AppleMusicPlayBehavior partial implementation

AppleMusicPlayBehavior.ts

export class AppleMusicPlayBehavior implements IPlayBehaviour {
  public TAG: string;
  public playState: PlayStateEnum;
  public playedMs: number;
  public playlist: NowPlayingPlaylistModel = new NowPlayingPlaylistModel();
  public progress: number;
  public trackPlayedLabel: string;
  public trackRemainingLabel: string;
  public volume: number;
  musicKit: MusicKitInstance;

  constructor(private streamingService: StreamingService, private publisher: PublisherService) {
    this.musicKit = AppleMusicKit.getInstance();
  }


  seek(seekToMs: number): void {
      this.isSeeking = true;
      if (seekToMs < 0) {
        seekToMs = 0;
      }
      if (seekToMs > this.playlist.currentTrack.durationMs) {
        return;
      }
      this.playlist.progressMs = seekToMs;
      this.playedMs = this.playlist.progressMs;
      this.progress = Math.min(this.playedMs / Math.floor(this.playlist.currentTrack.durationMs) * 100, 100);

      const playbackTimeDidChangeModel = new PlaybackTimeDidChangeModel();
      playbackTimeDidChangeModel.currentPlaybackDuration = this.playlist.progressMs / 1000;
      playbackTimeDidChangeModel.currentPlaybackTime = this.playlist.currentTrack.durationMs / 1000;
      playbackTimeDidChangeModel.currentPlaybackTimeRemaining = (this.playlist.currentTrack.durationMs - this.playlist.progressMs) / 1000;
      this.setPlaybackLabels(playbackTimeDidChangeModel);

      this.clearSeekRequestTimeout();
      this.setSeekRequestTimeout(seekToMs);
   }
 }