import 'package:audio_service/audio_service.dart';
import 'package:audio_session/audio_session.dart';
import 'package:equalizer/equalizer.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:freezer/api/cache.dart';
import 'package:freezer/api/deezer.dart';
import 'package:freezer/ui/android_auto.dart';
import 'package:just_audio/just_audio.dart';
import 'package:connectivity/connectivity.dart';
import 'package:path/path.dart' as p;
import 'package:path_provider/path_provider.dart';
import 'package:freezer/translations.i18n.dart';
import 'package:collection/collection.dart';
import 'package:scrobblenaut/scrobblenaut.dart';

import 'definitions.dart';
import '../settings.dart';

import 'dart:io';
import 'dart:async';
import 'dart:convert';

PlayerHelper playerHelper = PlayerHelper();
late AudioHandler audioHandler;

class PlayerHelper {
  late StreamSubscription _customEventSubscription;
  late StreamSubscription _mediaItemSubscription;
  late StreamSubscription _playbackStateStreamSubscription;
  QueueSource? queueSource;
  AudioServiceRepeatMode repeatType = AudioServiceRepeatMode.none;
  Timer? _timer;
  int? audioSession;
  int? _prevAudioSession;
  bool equalizerOpen = false;
  bool _shuffleEnabled = false;
  int _queueIndex = 0;

  //Visualizer
  StreamController _visualizerController = StreamController.broadcast();
  Stream get visualizerStream => _visualizerController.stream;

  /// Find queue index by id
  ///
  /// The function gets more expensive the longer the queue is and the further the element is from the beginning.
  int getQueueIndexFromId() => audioHandler.mediaItem.value == null
      ? -1
      : audioHandler.queue.value
          .indexWhere((mi) => mi.id == audioHandler.mediaItem.value!.id);

  int getQueueIndex() =>
      audioHandler.playbackState.value.queueIndex ?? getQueueIndexFromId();

  int get queueIndex => _queueIndex;

  Future<void> initAudioHandler() async {
    // initialize our audiohandler instance
    audioHandler = await AudioService.init(
      builder: () => AudioPlayerTask(),
      config: AudioServiceConfig(
        notificationColor: settings.primaryColor,
        androidStopForegroundOnPause: false,
        androidNotificationOngoing: false,
        androidNotificationClickStartsActivity: true,
        androidNotificationChannelDescription: 'Freezer',
        androidNotificationChannelName: 'Freezer',
        androidNotificationIcon: 'drawable/ic_logo',
        preloadArtwork: false,
      ),
    );
  }

  Future<void> start() async {
    audioHandler.customAction(
        'start', {'ignoreInterruptions': settings.ignoreInterruptions});
    //Subscribe to custom events
    _customEventSubscription = audioHandler.customEvent.listen((event) async {
      if (!(event is Map)) return;
      switch (event['action']) {
        case 'onLoad':
          //After audio_service is loaded, load queue, set quality
          await settings.updateAudioServiceQuality();
          await audioHandler.customAction('load');
          await authorizeLastFM();
          break;
        case 'onRestore':
          //Load queueSource from isolate
          this.queueSource = QueueSource.fromJson(event['queueSource']);
          repeatType = AudioServiceRepeatMode.values[event['loopMode']];
          _queueIndex = getQueueIndex();
          break;
        case 'queueEnd':
          //If last song is played, load more queue
          this.queueSource = QueueSource.fromJson(event['queueSource']);
//          onQueueEnd();
          break;
        case 'screenAndroidAuto':
          AndroidAuto androidAuto = AndroidAuto();
          List<MediaItem> data = await androidAuto.getScreen(event['id']);
          await audioHandler
              .customAction('screenAndroidAuto', {'val': jsonEncode(data)});
          break;
        case 'tracksAndroidAuto':
          AndroidAuto androidAuto = AndroidAuto();
          await androidAuto.playItem(event['id']);
          break;
        case 'audioSession':
          if (!settings.enableEqualizer) break;
          //Save
          _prevAudioSession = audioSession;
          audioSession = event['id'];
          if (audioSession == null) break;
          //Open EQ
          if (!equalizerOpen) {
            Equalizer.open(event['id']);
            equalizerOpen = true;
            break;
          }
          //Change session id
          if (_prevAudioSession != audioSession) {
            if (_prevAudioSession != null)
              Equalizer.removeAudioSessionId(_prevAudioSession!);
            Equalizer.setAudioSessionId(audioSession!);
          }
          break;
        //Visualizer data
        case 'visualizer':
          _visualizerController.add(event['data']);
          break;
      }
    });
    _mediaItemSubscription = audioHandler.mediaItem.listen((mediaItem) async {
      if (mediaItem == null) return;
      final queue = audioHandler.queue.value;
      final nextIndex = (_queueIndex + 1) % queue.length;
      print('animating $nextIndex');
      _queueIndex = getQueueIndex();
      //Load more flow if last song (not using .last since it iterates through previous elements first)
      if (mediaItem.id == queue[queue.length - 1].id) await onQueueEnd();

