import 'package:audio_service/audio_service.dart';
import 'package:audio_session/audio_session.dart';
import 'package:equalizer/equalizer.dart';
import 'package:flutter/foundation.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:freezer/api/cache.dart';
import 'package:freezer/api/deezer.dart';
import 'package:freezer/api/deezer_audio_source.dart';
import 'package:freezer/api/offline_audio_source.dart';
import 'package:freezer/api/url_audio_source.dart';
import 'package:freezer/ui/android_auto.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:just_audio/just_audio.dart';
import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:logging/logging.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 'package:rxdart/rxdart.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;
  int? audioSession;
  int? _prevAudioSession;
  bool equalizerOpen = false;
  bool _shuffleEnabled = false;
  int _queueIndex = 0;
  bool _started = false;

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

  final _streamInfoSubject = BehaviorSubject<StreamQualityInfo>();
  ValueStream<StreamQualityInfo> get streamInfo => _streamInfoSubject.stream;

  final _bufferPositionSubject = BehaviorSubject<Duration>();
  ValueStream<Duration> get bufferPosition => _bufferPositionSubject.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 {
    final initArgs = AudioPlayerTaskInitArguments.from(
        settings: settings, deezerAPI: deezerAPI);
    // initialize our audiohandler instance
    audioHandler = await AudioService.init(
      builder: () => AudioPlayerTask(initArgs),
      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 {
    if (_started) return;
    _started = true;
    //Subscribe to custom events
    _customEventSubscription = audioHandler.customEvent.listen((event) async {
      if (event is! Map) return;
      Logger('PlayerHelper').fine("event received: ${event['action']}");
      switch (event['action']) {
        case 'onLoad':
          //After audio_service is loaded, load queue, set quality
          await settings.updateAudioServiceQuality();
          break;
        case 'onRestore':
          //Load queueSource from isolate
          queueSource = event['queueSource'] as QueueSource;
          repeatType = event['repeatMode'] as AudioServiceRepeatMode;
          _queueIndex = getQueueIndex();
          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;
        case 'streamInfo':
          Logger('PlayerHelper').fine("streamInfo received");
          _streamInfoSubject.add(event['data'] as StreamQualityInfo);
          break;
        case 'bufferPosition':
          _bufferPositionSubject.add(event['data'] as Duration);
          break;
      }
    });
    _mediaItemSubscription = audioHandler.mediaItem.listen((mediaItem) async {
      if (mediaItem == null) return;
      _queueIndex = getQueueIndex();
      //Load more flow if last song (not using .last since it iterates through previous elements first)

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

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

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

  Future<bool> toggleShuffle() async {
    _shuffleEnabled = !_shuffleEnabled;
    await audioHandler.setShuffleMode(_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<void> _loadQueuePlay(List<MediaItem> queue, String? trackId) async {
    await settings.updateAudioServiceQuality();

    await audioHandler.customAction('setIndex', {
      'index': trackId == null ? 0 : 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();
  }

  //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<void> 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 {
    final queue = await Future.wait(tracks
        .map<Future<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!.isEmpty) {
      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(stl.flowConfig);
      } else {
        stl = await deezerAPI.smartTrackList(stl.id);
      }
    }
    QueueSource queueSource = QueueSource(
        id: stl.flowConfig ?? 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) => 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 AudioPlayerTaskInitArguments {
  final bool ignoreInterruptions;
  final bool seekAsSkip;
  final DeezerAPI deezerAPI;
  final bool logListen;
  final String? lastFMUsername;
  final String? lastFMPassword;

