text -> AnyPublisher<Result<Mastodon.Response.Content<Mastodon.Entity.Account>, Error>, Never>? in
-//                guard let self = self else { return nil }
+                guard let self = self else { return nil }
-//                let query = Mastodon.API.Account.AccountLookupQuery(acct: text)
+                let query = Mastodon.API.Account.AccountLookupQuery(acct: text)
-//                return context.apiService.accountLookup(domain: domain, query: query, authorization: self.applicationAuthorization)
+                return context.apiService.accountLookup(domain: domain, query: query, authorization: self.applicationAuthorization)
-//                    .map {
+                    .map {
-//                        response -> Result<Mastodon.Response.Content<Mastodon.Entity.Account>, Error> in
+                        response -> Result<Mastodon.Response.Content<Mastodon.Entity.Account>, Error> in
-//                        Result.success(response)
+                        Result.success(response)
-//                    }
+                    }
-//                    .catch { error in
+                    .catch { error in
-//                        Just(Result.failure(error))
+                        Just(Result.failure(error))
-//                    }
+                    }
-//                    .eraseToAnyPublisher()
+                    .eraseToAnyPublisher()
-//            }
+            }
-//            .switchToLatest()
+            .switchToLatest()
-//            .sink { [weak self] result in
+            .receive(on: DispatchQueue.main)
-//                guard let self = self else { return }
+            .sink { [weak self] result in
-//                switch result {
+                guard let self = self else { return }
-//                case .success:
+                switch result {
-//                    let text = L10n.Scene.Register.Error.Reason.taken(L10n.Scene.Register.Error.Item.username)
+                case .success:
-//                    self.usernameErrorPrompt.value = MastodonRegisterViewModel.errorPromptAttributedString(for: text)
+                    let text = L10n.Scene.Register.Error.Reason.taken(L10n.Scene.Register.Error.Item.username)
-//                    self.usernameValidateState.value = .invalid
+                    self.usernameErrorPrompt = text
-//                case .failure:
+                    self.usernameValidateState = .invalid
-//                    break
+                case .failure:
-//                }
+                    break
-//            }
+                }
-//            .store(in: &disposeBag)
+            }
-//        
+            .store(in: &disposeBag)
-//        usernameValidateState
+       
-//            .sink { [weak self] validateState in
+        $usernameValidateState
-//                if validateState == .valid {
+            .sink { [weak self] validateState in
-//                    self?.usernameErrorPrompt.value = nil
+                if validateState == .valid {
-//                }
+                    self?.usernameErrorPrompt = nil
-//            }
+                }
-//            .store(in: &disposeBag)
+            }
+            .store(in: &disposeBag)
 
         $email
             .map { email in
@@ -163,27 +168,31 @@ final class MastodonRegisterViewModel {
                 .store(in: &disposeBag)
         }
         
-//        error
+        $error
-//            .sink { [weak self] error in
+            .sink { [weak self] error in
-//                guard let self = self else { return }
+                guard let self = self else { return }
-//                let error = error as? Mastodon.API.Error
+                let error = error as? Mastodon.API.Error
-//                let mastodonError = error?.mastodonError
+                let mastodonError = error?.mastodonError
-//                if case let .generic(genericMastodonError) = mastodonError,
+                if case let .generic(genericMastodonError) = mastodonError,
-//                   let details = genericMastodonError.details
+                   let details = genericMastodonError.details
-//                {
+                {
-//                    self.usernameErrorPrompt.value = details.usernameErrorDescriptions.first.flatMap { MastodonRegisterViewModel.errorPromptAttributedString(for: $0) }
+                    self.usernameErrorPrompt = details.usernameErrorDescriptions.first
-//                    self.emailErrorPrompt.value = details.emailErrorDescriptions.first.flatMap { MastodonRegisterViewModel.errorPromptAttributedString(for: $0) }
+                    details.usernameErrorDescriptions.first.flatMap { _ in self.usernameValidateState = .invalid }
-//                    self.passwordErrorPrompt.value = details.passwordErrorDescriptions.first.flatMap { MastodonRegisterViewModel.errorPromptAttributedString(for: $0) }
+                    self.emailErrorPrompt = details.emailErrorDescriptions.first
-//                    self.reasonErrorPrompt.value = details.reasonErrorDescriptions.first.flatMap { MastodonRegisterViewModel.errorPromptAttributedString(for: $0) }
+                    details.emailErrorDescriptions.first.flatMap { _ in self.emailValidateState = .invalid }
-//                } else {
+                    self.passwordErrorPrompt = details.passwordErrorDescriptions.first
-//                    self.usernameErrorPrompt.value = nil
+                    details.passwordErrorDescriptions.first.flatMap { _ in self.passwordValidateState = .invalid }
-//                    self.emailErrorPrompt.value = nil
+                    self.reasonErrorPrompt = details.reasonErrorDescriptions.first
-//                    self.passwordErrorPrompt.value = nil
+                    details.reasonErrorDescriptions.first.flatMap { _ in self.reasonValidateState = .invalid }
-//                    self.reasonErrorPrompt.value = nil
+                } else {
-//                }
+                    self.usernameErrorPrompt = nil
-//            }
+                    self.emailErrorPrompt = nil
-//            .store(in: &disposeBag)
+                    self.passwordErrorPrompt = nil
-//        
+                    self.reasonErrorPrompt = nil
+                }
+            }
+            .store(in: &disposeBag)
+        
         let publisherOne = Publishers.CombineLatest4(
             $usernameValidateState,
             $displayNameValidateState,
@@ -213,7 +222,7 @@ final class MastodonRegisterViewModel {
 }
 
