698 lines
25 KiB
Swift
698 lines
25 KiB
Swift
//
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// ComposeContentViewModel.swift
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//
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//
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// Created by MainasuK on 22/9/30.
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//
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import os.log
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import UIKit
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import Combine
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import CoreDataStack
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import Meta
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import MetaTextKit
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import MastodonMeta
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import MastodonCore
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import MastodonSDK
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import MastodonLocalization
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public protocol ComposeContentViewModelDelegate: AnyObject {
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func composeContentViewModel(_ viewModel: ComposeContentViewModel, handleAutoComplete info: ComposeContentViewModel.AutoCompleteInfo) -> Bool
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}
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public final class ComposeContentViewModel: NSObject, ObservableObject {
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let logger = Logger(subsystem: "ComposeContentViewModel", category: "ViewModel")
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var disposeBag = Set<AnyCancellable>()
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// tableViewCell
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let composeReplyToTableViewCell = ComposeReplyToTableViewCell()
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let composeContentTableViewCell = ComposeContentTableViewCell()
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// input
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let context: AppContext
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let kind: Kind
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weak var delegate: ComposeContentViewModelDelegate?
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@Published var viewLayoutFrame = ViewLayoutFrame()
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// author (me)
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@Published var authContext: AuthContext
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// auto-complete info
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@Published var autoCompleteRetryLayoutTimes = 0
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@Published var autoCompleteInfo: AutoCompleteInfo? = nil
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// emoji
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var customEmojiPickerDiffableDataSource: UICollectionViewDiffableDataSource<CustomEmojiPickerSection, CustomEmojiPickerItem>?
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// output
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// limit
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@Published public var maxTextInputLimit = 500
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// content
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public weak var contentMetaText: MetaText? {
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didSet {
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guard let textView = contentMetaText?.textView else { return }
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customEmojiPickerInputViewModel.configure(textInput: textView)
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}
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}
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// for hashtag: "#<hashtag> "
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// for mention: "@<mention> "
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@Published public var initialContent = ""
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@Published public var content = ""
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@Published public var contentWeightedLength = 0
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@Published public var isContentEmpty = true
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@Published public var isContentValid = true
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@Published public var isContentEditing = false
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// content warning
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weak var contentWarningMetaText: MetaText? {
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didSet {
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guard let textView = contentWarningMetaText?.textView else { return }
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customEmojiPickerInputViewModel.configure(textInput: textView)
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}
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}
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@Published public var isContentWarningActive = false
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@Published public var contentWarning = ""
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@Published public var contentWarningWeightedLength = 0 // set 0 when not composing
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@Published public var isContentWarningEditing = false
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// author
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@Published var avatarURL: URL?
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@Published var name: MetaContent = PlaintextMetaContent(string: "")
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@Published var username: String = ""
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// attachment
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@Published public var attachmentViewModels: [AttachmentViewModel] = []
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@Published public var maxMediaAttachmentLimit = 4
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// @Published public internal(set) var isMediaValid = true
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// poll
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@Published public var isPollActive = false
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@Published public var pollOptions: [PollComposeItem.Option] = {
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// initial with 2 options
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var options: [PollComposeItem.Option] = []
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options.append(PollComposeItem.Option())
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options.append(PollComposeItem.Option())
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return options
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}()
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@Published public var pollExpireConfigurationOption: PollComposeItem.ExpireConfiguration.Option = .oneDay
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@Published public var pollMultipleConfigurationOption: PollComposeItem.MultipleConfiguration.Option = false
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@Published public var maxPollOptionLimit = 4
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// emoji
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@Published var isEmojiActive = false
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let customEmojiViewModel: EmojiService.CustomEmojiViewModel?
