# All files / src/controller audio-track-controller.js

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     import Event from '../events';
    import TaskLoop from '../task-loop';
    import { logger } from '../utils/logger';
    import { ErrorTypes, ErrorDetails } from '../errors';

    /**
     * @class AudioTrackController
     * @implements {EventHandler}
     *
     * Handles main manifest and audio-track metadata loaded,
     * owns and exposes the selectable audio-tracks data-models.
     *
     * Exposes internal interface to select available audio-tracks.
     *
     * Handles errors on loading audio-track playlists. Manages fallback mechanism
     * with redundants tracks (group-IDs).
     *
     * Handles level-loading and group-ID switches for video (fallback on video levels),
     * and eventually adapts the audio-track group-ID to match.
     *
     * @fires AUDIO_TRACK_LOADING
     * @fires AUDIO_TRACK_SWITCHING
     * @fires AUDIO_TRACKS_UPDATED
     * @fires ERROR
     *
     */
    class AudioTrackController extends TaskLoop {
      constructor (hls) {
        super(hls,
          Event.MANIFEST_LOADING,
          Event.MANIFEST_PARSED,
          Event.AUDIO_TRACK_LOADED,
          Event.AUDIO_TRACK_SWITCHED,
          Event.LEVEL_LOADED,
          Event.ERROR
        );

        /**
         * @private
         * Currently selected index in `tracks`
         * @member {number} trackId
         */
        this._trackId = -1;

        /**
         * @private
         * If should select tracks according to default track attribute
         * @member {boolean} _selectDefaultTrack
         */
        this._selectDefaultTrack = true;

        /**
         * @public
         * All tracks available
         * @member {AudioTrack[]}
         */
        this.tracks = [];

        /**
         * @public
         * List of blacklisted audio track IDs (that have caused failure)
         * @member {number[]}
         */
        this.trackIdBlacklist = Object.create(null);

        /**
         * @public
         * The currently running group ID for audio
         * (we grab this on manifest-parsed and new level-loaded)
         * @member {string}
         */
        this.audioGroupId = null;
      }

      /**
       * Reset audio tracks on new manifest loading.
       */
      onManifestLoading () {
        this.tracks = [];
        this._trackId = -1;
        this._selectDefaultTrack = true;
      }

      /**
       * Store tracks data from manifest parsed data.
       *
       * Trigger AUDIO_TRACKS_UPDATED event.
       *
       * @param {*} data
       */
      onManifestParsed (data) {
        const tracks = this.tracks = data.audioTracks || [];
        this.hls.trigger(Event.AUDIO_TRACKS_UPDATED, { audioTracks: tracks });
      }

      /**
       * Store track details of loaded track in our data-model.
       *
       * Set-up metadata update interval task for live-mode streams.
       *
       * @param {} data
       */
      onAudioTrackLoaded (data) {
        Iif (data.id >= this.tracks.length) {
          logger.warn('Invalid audio track id:', data.id);
          return;
        }

        logger.log(`audioTrack ${data.id} loaded`);

        this.tracks[data.id].details = data.details;

        // check if current playlist is a live playlist
        // and if we have already our reload interval setup
        if (data.details.live && !this.hasInterval()) {
          // if live playlist we will have to reload it periodically
          // set reload period to playlist target duration
          const updatePeriodMs = data.details.targetduration * 1000;
          this.setInterval(updatePeriodMs);
        }

        Iif (!data.details.live && this.hasInterval()) {
          // playlist is not live and timer is scheduled: cancel it
          this.clearInterval();
        }
      }

      /**
       * Update the internal group ID to any audio-track we may have set manually
       * or because of a failure-handling fallback.
       *
       * Quality-levels should update to that group ID in this case.
       *
       * @param {*} data
       */
      onAudioTrackSwitched (data) {
        const audioGroupId = this.tracks[data.id].groupId;
        if (audioGroupId && (this.audioGroupId !== audioGroupId)) {
          this.audioGroupId = audioGroupId;
        }
      }

      /**
       * When a level gets loaded, if it has redundant audioGroupIds (in the same ordinality as it's redundant URLs)
       * we are setting our audio-group ID internally to the one set, if it is different from the group ID currently set.
       *
       * If group-ID got update, we re-select the appropriate audio-track with this group-ID matching the currently
       * selected one (based on NAME property).
       *
       * @param {*} data
       */
      onLevelLoaded (data) {
        // FIXME: crashes because currentLevel is undefined
        // const levelInfo = this.hls.levels[this.hls.currentLevel];

        const levelInfo = this.hls.levels[data.level];

        Iif (!levelInfo.audioGroupIds) {
          return;
        }

        const audioGroupId = levelInfo.audioGroupIds[levelInfo.urlId];
        Eif (this.audioGroupId !== audioGroupId) {
          this.audioGroupId = audioGroupId;
          this._selectInitialAudioTrack();
        }
      }

      /**
       * Handle network errors loading audio track manifests
       * and also pausing on any netwok errors.
       *
       * @param {ErrorEventData} data
       */
      onError (data) {
        // Only handle network errors
        if (data.type !== ErrorTypes.NETWORK_ERROR) {
          return;
        }

        // If fatal network error, cancel update task
        if (data.fatal) {
          this.clearInterval();
        }

        // If not an audio-track loading error don't handle further
        if (data.details !== ErrorDetails.AUDIO_TRACK_LOAD_ERROR) {
          return;
        }

        logger.warn('Network failure on audio-track id:', data.context.id);
        this._handleLoadError();
      }

