var Wistiamara = {
/* Version 3.0, 15 Oct 2013 */
  
  _version: "3.0",
  
  _url: null,
  _style_block: null,
  _refresh_ms: 20,
  _default_language: 'en',
  _players: [],
  _nomodrewrite: false,
  _apiversion: 2,
  NOLANGCODE: '--',
  VIDEOTYPE: 1,
  PLAYLISTTYPE: 2,
  
  
  init: function ( serviceURL, options ) {
    if (! options) { options = {}; };
    var o = {
      nomodrewrite: false,
      apiversion: 2
    };
    for( var p in options ) { o[p] = options[p] };
        
    Wistiamara._url = serviceURL;
    Wistiamara._nomodrewrite = o.nomodrewrite;
    Wistiamara._apiversion = o.apiversion;
    if (Wistiamara._url.indexOf('/', Wistiamara._url.length - 1) === -1) {
      Wistiamara._url = Wistiamara._url + '/';
    }
    
  },
  
  _trackEvent: function( action, label, value ) {
    if (ga) {
      switch(arguments.length) {
          case 1: ga('send', 'event', 'wistiamara', action ); return;
          case 2: ga('send', 'event', 'wistiamara', action, label); return;
          case 3: ga('send', 'event', 'wistiamara', action, label, value); return;
          default: throw new Error('illegal argument count')
      }
    }
  },

  insertPlaylist: function( id, urlprefix, options, email ) {
    if (! Wistiamara._url ) { throw "Wistiamara must be initialized with the URL of its server side portion."; };
    if (! options) { options = {}; };
    var o = {
      volumeControl: true,
      videoWidth: 640,
      videoHeight: 360,
      autoPlay: false,
      controlsVisibleOnLoad: false
    };
    for( var p in options ) { o[p] = options[p] };
    
    document.write( '<div id="wistia_' + id + '" class="wistia_embed" style="width:' + o.videoWidth + 'px;height:' + o.videoHeight + 'px;" data-video-width="' + o.videoWidth + '" data-video-height="' + o.videoHeight + '">&nbsp;</div>' );

    var wpl = Wistia.playlist( id, {
            version: "v1",
            theme: "tab",
            videoOptions: {
              volumeControl: o.volumeControl,
              autoPlay: o.autoPlay,
              videoWidth: o.videoWidth,
              videoHeight: o.videoHeight,
              trackEmail: email
            },
            media_0_0: {
              autoPlay: o.autoPlay,
              controlsVisibleOnLoad: o.controlsVisibleOnLoad
            }
        });
    
    Wistiamara.bindPlaylist( wpl, urlprefix );
  },

  bindPlaylist: function( pl, urlprefix ) {
    if (! Wistiamara._url ) { throw "Wistiamara must be initialized with the URL of its server side portion."; };

    switch (Wistiamara._apiversion) {
      case 1:
        if ( urlprefix.indexOf('http://') === 0 ) { urlprefix = urlprefix.substr(7); }
        else if ( urlprefix.indexOf('https://') === 0 ) { urlprefix = urlprefix.substr(8); }
        break;
      case 2: // Use as-is
        break;
      default:
        alert('Unknown Wistiamara API version.');
        return null;
    }

    if (! pl.wistiamara ) {
      pl.wistiamara = {
                        'data':{},
                        'urlprefix':urlprefix,
                        'lang':false,
                        'interval':false,
                        'showing':{ 'time':null, 'title':null, 'b':null, 'e':null },
                        'type': Wistiamara.PLAYLISTTYPE,
                      };
    }
    