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let customEmojiPickerInputViewModel = CustomEmojiPickerInputViewModel()
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@Published var isLoadingCustomEmoji = false
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// visibility
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@Published public var visibility: Mastodon.Entity.Status.Visibility
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// UI & UX
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@Published var replyToCellFrame: CGRect = .zero
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@Published var contentCellFrame: CGRect = .zero
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@Published var contentTextViewFrame: CGRect = .zero
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@Published var scrollViewState: ScrollViewState = .fold
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@Published var characterCount: Int = 0
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@Published public private(set) var isPublishBarButtonItemEnabled = true
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@Published var isAttachmentButtonEnabled = false
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@Published var isPollButtonEnabled = false
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@Published public private(set) var shouldDismiss = true
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public init(
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context: AppContext,
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authContext: AuthContext,
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kind: Kind
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) {
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self.context = context
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self.authContext = authContext
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self.kind = kind
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self.visibility = {
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// default private when user locked
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var visibility: Mastodon.Entity.Status.Visibility = {
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guard let author = authContext.mastodonAuthenticationBox.authenticationRecord.object(in: context.managedObjectContext)?.user else {
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return .public
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}
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return author.locked ? .private : .public
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}()
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// set visibility for reply post
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switch kind {
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case .reply(let record):
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context.managedObjectContext.performAndWait {
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guard let status = record.object(in: context.managedObjectContext) else {
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assertionFailure()
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return
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}
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let repliedStatusVisibility = status.visibility
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switch repliedStatusVisibility {
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case .public, .unlisted:
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// keep default
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break
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case .private:
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visibility = .private
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case .direct:
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visibility = .direct
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case ._other:
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assertionFailure()
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break
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}
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}
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default:
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break
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}
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return visibility
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}()
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self.customEmojiViewModel = context.emojiService.dequeueCustomEmojiViewModel(
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for: authContext.mastodonAuthenticationBox.domain
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)
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super.init()
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// end init
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// setup initial value
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switch kind {
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case .reply(let record):
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context.managedObjectContext.performAndWait {
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guard let status = record.object(in: context.managedObjectContext) else {
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assertionFailure()
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return
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}
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let author = authContext.mastodonAuthenticationBox.authenticationRecord.object(in: context.managedObjectContext)?.user
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var mentionAccts: [String] = []
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if author?.id != status.author.id {
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mentionAccts.append("@" + status.author.acct)
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}
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let mentions = status.mentions
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.filter { author?.id != $0.id }
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for mention in mentions {
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let acct = "@" + mention.acct
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guard !mentionAccts.contains(acct) else { continue }
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mentionAccts.append(acct)
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}
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for acct in mentionAccts {
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UITextChecker.learnWord(acct)
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}
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if let spoilerText = status.spoilerText, !spoilerText.isEmpty {
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self.isContentWarningActive = true
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self.contentWarning = spoilerText
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}
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let initialComposeContent = mentionAccts.joined(separator: " ")
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let preInsertedContent: String? = initialComposeContent.isEmpty ? nil : initialComposeContent + " "
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self.initialContent = preInsertedContent ?? ""
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self.content = preInsertedContent ?? ""
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}
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case .hashtag(let hashtag):
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let initialComposeContent = "#" + hashtag
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UITextChecker.learnWord(initialComposeContent)
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let preInsertedContent = initialComposeContent + " "
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self.initialContent = preInsertedContent
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self.content = preInsertedContent
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case .mention(let record):
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context.managedObjectContext.performAndWait {
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guard let user = record.object(in: context.managedObjectContext) else { return }
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let initialComposeContent = "@" + user.acct
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UITextChecker.learnWord(initialComposeContent)
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let preInsertedContent = initialComposeContent + " "
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self.initialContent = preInsertedContent
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self.content = preInsertedContent
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}