      //Save queue
      await audioHandler.customAction('saveQueue', {});
      //Add to history
      if (cache.history.length > 0 && cache.history.last.id == mediaItem.id)
        return;
      cache.history.add(Track.fromMediaItem(mediaItem));
      cache.save();
    });

    //Logging listen timer
    _timer = Timer.periodic(Duration(seconds: 2), (timer) async {
      if (audioHandler.mediaItem.value == null ||
          !audioHandler.playbackState.value.playing) return;
      if (audioHandler.playbackState.value.position.inSeconds >
          (audioHandler.mediaItem.value!.duration!.inSeconds * 0.75)) {
        if (cache.loggedTrackId == audioHandler.mediaItem.value!.id) return;
        cache.loggedTrackId = audioHandler.mediaItem.value!.id;
        await cache.save();

        //Log to Deezer
        if (settings.logListen!) {
          deezerAPI.logListen(audioHandler.mediaItem.value!.id);
        }
      }
    });

    //Start audio_service
    // await startService(); it is already ready, there is no need to start it
  }

  Future authorizeLastFM() async {
    if (settings.lastFMUsername == null || settings.lastFMPassword == null)
      return;
    await audioHandler.customAction('authorizeLastFM', {
      'username': settings.lastFMUsername,
      'password': settings.lastFMPassword
    });
  }

  Future<bool> toggleShuffle() async {
    await audioHandler.setShuffleMode((_shuffleEnabled = !_shuffleEnabled)
        ? AudioServiceShuffleMode.all
        : AudioServiceShuffleMode.none);
    return _shuffleEnabled;
  }

  bool get shuffleEnabled => _shuffleEnabled;

  //Repeat toggle
  Future changeRepeat() async {
    //Change to next repeat type
    repeatType = repeatType == AudioServiceRepeatMode.all
        ? AudioServiceRepeatMode.none
        : repeatType == AudioServiceRepeatMode.none
            ? AudioServiceRepeatMode.one
            : AudioServiceRepeatMode.all;
    //Set repeat type
    await audioHandler.setRepeatMode(repeatType);
  }

  //Executed before exit
  Future onExit() async {
    _customEventSubscription.cancel();
    _playbackStateStreamSubscription.cancel();
    _mediaItemSubscription.cancel();
  }

  //Replace queue, play specified track id
  Future _loadQueuePlay(List<MediaItem> queue, String? trackId) async {
    await settings.updateAudioServiceQuality();
    await audioHandler.customAction(
        'setIndex', {'index': queue.indexWhere((m) => m.id == trackId)});
    await audioHandler.updateQueue(queue);
//    if (queue[0].id != trackId)
//      await AudioService.skipToQueueItem(trackId);
    if (!audioHandler.playbackState.value.playing) audioHandler.play();
  }

  //Called when queue ends to load more tracks
  Future onQueueEnd() async {
    if (queueSource == null) return;