  AudioPlayerTaskInitArguments({
    required this.deezerAPI,
    required this.ignoreInterruptions,
    required this.seekAsSkip,
    required this.logListen,
    required this.lastFMUsername,
    required this.lastFMPassword,
  });

  static AudioPlayerTaskInitArguments from(
      {required Settings settings, required DeezerAPI deezerAPI}) {
    return AudioPlayerTaskInitArguments(
        deezerAPI: deezerAPI,
        logListen: settings.logListen,
        ignoreInterruptions: settings.ignoreInterruptions,
        seekAsSkip: settings.seekAsSkip,
        lastFMUsername: settings.lastFMUsername,
        lastFMPassword: settings.lastFMPassword);
  }

  static Future<AudioPlayerTaskInitArguments> loadSettings() async {
    final settings = await Settings.load();

    final deezerAPI = DeezerAPI(arl: settings.arl);
    await deezerAPI.authorize();

    return from(settings: settings, deezerAPI: deezerAPI);
  }
}

class AudioPlayerTask extends BaseAudioHandler {
  final _logger = Logger('AudioPlayerTask');

  late AudioPlayer _player;
  late ConcatenatingAudioSource _audioSource;
  late DeezerAPI _deezerAPI;
  late bool _seekAsSkip;

  /// Original queue from shuffle
  List<MediaItem>? _originalQueue;

  /// Current index in queue
  int _queueIndex = 0;

  /// Used to assign unique ids to queue items.
  /// This shall not be decremented, and shall only be reset when the queue is being recreated.
  ///
  /// USE CASE: assigning keys to queue items (for example in [QueueScreen])
  int _queueAutoIncrement = 0;

  //Stream subscriptions
  StreamSubscription? _eventSubscription;
  StreamSubscription? _bufferPositionSubscription;
  StreamSubscription? _audioSessionSubscription;
  StreamSubscription? _visualizerSubscription;
  StreamSubscription? _connectivitySubscription;

  /// Android Auto helper class for navigation
  late final AndroidAuto _androidAuto;

  //Loaded from file/frontendjust
  AudioQuality mobileQuality = AudioQuality.MP3_128;
  AudioQuality wifiQuality = AudioQuality.MP3_128;

  AudioQuality _currentQuality = AudioQuality.MP3_128;

  /// Current queueSource (=> where playback has begun from)
  QueueSource? queueSource;

  /// Last playback position (used for restoring position when player died)
  Duration? _lastPosition;
  AudioServiceRepeatMode _repeatMode = AudioServiceRepeatMode.none;

  /// LastFM API
  Scrobblenaut? _scrobblenaut;

  /// Last logged track id (to avoid duplicates)
  String? _loggedTrackId;

  // deezer track logging
  /// Whether we should send log requests to deezer
  late bool _shouldLogTracks;

  /// Amount of times the song's been paused
  int _amountPaused = 0;

  /// Amount of times the song's been seeked
  int _amountSeeked = 0;

  /// When playback begun
  int? _timestamp;

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

  bool get currentMediaItemIsShow =>
      queue.value.elementAtOrNull(_queueIndex)?.extras?['show'] != null;

  /// Hive playback box (LazyBox = don't keep stuff in RAM)
  late final LazyBox _box;

  AudioPlayerTask([AudioPlayerTaskInitArguments? initArgs]) {
    if (initArgs == null) {
      unawaited(AudioPlayerTaskInitArguments.loadSettings().then(_init));
      return;
    }
    unawaited(_init(initArgs));
  }

  Future<void> _init(AudioPlayerTaskInitArguments initArgs) async {
    _deezerAPI = initArgs.deezerAPI;
    _androidAuto = AndroidAuto(deezerAPI: _deezerAPI);
    _shouldLogTracks = initArgs.logListen;
    _seekAsSkip = initArgs.seekAsSkip;

    final session = await AudioSession.instance;
    session.configure(const AudioSessionConfiguration.music());

    _box = await Hive.openLazyBox('playback',
        path: (await getTemporaryDirectory()).path);

    _player = AudioPlayer(
      handleInterruptions: !initArgs.ignoreInterruptions,
      androidApplyAudioAttributes: true,
      handleAudioSessionActivation: true,
    );

    if (initArgs.ignoreInterruptions) {
      session.interruptionEventStream.listen((_) {});
      session.becomingNoisyEventStream.listen((_) {});
    }