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case .post:
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break
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}
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// set limit
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let _configuration: Mastodon.Entity.Instance.Configuration? = {
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var configuration: Mastodon.Entity.Instance.Configuration? = nil
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context.managedObjectContext.performAndWait {
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guard let authentication = authContext.mastodonAuthenticationBox.authenticationRecord.object(in: context.managedObjectContext)
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else { return }
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configuration = authentication.instance?.configuration
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}
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return configuration
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}()
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if let configuration = _configuration {
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// set character limit
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if let maxCharacters = configuration.statuses?.maxCharacters {
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maxTextInputLimit = maxCharacters
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}
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// set media limit
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if let maxMediaAttachments = configuration.statuses?.maxMediaAttachments {
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maxMediaAttachmentLimit = maxMediaAttachments
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}
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// set poll option limit
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if let maxOptions = configuration.polls?.maxOptions {
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maxPollOptionLimit = maxOptions
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}
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// TODO: more limit
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}
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bind()
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}
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deinit {
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
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}
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}
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extension ComposeContentViewModel {
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private func bind() {
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// bind author
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$authContext
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.sink { [weak self] authContext in
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guard let self = self else { return }
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guard let user = authContext.mastodonAuthenticationBox.authenticationRecord.object(in: self.context.managedObjectContext)?.user else { return }
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self.avatarURL = user.avatarImageURL()
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self.name = user.nameMetaContent ?? PlaintextMetaContent(string: user.displayNameWithFallback)
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self.username = user.acctWithDomain
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}
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.store(in: &disposeBag)
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// bind text
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$content
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.map { $0.count }
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.assign(to: &$contentWeightedLength)
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Publishers.CombineLatest(
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$contentWarning,
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$isContentWarningActive
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)
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.map { $1 ? $0.count : 0 }
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.assign(to: &$contentWarningWeightedLength)
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Publishers.CombineLatest3(
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$contentWeightedLength,
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$contentWarningWeightedLength,
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$maxTextInputLimit
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)
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.map { $0 + $1 <= $2 }
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.assign(to: &$isContentValid)
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// bind attachment
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$attachmentViewModels
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.receive(on: DispatchQueue.main)
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.sink { [weak self] _ in
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guard let self = self else { return }
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Task {
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try await self.uploadMediaInQueue()
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}
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}
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.store(in: &disposeBag)
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// bind emoji inputView
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$isEmojiActive.assign(to: &customEmojiPickerInputViewModel.$isCustomEmojiComposing)
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// bind toolbar
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Publishers.CombineLatest3(
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$isPollActive,
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$attachmentViewModels,
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$maxMediaAttachmentLimit
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)
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.receive(on: DispatchQueue.main)
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.sink { [weak self] isPollActive, attachmentViewModels, maxMediaAttachmentLimit in
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guard let self = self else { return }
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let shouldMediaDisable = isPollActive || attachmentViewModels.count >= maxMediaAttachmentLimit
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let shouldPollDisable = attachmentViewModels.count > 0
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self.isAttachmentButtonEnabled = !shouldMediaDisable
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self.isPollButtonEnabled = !shouldPollDisable
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}
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.store(in: &disposeBag)
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// bind status content character count
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Publishers.CombineLatest3(
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$contentWeightedLength,
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$contentWarningWeightedLength,
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$isContentWarningActive
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)
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.map { contentWeightedLength, contentWarningWeightedLength, isContentWarningActive -> Int in
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var count = contentWeightedLength
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if isContentWarningActive {
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count += contentWarningWeightedLength
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}
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return count
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}
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.assign(to: &$characterCount)
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// bind compose bar button item UI state
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let isComposeContentEmpty = $content
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.map { $0.isEmpty }
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let isComposeContentValid = Publishers.CombineLatest(
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$characterCount,
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$maxTextInputLimit
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)
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.map { characterCount, maxTextInputLimit in
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characterCount <= maxTextInputLimit
