/* UI Component- Base class for all UI objects
================================================================================ */
_V_.Player = _V_.Component.extend({

  init: function(tag, addOptions, ready){

    this.tag = tag; // Store the original tag used to set options

    var el = this.el = _V_.createElement("div"), // Div to contain video and controls
        options = this.options = {},
        width = options.width = tag.width,
        height = options.height = tag.height,

        // Browsers default to 300x150 if there's no width/height or video size data.
        initWidth = width || 300,
        initHeight = height || 150;

    // Make player findable on elements
    tag.player = el.player = this;

    // Add callback to ready queue
    this.ready(ready);

    // Wrap video tag in div (el/box) container
    tag.parentNode.insertBefore(el, tag);
    el.appendChild(tag); // Breaks iPhone, fixed in HTML5 setup.

    // Give video tag properties to box
    el.id = this.id = tag.id; // ID will now reference box, not the video tag
    el.className = tag.className;
    // Update tag id/class for use as HTML5 playback tech
    tag.id += "_html5_api";
    tag.className = "vjs-tech";

    // Make player easily findable by ID
    _V_.players[el.id] = this;

    // Make box use width/height of tag, or default 300x150
    el.setAttribute("width", initWidth);
    el.setAttribute("height", initHeight);
    // Enforce with CSS since width/height attrs don't work on divs
    el.style.width = initWidth+"px";
    el.style.height = initHeight+"px";
    // Remove width/height attrs from tag so CSS can make it 100% width/height
    tag.removeAttribute("width");
    tag.removeAttribute("height");

    // Set Options
    _V_.merge(options, _V_.options); // Copy Global Defaults
    _V_.merge(options, this.getVideoTagSettings()); // Override with Video Tag Options
    _V_.merge(options, addOptions); // Override/extend with options from setup call

    // Store controls setting, and then remove immediately so native controls don't flash.
    tag.removeAttribute("controls");

    // Empty video tag sources and tracks so the built in player doesn't use them also.
    if (tag.hasChildNodes()) {
      for (var i=0,j=tag.childNodes;i<j.length;i++) {
        if (j[i].nodeName == "SOURCE" || j[i].nodeName == "TRACK") {
          tag.removeChild(j[i]);
        }
      }
    }

    // Holder for playback tech components
    this.techs = {};

    // Cache for video property values.
    this.values = {};

    this.addClass("vjs-paused");

    this.addEvent("ended", this.onEnded);
    this.addEvent("play", this.onPlay);
    this.addEvent("pause", this.onPause);
    this.addEvent("error", this.onError);

    // When the API is ready, loop through the components and add to the player.
    if (options.controls) {
      this.ready(function(){
        this.each(this.options.components, function(set){
          this.addComponent(set);
        });
      });
    }

    // If there are no sources when the player is initialized,
    // load the first supported playback technology.
    if (!options.sources || options.sources.length == 0) {
      for (var i=0,j=options.techOrder; i<j.length; i++) {
        var techName = j[i],
            tech = _V_[techName];

        // Check if the browser supports this technology
        if (tech.isSupported()) {
          this.loadTech(techName);
          break;
        }
      }
    } else {
      // Loop through playback technologies (HTML5, Flash) and check for support
      // Then load the best source.
      this.src(options.sources);
    }
  },

  // Cache for video property values.
  values: {},

  destroy: function(){
    // Ensure that tracking progress and time progress will stop and plater deleted
    this.stopTrackingProgress();
    this.stopTrackingCurrentTime();
    delete _V_.players[this.id]
  },

  createElement: function(type, options){

  },

  getVideoTagSettings: function(){
    var options = {
      sources: [],
      tracks: []
    };

    options.src = this.tag.src;
    options.controls = this.tag.getAttribute("controls") !== null;
    options.poster = this.tag.poster;
    options.preload = this.tag.preload;
    options.autoplay = this.tag.getAttribute("autoplay") !== null; // hasAttribute not IE <8 compatible
    options.loop = this.tag.getAttribute("loop") !== null;
    options.muted = this.tag.getAttribute("muted") !== null;

