(function () {
  const cookieName = 'affId';

  const saveAnalytics = (event, refId) => {
    var myHeaders = new Headers();
    myHeaders.append('Accept', 'application/json');
    myHeaders.append('Content-Type', 'application/json');

    fetch('https://affiliate.seed4.me/affiliate-analytics/register-event', {
      method: 'POST',
      credentials: 'include',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json',
        'Origin': '*'
      },
      body: JSON.stringify({
        'event': event,
        'refId': refId
      }),
      redirect: 'follow'
    });
  }

  const urlParams = [
    'ref',
    'from',
    'invite',
    'friend',
    'aid',
    'wmid',
  ];

  const setCookie = (name, value, days) => {
    var expires;
    if (days) {
      var date = new Date();
      date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
      expires = '; expires=' + date.toGMTString();
    } else {
      expires = '';
    }

    document.cookie = encodeURIComponent(name) + '=' + encodeURIComponent(value) + expires + '; path=/';
  }

  const parseUrl = () => new Promise((resolve, reject) => {
    const url = new URL(window.location.href);
    urlParams.forEach((p) => {
      const affID = url.searchParams.get(p);
      if (affID) {
        setCookie(cookieName, affID, 30);
        ga('send', 'affiliate_link_used', { 'affiliate' : affID });
        saveAnalytics('affiliate_link_used', affID);
      }
    });

    resolve();
  });

  window.onload = () => parseUrl();
})();