(function() {
  var promo_id = 4019,
    old_key = "ducklett/scripts",
    initialized_attr = "initialized",
    target_src = function(p) {
      return (
        "https://aswidgets.travelpayouts.com/ducklett/scripts" +
        (p["locale"] || "") +
        ".js"
      );
    },
    klit_params_map = { shmarker: "marker", widget_type: "type", locale: null },
    ref = document.getElementsByTagName("script");

  for (var i = 0, len = ref.length; i < len; i++) {
    var script = ref[i];
    var src = script.getAttribute("src");
    var matches =
      src && src.match(new RegExp("promo_id=" + promo_id + "|" + old_key));

    if (src && !script.getAttribute("script-initialized") && matches) {
      script.setAttribute("script-initialized", true);

      function getParams() {
        var params = {};
        script.src.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m, key, value) {
          params[key] = decodeURIComponent(value);
        });
        return params;
      }

      var url_params = getParams(),
        raw_params = getParams(),
        js = document.createElement("script"),
        isOldEMBED = matches[0] == old_key;

      if (!isOldEMBED) {
        for (var source in klit_params_map) {
          if (klit_params_map.hasOwnProperty(source)) {
            var target = klit_params_map[source];
            if (target) url_params[target] = url_params[source];
            delete url_params[source];
          }
        }
      } else {
        var locale_match = src.match(/ducklett\/scripts_(\w\w).js/);
        raw_params["locale"] = locale_match && "_" + locale_match[1];
      }

      var params = [];
      for (var name in url_params) {
        if (url_params.hasOwnProperty(name)) {
          params.push(name + "=" + encodeURIComponent(url_params[name]));
        }
      }

      if (isOldEMBED) {
        js.setAttribute(initialized_attr, "true");
        js.setAttribute("script-initialized", "true");
      }

      target_src_string = target_src(raw_params);
      var separator = target_src_string.indexOf("?") === -1 ? "?" : "&";
      js.src = target_src_string + separator + params.join("&");
      script.parentNode.insertBefore(js, script);

      break;
    }
  }
})();