(function () {
  var ld_trk_campaign_id_regex = /ld_trk=(\d+)?/;

  var url_ld_trk_match = window.location.search.match(ld_trk_campaign_id_regex);
  var campaign_id;

  if (url_ld_trk_match) {
    document.cookie = 'ld_trk=1; path=/';

    initialize();
  } else {
    var cookie_ld_trk_match = document.cookie.match(ld_trk_campaign_id_regex);
    if (!cookie_ld_trk_match) return;

    initialize();
  }

  function initialize () {
    track();

    var latest_url = window.location.href;
    setInterval(function () {
      var current_url = window.location.href;
      if (current_url !== latest_url) {
        latest_url = current_url;
        track();
      }
    }, 500);
  }

  function track() {
    var cookie_object = getCookieObjectFromString(document.cookie);
    var pageview_count = (cookie_object.ld_pv || 0) + 1;

    document.cookie = "ld_pv=" + pageview_count + "; path=/";

    new Image(1,1).src = 'https://trk.lockerdome.com/ldpix.gif?ldc=9927346841128448_hivemedia_impression&page='+pageview_count+'&ord='+Date.now();

    if (pageview_count === 10) {
      new Image(1,1).src = 'https://trk.lockerdome.com/ldpix.gif?ldc=9927346841128448_hivemedia_impression_goal&ord='+Date.now();
    }
  }

  function getKeyValuePairFromCookieString (cookieString) {
    // "=" is a valid character in a cookie value according to RFC6265, so cannot `split('=')`
    var separatorIndex = cookieString.indexOf('=');

    // IE omits the "=" when the cookie value is an empty string
    separatorIndex = separatorIndex < 0 ? cookieString.length : separatorIndex;

    var value = decodeURIComponent(cookieString.substr(separatorIndex + 1));
    try {
      value = JSON.parse(value);
    }
    catch(e){}

    return {
      key: decodeURIComponent(cookieString.substr(0, separatorIndex)),
      value: value
    };
  }

  function getCookieObjectFromString (documentCookie) {
    var cookieObject = {};
    var cookiesArray = documentCookie ? documentCookie.split('; ') : [];

    for (var i = 0; i < cookiesArray.length; i++) {
      var cookieKvp = getKeyValuePairFromCookieString(cookiesArray[i]);

      if (cookieObject[cookieKvp.key] === undefined) {
        cookieObject[cookieKvp.key] = cookieKvp.value;
      }
    }

    return cookieObject;
  }
})();