    //Update track index
    _player.currentIndexStream.listen((index) {
      _timestamp = DateTime.now().millisecondsSinceEpoch;
      if (index != null && queue.value.isNotEmpty) {
        _queueIndex = index;
        mediaItem.add(currentMediaItem);
      }

      if (index == queue.value.length - 1) {
        unawaited(_onQueueEnd());
      }
    });
    //Update state on all clients on change
    _eventSubscription = _player.playbackEventStream.listen((event) {
      //Update
      _broadcastState();
    }, onError: (Object e, StackTrace st) {
      _logger.severe('A stream error occurred: $e');
    });
    _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!.toJson()});
          }
          break;
        default:
          break;
      }
    });

    _bufferPositionSubscription =
        _player.bufferedPositionStream.listen((bufferPosition) {
      customEvent.add({'action': 'bufferPosition', 'data': bufferPosition});
    });

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

    //Load queue
    // queue.add(_queue);

    // Determine audio quality to use
    try {
      await Connectivity().checkConnectivity().then(_determineAudioQuality);

      // listen for connectivity changes
      _connectivitySubscription =
          Connectivity().onConnectivityChanged.listen(_determineAudioQuality);
    } catch (e) {
      _logger.warning(
          'Couldn\'t determine connection! Falling back to other (which may use wifi quality)');
      // on error, return dummy value -- error can happen on linux if not using NetworkManager, for example
      _determineAudioQuality(ConnectivityResult.other);
    }

    await _loadQueueFile();

    if (initArgs.lastFMUsername != null && initArgs.lastFMPassword != null) {
      await _authorizeLastFM(
          initArgs.lastFMUsername!, initArgs.lastFMPassword!);
    }

    customEvent.add({'action': 'onLoad'});
  }

  void _determineAudioQuality(ConnectivityResult result) {
    switch (result) {
      case ConnectivityResult.mobile:
      case ConnectivityResult.bluetooth:
        _currentQuality = mobileQuality;
      case ConnectivityResult.other:
        _currentQuality =
            Platform.isLinux || Platform.isLinux || Platform.isMacOS
                ? wifiQuality
                : mobileQuality;
      default:
        _currentQuality = wifiQuality;
    }
  }

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

    unawaited(_logListenedTrack(currentMediaItem));
    //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) {
      _player.seek(_lastPosition);
      _lastPosition = null;
    }

    //LastFM
    if (_queueIndex >= queue.value.length) return;
    if (_scrobblenaut != null && currentMediaItem.id != _loggedTrackId) {
      _loggedTrackId = currentMediaItem.id;
      await _scrobblenaut!.track.scrobble(
        track: currentMediaItem.title,
        artist: currentMediaItem.artist!,
        album: currentMediaItem.album,
        duration: currentMediaItem.duration,
      );
    }
  }

  @override
  Future<void> pause() {
    _amountPaused++;
    return _player.pause();
  }

  @override
  Future<void> seek(Duration? position) {
    _amountSeeked++;
    return _player.seek(position);
  }

  @override
  Future<void> fastForward() {
    print('fast forward called');
    if (currentMediaItemIsShow) {
      return _seekRelative(const Duration(seconds: 30));
    }

    if (_seekAsSkip) return skipToNext();

    return Future.value();
  }

  @override
  Future<void> rewind() {
    print('rewind called');
    if (currentMediaItemIsShow) {
      return _seekRelative(-const Duration(seconds: 30));
    }

    if (_seekAsSkip) return skipToPrevious();

    return Future.value();
  }

  // unused.
  @override
  Future<void> seekForward(bool begin) => Future.value();