 extension MastodonRegisterViewModel {
-    enum ValidateState {
+    enum ValidateState: Hashable {
         case empty
         case invalid
         case valid
@@ -271,3 +280,52 @@ extension MastodonRegisterViewModel {
         return attributeString
     }
 }
+
+extension MastodonRegisterViewModel {
+    
+    enum AvatarMediaMenuAction {
+        case photoLibrary
+        case camera
+        case browse
+        case delete
+    }
+    
+    private func createAvatarMediaContextMenu() -> UIMenu {
+        var children: [UIMenuElement] = []
+        
+        // Photo Library
+        let photoLibraryAction = UIAction(title: L10n.Scene.Compose.MediaSelection.photoLibrary, image: UIImage(systemName: "rectangle.on.rectangle"), identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off) { [weak self] _ in
+            guard let self = self else { return }
+            self.avatarMediaMenuActionPublisher.send(.photoLibrary)
+        }
+        children.append(photoLibraryAction)
+        
+        // Camera
+        if UIImagePickerController.isSourceTypeAvailable(.camera) {
+            let cameraAction = UIAction(title: L10n.Scene.Compose.MediaSelection.camera, image: UIImage(systemName: "camera"), identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off, handler: { [weak self] _ in
+                guard let self = self else { return }
+                self.avatarMediaMenuActionPublisher.send(.camera)
+            })
+            children.append(cameraAction)
+        }
+        
+        // Browse
+        let browseAction = UIAction(title: L10n.Scene.Compose.MediaSelection.browse, image: UIImage(systemName: "ellipsis"), identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off) { [weak self] _ in
+            guard let self = self else { return }
+            self.avatarMediaMenuActionPublisher.send(.browse)
+        }
+        children.append(browseAction)
+        
+        // Delete
+        if avatarImage != nil {
+            let deleteAction = UIAction(title: L10n.Scene.Register.Input.Avatar.delete, image: UIImage(systemName: "delete.left"), identifier: nil, discoverabilityTitle: nil, attributes: [.destructive], state: .off) { [weak self] _ in
+                guard let self = self else { return }
+                self.avatarMediaMenuActionPublisher.send(.delete)
+            }
+            children.append(deleteAction)
+        }
+
+        return UIMenu(title: "", image: nil, identifier: nil, options: .displayInline, children: children)
+    }
+    
+}

Mastodon/Scene/Onboarding/ServerRules/MastodonServerRulesViewController+Debug.swift

@@ -0,0 +1,50 @@
+//
+//  MastodonServerRulesViewController+Debug.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-4-27.
+//
+
+import UIKit
+
+#if DEBUG
+
+extension MastodonRegisterViewController {
+    
+    @MainActor
+    static func create(
+        context: AppContext,
+        coordinator: SceneCoordinator,
+        domain: String
+    ) async throws -> MastodonRegisterViewController {
+        let viewController = MastodonRegisterViewController()
+        viewController.context = context
+        viewController.coordinator = coordinator
+        
+        let instanceResponse = try await context.apiService.instance(domain: domain).singleOutput()
+        let applicationResponse = try await context.apiService.createApplication(domain: domain).singleOutput()
+        let accessTokenResponse = try await context.apiService.applicationAccessToken(
+            domain: domain,
+            clientID: applicationResponse.value.clientID!,
+            clientSecret: applicationResponse.value.clientSecret!,
+            redirectURI: applicationResponse.value.redirectURI!
+        ).singleOutput()
+        
+        viewController.viewModel = MastodonRegisterViewModel(
+            context: context,
+            domain: domain,
+            authenticateInfo: .init(
+                domain: domain,
+                application: applicationResponse.value
+            )!,
+            instance: instanceResponse.value,
+            applicationToken: accessTokenResponse.value
+        )
+        
+        return viewController
+    }
+    
+}
+
+#endif
+

