const UTM_KEYS = [
  "utm_medium",
  "utm_content",
  "utm_campaign",
  "utm_source",
  "utm_referrer",
  "gad_source",
  "gclid",
];

const validateUTMs = () => {
  // get query params
  const queryString = window.location.search.substring(1);
  const urlParams = new URLSearchParams(queryString);

  // If exists key value add to sessionStorage
  for(const key of UTM_KEYS) {
    const param = urlParams.get(key);
    if(!!param) sessionStorage.setItem(key, param);
  }
}

const addUTMsToFields = () => {
  // If exists key value add to field value
  for(const key of UTM_KEYS) {
    const value = sessionStorage.getItem(key);
    const input = document.querySelector(`input[name="${key}"]`);

    if(!!value && !!input) input.value = value;
  }
}

window.addEventListener("load", async function () {
  validateUTMs();
  addUTMsToFields();
});