    Wistiamara._create_elements( pl );
    
    pl.bind( 'beforeembed', function( si, vi ){ Wistiamara._onBeforeEmbed(pl, si, vi); } );
    pl.bind( 'afterembed', function( si, vi ){ Wistiamara._onAfterEmbed(pl, si, vi); } );
    pl.bind( 'play', function( ){ Wistiamara._onPlay( pl ); } );
    pl.bind( 'pause', function( ){ Wistiamara._onPause( pl ); } );
    pl.bind( 'end', function( ){ Wistiamara._onEnd( pl ); } );
    pl.bind( 'timechange', function( ){ Wistiamara._onTimeChange( pl ); } );
    pl.wistiamara.select.onchange = function() { Wistiamara._onLanguageSelectChanged( pl ); };
    
    Wistiamara._players.push( pl );
  },


  insertVideo: function( id, urlprefix, options, email ) {
    if (! Wistiamara._url ) { throw "Wistiamara must be initialized with the URL of its server side portion."; };
    if (! options) { options = {}; };
    var o = {
      volumeControl: true,
      videoWidth: 640,
      videoHeight: 360,
      autoPlay: false,
      controlsVisibleOnLoad: false
    };
    for( var p in options ) { o[p] = options[p] };
    
	document.write( '<div id="wistia_' + id + '" class="wistia_embed" style="width:' + o.videoWidth + 'px;height:' + o.videoHeight + 'px;" data-video-width="' + o.videoWidth + '" data-video-height="' + o.videoHeight + '">&nbsp;</div>' );
   
    wv = Wistia.embed(id, {
      version: "v1",
      videoWidth: o.videoWidth,
      videoHeight: o.videoHeight,
      fullscreenButton: false,
      container: "wistia_" + id,
      trackEmail: email
    });
    
    Wistiamara.bindVideo( wv, urlprefix, o );    
  },

  bindVideo: function( vid, urlprefix, options ) {
    if (! Wistiamara._url ) { throw "Wistiamara must be initialized with the URL of its server side portion."; };

    if (! options) { options = {}; };
    var o = {
      videoWidth: 640,
      videoHeight: 360,
    };
    for( var p in options ) { o[p] = options[p] };

    switch (Wistiamara._apiversion) {
      case 1:
        if ( urlprefix.indexOf('http://') === 0 ) { urlprefix = urlprefix.substr(7); }
        else if ( urlprefix.indexOf('https://') === 0 ) { urlprefix = urlprefix.substr(8); }
        break;
      case 2: // Use as-is
        break;
      default:
        alert('Unknown Wistiamara API version.');
        return null;
    }

    if (! vid.wistiamara ) {
      vid.wistiamara = {
                        'data':{},
                        'urlprefix':urlprefix,
                        'lang':false,
                        'interval':false,
                        'showing':{ 'time':null, 'title':null, 'b':null, 'e':null },
                        'type': Wistiamara.VIDEOTYPE,
                      };
    }
    
    Wistiamara._create_elements( vid );
    
    vid.ready( function() {
      Wistiamara._onBeforeEmbed(vid, 0, 0);
      Wistiamara._onAfterEmbed(vid, 0, 0);
      vid.container.style.height = '' + o.videoHeight + 'px';
      vid.container.style.width = '' + o.videoWidth + 'px';
    } );
    vid.bind( 'play', function( ){ Wistiamara._onPlay( vid ); } );
    vid.bind( 'pause', function( ){ Wistiamara._onPause( vid ); } );
    vid.bind( 'end', function( ){ Wistiamara._onEnd( vid ); } );
    vid.bind( 'timechange', function( ){ Wistiamara._onTimeChange( vid ); } );
    vid.wistiamara.select.onchange = function() { Wistiamara._onLanguageSelectChanged( vid ); };
    
    Wistiamara._players.push( vid );
  },
  
  _onBeforeEmbed: function( player, si, vi ) {
    var hid;
    if (player.wistiamara.type == Wistiamara.PLAYLISTTYPE) {
      hid = player.data[si].medias[vi].embed_config.media.hashedId;
    } else if (player.wistiamara.type == Wistiamara.VIDEOTYPE)  {
      hid = player.data.media.hashedId;
    }
    player.wistiamara.subtitle_panel.innerHTML = ''; 
    player.wistiamara.showing.time = null; 
    if ( ! player.wistiamara.data[hid] ) {
      player.wistiamara.subtitle_panel.style.display = "none";
      player.wistiamara.loading_panel.style.display = "block";
      player.wistiamara.data[hid] = Wistiamara.getAmaraData( player.wistiamara.urlprefix, hid );
    }
    
