const UGOpp = {};

const __kf_course_id_regex = /[0-9]+$/;

function _injectQuickLinks() {
  const table = Common.$G("idLVOfferTab")
  if (table?.querySelector(".kf-groups-quick-link")) return;

  const rows = table.querySelectorAll("tr.hi");

  rows.forEach((row) => {
    const tds = row.querySelectorAll("td")
    const mainLink = tds[3].querySelector("a");
    const courseId = mainLink.href.match(__kf_course_id_regex)[0];
    const link = Common.$C("a", {classList: "kf-groups-quick-link", href:`https://online.uni-graz.at/kfu_online/sa.gruppen_einteilung?cLvNr=${courseId}`, children:["👥"]})
    tds[2].append(link)
  })
}

function injectQuickLinks() {
  const observerOptions = {
    childList: true,
    subtree: true,
  };

  const observer = new MutationObserver(logChanges)
  observer.observe(document.body, observerOptions);
}

function logChanges(records, observer) {
  for (const record of records) {
    for (const addedNode of record.addedNodes) {
      if (addedNode.id == "actions") {
        observer.disconnect();
        _injectQuickLinks();
      }
    }
  }
}

UGOpp.injectQuickLinks = injectQuickLinks;

injectQuickLinks();

// vim: ts=2 sts=2 sw=2