Mastodon/Scene/Profile/Header/ProfileHeaderViewModel.swift

@@ -90,7 +90,10 @@ extension ProfileHeaderViewModel {
 extension ProfileHeaderViewModel {
     
     static func normalize(note: String?) -> String? {
-        guard let note = note?.trimmingCharacters(in: .whitespacesAndNewlines),!note.isEmpty else {
+        let _note = note?.replacingOccurrences(of: "<br>|<br />", with: "\u{2028}", options: .regularExpression, range: nil)
+            .replacingOccurrences(of: "</p>", with: "</p>\u{2029}", range: nil)
+            .trimmingCharacters(in: .whitespacesAndNewlines)
+        guard let note = _note, !note.isEmpty else {
             return nil
         }
         

Mastodon/Scene/Profile/ProfileViewController.swift

@@ -13,8 +13,9 @@ import MetaTextKit
 import MastodonAsset
 import MastodonLocalization
 import MastodonUI
-import Tabman
 import CoreDataStack
+import Tabman
+import Pageboy
 
 protocol ProfileViewModelEditable {
     func isEdited() -> Bool
@@ -42,19 +43,34 @@ final class ProfileViewController: UIViewController, NeedsDependency, MediaPrevi
     }()
     
     private(set) lazy var settingBarButtonItem: UIBarButtonItem = {
-        let barButtonItem = UIBarButtonItem(image: UIImage(systemName: "gear"), style: .plain, target: self, action: #selector(ProfileViewController.settingBarButtonItemPressed(_:)))
+        let barButtonItem = UIBarButtonItem(
+            image: Asset.ObjectsAndTools.gear.image.withRenderingMode(.alwaysTemplate),
+            style: .plain,
+            target: self,
+            action: #selector(ProfileViewController.settingBarButtonItemPressed(_:))
+        )
         barButtonItem.tintColor = .white
         return barButtonItem
     }()
     
     private(set) lazy var shareBarButtonItem: UIBarButtonItem = {
-        let barButtonItem = UIBarButtonItem(image: UIImage(systemName: "square.and.arrow.up"), style: .plain, target: self, action: #selector(ProfileViewController.shareBarButtonItemPressed(_:)))
+        let barButtonItem = UIBarButtonItem(
+            image: Asset.Arrow.squareAndArrowUp.image.withRenderingMode(.alwaysTemplate),
+            style: .plain,
+            target: self,
+            action: #selector(ProfileViewController.shareBarButtonItemPressed(_:))
+        )
         barButtonItem.tintColor = .white
         return barButtonItem
     }()
     
     private(set) lazy var favoriteBarButtonItem: UIBarButtonItem = {
-        let barButtonItem = UIBarButtonItem(image: UIImage(systemName: "star"), style: .plain, target: self, action: #selector(ProfileViewController.favoriteBarButtonItemPressed(_:)))
+        let barButtonItem = UIBarButtonItem(
+            image: Asset.ObjectsAndTools.star.image.withRenderingMode(.alwaysTemplate),
+            style: .plain,
+            target: self,
+            action: #selector(ProfileViewController.favoriteBarButtonItemPressed(_:))
+        )
         barButtonItem.tintColor = .white
         return barButtonItem
     }()
@@ -402,6 +418,7 @@ extension ProfileViewController {
 }
 
 extension ProfileViewController {
+    
     private func updateBarButtonInsets() {
         let margin: CGFloat = {
             switch traitCollection.userInterfaceIdiom {
@@ -618,7 +635,7 @@ extension ProfileViewController {
                 return nil
             }
             let name = user.displayNameWithFallback
-            let record = ManagedObjectRecord<MastodonUser>(objectID: user.objectID)
+            let _ = ManagedObjectRecord<MastodonUser>(objectID: user.objectID)
             let menu = MastodonMenu.setupMenu(
                 actions: [
                     .muteUser(.init(name: name, isMuting: self.viewModel.isMuting.value)),
@@ -633,7 +650,7 @@ extension ProfileViewController {
         .sink { [weak self] completion in
             guard let self = self else { return }
             switch completion {
-            case .failure(let error):
+            case .failure:
                 self.moreMenuBarButtonItem.menu = nil
             case .finished:
                 break
@@ -937,6 +954,7 @@ extension ProfileViewController: ProfileHeaderViewDelegate {
                 viewModel.isUpdating.value = true
                 Task {
                     do {
+                        // TODO: handle error
                         _ = try await viewModel.updateProfileInfo(
                             headerProfileInfo: profileHeaderViewModel.editProfileInfo,
                             aboutProfileInfo: profileAboutViewModel.editProfileInfo
@@ -1138,25 +1156,28 @@ extension ProfileViewController: ScrollViewContainer {
     }
 }
 