    for (var c,i=0,j=this.tag.children;i<j.length;i++) {
      c = j[i];
      if (c.nodeName == "SOURCE") {
        options.sources.push({
          src: c.src,
          type: c.type,
          media: c.media,
          title: c.title
        });
      }
      if (c.nodeName == "TRACK") {
        options.tracks.push(new _V_.Track({
          src: c.getAttribute("src"),
          kind: c.getAttribute("kind"),
          srclang: c.getAttribute("srclang"),
          label: c.getAttribute("label"),
          'default': c.getAttribute("default") !== null,
          title: c.getAttribute("title")
        }, this));

      }
    }
    return options;
  },

  /* PLayback Technology (tech)
  ================================================================================ */
  // Load/Create an instance of playback technlogy including element and API methods
  // And append playback element in player div.
  loadTech: function(techName, source){

    this.triggerEvent("loadingtech");

    // Pause and remove current playback technology
    if (this.tech) {
      this.removeTech(this.tech);

      // Turn off any manual progress or timeupdate tracking
      if (this.manualProgress) {
        this.manualProgressOff()
      }

      if (this.manualTimeUpdates) {
        this.manualTimeUpdatesOff()
      }

    // If the first time loading, HTML5 tag will exist but won't be initialized
    // So we need to remove it if we're not loading HTML5
    } else if (!this.tech && techName != "html5") {
      this.removeTechElement(this.tag);
    }

    this.techName = techName;

    // Turn off API access because we're loading a new tech that might load asynchronously
    this.isReady = false;

    var techReady = function(){
      // Set up playback technology's event triggers
      this.setupTriggers();
      this.player.triggerReady();

      // Manually track progress in cases where the browser/flash player doesn't report it.
      if (!_V_.techSupports(this.player.techName, "event", "progress")) {
        this.player.manualProgressOn();
      }

      // Manually track timeudpates in cases where the browser/flash player doesn't report it.
      if (!_V_.techSupports(this.player.techName, "event", "timeupdate")) {
        this.player.manualTimeUpdatesOn();
      }
    }

    // Initialize new tech if it hasn't been yet and load source
    // Add tech element to player div
    if (this.techs[techName] === undefined) {

      var techOptions = _V_.merge({ source: source }, this.options[techName])

      this.techs[techName] = this.tech = new _V_[techName](this, techOptions);
      this.tech.ready(techReady)
    } else {
      this.tech = this.techs[techName];
      _V_.insertFirst(this.techs[techName].el, this.el);
      this.src(source);
    }
  },

  removeTech: function(tech){
    this.removeTechElement(tech.el);
    // TODO: Remove API listeners as well
  },

  removeTechElement: function(el){
    this.el.removeChild(el);
  },

  /* Fallbacks for unsupported event types
  ================================================================================ */
  // Manually trigger progress events based on changes to the buffered amount
  // Many flash players and older HTML5 browsers don't send progress or progress-like events
  manualProgressOn: function(){
    this.manualProgress = true;

    // Trigger progress watching when a source begins loading
    this.trackProgress();

    // Watch for a native progress event call on the tech element
    // In HTML5, some older versions don't support the progress event
    // So we're assuming they don't, and turning off manual progress if they do.
    this.tech.addEvent("progress", function(){

      // Remove this listener from the element
      this.removeEvent("progress", arguments.callee);

      // Update known progress support for this playback technology
      _V_.updateTechSupport(this.player.techName, "event", "progress", true);

      // Turn off manual progress tracking
      this.player.manualProgressOff();
    });
  },

  manualProgressOff: function(){
    this.manualProgress = false;
    this.stopTrackingProgress();
  },

  trackProgress: function(){
    this.progressInterval = setInterval(_V_.proxy(this, function(){
      // Don't trigger unless buffered amount is greater than last time
      // log(this.values.bufferEnd, this.buffered().end(0), this.duration())
      /* TODO: update for multiple buffered regions */
      if (this.values.bufferEnd < this.buffered().end(0)) {
        this.triggerEvent("progress");
      } else if (this.bufferedPercent() == 1) {
        this.stopTrackingProgress();
        this.triggerEvent("progress"); // Last update
      }
    }), 500);
  },
  stopTrackingProgress: function(){ clearInterval(this.progressInterval); },