  },
  
  _onAfterEmbed: function( player, si, vi ) {
    var hid;
    if (player.wistiamara.type == Wistiamara.PLAYLISTTYPE) {
      hid = player.data[si].medias[vi].embed_config.media.hashedId;
    } else if (player.wistiamara.type == Wistiamara.VIDEOTYPE)  {
      hid = player.data.media.hashedId;
    }
    player.wistiamara.loading_panel.style.display = "none";
    player.wistiamara.subtitle_panel.style.display = "none";
    // Make sure the current language exists, and is compatible with the new video.
    if ((! player.wistiamara.lang ) || (! player.wistiamara.data[hid].languages[ player.wistiamara.lang ] )) {
      player.wistiamara.lang = Wistiamara.NOLANGCODE;
    }
    if (player.wistiamara.select.firstChild) { player.wistiamara.select.removeChild(player.wistiamara.select.firstChild); };
    player.wistiamara.select.appendChild( player.wistiamara.data[hid].optgroup );
    player.wistiamara.select.value = player.wistiamara.lang;
  },
  
  _onPlay: function( player ) {
    Wistiamara._playSubs( player );
  },

  _onPause: function( player ) {
    Wistiamara._pauseSubs( player );
  },

  _onEnd: function( player ) {
    // nothing yet
  },

  _onTimeChange: function( player ) {
    Wistiamara.showCurrentSubtitle(player);
  },
  
  _playSubs: function( player ) {
    if ( player.wistiamara.interval === false ) {  // If this is not false, the subs are already playing.
      player.wistiamara.interval = window.setInterval( function(){  Wistiamara.showCurrentSubtitle(player);  }, Wistiamara._refresh_ms );
    };
  },

  _pauseSubs: function( player ) {
    if ( player.wistiamara.interval !== false ) { 
      window.clearInterval( player.wistiamara.interval );
      player.wistiamara.interval = false;
    }
  },

  _stopSubs: function( player ) {
    if ( player.wistiamara.interval !== false ) { 
      window.clearInterval( player.wistiamara.interval );
      player.wistiamara.interval = false;
    }
    player.wistiamara.subtitle_panel.innerHTML = ''; // Difference between 'pause' and 'stop': stop clears the display.
    player.wistiamara.showing.time = null; // and cache
  },
  
  _onLanguageSelectChanged: function( player ) {
    var newlang = player.wistiamara.select.value;
    if ( newlang === player.wistiamara.lang ) { return; }
    var resultlang = Wistiamara.trySwitchLanguage( player, newlang );
    if ( newlang != resultlang ) { player.wistiamara.select.value = resultlang; };
  },
  
  trySwitchLanguage: function( player, code ) {
    var hid = null;
    if (player.wistiamara.type == Wistiamara.PLAYLISTTYPE) {
      hid = player.currentVideo().hashedId();
    } else if (player.wistiamara.type == Wistiamara.VIDEOTYPE)  {
      hid = player.data.media.hashedId;
    }
    
    if ( (player.wistiamara.data[hid].languages[code]) || ( code == Wistiamara.NOLANGCODE ) ) {
      player.wistiamara.lang = code;
      player.wistiamara.showing.time = null;
      if ( code == Wistiamara.NOLANGCODE ) {
        Wistiamara._trackEvent('disable subtitles');
      } else {
        Wistiamara._trackEvent('enable subtitles', code);
      } 
      Wistiamara.showCurrentSubtitle( player );
      return code;
    } else {      
      return player.wistiamara.lang;
    }
  },
  