-//extension ProfileViewController {
+extension ProfileViewController {
-//
+
-//    override var keyCommands: [UIKeyCommand]? {
+    override var keyCommands: [UIKeyCommand]? {
-//        if !viewModel.isEditing.value {
+        if !viewModel.isEditing.value {
-//            return segmentedControlNavigateKeyCommands
+            return pageboyNavigateKeyCommands
-//        }
+        }
-//
+
-//        return nil
+        return nil
-//    }
+    }
-//
+
-//}
+}
+
+// MARK: - PageboyNavigateable
+extension ProfileViewController: PageboyNavigateable {
+    
+    var navigateablePageViewController: PageboyViewController {
+        return profileSegmentedViewController.pagingViewController
+    }
+    
+    @objc func pageboyNavigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
+        pageboyNavigateKeyCommandHandler(sender)
+    }
+    
+}
 
-// MARK: - SegmentedControlNavigateable
-//extension ProfileViewController: SegmentedControlNavigateable {
-//    var navigateableSegmentedControl: UISegmentedControl {
-//        profileHeaderViewController.pageSegmentedControl
-//    }
-//
-//    @objc func segmentedControlNavigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
-//        segmentedControlNavigateKeyCommandHandler(sender)
-//    }
-//}

Mastodon/Scene/Profile/ProfileViewModel.swift

@@ -13,10 +13,11 @@ import MastodonSDK
 import MastodonMeta
 import MastodonAsset
 import MastodonLocalization
+import MastodonUI
 
 // please override this base class
 class ProfileViewModel: NSObject {
-    
+        
     let logger = Logger(subsystem: "ProfileViewModel", category: "ViewModel")
     
     typealias UserID = String
@@ -372,101 +373,6 @@ extension ProfileViewModel {
 
 }
 
-extension ProfileViewModel {
-    
-    enum RelationshipAction: Int, CaseIterable {
-        case none       // set hide from UI
-        case follow
-        case request
-        case pending
-        case following
-        case muting
-        case blocked
-        case blocking
-        case suspended
-        case edit
-        case editing
-        case updating
-        
-        var option: RelationshipActionOptionSet {
-            return RelationshipActionOptionSet(rawValue: 1 << rawValue)
-        }
-    }
-    
-    // construct option set on the enum for safe iterator
-    struct RelationshipActionOptionSet: OptionSet {
-        let rawValue: Int
-        
-        static let none = RelationshipAction.none.option
-        static let follow = RelationshipAction.follow.option
-        static let request = RelationshipAction.request.option
-        static let pending = RelationshipAction.pending.option
-        static let following = RelationshipAction.following.option
-        static let muting = RelationshipAction.muting.option
-        static let blocked = RelationshipAction.blocked.option
-        static let blocking = RelationshipAction.blocking.option
-        static let suspended = RelationshipAction.suspended.option
-        static let edit = RelationshipAction.edit.option
-        static let editing = RelationshipAction.editing.option
-        static let updating = RelationshipAction.updating.option
-        
-        static let editOptions: RelationshipActionOptionSet = [.edit, .editing, .updating]
-        
-        func highPriorityAction(except: RelationshipActionOptionSet) -> RelationshipAction? {
-            let set = subtracting(except)
-            for action in RelationshipAction.allCases.reversed() where set.contains(action.option) {
-                return action
-            }
-            
-            return nil
-        }
-
-        var title: String {
-            guard let highPriorityAction = self.highPriorityAction(except: []) else {
-                assertionFailure()
-                return " "
-            }
-            switch highPriorityAction {
-            case .none: return " "
-            case .follow: return L10n.Common.Controls.Friendship.follow
-            case .request: return L10n.Common.Controls.Friendship.request
-            case .pending: return L10n.Common.Controls.Friendship.pending
-            case .following: return L10n.Common.Controls.Friendship.following
-            case .muting: return L10n.Common.Controls.Friendship.muted
-            case .blocked: return L10n.Common.Controls.Friendship.follow   // blocked by user
-            case .blocking: return L10n.Common.Controls.Friendship.blocked
-            case .suspended: return L10n.Common.Controls.Friendship.follow
-            case .edit: return L10n.Common.Controls.Friendship.editInfo
-            case .editing: return L10n.Common.Controls.Actions.done
-            case .updating: return " "
-            }
-        }
-        
-        @available(*, deprecated, message: "")
-        var backgroundColor: UIColor {
-            guard let highPriorityAction = self.highPriorityAction(except: []) else {
-                assertionFailure()
-                return Asset.Colors.brandBlue.color
-            }
-            switch highPriorityAction {
-            case .none: return Asset.Colors.brandBlue.color
-            case .follow: return Asset.Colors.brandBlue.color
-            case .request: return Asset.Colors.brandBlue.color
-            case .pending: return Asset.Colors.brandBlue.color
-            case .following: return Asset.Colors.brandBlue.color
-            case .muting: return Asset.Colors.alertYellow.color
-            case .blocked: return Asset.Colors.brandBlue.color
-            case .blocking: return Asset.Colors.danger.color
-            case .suspended: return Asset.Colors.brandBlue.color
-            case .edit: return Asset.Colors.brandBlue.color
-            case .editing: return Asset.Colors.brandBlue.color
-            case .updating: return Asset.Colors.brandBlue.color
-            }
-        }
-
-    }
-}
-
 extension ProfileViewModel {
     func updateProfileInfo(
         headerProfileInfo: ProfileHeaderViewModel.ProfileInfo,

