(function () {
  try {
    var semaphore_cookie = '_gaq_semaphore';
    var utms = {
      utm_source: true,
      utm_medium: true,
      utm_term: true,
      utm_content: true,
      utm_campaign: true
    };

    // クッキー処理で使うtrim関数を定義
    var trim = function (s) {
      return String(s).replace(/^(\s+)|(\s+$)/g, '');
    };

    // 指定したキーのクッキー値を返す関数を定義
    var cookie_value = function (key) {
      var cookies = document.cookie.split(';');
      for (var i = 0; i < cookies.length; i++) {
        var cookie = cookies[i].split('=');
        if (unescape(trim(cookie[0])) === key) {
          return unescape(trim(cookie[1]));
        }
      }
      return false;
    };

    var do_redirect = false;
    var queries = [];
    var url = document.location.toString();
    var matches = url.match(/(.+?)\?(.+)/);

    if (matches) {
      url = matches[1];
      var query_string = matches[2].split(/&/);
      for (var i = 0; i < query_string.length; i++) {
        var param = query_string[i].split(/=/);
        if (utms[param[0]]) {
          do_redirect = true;
        } else {
          queries.push(query_string[i]);
        }
      }
    }

    if (location.href === cookie_value(semaphore_cookie)) {
      document.cookie = semaphore_cookie + '=;expires=' + new Date((new Date().getTime()) - 86400).toGMTString();
    } else {
      if (do_redirect) {
        document.cookie = semaphore_cookie + '=' + escape(url);
        if (queries.length) {
          url += '?' + queries.join("&");
        }
        location.href = url;
      } else {
        var ga = document.createElement('script');
        ga.type = 'text/javascript';
        ga.async = true;
        ga.src = ('https:' === document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
        var s = document.getElementsByTagName('script')[0];
        s.parentNode.insertBefore(ga, s);
      }
    }
  } catch (err) {
    console.error(err);
  }
})();