(function() {
  var SHOW_URL_IN_BRACES = false;
  var re = /^https?:\/\/twitter\.com\/(?:#!\/)?(\w+)\/status(?:es)?\/(\d+)/;

  function addPageTitleButtonOnTweet(elem) {
    var links = elem.getElementsByTagName('a');
    for (var i = 0, l = links.length; i < l; i++) {
      if (/\slink\s/.test(' ' + links[i].className + ' ')) {
        // avoid tweet url (there is already tweet_url_reply.js)
        if (!re.test(links[i].href)) addPageTitleButton(links[i]);
      }
    }
  }

  function addPageTitleButton(elem) {
    var b = document.createElement('a');
    var id = b.id = 'PageTitle_' + (Math.random() * 100000 | 0);
    b.href = '#';
    var img = new Image();
    img.src = '/images/inrep.png';
    b.appendChild(img);
    b.onclick = function() {

      window['show' + id] = function(res) {
        if (res.query.results) {
          var a = b.previousSibling;

          var title = res.query.results.title.replace(/\s+/g,' ');
          if (title.length > 200) title = title.slice(0, 200) + '…';
          var url = a.href;
          if (url.length > 200) url = url.slice(0, 200) + '…';

          a.innerHTML = '';
          a.appendChild(document.createTextNode(title + (SHOW_URL_IN_BRACES ? ' (' + url + ')' : '')));

        }
        window['show' + id] = null;
        b.parentNode.removeChild(b);
      };

      loadXDomainScript(
        'http://query.yahooapis.com/v1/public/yql?q=' +
        encodeURIComponent('select * from html where url="' +
          elem.href +
          '" and xpath="//title"') +
        '&format=json&diagnostics=false&callback=' +
        'show' + id);

      return false;
    };

    elem.parentNode.insertBefore(b, elem.nextSibling);
  }

  registerPlugin({
    newMessageElement : addPageTitleButtonOnTweet,
  });

}());