  @override
  Future<void> seekBackward(bool begin) async {
    // (un)favourite action
    if (cache.libraryTracks.contains(currentMediaItem.id)) {
      cache.libraryTracks.remove(currentMediaItem.id);
      _broadcastState();
      return _deezerAPI.removeFavorite(currentMediaItem.id);
    }

    cache.libraryTracks.add(currentMediaItem.id);
    _broadcastState();
    return _deezerAPI.addFavoriteTrack(currentMediaItem.id);
  }

  //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
    unawaited(_logListenedTrack(currentMediaItem));
    _queueIndex++;
    await _player.seekToNext();
    _broadcastState();
  }

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

  Future<void> _logListenedTrack(MediaItem mediaItem) async {
    if (!_shouldLogTracks) return;

    //Log to Deezer
    _deezerAPI.logListen(
      mediaItem.id,
      seek: _amountSeeked,
      pause: _amountPaused,
      sync: _amountSeeked == 0 && _amountPaused == 0 ? 1 : 0,
      timestamp: _timestamp,
    );
  }

  @override
  Future<List<MediaItem>> getChildren(String parentMediaId,
      [Map<String, dynamic>? options]) async {
    return await _androidAuto.getScreen(parentMediaId);
  }

  //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);
  }

  MediaControl favoriteControl() {
    if (cache.libraryTracks.contains(currentMediaItem.id)) {
      return const MediaControl(
          androidIcon: 'drawable/ic_heart',
          label: 'unfavorite',
          action: MediaAction.seekBackward);
    }

    return const MediaControl(
      androidIcon: 'drawable/ic_heart_outline',
      label: 'favourite',
      action: MediaAction
          .seekBackward, // this acts as favourite/unfavourite as it's not already used.
    );
  }

  //Update state on all clients
  void _broadcastState() {
    playbackState.add(PlaybackState(
      controls: !currentMediaItemIsShow
          ? [
              if (queue.value.isNotEmpty) favoriteControl(),
              /*if (_queueIndex != 0)*/ MediaControl.skipToPrevious,
              _player.playing ? MediaControl.pause : MediaControl.play,
              /*if (_queueIndex != _queue!.length - 1)*/ MediaControl
                  .skipToNext,
              //Stop -- USELESS.
              // MediaControl(
              //     androidIcon: 'drawable/ic_action_stop',
              //     label: 'stop',
              //     action: MediaAction.stop),
              // i mean, the user can just swipe the notification away to stop
            ]
          : [
              const MediaControl(
                androidIcon: 'drawable/ic_replay_30',
                label: 'replay 30',
                action: MediaAction.rewind,
              ), // acts as prev-30
              _player.playing ? MediaControl.pause : MediaControl.play,
              const MediaControl(
                androidIcon: 'drawable/ic_forward_30',
                label: 'forward 30',
                action: MediaAction.fastForward,
              ), // next-30
            ],
      systemActions: !currentMediaItemIsShow
          ? const {
              MediaAction.seek,
              MediaAction.seekBackward,
              MediaAction.skipToNext,
              MediaAction.skipToPrevious,
              MediaAction.stop
            }
          : const {
              MediaAction.seek,
              MediaAction.fastForward,
              MediaAction.rewind,
              MediaAction.stop,
            },
      processingState: _convertProcessingState(_player.processingState),
      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 _convertProcessingState(
      ProcessingState processingState) {
    return const <ProcessingState, AudioProcessingState>{
      ProcessingState.idle: AudioProcessingState.idle,
      ProcessingState.loading: AudioProcessingState.loading,
      ProcessingState.buffering: AudioProcessingState.buffering,
      ProcessingState.ready: AudioProcessingState.ready,
      ProcessingState.completed: AudioProcessingState.completed,
    }[processingState]!;
  }

  //Replace current queue
  @override
  // ignore: avoid_renaming_method_parameters
  Future updateQueue(List<MediaItem> q) async {
    _lastPosition = null;
    //just_audio
    _originalQueue = null;
    _player.stop();

