var audioControllerFactory = (function () {
  function AudioController(audioFactory) {
    this.audios = [];
    this.audioFactory = audioFactory;
    this._volume = 1;
    this._isMuted = false;
  }

  AudioController.prototype = {
    addAudio: function (audio) {
      this.audios.push(audio);
    },
    pause: function () {
      var i,
        len = this.audios.length;
      for (i = 0; i < len; i += 1) {
        this.audios[i].pause();
      }
    },
    resume: function () {
      var i,
        len = this.audios.length;
      for (i = 0; i < len; i += 1) {
        this.audios[i].resume();
      }
    },
    setRate: function (rateValue) {
      var i,
        len = this.audios.length;
      for (i = 0; i < len; i += 1) {
        this.audios[i].setRate(rateValue);
      }
    },
    createAudio: function (assetPath) {
      if (this.audioFactory) {
        return this.audioFactory(assetPath);
      } if (Howl) {
        return new Howl({
          src: [assetPath],
        });
      }
      return {
        isPlaying: false,
        play: function () { this.isPlaying = true; },
        seek: function () { this.isPlaying = false; },
        playing: function () {},
        rate: function () {},
        setVolume: function () {},
      };
    },
    setAudioFactory: function (audioFactory) {
      this.audioFactory = audioFactory;
    },
    setVolume: function (value) {
      this._volume = value;
      this._updateVolume();
    },
    mute: function () {
      this._isMuted = true;
      this._updateVolume();
    },
    unmute: function () {
      this._isMuted = false;
      this._updateVolume();
    },
    getVolume: function (value) {
      return this._volume;
    },
    _updateVolume: function () {
      var i,
        len = this.audios.length;
      for (i = 0; i < len; i += 1) {
        this.audios[i].volume(this._volume * (this._isMuted ? 0 : 1));
      }
    },
  };

  return function () {
    return new AudioController();
  };
}());