/*
 * jQuery srt
 *
 * version 0.1 (November 28, 2008)
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 */
/*
  usage:
    <video src="example.ogg" id="examplevideo" />
    <div class="srt" data-video="examplevideo" data-srt="example.srt"></div>

  jquery.srt.js will try to load subtitles in all elements with 'srt' class.
  'data-video' atribute is used to link to the related video,
  if no data-srt is provided, the contents of the div is parsed as srt.
*/

$(document).ready(function() {
  function toSeconds(t) {
    var s = 0.0
    if(t) {
      var p = t.split(':');
      for(i=0;i<p.length;i++)
        s = s * 60 + parseFloat(p[i].replace(',', '.'))
    }
    return s;
  }
  function strip(s) {
    return s.replace(/^\s+|\s+$/g,"");
  }
  function playSubtitles(subtitleElement) {
    var videoId = subtitleElement.attr('data-video');
    var srt = subtitleElement.text();
    subtitleElement.text('');
    srt = srt.replace(/\r\n\r\n\r\n|\r\r\r|\n\n\n/g, '\n\n');
    srt = srt.replace(/\r\n|\r|\n/g, '\n');

    var subtitles = {};
    srt = strip(srt);
    var srt_ = srt.split('\n\n');
    for(s in srt_) {
        st = srt_[s].split('\n');
        if(st.length >=2) {
          n = st[0];
          i = strip(st[1].split(' --> ')[0]);
          o = strip(st[1].split(' --> ')[1]);
          t = st[2];
          if(st.length > 2) {
            for(j=3; j<st.length;j++)
              t += '\n'+st[j];
          }
          is = toSeconds(i);
          os = toSeconds(o);
          subtitles[is] = {i:i, o: o, t: t};
        }
    }

    var currentSubtitle = -1;

    var ival = setInterval(function() {
      var videoElement = document.getElementById(videoId);
      if(videoElement != undefined){
        var currentTime = videoElement.currentTime;
        var subtitle = -1;
        for(s in subtitles) {
          if(s > currentTime)
            break
          subtitle = s;
        }
        if(subtitle > 0) {
          if(subtitle != currentSubtitle) {
        subtitleElement.html(subtitles[subtitle].t);
            currentSubtitle=subtitle;
          } else if(subtitles[subtitle].o < currentTime) {
            subtitleElement.html('');
          }
        }
      }
      else{
      }
    }, 10);
  }

  function parsePageSubtitles() {
	  $('.srt').each(function() {
		var subtitleElement = $(this);
		var videoId = subtitleElement.attr('data-video');
		if(!videoId) return;
		var srtUrl = subtitleElement.attr('data-srt');
		if(srtUrl) {
		  $(this).load(srtUrl, function (responseText, textStatus, req) {playSubtitles(subtitleElement)})
		} else {
		  playSubtitles(subtitleElement);
		}
	  });
	}
	parsePageSubtitles();
});