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}
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let isMediaEmpty = $attachmentViewModels
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.map { $0.isEmpty }
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let isMediaUploadAllSuccess = $attachmentViewModels
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.map { attachmentViewModels in
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return Publishers.MergeMany(attachmentViewModels.map { $0.$uploadState })
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.delay(for: 0.5, scheduler: DispatchQueue.main) // convert to outputs with delay. Due to @Published emit before changes
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.map { _ in attachmentViewModels.map { $0.uploadState } }
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}
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.switchToLatest()
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.map { outputs in
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guard outputs.allSatisfy({ $0 == .finish }) else { return false }
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return true
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}
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let isPollOptionsAllValid = $pollOptions
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.map { options in
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return Publishers.MergeMany(options.map { $0.$text })
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.delay(for: 0.5, scheduler: DispatchQueue.main) // convert to outputs with delay. Due to @Published emit before changes
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.map { _ in options.map { $0.text } }
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}
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.switchToLatest()
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.map { outputs in
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return outputs.allSatisfy { !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }
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}
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let isPublishBarButtonItemEnabledPrecondition1 = Publishers.CombineLatest4(
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isComposeContentEmpty,
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isComposeContentValid,
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isMediaEmpty,
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isMediaUploadAllSuccess
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)
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.map { isComposeContentEmpty, isComposeContentValid, isMediaEmpty, isMediaUploadAllSuccess -> Bool in
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if isMediaEmpty {
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return isComposeContentValid && !isComposeContentEmpty
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} else {
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return isComposeContentValid && isMediaUploadAllSuccess
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}
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}
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.eraseToAnyPublisher()
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let isPublishBarButtonItemEnabledPrecondition2 = Publishers.CombineLatest4(
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isComposeContentEmpty,
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isComposeContentValid,
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$isPollActive,
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isPollOptionsAllValid
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)
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.map { isComposeContentEmpty, isComposeContentValid, isPollComposing, isPollOptionsAllValid -> Bool in
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if isPollComposing {
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return isComposeContentValid && !isComposeContentEmpty && isPollOptionsAllValid
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} else {
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return isComposeContentValid && !isComposeContentEmpty
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}
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}
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.eraseToAnyPublisher()
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Publishers.CombineLatest(
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isPublishBarButtonItemEnabledPrecondition1,
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isPublishBarButtonItemEnabledPrecondition2
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)
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.map { $0 && $1 }
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.assign(to: &$isPublishBarButtonItemEnabled)
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// bind modal dismiss state
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$content
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.receive(on: DispatchQueue.main)
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.map { content in
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if content.isEmpty {
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return true
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}
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// if the trimmed content equal to initial content
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return content.trimmingCharacters(in: .whitespacesAndNewlines) == self.initialContent
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}
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.assign(to: &$shouldDismiss)
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}
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}
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extension ComposeContentViewModel {
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public enum Kind {
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case post
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case hashtag(hashtag: String)
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case mention(user: ManagedObjectRecord<MastodonUser>)
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case reply(status: ManagedObjectRecord<Status>)
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}
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public enum ScrollViewState {
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case fold // snap to input
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case expand // snap to reply
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}
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}
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extension ComposeContentViewModel {
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public struct AutoCompleteInfo {
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// model
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let inputText: Substring
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// range
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let symbolRange: Range<String.Index>
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let symbolString: Substring
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let toCursorRange: Range<String.Index>
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let toCursorString: Substring
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let toHighlightEndRange: Range<String.Index>
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let toHighlightEndString: Substring
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// geometry
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var textBoundingRect: CGRect = .zero
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var symbolBoundingRect: CGRect = .zero
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}
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}
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extension ComposeContentViewModel {
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func createNewPollOptionIfCould() {
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
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guard pollOptions.count < maxPollOptionLimit else { return }
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let option = PollComposeItem.Option()
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option.shouldBecomeFirstResponder = true
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pollOptions.append(option)
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}
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}
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extension ComposeContentViewModel {
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public enum ComposeError: LocalizedError {
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case pollHasEmptyOption
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public var errorDescription: String? {
