Timeline: restore the selected timeline at the next startup (#694)

* Timeline: restore the selected timeline at the next startup

Signed-off-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>

* Rename: UserDefaultas label name

Signed-off-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>

* Timeline: RawRepresentable of TimelineFilter

Signed-off-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>

* Cleanup code

* Supports RemoteTimelineFilter

* Cleanup code

* Safe saves last viewed status

---------

Signed-off-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>
Co-authored-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>

IceCubesApp/App/Tabs/Timeline/TimelineTab.swift

@@ -19,6 +19,8 @@ struct TimelineTab: View {
   @State private var didAppear: Bool = false
   @State private var timeline: TimelineFilter
   @State private var scrollToTopSignal: Int = 0
+  
+  @AppStorage("last_timeline_filter") public var lastTimelineFilter: TimelineFilter = TimelineFilter.home
 
   private let canFilterTimeline: Bool
 
@@ -43,7 +45,11 @@ struct TimelineTab: View {
       routerPath.client = client
       if !didAppear && canFilterTimeline {
         didAppear = true
-        timeline = client.isAuth ? .home : .federated
+        if(client.isAuth) {
+          timeline = lastTimelineFilter
+        } else {
+            timeline = .federated
+        }
       }
       Task {
         await currentAccount.fetchLists()
@@ -53,10 +59,18 @@ struct TimelineTab: View {
       }
     }
     .onChange(of: client.isAuth, perform: { isAuth in
-      timeline = isAuth ? .home : .federated
+      if(client.isAuth) {
+        timeline = lastTimelineFilter
+      } else {
+          timeline = .federated
+      }
     })
     .onChange(of: currentAccount.account?.id, perform: { _ in
-      timeline = client.isAuth && canFilterTimeline ? .home : .federated
+      if(client.isAuth && canFilterTimeline) {
+        timeline = lastTimelineFilter
+      } else {
+          timeline = .federated
+      }
     })
     .onChange(of: $popToRootTab.wrappedValue) { popToRootTab in
       if popToRootTab == .timeline {
@@ -70,6 +84,11 @@ struct TimelineTab: View {
     .onChange(of: currentAccount.account?.id) { _ in
       routerPath.path = []
     }
+    .onChange(of: timeline) { timeline in
+      if(timeline == .home || timeline == .federated || timeline == .local) {
+        lastTimelineFilter = timeline
+      }
+    }
     .withSafariRouter()
     .environmentObject(routerPath)
   }

Packages/Models/Sources/Models/List.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-public struct List: Decodable, Identifiable, Equatable, Hashable {
+public struct List: Codable, Identifiable, Equatable, Hashable {
   public let id: String
   public let title: String
   public let repliesPolicy: String