  getAmaraData: function( prefix, hid ) {
    var r, url;
    
    switch (Wistiamara._apiversion) {
      case 1:
        url = Wistiamara._url + (Wistiamara._nomodrewrite ? 'wistiamara.php?PATH_INFO=' : '') + "subtitles/" + prefix + encodeURIComponent( hid );
        break;
      case 2:
        url = Wistiamara._url + (Wistiamara._nomodrewrite ? 'wistiamara.php?PATH_INFO=' : '') + "subtitles/" + (Wistiamara._nomodrewrite ? '&' : '?') + 'api_version=2&url=' + encodeURIComponent( prefix + hid );
        break;
      default:
        alert('Unknown Wistiamara API version.');
        return null;
    }
    
    Wistiamara.rawAJAX(
      url, "GET", true,
      function(xrq) {
        if (xrq.readyState == 4) {
          if ( xrq.status == 200 )  {
            r = xrq.responseText;
          } else {
            throw "Could not retrieve subtitles."
          }
        }
      }
    );
    r = JSON.parse(r);
    
    
    if (! r['languages']) { r.languages = [];}    
    r.lookup = {};
    r.optgroup = document.createElement('OPTGROUP');
    var opt;

    for( var code in r.languages ){
      if (! r.subtitles[code]) {
        delete r.languages[code];
      }
    }
    
    opt = document.createElement('OPTION');    
    opt.value = Wistiamara.NOLANGCODE;
    if (r.language_count < 1) {
      opt.text = "( No Subtitles Available )";
    } else {
      opt.text = "( Subtitles Off )";
    }
    r.optgroup.appendChild(opt);

    for( var code in r.languages ){
      var titles = r.subtitles[code];
      var t, bm, em;
      var currmintitles = [];
      var currmin = 0;
      var minutetrees = [];
      
      for( var i=0; i<titles.length; i++ ) {
        t = titles[i];
        bm = ( t.begin / 60000 ) << 0; // Left shift 0: fast truncate-to-int
        em = ( t.end   / 60000 ) << 0;
        
        if ( (bm <= currmin) && (em >= currmin) ) { currmintitles.push(i); }
        if ( bm > currmin ) {
          // End of current minute
          for (var m=currmin; m<bm; m++) { minutetrees[m]=null; };
          minutetrees[ currmin ] = Wistiamara._maketimetree( titles, currmintitles );
          currmintitles = [ i ];
          currmin = bm;
        }
        
      }
      minutetrees[ currmin ] = Wistiamara._maketimetree( titles, currmintitles );
      
      r.lookup[code] = minutetrees;
      opt = document.createElement('OPTION');
      opt.value = code;
      opt.text = r.languages[code];
      r.optgroup.appendChild(opt);
    }
    
    if (!r.ok) {
      alert('Amara error on video "' + hid + '": ' + r.error_msg);
    }

    return r;
  },
  
  showCurrentSubtitle: function( player ) {
    var title = Wistiamara.getCurrentSubtitle( player );
    
    if ( title ) {
      player.wistiamara.subtitle_panel.innerHTML = title;
      player.wistiamara.subtitle_panel.style.display = 'block';
    } else {
      player.wistiamara.subtitle_panel.innerHTML = '';
      player.wistiamara.subtitle_panel.style.display = 'none';
    }
    
  },
  
  getCurrentSubtitle: function( player ) {
    if (! player.wistiamara.lang) { return null; } // This happens if the current video has no subtitles.
    if (player.wistiamara.lang == Wistiamara.NOLANGCODE) { return null; } // This happens if the subtitles are turned off.

