function getCookie(name) {
  var match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
  return match ? match[2] : null;
}

function setCookie(name, value, days) {
  var d = new Date();
  d.setTime(d.getTime() + (days*24*60*60*1000));
  document.cookie = name + "=" + value + ";path=/;expires=" + d.toUTCString();
}

var params = new URLSearchParams(window.location.search);
var gclid = params.get('gclid');
var fbclid = params.get('fbclid');
if (gclid) setCookie('gclid', gclid, 90);
if (fbclid) setCookie('fbclid', fbclid, 7);

var attempts = 0;
var interval = setInterval(function() {
  attempts++;
  var form = document.getElementById('frm-generatedForm-contact-form');
  if (!form) {
    if (attempts > 30) clearInterval(interval);
    return;
  }
  clearInterval(interval);

  if (form.dataset.gclidBound) return;
  form.dataset.gclidBound = '1';

  form.addEventListener('submit', function() {
    if (!form.checkValidity()) return;

    var lastSent = sessionStorage.getItem('gclidLastSent');
    var now = Date.now();
    if (lastSent && (now - parseInt(lastSent)) < 5000) return;
    sessionStorage.setItem('gclidLastSent', now);

    var gclidVal = getCookie('gclid') || '';
    var fbclidVal = getCookie('fbclid') || '';
    var zdroj = gclidVal ? 'Google' : (fbclidVal ? 'Meta' : '');

    var data = {
      name: form.querySelector('[name="name"]') ? form.querySelector('[name="name"]').value : '',
      phone: form.querySelector('[name="phone"]') ? form.querySelector('[name="phone"]').value : '',
      email: form.querySelector('[name="email"]') ? form.querySelector('[name="email"]').value : '',
      address: form.querySelector('[name="address"]') ? form.querySelector('[name="address"]').value : '',
      message: form.querySelector('[name="message"]') ? form.querySelector('[name="message"]').value : '',
      build: form.querySelector('[name="build"]:checked') ? form.querySelector('[name="build"]:checked').value : '',
      gclid: gclidVal,
      fbclid: fbclidVal,
      zdroj: zdroj
    };

    navigator.sendBeacon(
      'https://script.google.com/macros/s/AKfycbxnYC0lpoJshusz4YnntmUMjArmcjd_A5lzRJwJUvevC7kpU4LX6242BgPg4mj80Lyk/exec',
      JSON.stringify(data)
    );
  });
}, 300);