feat: now playing chapter track

ios/App/Shared/models/PlaybackSession.swift

@@ -160,3 +160,11 @@ class PlaybackSession: Object, Codable, Deletable {
         try container.encode(localMediaProgressId, forKey: .localMediaProgressId)
     }
 }
+
+extension PlaybackSession {
+    func getCurrentChapter() -> Chapter? {
+        return chapters.first { chapter in
+            chapter.start <= self.currentTime && chapter.end > self.currentTime
+        }
+    }
+}

ios/App/Shared/models/PlayerSettings.swift

@@ -12,6 +12,8 @@ class PlayerSettings: Object {
     // The webapp has a persisted setting for playback speed, but it's not always available to the native code
     // Lets track it natively as well, so we never have a situation where the UI and native player are out of sync
     @Persisted var playbackRate: Float = 1.0
+    @Persisted var chapterTrack: Bool = true
+
     
     // Singleton pattern for Realm objects
     static func main() -> PlayerSettings {

ios/App/Shared/models/server/Chapter.swift

@@ -39,3 +39,13 @@ class Chapter: EmbeddedObject, Codable {
         try container.encode(title, forKey: .title)
     }
 }
+
+extension Chapter {
+    func getRelativeChapterCurrentTime(sessionCurrentTime: Double) -> Double {
+        return sessionCurrentTime - self.start
+    }
+
+    func getRelativeChapterEndTime() -> Double {
+        return self.end - self.start
+    }
+}

ios/App/Shared/player/AudioPlayer.swift

@@ -224,6 +224,8 @@ class AudioPlayer: NSObject {
                     // Update the UI
                     NotificationCenter.default.post(name: NSNotification.Name(PlayerEvents.sleepSet.rawValue), object: nil)
                 }
+                // Update the now playing and chapter info
+                self.updateNowPlaying()
             }
         }
     }
@@ -443,6 +445,10 @@ class AudioPlayer: NSObject {
         }
     }
     
+    public func setChapterTrack() {
+        self.updateNowPlaying()
+    }
+
     public func getCurrentTime() -> Double? {
         guard let playbackSession = self.getPlaybackSession() else { return nil }
         let currentTrackTime = self.audioPlayer.currentTime().seconds
@@ -657,7 +663,16 @@ class AudioPlayer: NSObject {
     }
     private func updateNowPlaying() {
         NotificationCenter.default.post(name: NSNotification.Name(PlayerEvents.update.rawValue), object: nil)
-        if let duration = self.getDuration(), let currentTime = self.getCurrentTime() {
+        if let session = self.getPlaybackSession(), let currentChapter = session.getCurrentChapter(), PlayerSettings.main().chapterTrack {
+                    NowPlayingInfo.shared.update(
+                        duration: currentChapter.getRelativeChapterEndTime(),
+                        currentTime: currentChapter.getRelativeChapterCurrentTime(sessionCurrentTime: session.currentTime),
+                        rate: rate,
+                        chapterName: currentChapter.title,
+                        chapterNumber: (session.chapters.firstIndex(of: currentChapter) ?? 0) + 1,
+                        chapterCount: session.chapters.count
+                    )
+            } else if let duration = self.getDuration(), let currentTime = self.getCurrentTime() {
             NowPlayingInfo.shared.update(duration: duration, currentTime: currentTime, rate: rate)
         }
     }

ios/App/Shared/player/PlayerHandler.swift

@@ -61,6 +61,10 @@ class PlayerHandler {
         self.player?.setPlaybackRate(speed)
     }
     
+    public static func setChapterTrack() {
+        self.player?.setChapterTrack()
+    }
+
     public static func getSleepTimeRemaining() -> Double? {
         return self.player?.getSleepTimeRemaining()
     }

ios/App/Shared/util/NowPlayingInfo.swift

@@ -53,7 +53,7 @@ class NowPlayingInfo {
             self.setMetadata(artwork: artwork, metadata: metadata)
         }
     }
-    public func update(duration: Double, currentTime: Double, rate: Float) {
+    public func update(duration: Double, currentTime: Double, rate: Float, chapterName: String? = nil, chapterNumber: Int? = nil, chapterCount: Int? = nil) {
         // Update on the main to prevent access collisions
         DispatchQueue.main.async { [weak self] in
             if let self = self {
@@ -62,6 +62,18 @@ class NowPlayingInfo {
                 self.nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = rate
                 self.nowPlayingInfo[MPNowPlayingInfoPropertyDefaultPlaybackRate] = 1.0
                     
+                
+                if let chapterName = chapterName, let chapterNumber = chapterNumber, let chapterCount = chapterCount {
+                    self.nowPlayingInfo[MPMediaItemPropertyTitle] = chapterName
+                    self.nowPlayingInfo[MPNowPlayingInfoPropertyChapterNumber] = chapterNumber
+                    self.nowPlayingInfo[MPNowPlayingInfoPropertyChapterCount] = chapterCount
+                } else {
+                    // Set the title back to the book title
+                    self.nowPlayingInfo[MPMediaItemPropertyTitle] = self.nowPlayingInfo[MPMediaItemPropertyAlbumTitle]
+                    self.nowPlayingInfo[MPNowPlayingInfoPropertyChapterNumber] = nil
+                    self.nowPlayingInfo[MPNowPlayingInfoPropertyChapterCount] = nil
+                }
+                
                 MPNowPlayingInfoCenter.default().nowPlayingInfo = self.nowPlayingInfo
             }
         }
@@ -89,7 +101,7 @@ class NowPlayingInfo {
         
         nowPlayingInfo[MPMediaItemPropertyTitle] = metadata!.title
         nowPlayingInfo[MPMediaItemPropertyArtist] = metadata!.author ?? "unknown"
-        nowPlayingInfo[MPMediaItemPropertyAlbumTitle] = metadata!.series
+        nowPlayingInfo[MPMediaItemPropertyAlbumTitle] = metadata!.title
     }
     
     private func shouldFetchCover(id: String) -> Bool {