/*! @name videojs-playlist @version 4.2.6 @license Apache-2.0 */
import videojs from 'video.js';

/**
 * Validates a number of seconds to use as the auto-advance delay.
 *
 * @private
 * @param   {number} s
 *          The number to check
 *
 * @return  {boolean}
 *          Whether this is a valid second or not
 */
var validSeconds = function validSeconds(s) {
  return typeof s === 'number' && !isNaN(s) && s >= 0 && s < Infinity;
};
/**
 * Resets the auto-advance behavior of a player.
 *
 * @param {Player} player
 *        The player to reset the behavior on
 */


var reset = function reset(player) {
  var aa = player.playlist.autoadvance_;

  if (aa.timeout) {
    player.clearTimeout(aa.timeout);
  }

  if (aa.trigger) {
    player.off('ended', aa.trigger);
  }

  aa.timeout = null;
  aa.trigger = null;
};
/**
 * Sets up auto-advance behavior on a player.
 *
 * @param  {Player} player
 *         the current player
 *
 * @param  {number} delay
 *         The number of seconds to wait before each auto-advance.
 *
 * @return {undefined}
 *         Used to short circuit function logic
 */


var setup = function setup(player, delay) {
  reset(player); // Before queuing up new auto-advance behavior, check if `seconds` was
  // called with a valid value.

  if (!validSeconds(delay)) {
    player.playlist.autoadvance_.delay = null;
    return;
  }

  player.playlist.autoadvance_.delay = delay;

  player.playlist.autoadvance_.trigger = function () {
    // This calls setup again, which will reset the existing auto-advance and
    // set up another auto-advance for the next "ended" event.
    var cancelOnPlay = function cancelOnPlay() {
      return setup(player, delay);
    }; // If there is a "play" event while we're waiting for an auto-advance,
    // we need to cancel the auto-advance. This could mean the user seeked
    // back into the content or restarted the content. This is reproducible
    // with an auto-advance > 0.


    player.one('play', cancelOnPlay);
    player.playlist.autoadvance_.timeout = player.setTimeout(function () {
      reset(player);
      player.off('play', cancelOnPlay);
      player.playlist.next();
    }, delay * 1000);
  };

  player.one('ended', player.playlist.autoadvance_.trigger);
};

/**
 * Removes all remote text tracks from a player.
 *
 * @param  {Player} player
 *         The player to clear tracks on
 */

var clearTracks = function clearTracks(player) {
  var tracks = player.remoteTextTracks();
  var i = tracks && tracks.length || 0; // This uses a `while` loop rather than `forEach` because the
  // `TextTrackList` object is a live DOM list (not an array).

  while (i--) {
    player.removeRemoteTextTrack(tracks[i]);
  }
};
/**
 * Plays an item on a player's playlist.
 *
 * @param  {Player} player
 *         The player to play the item on
 *
 * @param  {Object} item
 *         A source from the playlist.
 *
 * @return {Player}
 *         The player that is now playing the item
 */


var playItem = function playItem(player, item) {
  var replay = !player.paused() || player.ended();
  player.trigger('beforeplaylistitem', item);
  player.poster(item.poster || '');
  player.src(item.sources);
  clearTracks(player);
  player.ready(function () {
    (item.textTracks || []).forEach(player.addRemoteTextTrack.bind(player));
    player.trigger('playlistitem', item);

    if (replay) {
      var playPromise = player.play(); // silence error when a pause interrupts a play request
      // on browsers which return a promise

      if (typeof playPromise !== 'undefined' && typeof playPromise.then === 'function') {
        playPromise.then(null, function (e) {});
      }
    }

    setup(player, player.playlist.autoadvance_.delay);
  });
  return player;
};

/**
 * Given two sources, check to see whether the two sources are equal.
 * If both source urls have a protocol, the protocols must match, otherwise, protocols
 * are ignored.
 *
 * @private
 * @param {string|Object} source1
 *        The first source
 *
 * @param {string|Object} source2
 *        The second source
 *
 * @return {boolean}
 *         The result
 */

var sourceEquals = function sourceEquals(source1, source2) {
  var src1 = source1;
  var src2 = source2;

  if (typeof source1 === 'object') {
    src1 = source1.src;
  }

  if (typeof source2 === 'object') {
    src2 = source2.src;
  }

  if (/^\/\//.test(src1)) {
    src2 = src2.slice(src2.indexOf('//'));
  }

  if (/^\/\//.test(src2)) {
    src1 = src1.slice(src1.indexOf('//'));
  }

  return src1 === src2;
};
/**
 * Look through an array of playlist items for a specific `source`;
 * checking both the value of elements and the value of their `src`
 * property.
 *
 * @private
 * @param   {Array} arr
 *          An array of playlist items to look through
 *
 * @param   {string} src
 *          The source to look for
 *
 * @return  {number}
 *          The index of that source or -1
 */


