function formatGCalTime(gCalTime) {
  // text for regex matches
  var remtxt = gCalTime;

  function consume(retxt) {
    var match = remtxt.match(new RegExp('^' + retxt));
    if (match) {
      remtxt = remtxt.substring(match[0].length);
      return match[0];
    }
    return '';
  }

  var totalCorrMins = 0;

  var year = consume('\\d{4}');
  consume('-?');
  var month = consume('\\d{2}');
  consume('-?');
  var dateMonth = consume('\\d{2}');
  var timeOrNot = consume('T');

  if (timeOrNot == 'T') {
    var hours = consume('\\d{2}');
    consume(':?');
    var mins = consume('\\d{2}');
    consume('(:\\d{2})?(\\.\\d{3})?');
    var zuluOrNot = consume('Z');

    if (zuluOrNot != 'Z') {
      var corrPlusMinus = consume('[\\+\\-]');
      if (corrPlusMinus != '') {
        var corrHours = consume('\\d{2}');
        consume(':?');
        var corrMins = consume('\\d{2}');
        totalCorrMins = (corrPlusMinus=='-' ? 1 : -1) *
            (Number(corrHours) * 60 +
	    (corrMins=='' ? 0 : Number(corrMins)));
      }
    }
    var originalDateEpoch = Date.UTC(year, month - 1, dateMonth, hours, mins);
    var gmtDateEpoch = originalDateEpoch + totalCorrMins * 1000 * 60;
    var ld = new Date(gmtDateEpoch);
    dateString = (ld.getMonth() + 1) + '/' + ld.getDate() + ' ' +
        ((ld.getHours()>12)?(ld.getHours()-12):(ld.getHours()===0?12:
	ld.getHours())) + ':' + ((ld.getMinutes()<10)?('0' +
	ld.getMinutes()):(ld.getMinutes())) + ' ' +
	((ld.getHours()>=12)?'PM':'AM');
  } else {
    dateString =  parseInt(month, 10) + '/' + parseInt(dateMonth, 10);
  }
  return dateString;
}
function listEvents(root, divId) {
  var feed = root.feed;
  var events = document.getElementById(divId);

  if (events.childNodes.length > 0) {
    events.removeChild(events.childNodes[0]);
  }

  var ul = document.createElement('ul');

  for (var i = 0; i < feed.entry.length; i++) {
    var entry = feed.entry[i];
    var title = entry.title.$t;
    var start = entry['gd$when'][0].startTime;

    /*for (var linki = 0; linki < entry['link'].length; linki++) {
      if (entry['link'][linki]['type'] == 'text/html' &&
          entry['link'][linki]['rel'] == 'alternate') {
        var entryLinkHref = entry['link'][linki]['href'];
      }
    }*/

    var dateString = formatGCalTime(start);
    var li = document.createElement('li');

    if (typeof entryLinkHref != 'undefined') {
      entryLink = document.createElement('a');
      entryLink.setAttribute('href', entryLinkHref);
      entryLink.appendChild(document.createTextNode(title));
      li.appendChild(entryLink);
      li.appendChild(document.createTextNode(' (' + dateString + ')'));
    } else {
      li.appendChild(document.createTextNode(title + ' (' + dateString + ')'));
    }

    // append the list item onto the unordered list
    ul.appendChild(li);
  }
  events.appendChild(ul);
}

function insertAgenda(root) {
  listEvents(root, 'agenda');
}