Packages/Timeline/Sources/Timeline/TimelineFilter.swift

@@ -136,3 +136,168 @@ public enum TimelineFilter: Hashable, Equatable {
     }
   }
 }
+
+extension TimelineFilter: Codable {
+  enum CodingKeys: String, CodingKey {
+    case home
+    case local
+    case federated
+    case trending
+    case hashtag
+    case list
+    case remoteLocal
+    case latest
+  }
+
+  public init(from decoder: Decoder) throws {
+    let container = try decoder.container(keyedBy: CodingKeys.self)
+    let key = container.allKeys.first
+    switch key {
+    case .home:
+      self = .home
+    case .local:
+      self = .local
+    case .federated:
+      self = .federated
+    case .trending:
+      self = .trending
+    case .hashtag:
+      var nestedContainer = try container.nestedUnkeyedContainer(forKey: .hashtag)
+      let tag = try nestedContainer.decode(String.self)
+      let accountId = try nestedContainer.decode(String?.self)
+      self = .hashtag(
+        tag: tag,
+        accountId: accountId
+      )
+    case .list:
+      let list = try container.decode(
+        Models.List.self,
+        forKey: .list
+      )
+      self = .list(list: list)
+    case .remoteLocal:
+      var nestedContainer = try container.nestedUnkeyedContainer(forKey: .remoteLocal)
+      let server = try nestedContainer.decode(String.self)
+      let filter = try nestedContainer.decode(RemoteTimelineFilter.self)
+      self = .remoteLocal(
+        server: server,
+        filter: filter
+      )
+    case .latest:
+      self = .latest
+    default:
+      throw DecodingError.dataCorrupted(
+        DecodingError.Context(
+          codingPath: container.codingPath,
+          debugDescription: "Unabled to decode enum."
+        )
+      )
+    }
+  }
+
+  public func encode(to encoder: Encoder) throws {
+      var container = encoder.container(keyedBy: CodingKeys.self)
+    switch self {
+    case .home:
+      try container.encode(CodingKeys.home.rawValue, forKey: .home)
+    case .local:
+      try container.encode(CodingKeys.local.rawValue, forKey: .local)
+    case .federated:
+      try container.encode(CodingKeys.federated.rawValue, forKey: .federated)
+    case .trending:
+      try container.encode(CodingKeys.trending.rawValue, forKey: .trending)
+    case .hashtag(let tag, let accountId):
+      var nestedContainer = container.nestedUnkeyedContainer(forKey: .hashtag)
+      try nestedContainer.encode(tag)
+      try nestedContainer.encode(accountId)
+    case .list(let list):
+      try container.encode(list, forKey: .list)
+    case .remoteLocal(let server, let filter):
+      var nestedContainer = container.nestedUnkeyedContainer(forKey: .hashtag)
+      try nestedContainer.encode(server)
+      try nestedContainer.encode(filter)
+    case .latest:
+      try container.encode(CodingKeys.latest.rawValue, forKey: .latest)
+    }
+  }
+}
+
+extension TimelineFilter: RawRepresentable {
+  public init?(rawValue: String) {
+    guard let data = rawValue.data(using: .utf8),
+          let result = try? JSONDecoder().decode(TimelineFilter.self, from: data)
+    else {
+      return nil
+    }
+    self = result
+  }
+
+  public var rawValue: String {
+    guard let data = try? JSONEncoder().encode(self),
+          let result = String(data: data, encoding: .utf8)
+    else {
+      return "[]"
+    }
+    return result
+  }
+}
+
+extension RemoteTimelineFilter: Codable {
+  enum CodingKeys: String, CodingKey {
+    case local
+    case federated
+    case trending
+  }
+
+  public init(from decoder: Decoder) throws {
+    let container = try decoder.container(keyedBy: CodingKeys.self)
+    let key = container.allKeys.first
+    switch key {
+    case .local:
+      self = .local
+    case .federated:
+      self = .federated
+    case .trending:
+      self = .trending
+    default:
+        throw DecodingError.dataCorrupted(
+            DecodingError.Context(
+                codingPath: container.codingPath,
+                debugDescription: "Unabled to decode enum."
+            )
+        )
+    }
+  }
+
+  public func encode(to encoder: Encoder) throws {
+      var container = encoder.container(keyedBy: CodingKeys.self)
+    switch self {
+    case .local:
+      try container.encode(CodingKeys.local.rawValue, forKey: .local)
+    case .federated:
+      try container.encode(CodingKeys.federated.rawValue, forKey: .federated)
+    case .trending:
+      try container.encode(CodingKeys.trending.rawValue, forKey: .trending)
+    }
+  }
+}
+
+extension RemoteTimelineFilter: RawRepresentable {
+  public init?(rawValue: String) {
+    guard let data = rawValue.data(using: .utf8),
+          let result = try? JSONDecoder().decode(RemoteTimelineFilter.self, from: data)
+    else {
+      return nil
+    }
+    self = result
+  }
+
+  public var rawValue: String {
+    guard let data = try? JSONEncoder().encode(self),
+          let result = String(data: data, encoding: .utf8)
+    else {
+      return "[]"
+    }
+    return result
+  }
+}