var indexInSources = function indexInSources(arr, src) {
  for (var i = 0; i < arr.length; i++) {
    var sources = arr[i].sources;

    if (Array.isArray(sources)) {
      for (var j = 0; j < sources.length; j++) {
        var source = sources[j];

        if (source && sourceEquals(source, src)) {
          return i;
        }
      }
    }
  }

  return -1;
};
/**
 * Randomize the contents of an array.
 *
 * @private
 * @param  {Array} arr
 *         An array.
 *
 * @return {Array}
 *         The same array that was passed in.
 */


var randomize = function randomize(arr) {
  var index = -1;
  var lastIndex = arr.length - 1;

  while (++index < arr.length) {
    var rand = index + Math.floor(Math.random() * (lastIndex - index + 1));
    var value = arr[rand];
    arr[rand] = arr[index];
    arr[index] = value;
  }

  return arr;
};
/**
 * Factory function for creating new playlist implementation on the given player.
 *
 * API summary:
 *
 * playlist(['a', 'b', 'c']) // setter
 * playlist() // getter
 * playlist.currentItem() // getter, 0
 * playlist.currentItem(1) // setter, 1
 * playlist.next() // 'c'
 * playlist.previous() // 'b'
 * playlist.first() // 'a'
 * playlist.last() // 'c'
 * playlist.autoadvance(5) // 5 second delay
 * playlist.autoadvance() // cancel autoadvance
 *
 * @param  {Player} player
 *         The current player
 *
 * @param  {Array=} initialList
 *         If given, an initial list of sources with which to populate
 *         the playlist.
 *
 * @param  {number=}  initialIndex
 *         If given, the index of the item in the list that should
 *         be loaded first. If -1, no video is loaded. If omitted, The
 *         the first video is loaded.
 *
 * @return {Function}
 *         Returns the playlist function specific to the given player.
 */


function factory(player, initialList, initialIndex) {
  if (initialIndex === void 0) {
    initialIndex = 0;
  }

  var list = null;
  var changing = false;
  /**
   * Get/set the playlist for a player.
   *
   * This function is added as an own property of the player and has its
   * own methods which can be called to manipulate the internal state.
   *
   * @param  {Array} [newList]
   *         If given, a new list of sources with which to populate the
   *         playlist. Without this, the function acts as a getter.
   *
   * @param  {number}  [newIndex]
   *         If given, the index of the item in the list that should
   *         be loaded first. If -1, no video is loaded. If omitted, The
   *         the first video is loaded.
   *
   * @return {Array}
   *         The playlist
   */

  var playlist = player.playlist = function (newList, newIndex) {
    if (newIndex === void 0) {
      newIndex = 0;
    }

    if (changing) {
      throw new Error('do not call playlist() during a playlist change');
    }

    if (Array.isArray(newList)) {
      // @todo - Simplify this to `list.slice()` for v5.
      var previousPlaylist = Array.isArray(list) ? list.slice() : null;
      list = newList.slice(); // Mark the playlist as changing during the duringplaylistchange lifecycle.

      changing = true;
      player.trigger({
        type: 'duringplaylistchange',
        nextIndex: newIndex,
        nextPlaylist: list,
        previousIndex: playlist.currentIndex_,
        // @todo - Simplify this to simply pass along `previousPlaylist` for v5.
        previousPlaylist: previousPlaylist || []
      });
      changing = false;

      if (newIndex !== -1) {
        playlist.currentItem(newIndex);
      } // The only time the previous playlist is null is the first call to this
      // function. This allows us to fire the `duringplaylistchange` event
      // every time the playlist is populated and to maintain backward
      // compatibility by not firing the `playlistchange` event on the initial
      // population of the list.
      //
      // @todo - Remove this condition in preparation for v5.


      if (previousPlaylist) {
        player.setTimeout(function () {
          player.trigger('playlistchange');
        }, 0);
      }
    } // Always return a shallow clone of the playlist list.


    return list.slice();
  }; // On a new source, if there is no current item, disable auto-advance.