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switch self {
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case .pollHasEmptyOption:
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return L10n.Scene.Compose.Poll.thePollIsInvalid
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}
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}
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public var failureReason: String? {
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switch self {
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case .pollHasEmptyOption:
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return L10n.Scene.Compose.Poll.thePollHasEmptyOption
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}
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}
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}
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public func statusPublisher() throws -> StatusPublisher {
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let authContext = self.authContext
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// author
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let managedObjectContext = self.context.managedObjectContext
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var _author: ManagedObjectRecord<MastodonUser>?
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managedObjectContext.performAndWait {
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_author = authContext.mastodonAuthenticationBox.authenticationRecord.object(in: managedObjectContext)?.user.asRecrod
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}
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guard let author = _author else {
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throw AppError.badAuthentication
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}
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// poll
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_ = try {
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guard isPollActive else { return }
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let isAllNonEmpty = pollOptions
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.map { $0.text }
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.allSatisfy { !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }
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guard isAllNonEmpty else {
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throw ComposeError.pollHasEmptyOption
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}
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}()
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return MastodonStatusPublisher(
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author: author,
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replyTo: {
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switch self.kind {
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case .reply(let status): return status
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default: return nil
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}
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}(),
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isContentWarningComposing: isContentWarningActive,
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contentWarning: contentWarning,
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content: content,
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isMediaSensitive: isContentWarningActive,
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attachmentViewModels: attachmentViewModels,
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isPollComposing: isPollActive,
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pollOptions: pollOptions,
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pollExpireConfigurationOption: pollExpireConfigurationOption,
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pollMultipleConfigurationOption: pollMultipleConfigurationOption,
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visibility: visibility
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)
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} // end func publisher()
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}
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extension ComposeContentViewModel {
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public enum AttachmentPrecondition: Error, LocalizedError {
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case videoAttachWithPhoto
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case moreThanOneVideo
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public var errorDescription: String? {
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return L10n.Common.Alerts.PublishPostFailure.title
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}
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public var failureReason: String? {
|
|
switch self {
|
|
case .videoAttachWithPhoto:
|
|
return L10n.Common.Alerts.PublishPostFailure.AttachmentsMessage.videoAttachWithPhoto
|
|
case .moreThanOneVideo:
|
|
return L10n.Common.Alerts.PublishPostFailure.AttachmentsMessage.moreThanOneVideo
|
|
}
|
|
}
|
|
}
|
|
|
|
// check exclusive limit:
|
|
// - up to 1 video
|
|
// - up to N photos
|
|
public func checkAttachmentPrecondition() throws {
|
|
let attachmentViewModels = self.attachmentViewModels
|
|
guard !attachmentViewModels.isEmpty else { return }
|
|
|
|
var photoAttachmentViewModels: [AttachmentViewModel] = []
|
|
var videoAttachmentViewModels: [AttachmentViewModel] = []
|
|
attachmentViewModels.forEach { attachmentViewModel in
|
|
guard let output = attachmentViewModel.output else {
|
|
assertionFailure()
|
|
return
|
|
}
|
|
switch output {
|
|
case .image:
|
|
photoAttachmentViewModels.append(attachmentViewModel)
|
|
case .video:
|
|
videoAttachmentViewModels.append(attachmentViewModel)
|
|
}
|
|
}
|
|
|
|
if !videoAttachmentViewModels.isEmpty {
|
|
guard videoAttachmentViewModels.count == 1 else {
|
|
throw AttachmentPrecondition.moreThanOneVideo
|
|
}
|
|
guard photoAttachmentViewModels.isEmpty else {
|
|
throw AttachmentPrecondition.videoAttachWithPhoto
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// MARK: - DeleteBackwardResponseTextFieldRelayDelegate
|
|
extension ComposeContentViewModel: DeleteBackwardResponseTextFieldRelayDelegate {
|
|
|
|
func deleteBackwardResponseTextFieldDidReturn(_ textField: DeleteBackwardResponseTextField) {
|
|
let index = textField.tag
|
|
if index + 1 == pollOptions.count {
|
|
createNewPollOptionIfCould()
|
|
} else if index < pollOptions.count {
|
|
pollOptions[index + 1].textField?.becomeFirstResponder()
|
|
}
|
|
}
|
|
|
|
func deleteBackwardResponseTextField(_ textField: DeleteBackwardResponseTextField, textBeforeDelete: String?) {
|
|
guard (textBeforeDelete ?? "").isEmpty else {
|
|
// do nothing when not empty
|
|
return
|
|
}
|
|
|
|
let index = textField.tag
|
|
guard index > 0 else {
|
|
// do nothing at first row
|
|
return
|
|
}
|
|
|
|
func optionBeforeRemoved() -> PollComposeItem.Option? {
|
|
guard index > 0 else { return nil }
|
|
let indexBeforeRemoved = pollOptions.index(before: index)
|
|
let itemBeforeRemoved = pollOptions[indexBeforeRemoved]
|
|
return itemBeforeRemoved
|
|
|
|
}
|
|
|
|
func optionAfterRemoved() -> PollComposeItem.Option? {
|
|
guard index < pollOptions.count - 1 else { return nil }
|
|
let indexAfterRemoved = pollOptions.index(after: index)
|
|
let itemAfterRemoved = pollOptions[indexAfterRemoved]
|
|
return itemAfterRemoved
|
|
}
|
|
|
|
// move first responder
|
|
let _option = optionBeforeRemoved() ?? optionAfterRemoved()
|
|
_option?.textField?.becomeFirstResponder()
|
|
|
|
guard pollOptions.count > 2 else {
|
|
// remove item when more then 2 options
|
|
return
|
|
}
|
|
pollOptions.remove(at: index)
|
|
}
|
|
|
|
}
|
|
|
|
// MARK: - AttachmentViewModelDelegate
|
|
extension ComposeContentViewModel: AttachmentViewModelDelegate {
|
|
|
|
public func attachmentViewModel(
|
|
_ viewModel: AttachmentViewModel,
|
|
uploadStateValueDidChange state: AttachmentViewModel.UploadState
|
|
) {
|
|
Task {
|
|
try await uploadMediaInQueue()
|
|
}
|
|
}
|
|
|
|
@MainActor
|
|
func uploadMediaInQueue() async throws {
|
|
for (i, attachmentViewModel) in attachmentViewModels.enumerated() {
|
|
switch attachmentViewModel.uploadState {
|
|
case .none:
|
|
return
|
|
case .compressing:
|
|
return
|
|
case .ready:
|
|
let count = self.attachmentViewModels.count
|
|
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): upload \(i)/\(count) attachment")
|
|
try await attachmentViewModel.upload()
|
|
return
|
|
case .uploading:
|
|
return
|
|
case .fail:
|
|
return
|
|
case .finish:
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
|
|
public func attachmentViewModel(
|
|
_ viewModel: AttachmentViewModel,
|
|
actionButtonDidPressed action: AttachmentViewModel.Action
|
|
) {
|
|
switch action {
|
|
case .retry:
|
|
Task {
|
|
try await viewModel.upload(isRetry: true)
|
|
}
|
|
case .remove:
|
|
attachmentViewModels.removeAll(where: { $0 === viewModel })
|
|
Task {
|
|
try await uploadMediaInQueue()
|
|
}
|
|
}
|
|
}
|
|
}
|