    // assign unique ids
    _queueAutoIncrement = 0;
    for (var e in q) {
      e.extras!['id'] = _queueAutoIncrement++;
    }
    queue.add(q);
    //Load
    await _loadQueue();
    //await _player.seek(Duration.zero, index: 0); -- will be done in frontend
  }

  //Load queue to just_audio
  Future _loadQueue() async {
    //Don't reset queue index by starting player
    if (!queue.hasValue || queue.value.isEmpty) {
      return;
    }

    final sources =
        await Future.wait(queue.value.map((e) => _mediaItemToAudioSource(e)));

    _audioSource = ConcatenatingAudioSource(
      children: sources,
      // load stuff as late as possible => less data used
      useLazyPreparation: true,
    );

    //Load in just_audio
    try {
      await _player.setAudioSource(_audioSource,
          initialIndex: _queueIndex,
          initialPosition: Duration.zero,
          preload: kIsWeb || defaultTargetPlatform != TargetPlatform.linux);
    } catch (e) {
      //Error loading tracks
    }
    if (_queueIndex != -1) {
      mediaItem.add(currentMediaItem);
    }
  }

  Future<AudioSource> _mediaItemToAudioSource(MediaItem mediaItem) async {
    //Check if offline
    if (Platform.isAndroid) {
      String offlinePath =
          p.join((await getExternalStorageDirectory())!.path, 'offline/');
      File file = File(p.join(offlinePath, mediaItem.id));
      if (await file.exists()) {
        // return Uri.file(f.path);
        //return f.path;
        //Stream server URL
        // return 'http://localhost:36958/?id=${mediaItem.id}';

        // maybe still use [AudioSource.file], but find another way to broadcast stream info so to have less overhead
        return OfflineAudioSource(file,
            onStreamObtained: (streamInfo) =>
                customEvent.add({'action': 'streamInfo', 'data': streamInfo}));
        // return AudioSource.uri(
        //     Uri.http('localhost:36958', '/', {'id': mediaItem.id}));
      }
    }

    //Show episode direct link
    if (mediaItem.extras!['showUrl'] != null) {
      return UrlAudioSource(
        Uri.parse(mediaItem.extras!['showUrl']),
        onStreamObtained: (qualityInfo) =>
            customEvent.add({'action': 'streamInfo', 'data': qualityInfo}),
      );
    }

    //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']);

    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}';
    // final uri = Uri.http('localhost:36958', '', {
    //   if (quality != null) 'q': quality.toString(),
    //   'mv': playbackDetails![1],
    //   'md5origin': playbackDetails[0],
    //   'id': mediaItem.id,
    // });
    // print("url for " + mediaItem.title + ": " + uri.toString());
    // return AudioSource.uri(uri);

    // DON'T use the java backend anymore, useless.
    return DeezerAudioSource(
      getQuality: () => _currentQuality,
      trackId: mediaItem.id,
      md5origin: playbackDetails![0],
      mediaVersion: playbackDetails[1],
      onStreamObtained: (qualityInfo) =>
          customEvent.add({'action': 'streamInfo', 'data': qualityInfo}),
    );
  }

  //Custom actions
  @override
  Future customAction(String name, [Map<String, dynamic>? extras]) async {
    switch (name) {
      case 'updateQuality':
        //Pass wifi & mobile quality by custom action
        //Isolate can't access globals
        wifiQuality = extras!['wifiQuality'] as AudioQuality;
        mobileQuality = extras['mobileQuality'] as AudioQuality;
        break;
      //Update queue source
      case 'queueSource':
        queueSource = QueueSource.fromJson(extras!);
        break;
      //Looping
      // case 'repeatType':
      //   _loopMode = LoopMode.values[args!['type']];
      //   _player.setLoopMode(_loopMode);
      //   break;
      //Save queue
      case 'saveQueue':
        await _saveQueue();
        break;
      //Reorder tracks, args = [old, new]
      case 'reorder':
        final oldIndex = extras!['oldIndex']! as int;
        final newIndex = extras['newIndex']! as int;
        await _audioSource.move(
            oldIndex, oldIndex > newIndex ? newIndex : newIndex - 1);
        queue.add(List.from(queue.value)..reorder(oldIndex, newIndex));
        _broadcastState();
        break;
      //Set index without affecting playback for loading
      case 'setIndex':
        _queueIndex = extras!['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 = extras!['username']! as String;
        final password = extras['password']! as String;
        await _authorizeLastFM(username, password);
        break;
      case 'disableLastFM':
        _scrobblenaut = null;
        break;
    }