  /* Time Tracking -------------------------------------------------------------- */
  manualTimeUpdatesOn: function(){
    this.manualTimeUpdates = true;

    this.addEvent("play", this.trackCurrentTime);
    this.addEvent("pause", this.stopTrackingCurrentTime);
    // timeupdate is also called by .currentTime whenever current time is set

    // Watch for native timeupdate event
    this.tech.addEvent("timeupdate", function(){

      // Remove this listener from the element
      this.removeEvent("timeupdate", arguments.callee);

      // Update known progress support for this playback technology
      _V_.updateTechSupport(this.player.techName, "event", "timeupdate", true);

      // Turn off manual progress tracking
      this.player.manualTimeUpdatesOff();
    });
  },

  manualTimeUpdatesOff: function(){
    this.manualTimeUpdates = false;
    this.stopTrackingCurrentTime();
    this.removeEvent("play", this.trackCurrentTime);
    this.removeEvent("pause", this.stopTrackingCurrentTime);
  },

  trackCurrentTime: function(){
    if (this.currentTimeInterval) { this.stopTrackingCurrentTime(); }
    this.currentTimeInterval = setInterval(_V_.proxy(this, function(){
      this.triggerEvent("timeupdate");
    }), 250); // 42 = 24 fps // 250 is what Webkit uses // FF uses 15
  },

  // Turn off play progress tracking (when paused or dragging)
  stopTrackingCurrentTime: function(){ clearInterval(this.currentTimeInterval); },

  /* Player event handlers (how the player reacts to certain events)
  ================================================================================ */
  onEnded: function(){
    if (this.options.loop) {
      this.currentTime(0);
      this.play();
    } else {
      this.pause();
      this.currentTime(0);
      this.pause();
    }
  },

  onPlay: function(){
    _V_.removeClass(this.el, "vjs-paused");
    _V_.addClass(this.el, "vjs-playing");
  },

  onPause: function(){
    _V_.removeClass(this.el, "vjs-playing");
    _V_.addClass(this.el, "vjs-paused");
  },

  onError: function(e) {
    _V_.log("Video Error", e);
  }

});

/* Player API
================================================================================ */
_V_.Player.prototype.extend({

  apiCall: function(method, arg){
    if (this.isReady) {
      return this.tech[method](arg);
    } else {
      _V_.log("The playback technology API is not ready yet. Use player.ready(myFunction)."+" ["+method+"]")
      return false;
      // throw new Error("The playback technology API is not ready yet. Use player.ready(myFunction)."+" ["+method+"]");
    }
  },

  play: function(){
    this.apiCall("play"); return this;
  },
  pause: function(){
    this.apiCall("pause"); return this;
  },
  paused: function(){
    return this.apiCall("paused");
  },

  currentTime: function(seconds){
    if (seconds !== undefined) {

      // Cache the last set value for smoother scrubbing.
      this.values.currentTime = seconds;

      this.apiCall("setCurrentTime", seconds);

      if (this.manualTimeUpdates) {
        this.triggerEvent("timeupdate");
      }
      return this;
    }
    return this.apiCall("currentTime");
  },
  duration: function(){
    return this.apiCall("duration");
  },
  remainingTime: function(){
    return this.duration() - this.currentTime();
  },

  buffered: function(){
    var buffered = this.apiCall("buffered"),
        start = 0, end = this.values.bufferEnd = this.values.bufferEnd || 0,
        timeRange;

    if (buffered && buffered.length > 0 && buffered.end(0) > end) {
      end = buffered.end(0);
      // Storing values allows them be overridden by setBufferedFromProgress
      this.values.bufferEnd = end;
    }

