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

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     /*
     * audio track controller
    */

    import Event from '../events';
    import EventHandler from '../event-handler';
    import {logger} from '../utils/logger';
    import {ErrorTypes} from '../errors';

    class AudioTrackController extends EventHandler {

      constructor(hls) {
        super(hls, Event.MANIFEST_LOADING,
                   Event.MANIFEST_LOADED,
                   Event.AUDIO_TRACK_LOADED,
                   Event.ERROR);
        this.ticks = 0;
        this.ontick = this.tick.bind(this);
      }

      destroy() {
        this.cleanTimer();
        EventHandler.prototype.destroy.call(this);
      }

      cleanTimer() {
        if (this.timer) {
          clearTimeout(this.timer);
          this.timer = null;
        }
      }

      tick() {
        this.ticks++;
        if (this.ticks === 1) {
          this.doTick();
          if (this.ticks > 1) {
            setTimeout(this.tick, 1);
          }
          this.ticks = 0;
        }
      }

      doTick() {
        this.updateTrack(this.trackId);
      }

      onError(data) {
        if(data.fatal && data.type === ErrorTypes.NETWORK_ERROR) {
          this.cleanTimer();
        }
      }

      onManifestLoading() {
        // reset audio tracks on manifest loading
        this.tracks = [];
        this.trackId = -1;
      }

      onManifestLoaded(data) {
        let tracks = data.audioTracks || [];
        let defaultFound = false;
        this.tracks = tracks;
        this.hls.trigger(Event.AUDIO_TRACKS_UPDATED, {audioTracks : tracks});
        // loop through available audio tracks and autoselect default if needed
        let id = 0;
        tracks.forEach(track => {
          if(track.default && !defaultFound) {
            this.audioTrack = id;
            defaultFound = true;
            return;
          }
          id++;
        });
        if (defaultFound === false && tracks.length) {
          logger.log('no default audio track defined, use first audio track as default');
          this.audioTrack = 0;
        }
      }

      onAudioTrackLoaded(data) {
        if (data.id < this.tracks.length) {
          logger.log(`audioTrack ${data.id} loaded`);
          this.tracks[data.id].details = data.details;
          // check if current playlist is a live playlist
          if (data.details.live && !this.timer) {
            // if live playlist we will have to reload it periodically
            // set reload period to playlist target duration
            this.timer = setInterval(this.ontick, 1000 * data.details.targetduration);
          }
          if (!data.details.live && this.timer) {
            // playlist is not live and timer is armed : stopping it
            this.cleanTimer();
          }
        }
      }

      /** get alternate audio tracks list from playlist **/
      get audioTracks() {
        return this.tracks;
      }

      /** get index of the selected audio track (index in audio track lists) **/
      get audioTrack() {
       return this.trackId;
      }

      /** select an audio track, based on its index in audio track lists**/
      set audioTrack(audioTrackId) {
        if (this.trackId !== audioTrackId || this.tracks[audioTrackId].details === undefined) {
          this.setAudioTrackInternal(audioTrackId);
        }
      }

     setAudioTrackInternal(newId) {
        // check if level idx is valid
        if (newId >= 0 && newId < this.tracks.length) {
          // stopping live reloading timer if any
          this.cleanTimer();
          this.trackId = newId;
          logger.log(`switching to audioTrack ${newId}`);
          let audioTrack = this.tracks[newId],
              hls = this.hls,
              type = audioTrack.type,
              url = audioTrack.url,
              eventObj = {id: newId, type : type, url : url};
          // keep AUDIO_TRACK_SWITCH for legacy reason
          hls.trigger(Event.AUDIO_TRACK_SWITCH, eventObj);
          hls.trigger(Event.AUDIO_TRACK_SWITCHING, eventObj);
           // check if we need to load playlist for this audio Track
           let details = audioTrack.details;
          if (url && (details === undefined || details.live === true)) {
            // track not retrieved yet, or live playlist we need to (re)load it
            logger.log(`(re)loading playlist for audioTrack ${newId}`);
            hls.trigger(Event.AUDIO_TRACK_LOADING, {url: url, id: newId});
          }
        }
      }

      updateTrack(newId) {
        // check if level idx is valid
        if (newId >= 0 && newId < this.tracks.length) {
          // stopping live reloading timer if any
          this.cleanTimer();
          this.trackId = newId;
          logger.log(`updating audioTrack ${newId}`);
          let audioTrack = this.tracks[newId], url = audioTrack.url;
           // check if we need to load playlist for this audio Track
           let details = audioTrack.details;
          if (url && (details === undefined || details.live === true)) {
            // track not retrieved yet, or live playlist we need to (re)load it
            logger.log(`(re)loading playlist for audioTrack ${newId}`);
            this.hls.trigger(Event.AUDIO_TRACK_LOADING, {url: url, id: newId});
          }
        }
      }
    }

    export default AudioTrackController;