    return true;
  }

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

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

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

  //Export queue to -JSON- hive box
  Future<void> _saveQueue() async {
    if (_queueIndex == 0 && queue.value.isEmpty) return;
    await _box.clear();
    await _box.putAll(<String, dynamic>{
      'index': _queueIndex,
      'queue': queue.value,
      'position': _player.position,
      'queueSource': queueSource,
      'repeatMode': _repeatMode,
    });
  }

  //Restore queue & playback info from path
  Future<void> _loadQueueFile() async {
    if (_box.isEmpty) {
      await _loadQueue();
      return;
    }

    final q = ((await _box.get('queue')) as List?)?.cast<MediaItem>();
    _queueIndex = await _box.get('index', defaultValue: 0);
    _lastPosition = await _box.get('position', defaultValue: Duration.zero);
    queueSource =
        await _box.get('queueSource', defaultValue: const QueueSource());
    _repeatMode =
        await _box.get('repeatMode', defaultValue: AudioServiceRepeatMode.none);
    //Restore queue
    if (q != null) {
      _queueAutoIncrement = q.length;
      queue.add(q);
      await _loadQueue();
      mediaItem.add(currentMediaItem);
    } else {
      await _loadQueue();
    }
    //Send restored queue source to ui
    customEvent.add({
      'action': 'onRestore',
      'queueSource': queueSource!,
      'repeatMode': _repeatMode
    });
  }

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

    queue.add(List.from(queue.value)
      ..insert(index, mediaItem..extras!['id'] = _queueAutoIncrement++));
    AudioSource? newSource = await _mediaItemToAudioSource(mediaItem);
    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(List.from(queue.value)
      ..add(mediaItem..extras!['id'] = _queueAutoIncrement++));
    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>? extras]) async {
    //Android auto load tracks
    if (mediaId.startsWith(AndroidAuto.prefix)) {
      await _androidAuto.playItem(mediaId.substring(AndroidAuto.prefix.length));
      return;
    }

    //Does the same thing
    await 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();
  }

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

    List<Track>? tracks;
    switch (queueSource!.source) {
      //Flow
      case 'flow':
        tracks = await _deezerAPI.flow(queueSource!.id);
        break;
      //SmartRadio/Artist radio
      case 'smartradio':
        tracks = await _deezerAPI.smartRadio(queueSource!.id!);
        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 = queue.value.map((e) => e.id).toList();
        tracks?.removeWhere((track) => queueIds.contains(track.id));
        break;
      case 'smarttracklist':
        tracks = (await _deezerAPI.smartTrackList(queueSource!.id!)).tracks;
      default:
        return;
      // print(queueSource.toJson());
    }

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

    final mi = await Future.wait(
        tracks.map<Future<MediaItem>>((t) => t.toMediaItem()));
    await addQueueItems(mi);
  }

  Future<void> _authorizeLastFM(String username, String password) async {
    _scrobblenaut = Scrobblenaut(
        lastFM: await LastFM.authenticateWithPasswordHash(
            apiKey: 'b6ab5ae967bcd8b10b23f68f42493829',
            apiSecret: '861b0dff9a8a574bec747f9dab8b82bf',
            username: username,
            passwordHash: password));
  }
}

//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;
  }
}