Mastodon/Scene/Profile/Segmented/Paging/ProfilePagingViewModel.swift

@@ -44,7 +44,7 @@ final class ProfilePagingViewModel: NSObject {
     let barItems: [TMBarItemable] = {
         let items = [
             TMBarItem(title: L10n.Scene.Profile.SegmentedControl.posts),
-            TMBarItem(title: L10n.Scene.Profile.SegmentedControl.postsAndReplies),      // TODO: i18n
+            TMBarItem(title: L10n.Scene.Profile.SegmentedControl.postsAndReplies),
             TMBarItem(title: L10n.Scene.Profile.SegmentedControl.media),
             TMBarItem(title: L10n.Scene.Profile.SegmentedControl.about),
         ]

Mastodon/Scene/Profile/Timeline/UserTimelineViewController.swift

@@ -36,7 +36,7 @@ final class UserTimelineViewController: UIViewController, NeedsDependency, Media
     let cellFrameCache = NSCache<NSNumber, NSValue>()
 
     deinit {
-        os_log("%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
     }
     
 }

Mastodon/Scene/Profile/Timeline/UserTimelineViewModel+State.swift

@@ -195,6 +195,12 @@ extension UserTimelineViewModel.State {
             
             // trigger data source update. otherwise, spinner always display
             viewModel.isSuspended.value = viewModel.isSuspended.value
+
+            // remove bottom loader
+            guard let diffableDataSource = viewModel.diffableDataSource else { return }
+            var snapshot = diffableDataSource.snapshot()
+            snapshot.deleteItems([.bottomLoader])
+            diffableDataSource.apply(snapshot)
         }
     }
 }