  player.on('loadstart', function () {
    if (playlist.currentItem() === -1) {
      reset(player);
    }
  });
  playlist.currentIndex_ = -1;
  playlist.player_ = player;
  playlist.autoadvance_ = {};
  playlist.repeat_ = false;
  /**
   * Get or set the current item in the playlist.
   *
   * During the duringplaylistchange event, acts only as a getter.
   *
   * @param  {number} [index]
   *         If given as a valid value, plays the playlist item at that index.
   *
   * @return {number}
   *         The current item index.
   */

  playlist.currentItem = function (index) {
    // If the playlist is changing, only act as a getter.
    if (changing) {
      return playlist.currentIndex_;
    }

    if (typeof index === 'number' && playlist.currentIndex_ !== index && index >= 0 && index < list.length) {
      playlist.currentIndex_ = index;
      playItem(playlist.player_, list[playlist.currentIndex_]);
    } else {
      playlist.currentIndex_ = playlist.indexOf(playlist.player_.currentSrc() || '');
    }

    return playlist.currentIndex_;
  };
  /**
   * Checks if the playlist contains a value.
   *
   * @param  {string|Object|Array} value
   *         The value to check
   *
   * @return {boolean}
   *         The result
   */


  playlist.contains = function (value) {
    return playlist.indexOf(value) !== -1;
  };
  /**
   * Gets the index of a value in the playlist or -1 if not found.
   *
   * @param  {string|Object|Array} value
   *         The value to find the index of
   *
   * @return {number}
   *         The index or -1
   */


  playlist.indexOf = function (value) {
    if (typeof value === 'string') {
      return indexInSources(list, value);
    }

    var sources = Array.isArray(value) ? value : value.sources;

    for (var i = 0; i < sources.length; i++) {
      var source = sources[i];

      if (typeof source === 'string') {
        return indexInSources(list, source);
      } else if (source.src) {
        return indexInSources(list, source.src);
      }
    }

    return -1;
  };
  /**
   * Get the index of the current item in the playlist. This is identical to
   * calling `currentItem()` with no arguments.
   *
   * @return {number}
   *         The current item index.
   */


  playlist.currentIndex = function () {
    return playlist.currentItem();
  };
  /**
   * Get the index of the last item in the playlist.
   *
   * @return {number}
   *         The index of the last item in the playlist or -1 if there are no
   *         items.
   */


  playlist.lastIndex = function () {
    return list.length - 1;
  };
  /**
   * Get the index of the next item in the playlist.
   *
   * @return {number}
   *         The index of the next item in the playlist or -1 if there is no
   *         current item.
   */


  playlist.nextIndex = function () {
    var current = playlist.currentItem();

    if (current === -1) {
      return -1;
    }

    var lastIndex = playlist.lastIndex(); // When repeating, loop back to the beginning on the last item.

    if (playlist.repeat_ && current === lastIndex) {
      return 0;
    } // Don't go past the end of the playlist.


    return Math.min(current + 1, lastIndex);
  };
  /**
   * Get the index of the previous item in the playlist.
   *
   * @return {number}
   *         The index of the previous item in the playlist or -1 if there is
   *         no current item.
   */


  playlist.previousIndex = function () {
    var current = playlist.currentItem();

    if (current === -1) {
      return -1;
    } // When repeating, loop back to the end of the playlist.


    if (playlist.repeat_ && current === 0) {
      return playlist.lastIndex();
    } // Don't go past the beginning of the playlist.


    return Math.max(current - 1, 0);
  };
  /**
   * Plays the first item in the playlist.
   *
   * @return {Object|undefined}
   *         Returns undefined and has no side effects if the list is empty.
   */


  playlist.first = function () {
    if (changing) {
      return;
    }

    if (list.length) {
      return list[playlist.currentItem(0)];
    }

    playlist.currentIndex_ = -1;
  };
  /**
   * Plays the last item in the playlist.
   *
   * @return {Object|undefined}
   *         Returns undefined and has no side effects if the list is empty.
   */


  playlist.last = function () {
    if (changing) {
      return;
    }

    if (list.length) {
      return list[playlist.currentItem(playlist.lastIndex())];
    }

    playlist.currentIndex_ = -1;
  };
  /**
   * Plays the next item in the playlist.
   *
   * @return {Object|undefined}
   *         Returns undefined and has no side effects if on last item.
   */


  playlist.next = function () {
    if (changing) {
      return;
    }

    var index = playlist.nextIndex();

    if (index !== playlist.currentIndex_) {
      return list[playlist.currentItem(index)];
    }
  };
  /**
   * Plays the previous item in the playlist.
   *
   * @return {Object|undefined}
   *         Returns undefined and has no side effects if on first item.
   */