    List<Track>? tracks;
    switch (queueSource!.source) {
      //Flow
      case 'flow':
        tracks = await deezerAPI.flow();
        break;
      //SmartRadio/Artist radio
      case 'smartradio':
        tracks = await (deezerAPI.smartRadio(queueSource!.id!)
            as FutureOr<List<Track>>);
        break;
      //Library shuffle
      case 'libraryshuffle':
        tracks = await deezerAPI.libraryShuffle(
            start: audioHandler.queue.value.length);
        break;
      case 'mix':
        tracks = await deezerAPI.playMix(queueSource!.id);
        // Deduplicate tracks with the same id
        List<String> queueIds =
            audioHandler.queue.value.map((e) => e.id).toList();
        tracks?.removeWhere((track) => queueIds.contains(track.id));
        break;
      default:
        return;
      // print(queueSource.toJson());
    }

    if (tracks == null) {
      throw Exception(
          'Failed to fetch more queue songs (queueSource: ${queueSource!.toJson()})');
    }

    List<MediaItem> mi = tracks.map<MediaItem>((t) => t.toMediaItem()).toList();
    await audioHandler.addQueueItems(mi);
//    AudioService.skipToNext();
  }

  //Play track from album
  Future playFromAlbum(Album album, String trackId) async {
    await playFromTrackList(album.tracks!, trackId,
        QueueSource(id: album.id, text: album.title, source: 'album'));
  }

  //Play mix by track
  Future playMix(String trackId, String trackTitle) async {
    List<Track> tracks = (await deezerAPI.playMix(trackId))!;
    playFromTrackList(
        tracks,
        tracks[0].id,
        QueueSource(
            id: trackId,
            text: 'Mix based on'.i18n + ' $trackTitle',
            source: 'mix'));
  }

  //Play from artist top tracks
  Future playFromTopTracks(
      List<Track> tracks, String trackId, Artist artist) async {
    await playFromTrackList(
        tracks,
        trackId,
        QueueSource(
            id: artist.id, text: 'Top ${artist.name}', source: 'topTracks'));
  }

  Future playFromPlaylist(Playlist playlist, String trackId) async {
    await playFromTrackList(playlist.tracks!, trackId,
        QueueSource(id: playlist.id, text: playlist.title, source: 'playlist'));
  }

  //Play episode from show, load whole show as queue
  Future playShowEpisode(Show show, List<ShowEpisode> episodes,
      {int index = 0}) async {
    QueueSource queueSource =
        QueueSource(id: show.id, text: show.name, source: 'show');
    //Generate media items
    List<MediaItem> queue =
        episodes.map<MediaItem>((e) => e.toMediaItem(show)).toList();

    //Load and play
    // await startService(); // audioservice is ready
    await settings.updateAudioServiceQuality();
    await setQueueSource(queueSource);
    await audioHandler.customAction('setIndex', {'index': index});
    await audioHandler.updateQueue(queue);
    if (!audioHandler.playbackState.value.playing) audioHandler.play();
  }

  //Load tracks as queue, play track id, set queue source
  Future playFromTrackList(
      List<Track?> tracks, String? trackId, QueueSource queueSource) async {
    List<MediaItem> queue =
        tracks.map<MediaItem>((track) => track!.toMediaItem()).toList();
    await setQueueSource(queueSource);
    await _loadQueuePlay(queue, trackId);
  }

  //Load smart track list as queue, start from beginning
  Future playFromSmartTrackList(SmartTrackList stl) async {
    //Load from API if no tracks
    if (stl.tracks == null || stl.tracks!.length == 0) {
      if (settings.offlineMode) {
        Fluttertoast.showToast(
            msg: "Offline mode, can't play flow or smart track lists.".i18n,
            gravity: ToastGravity.BOTTOM,
            toastLength: Toast.LENGTH_SHORT);
        return;
      }

      //Flow songs cannot be accessed by smart track list call
      if (stl.id == 'flow') {
        stl.tracks = await deezerAPI.flow();
      } else {
        stl = await deezerAPI.smartTrackList(stl.id);
      }
    }
    QueueSource queueSource = QueueSource(
        id: stl.id,
        source: (stl.id == 'flow') ? 'flow' : 'smarttracklist',
        text: stl.title ??
            ((stl.id == 'flow') ? 'Flow'.i18n : 'Smart track list'.i18n));
    await playFromTrackList(stl.tracks!, stl.tracks![0].id, queueSource);
  }