    return _V_.createTimeRange(start, end);
  },

  // Calculates amount of buffer is full
  bufferedPercent: function(){
    return (this.duration()) ? this.buffered().end(0) / this.duration() : 0;
  },

  volume: function(percentAsDecimal){
    if (percentAsDecimal !== undefined) {
      var vol = Math.max(0, Math.min(1, parseFloat(percentAsDecimal))); // Force value to between 0 and 1
      this.values.volume = vol;
      this.apiCall("setVolume", vol);
      _V_.setLocalStorage("volume", vol);
      return this;
    }
    // if (this.values.volume) { return this.values.volume; }
    return this.apiCall("volume");
  },
  muted: function(muted){
    if (muted !== undefined) {
      this.apiCall("setMuted", muted);
      return this;
    }
    return this.apiCall("muted");
  },

  width: function(width, skipListeners){
    if (width !== undefined) {
      this.el.width = width;
      this.el.style.width = width+"px";
      if (!skipListeners) { this.triggerEvent("resize"); }
      return this;
    }
    return parseInt(this.el.getAttribute("width"));
  },
  height: function(height){
    if (height !== undefined) {
      this.el.height = height;
      this.el.style.height = height+"px";
      this.triggerEvent("resize");
      return this;
    }
    return parseInt(this.el.getAttribute("height"));
  },
  size: function(width, height){
    // Skip resize listeners on width for optimization
    return this.width(width, true).height(height);
  },

  supportsFullScreen: function(){ return this.apiCall("supportsFullScreen"); },

  // Turn on fullscreen (or window) mode
  enterFullScreen: function(){
    this.videoIsFullScreen = true;
     if (typeof this.el.webkitRequestFullScreen == 'function') {
       this.el.webkitRequestFullScreen();
     } else if (typeof this.el.mozRequestFullScreen == 'function') {
       this.el.mozRequestFullScreen();
     } else if (this.supportsFullScreen()) {
       this.apiCall("enterFullScreen");
     } else {
       this.enterFullWindow();
     }
     this.triggerEvent("enterFullScreen");
     return this;
   },

   exitFullScreen: function(){
     this.videoIsFullScreen = false;
     if (typeof this.el.webkitRequestFullScreen == 'function') {
       document.webkitCancelFullScreen();
     } else if (this.supportsFullScreen()) {
       document.webkitExitFullScreen();
     } else {
       this.exitFullWindow();
     }
     this.triggerEvent("exitFullScreen");

    // Otherwise Shouldn't be called since native fullscreen uses own controls.
    return this;
  },

  enterFullWindow: function(){
    this.videoIsFullScreen = true;

    // Storing original doc overflow value to return to when fullscreen is off
    this.docOrigOverflow = document.documentElement.style.overflow;

    // Add listener for esc key to exit fullscreen
    _V_.addEvent(document, "keydown", _V_.proxy(this, this.fullWindowOnEscKey));

    // Hide any scroll bars
    document.documentElement.style.overflow = 'hidden';

    // Apply fullscreen styles
    _V_.addClass(document.body, "vjs-full-window");
    _V_.addClass(this.el, "vjs-fullscreen");

    this.triggerEvent("enterFullWindow");
  },

  fullWindowOnEscKey: function(event){
    if (event.keyCode == 27) {
      this.exitFullScreen();
    }
  },

  exitFullWindow: function(){
    this.videoIsFullScreen = false;
    _V_.removeEvent(document, "keydown", this.fullWindowOnEscKey);

    // Unhide scroll bars.
    document.documentElement.style.overflow = this.docOrigOverflow;

    // Remove fullscreen styles
    _V_.removeClass(document.body, "vjs-full-window");
    _V_.removeClass(this.el, "vjs-fullscreen");

    // Resize the box, controller, and poster to original sizes
    // this.positionAll();
    this.triggerEvent("exitFullWindow");
  },