  playlist.previous = function () {
    if (changing) {
      return;
    }

    var index = playlist.previousIndex();

    if (index !== playlist.currentIndex_) {
      return list[playlist.currentItem(index)];
    }
  };
  /**
   * Set up auto-advance on the playlist.
   *
   * @param  {number} [delay]
   *         The number of seconds to wait before each auto-advance.
   */


  playlist.autoadvance = function (delay) {
    setup(playlist.player_, delay);
  };
  /**
   * Sets `repeat` option, which makes the "next" video of the last video in
   * the playlist be the first video in the playlist.
   *
   * @param  {boolean} [val]
   *         The value to set repeat to
   *
   * @return {boolean}
   *         The current value of repeat
   */


  playlist.repeat = function (val) {
    if (val === undefined) {
      return playlist.repeat_;
    }

    if (typeof val !== 'boolean') {
      videojs.log.error('videojs-playlist: Invalid value for repeat', val);
      return;
    }

    playlist.repeat_ = !!val;
    return playlist.repeat_;
  };
  /**
   * Sorts the playlist array.
   *
   * @see {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort}
   * @fires playlistsorted
   *
   * @param {Function} compare
   *        A comparator function as per the native Array method.
   */


  playlist.sort = function (compare) {
    // Bail if the array is empty.
    if (!list.length) {
      return;
    }

    list.sort(compare); // If the playlist is changing, don't trigger events.

    if (changing) {
      return;
    }
    /**
     * Triggered after the playlist is sorted internally.
     *
     * @event playlistsorted
     * @type {Object}
     */


    player.trigger('playlistsorted');
  };
  /**
   * Reverses the playlist array.
   *
   * @see {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reverse}
   * @fires playlistsorted
   */


  playlist.reverse = function () {
    // Bail if the array is empty.
    if (!list.length) {
      return;
    }

    list.reverse(); // If the playlist is changing, don't trigger events.

    if (changing) {
      return;
    }
    /**
     * Triggered after the playlist is sorted internally.
     *
     * @event playlistsorted
     * @type {Object}
     */


    player.trigger('playlistsorted');
  };
  /**
   * Shuffle the contents of the list randomly.
   *
   * @see   {@link https://github.com/lodash/lodash/blob/40e096b6d5291a025e365a0f4c010d9a0efb9a69/shuffle.js}
   * @fires playlistsorted
   * @todo  Make the `rest` option default to `true` in v5.0.0.
   * @param {Object} [options]
   *        An object containing shuffle options.
   *
   * @param {boolean} [options.rest = false]
   *        By default, the entire playlist is randomized. However, this may
   *        not be desirable in all cases, such as when a user is already
   *        watching a video.
   *
   *        When `true` is passed for this option, it will only shuffle
   *        playlist items after the current item. For example, when on the
   *        first item, will shuffle the second item and beyond.
   */


  playlist.shuffle = function (_temp) {
    var _ref = _temp === void 0 ? {} : _temp,
        rest = _ref.rest;

    var index = 0;
    var arr = list; // When options.rest is true, start randomization at the item after the
    // current item.

    if (rest) {
      index = playlist.currentIndex_ + 1;
      arr = list.slice(index);
    } // Bail if the array is empty or too short to shuffle.


    if (arr.length <= 1) {
      return;
    }

    randomize(arr); // When options.rest is true, splice the randomized sub-array back into
    // the original array.

    if (rest) {
      var _list;

      (_list = list).splice.apply(_list, [index, arr.length].concat(arr));
    } // If the playlist is changing, don't trigger events.


    if (changing) {
      return;
    }
    /**
     * Triggered after the playlist is sorted internally.
     *
     * @event playlistsorted
     * @type {Object}
     */


    player.trigger('playlistsorted');
  }; // If an initial list was given, populate the playlist with it.


  if (Array.isArray(initialList)) {
    playlist(initialList.slice(), initialIndex); // If there is no initial list given, silently set an empty array.
  } else {
    list = [];
  }

  return playlist;
}

var version = "4.2.6";

var registerPlugin = videojs.registerPlugin || videojs.plugin;
/**
 * The video.js playlist plugin. Invokes the playlist-maker to create a
 * playlist function on the specific player.
 *
 * @param {Array} list
 *        a list of sources
 *
 * @param {number} item
 *        The index to start at
 */

var plugin = function plugin(list, item) {
  factory(this, list, item);
};

registerPlugin('playlist', plugin);
plugin.VERSION = version;

export default plugin;