  Future setQueueSource(QueueSource queueSource) async {
    this.queueSource = queueSource;
    await audioHandler.customAction('queueSource', queueSource.toJson());
  }

  //Reorder tracks in queue
  Future reorder(int oldIndex, int newIndex) async {
    await audioHandler
        .customAction('reorder', {'oldIndex': oldIndex, 'newIndex': newIndex});
  }

  //Start visualizer
  // Future startVisualizer() async {
  //   await audioHandler.customAction('startVisualizer');
  // }

  //Stop visualizer
  // Future stopVisualizer() async {
  //   await audioHandler.customAction('stopVisualizer');
  // }
}

class AudioPlayerTask extends BaseAudioHandler {
  late AudioPlayer _player;

  //Queue
  List<MediaItem>? _originalQueue;
  int _queueIndex = 0;
  bool _isInitialized = false;
  late ConcatenatingAudioSource _audioSource;

  Seeker? _seeker;

  //Stream subscriptions
  StreamSubscription? _eventSub;
  StreamSubscription? _audioSessionSub;
  StreamSubscription? _visualizerSubscription;

  //Loaded from file/frontend
  int? mobileQuality;
  int? wifiQuality;
  QueueSource? queueSource;
  Duration? _lastPosition;
  AudioServiceRepeatMode _repeatMode = AudioServiceRepeatMode.none;

  Completer<List<MediaItem>>? _androidAutoCallback;
  Scrobblenaut? _scrobblenaut;
  bool _scrobblenautReady = false;
  // Last logged track id
  String? _loggedTrackId;

  MediaItem get currentMediaItem => queue.value[_queueIndex];

  Future onStart(Map<String, dynamic>? params) async {
    final session = await AudioSession.instance;
    session.configure(AudioSessionConfiguration.music());

    if (params?['ignoreInterruptions'] == true) {
      _player = AudioPlayer(handleInterruptions: false);
      session.interruptionEventStream.listen((_) {});
      session.becomingNoisyEventStream.listen((_) {});
    } else
      _player = AudioPlayer();

    //Update track index
    _player.currentIndexStream.listen((index) {
      if (index != null) {
        _queueIndex = index;
        mediaItem.add(currentMediaItem);
      }
    });
    //Update state on all clients on change
    _eventSub = _player.playbackEventStream.listen((event) {
      //Quality string
      if (_queueIndex != -1 && _queueIndex < queue.value.length) {
        Map extras = currentMediaItem.extras!;
        extras['qualityString'] = '';
        queue.value[_queueIndex] =
            currentMediaItem.copyWith(extras: extras as Map<String, dynamic>?);
      }
      //Update
      _broadcastState();
    });
    _player.processingStateStream.listen((state) {
      switch (state) {
        case ProcessingState.completed:
          //Player ended, get more songs
          if (_queueIndex == queue.value.length - 1)
            customEvent.add({
              'action': 'queueEnd',
              'queueSource': (queueSource ?? QueueSource()).toJson()
            });
          break;
        default:
          break;
      }
    });

    //Audio session
    _audioSessionSub = _player.androidAudioSessionIdStream.listen((event) {
      customEvent.add({'action': 'audioSession', 'id': event});
    });

    //Load queue
    // queue.add(_queue);
    customEvent.add({'action': 'onLoad'});
  }

  @override
  Future skipToQueueItem(int index) async {
    _lastPosition = null;

    //Skip in player
    await _player.seek(Duration.zero, index: index);
    _queueIndex = index;
    play();
  }

  @override
  Future play() async {
    _player.play();
    //Restore position on play
    if (_lastPosition != null) {
      seek(_lastPosition);
      _lastPosition = null;
    }

    //LastFM
    if (_scrobblenautReady && currentMediaItem.id != _loggedTrackId) {
      _loggedTrackId = currentMediaItem.id;
      await _scrobblenaut!.track.scrobble(
        track: currentMediaItem.title,
        artist: currentMediaItem.artist!,
        album: currentMediaItem.album,
      );
    }
  }