Mastodon/Scene/Report/Report/ReportViewController.swift

@@ -0,0 +1,206 @@
+//
+//  ReportViewController.swift
+//  Mastodon
+//
+//  Created by ihugo on 2021/4/20.
+//
+
+import os.log
+import UIKit
+import Combine
+import CoreDataStack
+import MastodonAsset
+import MastodonLocalization
+
+class ReportViewController: UIViewController, NeedsDependency, ReportViewControllerAppearance {
+    
+    let logger = Logger(subsystem: "ReportViewController", category: "ViewController")
+
+    var disposeBag = Set<AnyCancellable>()
+    private var observations = Set<NSKeyValueObservation>()
+
+    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
+    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
+    
+    var viewModel: ReportViewModel!
+    
+    lazy var cancelBarButtonItem = UIBarButtonItem(
+        barButtonSystemItem: .cancel,
+        target: self,
+        action: #selector(ReportViewController.cancelBarButtonItemDidPressed(_:))
+    )
+    
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension ReportViewController {
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+                
+        setupAppearance()
+        defer { setupNavigationBarBackgroundView() }
+        
+        navigationItem.rightBarButtonItem = cancelBarButtonItem
+
+        viewModel.reportReasonViewModel.delegate = self
+        viewModel.reportServerRulesViewModel.delegate = self
+        viewModel.reportStatusViewModel.delegate = self
+        viewModel.reportSupplementaryViewModel.delegate = self
+        
+        let reportReasonViewController = ReportReasonViewController()
+        reportReasonViewController.context = context
+        reportReasonViewController.coordinator = coordinator
+        reportReasonViewController.viewModel = viewModel.reportReasonViewModel
+        
+        addChild(reportReasonViewController)
+        reportReasonViewController.view.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(reportReasonViewController.view)
+        reportReasonViewController.didMove(toParent: self)
+        NSLayoutConstraint.activate([
+            reportReasonViewController.view.topAnchor.constraint(equalTo: view.topAnchor),
+            reportReasonViewController.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            reportReasonViewController.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            reportReasonViewController.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+    }
+    
+}
+
+extension ReportViewController {
+    
+    @objc private func cancelBarButtonItemDidPressed(_ sender: UIBarButtonItem) {
+        dismiss(animated: true, completion: nil)
+    }
+    
+}
+
+// MARK: - UIAdaptivePresentationControllerDelegate
+extension ReportViewController: UIAdaptivePresentationControllerDelegate {
+    func presentationControllerShouldDismiss(_ presentationController: UIPresentationController) -> Bool {
+        return viewModel.isReportSuccess
+    }
+}
+
+// MARK: - ReportReasonViewControllerDelegate
+extension ReportViewController: ReportReasonViewControllerDelegate {
+    func reportReasonViewController(_ viewController: ReportReasonViewController, nextButtonPressed button: UIButton) {
+        guard let reason = viewController.viewModel.selectReason else { return }
+        switch reason {
+        case .dislike:
+            let reportResultViewModel = ReportResultViewModel(
+                context: context,
+                user: viewModel.user,
+                isReported: false
+            )
+            coordinator.present(
+                scene: .reportResult(viewModel: reportResultViewModel),
+                from: self,
+                transition: .show
+            )
+        case .violateRule:
+            coordinator.present(
+                scene: .reportServerRules(viewModel: viewModel.reportServerRulesViewModel),
+                from: self,
+                transition: .show
+            )
+        case .spam, .other:
+            coordinator.present(
+                scene: .reportStatus(viewModel: viewModel.reportStatusViewModel),
+                from: self,
+                transition: .show
+            )
+        }
+    }
+}
+
+// MARK: - ReportServerRulesViewControllerDelegate
+extension ReportViewController: ReportServerRulesViewControllerDelegate {
+    func reportServerRulesViewController(_ viewController: ReportServerRulesViewController, nextButtonPressed button: UIButton) {
+        if viewController.viewModel.isDislike {
+            let reportResultViewModel = ReportResultViewModel(
+                context: context,
+                user: viewModel.user,
+                isReported: false
+            )
+            coordinator.present(
+                scene: .reportResult(viewModel: reportResultViewModel),
+                from: self,
+                transition: .show
+            )
+        } else if viewController.viewModel.selectRule != nil {
+            coordinator.present(
+                scene: .reportStatus(viewModel: viewModel.reportStatusViewModel),
+                from: self,
+                transition: .show
+            )            
+        } else {
+            assertionFailure()
+        }
+    }
+}
+
+// MARK: - ReportStatusViewControllerDelegate
+extension ReportViewController: ReportStatusViewControllerDelegate {
+    func reportStatusViewController(_ viewController: ReportStatusViewController, skipButtonDidPressed button: UIButton) {
+        coordinateToReportSupplementary()
+    }
+    
+    func reportStatusViewController(_ viewController: ReportStatusViewController, nextButtonDidPressed button: UIButton) {
+        coordinateToReportSupplementary()
+    }
+    
+    private func coordinateToReportSupplementary() {
+        coordinator.present(
+            scene: .reportSupplementary(viewModel: viewModel.reportSupplementaryViewModel),
+            from: self,
+            transition: .show
+        )
+    }
+}
+
+// MARK: - ReportSupplementaryViewControllerDelegate
+extension ReportViewController: ReportSupplementaryViewControllerDelegate {
+    func reportSupplementaryViewController(_ viewController: ReportSupplementaryViewController, skipButtonDidPressed button: UIButton) {
+        report()
+    }
+    
+    func reportSupplementaryViewController(_ viewController: ReportSupplementaryViewController, nextButtonDidPressed button: UIButton) {
+        report()
+    }
+    
+    private func report() {
+        Task { @MainActor in
+            do {
+                let _ = try await viewModel.report()
+                logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): report success")
+                
+                let reportResultViewModel = ReportResultViewModel(
+                    context: context,
+                    user: viewModel.user,
+                    isReported: true
+                )
+                
+                coordinator.present(
+                    scene: .reportResult(viewModel: reportResultViewModel),
+                    from: self,
+                    transition: .show
+                )
+                
+            } catch {
+                let alertController = UIAlertController(for: error, title: nil, preferredStyle: .alert)
+                let okAction = UIAlertAction(title: L10n.Common.Controls.Actions.ok, style: .default, handler: nil)
+                alertController.addAction(okAction)
+                self.coordinator.present(
+                    scene: .alertController(alertController: alertController),
+                    from: nil,
+                    transition: .alertController(animated: true, completion: nil)
+                )
+            }
+        }   // end Task
+    }
+    
+}