      /**
       * @type {AudioTrack[]} Audio-track list we own
       */
      get audioTracks () {
        return this.tracks;
      }

      /**
       * @type {number} Index into audio-tracks list of currently selected track.
       */
      get audioTrack () {
        return this._trackId;
      }

      /**
       * Select current track by index
       */
      set audioTrack (newId) {
        this._setAudioTrack(newId);
        // If audio track is selected from API then don't choose from the manifest default track
        this._selectDefaultTrack = false;
      }

      /**
       * @private
       * @param {number} newId
       */
      _setAudioTrack (newId) {
        // noop on same audio track id as already set
        Iif (this._trackId === newId && this.tracks[this._trackId].details) {
          logger.debug('Same id as current audio-track passed, and track details available -> no-op');
          return;
        }

        // check if level idx is valid
        Iif (newId < 0 || newId >= this.tracks.length) {
          logger.warn('Invalid id passed to audio-track controller');
          return;
        }

        const audioTrack = this.tracks[newId];

        logger.log(`Now switching to audio-track index ${newId}`);

        // stopping live reloading timer if any
        this.clearInterval();
        this._trackId = newId;

        const { url, type, id } = audioTrack;
        this.hls.trigger(Event.AUDIO_TRACK_SWITCHING, { id, type, url });
        this._loadTrackDetailsIfNeeded(audioTrack);
      }

      /**
       * @override
       */
      doTick () {
        this._updateTrack(this._trackId);
      }

      /**
       * Select initial track
       * @private
       */
      _selectInitialAudioTrack () {
        let tracks = this.tracks;
        Iif (!tracks.length) {
          return;
        }

        const currentAudioTrack = this.tracks[this._trackId];

        let name = null;
        if (currentAudioTrack) {
          name = currentAudioTrack.name;
        }

        // Pre-select default tracks if there are any
        if (this._selectDefaultTrack) {
          const defaultTracks = tracks.filter((track) => track.default);
          Eif (defaultTracks.length) {
            tracks = defaultTracks;
          } else {
            logger.warn('No default audio tracks defined');
          }
        }

        let trackFound = false;

        const traverseTracks = () => {
          // Select track with right group ID
          tracks.forEach((track) => {
            if (trackFound) {
              return;
            }
            // We need to match the (pre-)selected group ID
            // and the NAME of the current track.
            if ((!this.audioGroupId || track.groupId === this.audioGroupId) &&
              (!name || name === track.name)) {
              // If there was a previous track try to stay with the same `NAME`.
              // It should be unique across tracks of same group, and consistent through redundant track groups.
              this._setAudioTrack(track.id);
              trackFound = true;
            }
          });
        };

        traverseTracks();

        if (!trackFound) {
          name = null;
          traverseTracks();
        }

        Iif (!trackFound) {
          logger.error(`No track found for running audio group-ID: ${this.audioGroupId}`);

          this.hls.trigger(Event.ERROR, {
            type: ErrorTypes.MEDIA_ERROR,
            details: ErrorDetails.AUDIO_TRACK_LOAD_ERROR,
            fatal: true
          });
        }
      }

      /**
       * @private
       * @param {AudioTrack} audioTrack
       * @returns {boolean}
       */
      _needsTrackLoading (audioTrack) {
        const { details, url } = audioTrack;

        Eif (!details || details.live) {
          // check if we face an audio track embedded in main playlist (audio track without URI attribute)
          return !!url;
        }

        return false;
      }

      /**
       * @private
       * @param {AudioTrack} audioTrack
       */
      _loadTrackDetailsIfNeeded (audioTrack) {
        if (this._needsTrackLoading(audioTrack)) {
          const { url, id } = audioTrack;
          // track not retrieved yet, or live playlist we need to (re)load it
          logger.log(`loading audio-track playlist for id: ${id}`);
          this.hls.trigger(Event.AUDIO_TRACK_LOADING, { url, id });
        }
      }

      /**
       * @private
       * @param {number} newId
       */
      _updateTrack (newId) {
        // check if level idx is valid
        if (newId < 0 || newId >= this.tracks.length) {
          return;
        }

        // stopping live reloading timer if any
        this.clearInterval();
        this._trackId = newId;
        logger.log(`trying to update audio-track ${newId}`);
        const audioTrack = this.tracks[newId];
        this._loadTrackDetailsIfNeeded(audioTrack);
      }

      /**
       * @private
       */
      _handleLoadError () {
        // First, let's black list current track id
        this.trackIdBlacklist[this._trackId] = true;

        // Let's try to fall back on a functional audio-track with the same group ID
        const previousId = this._trackId;
        const { name, language, groupId } = this.tracks[previousId];

        logger.warn(`Loading failed on audio track id: ${previousId}, group-id: ${groupId}, name/language: "${name}" / "${language}"`);

        // Find a non-blacklisted track ID with the same NAME
        // At least a track that is not blacklisted, thus on another group-ID.
        let newId = previousId;
        for (let i = 0; i < this.tracks.length; i++) {
          Iif (this.trackIdBlacklist[i]) {
            continue;
          }
          const newTrack = this.tracks[i];
          if (newTrack.name === name) {
            newId = i;
            break;
          }
        }

        Iif (newId === previousId) {
          logger.warn(`No fallback audio-track found for name/language: "${name}" / "${language}"`);
          return;
        }

        logger.log('Attempting audio-track fallback id:', newId, 'group-id:', this.tracks[newId].groupId);

        this._setAudioTrack(newId);
      }
    }

    export default AudioTrackController;