  @override
  Future pause() => _player.pause();

  @override
  Future seek(Duration? pos) => _player.seek(pos);

  @override
  Future<void> fastForward() =>
      _seekRelative(AudioService.config.fastForwardInterval);

  @override
  Future<void> rewind() => _seekRelative(-AudioService.config.rewindInterval);

  @override
  Future<void> seekForward(bool begin) async => _seekContinuously(begin, 1);

  @override
  Future<void> seekBackward(bool begin) async => _seekContinuously(begin, -1);

  //Remove item from queue
  @override
  Future<void> removeQueueItem(MediaItem mediaItem) async {
    int index = queue.value.indexWhere((m) => m.id == mediaItem.id);
    removeQueueItemAt(index);
  }

  @override
  Future<void> removeQueueItemAt(int index) async {
    if (index <= _queueIndex) {
      _queueIndex--;
    }

    await _audioSource.removeAt(index);

    queue.add(queue.value..removeAt(index));
  }

  @override
  Future<void> skipToNext() async {
    _lastPosition = null;
    if (_queueIndex == queue.value.length - 1) return;
    //Update buffering state
    _queueIndex++;
    await _player.seekToNext();
    _broadcastState();
  }

  @override
  Future<void> skipToPrevious() async {
    if (_queueIndex == 0) return;
    //Update buffering state
    //_skipState = AudioProcessingState.skippingToPrevious;
    //Normal skip to previous
    _queueIndex--;
    await _player.seekToPrevious();
    //_skipState = null;
  }

  @override
  Future<List<MediaItem>> getChildren(String parentMediaId,
      [Map<String, dynamic>? options]) async {
    customEvent.add({'action': 'screenAndroidAuto', 'id': parentMediaId});

    //Wait for data from main thread
    _androidAutoCallback = Completer<List<MediaItem>>();
    final data = await _androidAutoCallback!.future;
    _androidAutoCallback = null;
    return data;
  }

  //While seeking, jump 10s every 1s
  void _seekContinuously(bool begin, int direction) {
    _seeker?.stop();
    if (begin) {
      _seeker = Seeker(_player, Duration(seconds: 10 * direction),
          Duration(seconds: 1), currentMediaItem)
        ..start();
    }
  }

  //Relative seek
  Future _seekRelative(Duration offset) async {
    Duration newPos = _player.position + offset;
    //Out of bounds check
    if (newPos < Duration.zero) newPos = Duration.zero;
    if (newPos > currentMediaItem.duration!)
      newPos = currentMediaItem.duration!;

    await _player.seek(newPos);
  }

  //Update state on all clients
  void _broadcastState() {
    playbackState.add(PlaybackState(
      controls: [
        /*if (_queueIndex != 0)*/ MediaControl.skipToPrevious,
        _player.playing ? MediaControl.pause : MediaControl.play,
        /*if (_queueIndex != _queue!.length - 1)*/ MediaControl.skipToNext,
        //Stop
        // MediaControl(
        //     androidIcon: 'drawable/ic_action_stop',
        //     label: 'stop',
        //     action: MediaAction.stop),
        // i mean, the user can just swipe the notification away to stop
      ],
      systemActions: const {
        MediaAction.seek,
        MediaAction.seekForward,
        MediaAction.seekBackward,
        MediaAction.stop
      },
      processingState: _getProcessingState(),
      playing: _player.playing,
      updatePosition: _player.position,
      bufferedPosition: _player.bufferedPosition,
      speed: _player.speed,
      queueIndex: _queueIndex,
    ));
  }

  //just_audio state -> audio_service state. If skipping, use _skipState
  AudioProcessingState _getProcessingState() {
    return const <ProcessingState, AudioProcessingState>{
          ProcessingState.idle: AudioProcessingState.idle,
          ProcessingState.loading: AudioProcessingState.loading,
          ProcessingState.buffering: AudioProcessingState.buffering,
          ProcessingState.ready: AudioProcessingState.ready,
          ProcessingState.completed: AudioProcessingState.completed
        }[_player.processingState] ??
        AudioProcessingState.idle;
  }