    var v;
    if (player.wistiamara.type == Wistiamara.PLAYLISTTYPE) {
      v = player.currentVideo();
    } else if (player.wistiamara.type == Wistiamara.VIDEOTYPE)  {
      v = player;
    }

    if (! v) { return null; }
    var id = v.hashedId();
    if (! id) { return null; }
    var data = player.wistiamara.data[ id ];
    if (! data) { return null; }

    var ms = v.time() * 1000;
    if ( isNaN(ms) ) { return null; };
    if ( player.wistiamara.showing.time ) {
      if (( ms >= player.wistiamara.showing.b ) && ( ms <= player.wistiamara.showing.e )) { return player.wistiamara.showing.title; }
    }
    
    var min = (ms / 60000) << 0; // Left shift 0: fast truncate-to-int
    
    var tree = data.lookup[player.wistiamara.lang][min];
    if (! tree) { return null; }
    
    var i = Wistiamara._seektimetree( tree, ms );
    if (i === null) { return null; }
    
    var t = data.subtitles[player.wistiamara.lang][i];
    player.wistiamara.showing.time = ms;
    var h = player.wistiamara.showing.title = t.html;
    player.wistiamara.showing.b = t.begin;
    player.wistiamara.showing.e = t.end;
    return h;
  },
  
  _seektimetree: function( node, ms ) {
    if (! node) { return null; }
    if ( ms < node.b ) { return Wistiamara._seektimetree( node.l, ms ); }
    if ( ms > node.e ) { return Wistiamara._seektimetree( node.r, ms ); }
    return node.i;
  },
  
  _maketimetree: function( src, set ) {
    if (set.length < 1) { return null; }
    var pivot = set.length >> 1;
    var lset = (pivot>0) ? set.slice(0, pivot) : [];
    var rset = (pivot<(set.length-1)) ? set.slice(pivot+1) : [];
    var i = set[pivot];
    var c = 1;
    var l = Wistiamara._maketimetree(src, lset);
    var r = Wistiamara._maketimetree(src, rset);
    if (l) { c+= l.c; }
    if (r) { c+= r.c; }
    return { i:i, c:c, b:src[i].begin, e:src[i].end, l:l, r:r };
  },
  
  rawAJAX: function (url, method, sync, responseHandler, data, headers) {    
    sync = !!sync;
    data = data || {};
    headers = headers || {};
    
    methods = { 'GET':true, 'POST':true };
    method = method || 'GET'; method = method.toUpperCase();
    if (! methods[method] ) { method = 'GET'; };

    if(! url) { throw "Cannot use an AJAX request without an URL."; }
    
    if (data instanceof Object) {
      var a = [];
      for(var p in data) { a.push(encodeURIComponent(p) + "=" + encodeURIComponent(data[p])); }
      data = a.join("&");
    }
    
    var xrq = false;
    if (window.XMLHttpRequest) {
      xrq = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
      xrq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    if (! xrq) { throw "Could not create XMLHttpRequest"; };

    if(method == "GET") {
      if ( data ) { url = url + "?" + data; };
      data = null;
    }
    xrq.open(method, url, (!sync));
    
    if(method == "POST")
    {
      xrq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    }
    for(var h in headers) { xrq.setRequestHeader(h, headers[h]); }
    
    xrq.onreadystatechange = function () {
      responseHandler(xrq);
    };
    xrq.send(data);
  },
  
  _create_elements: function( player ) {

    // Create the blank loading_panel before checking for the style blocks, so we can use it for feature detection.
    var loading_panel = document.createElement('DIV');
    
    if ( !Wistiamara._style_block ) {      
      Wistiamara._style_block = document.createElement('STYLE');
      Wistiamara._style_block.setAttribute( 'type', 'text/css' );
      if ( (loading_panel.style.boxShadow !== '') && (loading_panel.style.filter === '') ) { // Older IE: No box-shadow, but has filter
        Wistiamara._style_block.innerHTML = Wistiamara._css + "\n\n" + Wistiamara._css_old_ie;
      } else {
        Wistiamara._style_block.innerHTML = Wistiamara._css;        
      }
      document.getElementsByTagName('HEAD')[0].appendChild( Wistiamara._style_block );
    }
    

