/*! videojs-resolution-switcher - v0.0.0 - 2015-7-26
 * Copyright (c) 2015 Kasper Moskwiak
 * Modified by Pierre Kraft
 * Licensed under the Apache-2.0 license. */

(function() {
  /* jshint eqnull: true*/
  /* global require */
  'use strict';
  var videojs = null;
  if(typeof window.videojs === 'undefined' && typeof require === 'function') {
    videojs = require('videojs');
  } else {
    videojs = window.videojs;
  }

  (function(window, videojs) {
    
  
    var defaults = {},
        videoJsResolutionSwitcher;
  
    function setSourcesSanitized(player, sources) {
      return player.src(sources.map(function(src) {
        return {src: src.src, type: src.type, res: src.res};
      }));
    }
  
  /*
   * Resolution menu item
   */
  var MenuItem = videojs.getComponent('MenuItem');
  var ResolutionMenuItem = videojs.extend(MenuItem, {
    constructor: function(player, options, onClickListener, label){
      this.onClickListener = onClickListener;
      this.label = label;
      // Sets this.player_, this.options_ and initializes the component
      MenuItem.call(this, player, options);
      this.src = options.src;

      this.on('click', this.onClick);
      this.on('touchstart', this.onClick);

      if (options.initialySelected) {
        this.showAsLabel();
        this.selected(true);
      }
    },
    showAsLabel: function() {
      // Change menu button label to the label of this item if the menu button label is provided
      if(this.label) {
        this.label.innerHTML = this.options_.label;
      }
    },
    onClick: function(){
      this.onClickListener(this);
      // Remember player state
      var currentTime = this.player_.currentTime();
      var isPaused = this.player_.paused();
      this.showAsLabel();
      // Hide bigPlayButton
      if(!isPaused){
        this.player_.bigPlayButton.hide();
      }
      // Change player source and wait for loadeddata event, then play video
      // loadedmetadata doesn't work right now for flash.
      // Probably because of https://github.com/videojs/video-js-swf/issues/124
      setSourcesSanitized(this.player_, this.src).one('loadeddata', function() {
        this.player_.currentTime(currentTime);
        this.player_.handleTechSeeked_();
        if(!isPaused){
          // Start playing and hide loadingSpinner (flash issue ?)
          this.player_.play().handleTechSeeked_();
        }
        this.player_.trigger('resolutionchange');
        });
      }
    });
  
  
    /*
     * Resolution menu button
     */
     var MenuButton = videojs.getComponent('MenuButton');
     var ResolutionMenuButton = videojs.extend(MenuButton, {
       constructor: function(player, options, settings, label){
        this.sources = options.sources;
        this.label = label;
        this.label.innerHTML = options.initialySelectedLabel;
        // Sets this.player_, this.options_ and initializes the component
        MenuButton.call(this, player, options);
        this.controlText('Quality');
  
        if(settings.dynamicLabel){
          this.el().appendChild(label);
        }else{
          var staticLabel = document.createElement('span');
          staticLabel.classList.add('vjs-resolution-button-staticlabel');
          this.el().appendChild(staticLabel);
        }
       },
       createItems: function(){
         var menuItems = [];
         var labels = (this.sources && this.sources.label) || {};
         var onClickUnselectOthers = function(clickedItem) {
          menuItems.map(function(item) {
            item.selected(item === clickedItem);
          });
         };
  
         for (var key in labels) {
           if (labels.hasOwnProperty(key)) {
            menuItems.push(new ResolutionMenuItem(
              this.player_,
              {
                label: key,
                src: labels[key],
                initialySelected: key === this.options_.initialySelectedLabel
              },
              onClickUnselectOthers,
              this.label));
            }
         }
         return menuItems;
       }
     });
  
    /**
     * Initialize the plugin.
     * @param options (optional) {object} configuration for the plugin
     */
    videoJsResolutionSwitcher = function(options) {
      var settings = videojs.mergeOptions(defaults, options),
          player = this,
          label = document.createElement('span');
  
      label.classList.add('vjs-resolution-button-label');
  
      player.updateSrc = function(src){
        //Return current src if src is not given
        if(!src){ return player.src(); }
        // Dispose old resolution menu button before adding new sources
        if(player.controlBar.resolutionSwitcher){
          player.controlBar.resolutionSwitcher.dispose();
          delete player.controlBar.resolutionSwitcher;
        }
        //Sort sources
        src = src.sort(compareResolutions);
        var groupedSrc = bucketSources(src);
        var choosen = chooseSrc(groupedSrc, src);
        var menuButton = new ResolutionMenuButton(player, { sources: groupedSrc, initialySelectedLabel: choosen.label , initialySelectedRes: choosen.res}, settings, label);
        menuButton.el().classList.add('vjs-resolution-button');
        player.controlBar.resolutionSwitcher = player.controlBar.addChild(menuButton);
        return setSourcesSanitized(player, choosen.sources);
      };
  
      /**
       * Method used for sorting list of sources
       * @param   {Object} a source object with res property
       * @param   {Object} b source object with res property
       * @returns {Number} result of comparation
       */
      function compareResolutions(a, b){
        if(!a.res || !b.res){ return 0; }
        return (+b.res)-(+a.res);
      }
  
      /**
       * Group sources by label, resolution and type
       * @param   {Array}  src Array of sources
       * @returns {Object} grouped sources: { label: { key: [] }, res: { key: [] }, type: { key: [] } }
       */
      function bucketSources(src){
        var resolutions = {
          label: {},
          res: {},
          type: {}
        };
        src.map(function(source) {
          initResolutionKey(resolutions, 'label', source);
          initResolutionKey(resolutions, 'res', source);
          initResolutionKey(resolutions, 'type', source);
  
          appendSourceToKey(resolutions, 'label', source);
          appendSourceToKey(resolutions, 'res', source);
          appendSourceToKey(resolutions, 'type', source);
        });
        return resolutions;
      }
  
      function initResolutionKey(resolutions, key, source) {
        if(resolutions[key][source[key]] == null) {
          resolutions[key][source[key]] = [];
        }
      }
  
      function appendSourceToKey(resolutions, key, source) {
        resolutions[key][source[key]].push(source);
      }
  
      /**
       * Choose src if option.default is specified
       * @param   {Object} groupedSrc {res: { key: [] }}
       * @param   {Array}  src Array of sources sorted by resolution used to find high and low res
       * @returns {Object} {res: string, sources: []}
       */
      function chooseSrc(groupedSrc, src){
        var selectedRes = settings.default;
        var selectedLabel = '';
        if (selectedRes === 'high') {
          selectedRes = src[0].res;
          selectedLabel = src[0].label;
        } else if (selectedRes === 'low' || selectedRes == null) {
          // Select low-res if default is low or not set
          selectedRes = src[src.length - 1].res;
          selectedLabel = src[src.length -1].label;
        } else if (groupedSrc.res[selectedRes]) {
          selectedLabel = groupedSrc.res[selectedRes][0].label;
        }
        
        if(selectedRes === undefined){
          return {res: selectedRes, label: selectedLabel, sources: groupedSrc.label[selectedLabel]};
        }
        return {res: selectedRes, label: selectedLabel, sources: groupedSrc.res[selectedRes]};
      }
  
      // Create resolution switcher for videos form <source> tag inside <video>
      if(player.options_.sources.length > 1){
        // Wait for player ready event
        player.ready(function(){
          player.updateSrc(player.options_.sources);
        });
      }
  
    };
  
    // register the plugin
    videojs.plugin('videoJsResolutionSwitcher', videoJsResolutionSwitcher);
  })(window, videojs);
})();