  //Replace current queue
  @override
  Future updateQueue(List<MediaItem> q) async {
    _lastPosition = null;
    //just_audio
    _originalQueue = null;
    _player.stop();
    if (_isInitialized) _audioSource.clear();
    //Filter duplicate IDs
    List<MediaItem> newQueue = q.toSet().toList();

    // broadcast to ui
    queue.add(newQueue);
    //Load
    await _loadQueue();
    //await _player.seek(Duration.zero, index: 0);
  }

  //Load queue to just_audio
  Future _loadQueue() async {
    //Don't reset queue index by starting player
    int? qi = _queueIndex;

    List<AudioSource> sources = [];
    for (int i = 0; i < queue.value.length; i++) {
      AudioSource s = await _mediaItemToAudioSource(queue.value[i]);
      sources.add(s);
    }
    _audioSource = ConcatenatingAudioSource(children: sources);

    //Load in just_audio
    try {
      await _player.setAudioSource(_audioSource,
          initialIndex: qi, initialPosition: Duration.zero);
    } catch (e) {
      //Error loading tracks
    }
    _queueIndex = qi;
    mediaItem.add(currentMediaItem);
  }

  Future<AudioSource> _mediaItemToAudioSource(MediaItem mi) async {
    String? url = await _getTrackUrl(mi);
    final uri = Uri.parse(url);
    if (uri.isScheme('http') || uri.isScheme('https'))
      return ProgressiveAudioSource(uri);
    return AudioSource.uri(uri, tag: mi.id);
  }

  Future<String> _getTrackUrl(MediaItem mediaItem, {int? quality}) async {
    //Check if offline
    String _offlinePath =
        p.join((await getExternalStorageDirectory())!.path, 'offline/');
    File f = File(p.join(_offlinePath, mediaItem.id));
    if (await f.exists()) {
      //return f.path;
      //Stream server URL
      return 'http://localhost:36958/?id=${mediaItem.id}';
    }

    //Show episode direct link
    if (mediaItem.extras!['showUrl'] != null)
      return mediaItem.extras!['showUrl'];

    //Due to current limitations of just_audio, quality fallback moved to DeezerDataSource in ExoPlayer
    //This just returns fake url that contains metadata
    List? playbackDetails = jsonDecode(mediaItem.extras!['playbackDetails']);
    //Quality
    ConnectivityResult conn = await Connectivity().checkConnectivity();
    quality = mobileQuality;
    if (conn == ConnectivityResult.wifi) quality = wifiQuality;

    if ((playbackDetails ?? []).length < 2)
      throw Exception('not enough playback details');
    //String url = 'https://dzcdn.net/?md5=${playbackDetails[0]}&mv=${playbackDetails[1]}&q=${quality.toString()}#${mediaItem.id}';
    String url =
        'http://localhost:36958/?q=$quality&mv=${playbackDetails![1]}&md5origin=${playbackDetails[0]}&id=${mediaItem.id}';
    return url;
  }

  //Custom actions
  @override
  Future customAction(String name, [Map<String, dynamic>? args]) async {
    switch (name) {
      case 'start':
        onStart(args);
        break;
      case 'updateQuality':
        //Pass wifi & mobile quality by custom action
        //Isolate can't access globals
        this.wifiQuality = args!['wifiQuality'];
        this.mobileQuality = args['mobileQuality'];
        break;
      //Update queue source
      case 'queueSource':
        this.queueSource = QueueSource.fromJson(args!);
        break;
      //Looping
      // case 'repeatType':
      //   _loopMode = LoopMode.values[args!['type']];
      //   _player.setLoopMode(_loopMode);
      //   break;
      //Save queue
      case 'saveQueue':
        await this._saveQueue();
        break;
      //Load queue after some initialization in frontend
      case 'load':
        await this._loadQueueFile();
        break;