    loading_panel.className = 'wistiamara_loader';
    
    var img = document.createElement('IMG');
    img.setAttribute('src', Wistiamara._loader_image);
    img.style.display = 'block';
    img.style.margin = '15px auto 30px';
    
    loading_panel.appendChild( img );
    loading_panel.appendChild( document.createTextNode('LOADING SUBTITLES') );
    
    var subtitle_panel = document.createElement('DIV');
    subtitle_panel.className = 'wistiamara_subtitle';
    
    var select = document.createElement('SELECT');
    select.className = 'wistiamara_select';
    
    player.container.style.position = 'relative';
    player.container.appendChild( loading_panel );
    player.container.appendChild( subtitle_panel );
    player.container.appendChild( select );
    player.wistiamara.loading_panel = loading_panel;
    player.wistiamara.subtitle_panel = subtitle_panel;
    player.wistiamara.select = select;
    
    player.container.style.height = '' + (player.container.offsetHeight + player.wistiamara.select.offsetHeight + 3) + 'px';
  },
  
  _css: ".wistiamara_loader { \n\
              width: 30%; \n\
              height: 30%; \n\
              background: #FFF; \n\
              color: #000; \n\
              text-align: center; \n\
              font-size: 130%; \n\
              padding: 5%; \n\
              box-shadow: 3px 3px 5px #000; \n\
              border-radius: 6px; \n\
              z-index: 100000; \n\
              display: none; \n\
              position: absolute; \n\
              left: 25%; \n\
              top: 25%; \n\
          } \n\
          .wistiamara_select { \n\
            width: 30%; \n\
            min-width:160px; \n\
            display:block; \n\
            margin: 3px 0 0; \n\
            clear: both \n\
          } \n\
          \n\
          .wistiamara_select option { \n\
            padding-left: 2px; \n\
          } \n\
          \n\
          .wistiamara_subtitle { \n\
              z-index: 9900; \n\
              width: 66%; \n\
              font: 16px bold Helvetica,Arial,sans-serif; \n\
              display: block; \n\
              position: absolute; \n\
              bottom: 10%; \n\
              background: #333; \n\
              background: rgba(0,0,0,0.8); \n\
              padding: 5px; \n\
              border-radius: 0.5em; \n\
              left: 17%; \n\
              text-align: center; \n\
              color: #FFF; \n\
              display: none; \n\
          } \n\
          ",
  
  _css_old_ie: ".wistiamara_subtitle { \n\
              filter: progid:DXImageTransform.Microsoft.Chroma(color='black') \n\
                      progid:DXImageTransform.Microsoft.Alpha(opacity=100) \n\
                      progid:DXImageTransform.Microsoft.dropshadow(color=#000000,offX=1,offY=1) \n\
                      progid:DXImageTransform.Microsoft.dropshadow(color=#000000,offX=-1,offY=1) \n\
                      progid:DXImageTransform.Microsoft.dropshadow(color=#000000,offX=1,offY=-1) \n\
                      progid:DXImageTransform.Microsoft.dropshadow(color=#000000,offX=-1,offY=-1); \n\
          } \n\
          ",
  
  _loader_image: "data:image/gif;base64,R0lGODlhIAAgAPMAAP///wAAAMbGxoSEhLa2tpqamjY2NlZWVtjY2OTk5Ly8vB4eHgQEBAAAAAAAA\
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                  oZmADdEAAAh+QQJCgAAACwAAAAAIAAgAAAE6hDISWlZpOrNp1lGNRSdRpDUolIGw5RUYhhHukqFu8DsrEyqnWThGvAmhVlteBvo\
                  jpTDDBUEIFwMFBRAmBkSgOrBFZogCASwBDEY/CZSg7GSE0gSCjQBMVG023xWBhklAnoEdhQEfyNqMIcKjhRsjEdnezB+A4k8gTw\
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