Mastodon/Scene/Report/Report/ReportViewModel.swift

@@ -0,0 +1,190 @@
+//
+//  ReportViewModel.swift
+//  Mastodon
+//
+//  Created by ihugo on 2021/4/19.
+//
+
+import Combine
+import CoreData
+import CoreDataStack
+import Foundation
+import GameplayKit
+import MastodonSDK
+import OrderedCollections
+import os.log
+import UIKit
+import MastodonLocalization
+
+class ReportViewModel {
+    
+    var disposeBag = Set<AnyCancellable>()
+    
+    let reportReasonViewModel: ReportReasonViewModel
+    let reportServerRulesViewModel: ReportServerRulesViewModel
+    let reportStatusViewModel: ReportStatusViewModel
+    let reportSupplementaryViewModel: ReportSupplementaryViewModel
+
+    // input
+    let context: AppContext
+    let user: ManagedObjectRecord<MastodonUser>
+    let status: ManagedObjectRecord<Status>?
+    
+    // output
+    @Published var isReporting = false
+    @Published var isReportSuccess = false
+    
+    init(
+        context: AppContext,
+        user: ManagedObjectRecord<MastodonUser>,
+        status: ManagedObjectRecord<Status>?
+    ) {
+        self.context = context
+        self.user = user
+        self.status = status
+        self.reportReasonViewModel = ReportReasonViewModel(context: context)
+        self.reportServerRulesViewModel = ReportServerRulesViewModel(context: context)
+        self.reportStatusViewModel = ReportStatusViewModel(context: context, user: user, status: status)
+        self.reportSupplementaryViewModel = ReportSupplementaryViewModel(context: context, user: user)
+        // end init
+        
+        guard let authenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else {
+            return
+        }
+        
+        // setup reason viewModel
+        if status != nil {
+            reportReasonViewModel.headline = L10n.Scene.Report.StepOne.whatsWrongWithThisPost
+        } else {
+            Task { @MainActor in
+                let managedObjectContext = context.managedObjectContext
+                let _username: String? = try? await managedObjectContext.perform {
+                    let user = user.object(in: managedObjectContext)
+                    return user?.acctWithDomain
+                }
+                if let username = _username {
+                    reportReasonViewModel.headline = L10n.Scene.Report.StepOne.whatsWrongWithThisUsername(username)
+                } else {
+                    reportReasonViewModel.headline = L10n.Scene.Report.StepOne.whatsWrongWithThisAccount
+                }
+            }   // end Task
+        }
+        
+        // bind server rules
+        Task { @MainActor in
+            do {
+                let response = try await context.apiService.instance(domain: authenticationBox.domain)
+                    .timeout(3, scheduler: DispatchQueue.main)
+                    .singleOutput()
+                let rules = response.value.rules ?? []
+                reportReasonViewModel.serverRules = rules
+                reportServerRulesViewModel.serverRules = rules
+            } catch {
+                reportReasonViewModel.serverRules = []
+                reportServerRulesViewModel.serverRules = []
+            }
+        }   // end Task
+        
+        $isReporting
+            .assign(to: &reportSupplementaryViewModel.$isBusy)
+    }
+
+}
+
+extension ReportViewModel {
+    @MainActor
+    func report() async throws {
+        guard let authenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value,
+              !isReporting
+        else {
+            assertionFailure()
+            return
+        }
+
+        let managedObjectContext = context.managedObjectContext
+        let _query: Mastodon.API.Reports.FileReportQuery? = try await managedObjectContext.perform {
+            guard let user = self.user.object(in: managedObjectContext) else { return nil }
+            
+            // the status picker is essential step in report flow
+            // only check isSkip or not
+            let statusIDs: [Status.ID]? = {
+                if self.reportStatusViewModel.isSkip {
+                    let _id: Status.ID? = self.reportStatusViewModel.status.flatMap { record -> Status.ID? in
+                        guard let status = record.object(in: managedObjectContext) else { return nil }
+                        return status.id
+                    }
+                    return _id.flatMap { [$0] }
+                } else {
+                    return self.reportStatusViewModel.selectStatuses.compactMap { record -> Status.ID? in
+                        guard let status = record.object(in: managedObjectContext) else { return nil }
+                        return status.id
+                    }
+                }
+            }()
+            
+            // the user comment is essential step in report flow
+            // only check isSkip or not
+            let comment: String? = {
+                var suffixes: [String] = []
+                let content: String?
+                
+                // the server rules is NOT essential step in report flow
+                // append suffix depends which reason
+                if let reason = self.reportReasonViewModel.selectReason {
+                    switch reason {
+                    case .spam:
+                        suffixes.append(reason.rawValue)
+                    case .violateRule:
+                        suffixes.append(reason.rawValue)
+                        if let rule = self.reportServerRulesViewModel.selectRule {
+                            suffixes.append(rule.text)
+                        } else {
+                            assertionFailure("should select valid rule")
+                        }
+                    case .dislike:
+                        assertionFailure("should not enter the report flow")
+                    case .other:
+                        break
+                    }
+                }
+                    
+                content = self.reportSupplementaryViewModel.isSkip ? nil : self.reportSupplementaryViewModel.commentContext.comment
+                
+                let suffix: String? = {
+                    let text = suffixes.joined(separator: ". ")
+                    guard !text.isEmpty else { return nil }
+                    return "<" + text + ">"
+                }()
+                
+                let comment = [content, suffix]
+                    .compactMap { $0 }
+                    .joined(separator: " ")
+                return comment.isEmpty ? nil : comment
+            }()
+            return Mastodon.API.Reports.FileReportQuery(
+                accountID: user.id,
+                statusIDs: statusIDs,
+                comment: comment,
+                forward: true
+            )
+        }
+
+        guard let query = _query else { return }
+
+        do {
+            isReporting = true
+            #if DEBUG
+            try await Task.sleep(nanoseconds: .second * 3)
+            #else
+            let _ = try await context.apiService.report(
+                query: query,
+                authenticationBox: authenticationBox
+            )
+            #endif
+            isReportSuccess = true
+        } catch {
+            isReporting = false
+            throw error
+        }
+    }
+}