      //Android audio callback
      case 'screenAndroidAuto':
        if (_androidAutoCallback != null)
          _androidAutoCallback!.complete(
              (args!['value'] as List<Map<String, dynamic>>?)
                  ?.map<MediaItem>(mediaItemFromJson)
                  .toList());
        break;
      //Reorder tracks, args = [old, new]
      case 'reorder':
        final oldIndex = args!['oldIndex']! as int;
        final newIndex = args['newIndex']! as int;
        await _audioSource.move(oldIndex, newIndex);
        queue.add(queue.value..reorder(oldIndex, newIndex));
        _broadcastState();
        break;
      //Set index without affecting playback for loading
      case 'setIndex': // editor's note: i really don't get what this is for
        this._queueIndex = args!['index'];
        break;
      //Start visualizer
      // case 'startVisualizer':
      //   if (_visualizerSubscription != null) break;
      //   _player.startVisualizer(
      //       enableWaveform: false,
      //       enableFft: true,
      //       captureRate: 15000,
      //       captureSize: 128);
      //   _visualizerSubscription = _player.visualizerFftStream.listen((event) {
      //     //Calculate actual values
      //     List<double> out = [];
      //     for (int i = 0; i < event.length / 2; i++) {
      //       int rfk = event[i * 2].toSigned(8);
      //       int ifk = event[i * 2 + 1].toSigned(8);
      //       out.add(log(hypot(rfk, ifk) + 1) / 5.2);
      //     }
      //     AudioServiceBackground.sendCustomEvent(
      //         {"action": "visualizer", "data": out});
      //   });
      //   break;
      // //Stop visualizer
      // case 'stopVisualizer':
      //   if (_visualizerSubscription != null) {
      //     _visualizerSubscription.cancel();
      //     _visualizerSubscription = null;
      //   }
      //   break;
      //Authorize lastfm
      case 'authorizeLastFM':
        final username = args!['username']! as String;
        final password = args['password']! as String;
        try {
          final lastFM = await LastFM.authenticateWithPasswordHash(
              apiKey: 'b6ab5ae967bcd8b10b23f68f42493829',
              apiSecret: '861b0dff9a8a574bec747f9dab8b82bf',
              username: username,
              passwordHash: password);
          _scrobblenaut = Scrobblenaut(lastFM: lastFM);
          _scrobblenautReady = true;
        } catch (e) {
          print(e);
        }
        break;
      case 'disableLastFM':
        _scrobblenaut = null;
        _scrobblenautReady = false;
        break;
    }

    return true;
  }

  @override
  Future onTaskRemoved() => stop();

  @override
  Future onNotificationDeleted() => stop();

  @override
  Future<void> stop() async {
    await _saveQueue();
    _player.stop();
    _eventSub?.cancel();
    _audioSessionSub?.cancel();
    _visualizerSubscription?.cancel();
    await super.stop();
  }

  //Get queue save file path
  Future<String> _getQueuePath() async {
    Directory dir = await getApplicationDocumentsDirectory();
    return p.join(dir.path, 'playback.json');
  }

  //Export queue to JSON
  Future<void> _saveQueue() async {
    if (_queueIndex == 0 && queue.value.length == 0) return;

    String path = await _getQueuePath();
    File f = File(path);
    //Create if doesn't exist
    if (!await File(path).exists()) {
      f = await f.create();
    }
    Map data = {
      'index': _queueIndex,
      'queue': queue.value.map<Map<String, dynamic>>(mediaItemToJson).toList(),
      'position': _player.position.inMilliseconds,
      'queueSource': (queueSource ?? QueueSource()).toJson(),
      'loopMode': _repeatMode.index,
    };
    await f.writeAsString(jsonEncode(data));
  }

