✨ Playback server

lib/services/audio_player/state.dart

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+import 'package:media_kit/media_kit.dart' hide Track;
+import 'package:spotify/spotify.dart' hide Playlist;
+import 'package:rhythm_box/services/audio_player/audio_player.dart';
+
+class AudioPlayerState {
+  final bool playing;
+  final PlaylistMode loopMode;
+  final bool shuffled;
+  final Playlist playlist;
+
+  final List<Track> tracks;
+  final List<String> collections;
+
+  AudioPlayerState({
+    required this.playing,
+    required this.loopMode,
+    required this.shuffled,
+    required this.playlist,
+    required this.collections,
+    List<Track>? tracks,
+  }) : tracks = tracks ??
+            playlist.medias
+                .map((media) => RhythmMedia.fromMedia(media).track)
+                .toList();
+
+  factory AudioPlayerState.fromJson(Map<String, dynamic> json) {
+    return AudioPlayerState(
+      playing: json['playing'],
+      loopMode: PlaylistMode.values.firstWhere(
+        (e) => e.name == json['loopMode'],
+        orElse: () => audioPlayer.loopMode,
+      ),
+      shuffled: json['shuffled'],
+      playlist: Playlist(
+        json['playlist']['medias']
+            .map(
+              (media) => RhythmMedia.fromMedia(Media(
+                media['uri'],
+                extras: media['extras'],
+                httpHeaders: media['httpHeaders'],
+              )),
+            )
+            .cast<Media>()
+            .toList(),
+        index: json['playlist']['index'],
+      ),
+      collections: List<String>.from(json['collections']),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'playing': playing,
+      'loopMode': loopMode.name,
+      'shuffled': shuffled,
+      'playlist': {
+        'medias': playlist.medias
+            .map((media) => {
+                  'uri': media.uri,
+                  'extras': media.extras,
+                  'httpHeaders': media.httpHeaders,
+                })
+            .toList(),
+        'index': playlist.index,
+      },
+      'collections': collections,
+    };
+  }
+
+  AudioPlayerState copyWith({
+    bool? playing,
+    PlaylistMode? loopMode,
+    bool? shuffled,
+    Playlist? playlist,
+    List<String>? collections,
+  }) {
+    return AudioPlayerState(
+      playing: playing ?? this.playing,
+      loopMode: loopMode ?? this.loopMode,
+      shuffled: shuffled ?? this.shuffled,
+      playlist: playlist ?? this.playlist,
+      collections: collections ?? this.collections,
+      tracks: playlist == null ? tracks : null,
+    );
+  }
+
+  Track? get activeTrack {
+    if (playlist.index == -1) return null;
+    return tracks.elementAtOrNull(playlist.index);
+  }
+
+  Media? get activeMedia {
+    if (playlist.index == -1 || playlist.medias.isEmpty) return null;
+    return playlist.medias.elementAt(playlist.index);
+  }
+
+  bool containsTrack(Track track) {
+    return tracks.any((t) => t.id == track.id);
+  }
+
+  bool containsTracks(List<Track> tracks) {
+    return tracks.every(containsTrack);
+  }
+
+  bool containsCollection(String collectionId) {
+    return collections.contains(collectionId);
+  }
+}