Mastodon/Scene/Report/ReportReason/ReportReasonView.swift

@@ -0,0 +1,112 @@
+//
+//  ReportReasonView.swift
+//  Mastodon
+//
+//  Created by MainasuK on 2022-5-10.
+//
+
+import UIKit
+import SwiftUI
+import MastodonLocalization
+import MastodonSDK
+import MastodonAsset
+
+struct ReportReasonView: View {
+    
+    @ObservedObject var viewModel: ReportReasonViewModel
+    
+    var body: some View {
+        ScrollView(.vertical) {
+            HStack {
+                VStack(alignment: .leading, spacing: 8) {
+                    Text(L10n.Scene.Report.StepOne.step1Of4)
+                        .foregroundColor(Color(Asset.Colors.Label.secondary.color))
+                        .font(Font(UIFontMetrics(forTextStyle: .largeTitle).scaledFont(for: .systemFont(ofSize: 17, weight: .regular)) as CTFont))
+                    Text(viewModel.headline)
+                        .foregroundColor(Color(Asset.Colors.Label.primary.color))
+                        .font(Font(UIFontMetrics(forTextStyle: .largeTitle).scaledFont(for: .systemFont(ofSize: 28, weight: .bold)) as CTFont))
+                    Text(L10n.Scene.Report.StepOne.selectTheBestMatch)
+                        .foregroundColor(Color(Asset.Colors.Label.secondary.color))
+                        .font(Font(UIFontMetrics(forTextStyle: .largeTitle).scaledFont(for: .systemFont(ofSize: 17, weight: .regular)) as CTFont))
+                }
+                Spacer()
+            }
+            .padding()
+            
+            VStack(spacing: 16) {
+                if let serverRules = viewModel.serverRules {
+                    ForEach(ReportReasonViewModel.Reason.allCases, id: \.self) { reason in
+                        switch reason {
+                        case .violateRule where serverRules.isEmpty:
+                            EmptyView()
+                        default:
+                            ReportReasonRowView(reason: reason, isSelect: reason == viewModel.selectReason)
+                                .background(
+                                    Color(viewModel.backgroundColor)
+                                )
+                                .onTapGesture {
+                                    viewModel.selectReason = reason
+                                }
+                        }
+                    }
+                } else {
+                    ProgressView()
+                }
+            }
+            .padding()
+            .transition(.opacity)
+            .animation(.easeInOut)
+            
+            Spacer()
+                .frame(minHeight: viewModel.bottomPaddingHeight)
+        }
+        .background(
+            Color(viewModel.backgroundColor)
+        )
+    }
+
+}
+
+struct ReportReasonRowView: View {
+    
+    var reason: ReportReasonViewModel.Reason
+    var isSelect: Bool
+    
+    var body: some View {
+        HStack(spacing: 14) {
+            Image(systemName: isSelect ? "checkmark.circle.fill" : "circle")
+                .resizable()
+                .frame(width: 28, height: 28, alignment: .center)
+            VStack(alignment: .leading, spacing: 4) {
+                Text(reason.title)
+                    .foregroundColor(Color(Asset.Colors.Label.primary.color))
+                    .font(.headline)
+                Text(reason.subtitle)
+                    .font(.subheadline)
+                    .foregroundColor(Color(Asset.Colors.Label.secondary.color))
+            }
+            Spacer()
+        }
+    }
+
+}
+
+#if DEBUG
+struct ReportReasonView_Previews: PreviewProvider {
+    static var previews: some View {
+        Group {
+            NavigationView {
+                ReportReasonView(viewModel: ReportReasonViewModel(context: .shared))
+                    .navigationBarTitle(Text(""))
+                    .navigationBarTitleDisplayMode(.inline)
+            }
+            NavigationView {
+                ReportReasonView(viewModel: ReportReasonViewModel(context: .shared))
+                    .navigationBarTitle(Text(""))
+                    .navigationBarTitleDisplayMode(.inline)
+            }
+            .preferredColorScheme(.dark)
+        }
+    }
+}
+#endif