  //Restore queue & playback info from path
  Future<bool> _loadQueueFile() async {
    File f = File(await _getQueuePath());
    if (await f.exists()) {
      Map<String, dynamic> json = jsonDecode(await f.readAsString());
      List<MediaItem>? _queue = (json['queue'] as List?)
          ?.cast<Map>()
          .map<MediaItem>(
              (json) => mediaItemFromJson(json.cast<String, dynamic>()))
          .toList();
      _queueIndex = json['index'] ?? 0;
      _lastPosition = Duration(milliseconds: json['position'] ?? 0);
      queueSource = QueueSource.fromJson(json['queueSource'] ?? {});
      _repeatMode = AudioServiceRepeatMode.values[(json['loopMode'] ?? 0)];
      //Restore queue
      if (_queue != null) {
        queue.add(_queue);
        await _loadQueue();
        mediaItem.add(currentMediaItem);
      }
      //Send restored queue source to ui
      customEvent.add({
        'action': 'onRestore',
        'queueSource': (queueSource ?? QueueSource()).toJson(),
        'loopMode': _repeatMode.index
      });
    }

    return true;
  }

  @override
  Future<void> insertQueueItem(int index, MediaItem mi) async {
    //-1 == play next
    if (index == -1) index = _queueIndex + 1;

    queue.add(queue.value..insert(index, mi));
    AudioSource? _newSource = await _mediaItemToAudioSource(mi);
    await _audioSource.insert(index, _newSource);

    _saveQueue();
  }

  //Add at end of queue
  @override
  Future<void> addQueueItem(MediaItem mediaItem,
      {bool shouldSaveQueue = true}) async {
    if (queue.value.indexWhere((m) => m.id == mediaItem.id) != -1) return;

    queue.add(queue.value..add(mediaItem));
    AudioSource _newSource = await _mediaItemToAudioSource(mediaItem);
    await _audioSource.add(_newSource);
    if (shouldSaveQueue) _saveQueue();
  }

  @override
  Future<void> addQueueItems(List<MediaItem> mediaItems) async {
    for (final mediaItem in mediaItems) {
      await addQueueItem(mediaItem, shouldSaveQueue: false);
    }
    _saveQueue();
  }

  @override
  Future<void> playFromMediaId(String mediaId,
      [Map<String, dynamic>? args]) async {
    //Android auto load tracks
    if (mediaId.startsWith(AndroidAuto.prefix)) {
      customEvent.add({
        'action': 'tracksAndroidAuto',
        'id': mediaId.replaceFirst(AndroidAuto.prefix, '')
      });
      return;
    }

    //Does the same thing
    await this
        .skipToQueueItem(queue.value.indexWhere((item) => item.id == mediaId));
  }

  @override
  Future<MediaItem?> getMediaItem(String mediaId) async =>
      queue.value.firstWhereOrNull((mediaItem) => mediaItem.id == mediaId);

  @override
  Future<void> playMediaItem(MediaItem mediaItem) =>
      playFromMediaId(mediaItem.id);

  @override
  Future<void> setRepeatMode(AudioServiceRepeatMode repeatMode) =>
      _player.setLoopMode(repeatMode.toLoopMode());

  @override
  Future<void> setShuffleMode(AudioServiceShuffleMode shuffleMode) async {
    switch (shuffleMode) {
      case AudioServiceShuffleMode.none:
        queue.add(_originalQueue!);
        _originalQueue = null;
        break;
      case AudioServiceShuffleMode.group:
      case AudioServiceShuffleMode.all:
        _originalQueue = List.from(queue.value, growable: false);
        queue.add(queue.value..shuffle());
        break;
    }

    _queueIndex = 0;
    await _player.stop();
    await _loadQueue();
    await _player.play();
  }
}

//Seeker from audio_service example (why reinvent the wheel?)
//While holding seek button, will continuously seek
class Seeker {
  final AudioPlayer? player;
  final Duration positionInterval;
  final Duration stepInterval;
  final MediaItem mediaItem;
  bool _running = false;

  Seeker(this.player, this.positionInterval, this.stepInterval, this.mediaItem);

  Future start() async {
    _running = true;
    while (_running) {
      Duration newPosition = player!.position + positionInterval;
      if (newPosition < Duration.zero) newPosition = Duration.zero;
      if (newPosition > mediaItem.duration!) newPosition = mediaItem.duration!;
      player!.seek(newPosition);
      await Future.delayed(stepInterval);
    }
  }

  void stop() {
    _running = false;
  }
}