import { fixLineBreaks } from './vttparser';

export function newCue(track, startTime, endTime, captionScreen) {
  var row;
  var cue;
  var indenting;
  var indent;
  var text;
  var VTTCue = window.VTTCue || window.TextTrackCue;

  for (var r=0; r<captionScreen.rows.length; r++)
  {
    row = captionScreen.rows[r];
    indenting = true;
    indent = 0;
    text = '';

    if (!row.isEmpty())
    {
      for (var c=0; c<row.chars.length; c++)
      {
        if (row.chars[c].uchar.match(/\s/) && indenting)
        {
          indent++;
        }
        else
        {
          text += row.chars[c].uchar;
          indenting = false;
        }
      }
      //To be used for cleaning-up orphaned roll-up captions
      row.cueStartTime = startTime;

      // Give a slight bump to the endTime if it's equal to startTime to avoid a SyntaxError in IE
      if (startTime === endTime)
      {
        endTime += 0.0001;
      }

      cue = new VTTCue(startTime, endTime, fixLineBreaks(text.trim()));

      if (indent >= 16)
      {
        indent--;
      }
      else
      {
        indent++;
      }

      // VTTCue.line get's flakey when using controls, so let's now include line 13&14
      // also, drop line 1 since it's to close to the top
      if (navigator.userAgent.match(/Firefox\//))
      {
        cue.line = r + 1;
      }
      else
      {
        cue.line = (r > 7 ? r - 2 : r + 1);
      }
      cue.align = 'left';
      // Clamp the position between 0 and 100 - if out of these bounds, Firefox throws an exception and captions break
      cue.position = Math.max(0, Math.min(100, 100 * (indent / 32) + (navigator.userAgent.match(/Firefox\//) ? 50 : 0)));
      track.addCue(cue);
    }
  }
}