  // src is a pretty powerful function
  // If you pass it an array of source objects, it will find the best source to play and use that object.src
  //   If the new source requires a new playback technology, it will switch to that.
  // If you pass it an object, it will set the source to object.src
  // If you pass it anything else (url string) it will set the video source to that
  src: function(source){
    // Case: Array of source objects to choose from and pick the best to play
    if (source instanceof Array) {

      var sources = source;

      techLoop: // Named loop for breaking both loops
      // Loop through each playback technology in the options order
      for (var i=0,j=this.options.techOrder;i<j.length;i++) {
        var techName = j[i],
            tech = _V_[techName];
            // tech = _V_.tech[techName];

        // Check if the browser supports this technology
        if (tech.isSupported()) {

          // Loop through each source object
          for (var a=0,b=sources;a<b.length;a++) {
            var source = b[a];

            // Check if source can be played with this technology
            if (tech.canPlaySource.call(this, source)) {

              // If this technology is already loaded, set source
              if (techName == this.currentTechName) {
                this.src(source); // Passing the source object

              // Otherwise load this technology with chosen source
              } else {
                this.loadTech(techName, source);
              }

              break techLoop; // Break both loops
            }
          }
        }
      }

    // Case: Source object { src: "", type: "" ... }
    } else if (source instanceof Object) {
      if (_V_[this.techName].canPlaySource(source)) {
        this.src(source.src);
      } else {
        // Send through tech loop to check for a compatible technology.
        this.src([source]);
      }
    // Case: URL String (http://myvideo...)
    } else {
      if (!this.isReady) {
        this.ready(function(){
          this.src(source);
        });
      } else {
        this.apiCall("src", source);
        if (this.options.preload == "auto") {
          this.load();
        }
        if (this.options.autoplay) {
          this.play();
        }
      }
    }
    return this;
  },

  // Begin loading the src data
  load: function(){
    this.apiCall("load");
    return this;
  },
  currentSrc: function(){
    return this.apiCall("currentSrc");
  },

  textTrackValue: function(kind, value){
    if (value !== undefined) {
      this.values[kind] = value;
      this.triggerEvent(kind+"update");
      return this;
    }
    return this.values[kind];
  },

  // Attributes/Options
  preload: function(value){
    if (value !== undefined) {
      this.apiCall("setPreload", value);
      this.options.preload = value;
      return this;
    }
    return this.apiCall("preload", value);
  },
  autoplay: function(value){
    if (value !== undefined) {
      this.apiCall("setAutoplay", value);
      this.options.autoplay = value;
      return this;
    }
    return this.apiCall("autoplay", value);
  },
  loop: function(value){
    if (value !== undefined) {
      this.apiCall("setLoop", value);
      this.options.loop = value;
      return this;
    }
    return this.apiCall("loop", value);
  },

  controls: function(){ return this.options.controls; },
  textTracks: function(){ return this.options.tracks; },
  poster: function(){ return this.apiCall("poster"); },

  error: function(){ return this.apiCall("error"); },
  networkState: function(){ return this.apiCall("networkState"); },
  readyState: function(){ return this.apiCall("readyState"); },
  seeking: function(){ return this.apiCall("seeking"); },
  initialTime: function(){ return this.apiCall("initialTime"); },
  startOffsetTime: function(){ return this.apiCall("startOffsetTime"); },
  played: function(){ return this.apiCall("played"); },
  seekable: function(){ return this.apiCall("seekable"); },
  ended: function(){ return this.apiCall("ended"); },
  videoTracks: function(){ return this.apiCall("videoTracks"); },
  audioTracks: function(){ return this.apiCall("audioTracks"); },
  videoWidth: function(){ return this.apiCall("videoWidth"); },
  videoHeight: function(){ return this.apiCall("videoHeight"); },
  defaultPlaybackRate: function(){ return this.apiCall("defaultPlaybackRate"); },
  playbackRate: function(){ return this.apiCall("playbackRate"); },
  // mediaGroup: function(){ return this.apiCall("mediaGroup"); },
  // controller: function(){ return this.apiCall("controller"); },
  controls: function(){ return this.apiCall("controls"); },
  defaultMuted: function(){ return this.apiCall("defaultMuted"); }
});