/*
  Include calendar | Chaostreff Backnang | @paddy
  Modernization by @kleinesfilmroellchen
*/

const uriRegex =
  /(https?:\/\/([-\w\.]+)+(:\d+)?(\/([\w\/\-_\.\:]*(\?\S+)?)?)?)/gi;

const timeFormat = new Intl.DateTimeFormat("de-DE", {
  dateStyle: "full",
  timeStyle: "short",
  hourCycle: "h23",
});

export default function hackcal(e, p = 1) {
  if (!document.getElementById("dbkcalendar")) return;

  const calendarDate = document.getElementById("calendar-date");
  const calendarEntry = document.getElementById("calendar-entry");

  const calendarParent = document.getElementById("dbkcalendar");
  calendarParent.innerHTML = "";

  const calUri = `https://hackcal.ctbk.de/?period=${p}`;
  fetch(calUri)
    .then((res) => res.json())
    .then((data) => {
      Object.keys(data).forEach(function (date) {
        Object.keys(data[date]).forEach(function (uid) {
          const event = data[date][uid];

          const startTime = event.dtstart;
          const day = new Date(startTime);
          console.log(day);

          const dateItem = calendarDate.content.cloneNode(true);
          const timeElement = dateItem.querySelector("time");
          timeElement.innerText = timeFormat.format(day);
          timeElement.dateTime = date;
          calendarParent.appendChild(dateItem);

          const entryItem = calendarEntry.content.cloneNode(true);
          entryItem.querySelector(".calendar-entry").dataset.uid = uid;

          // use description as link on summary if it's a valid URL
          const summaryItem = entryItem.querySelector(".summary");
          const possibleUri = uriRegex.exec(event.description)?.[0];
          const cleanedDescription = event.description.replaceAll(uriRegex, "");
          try {
            const descriptionUri = new URL(possibleUri);
            const descriptionLink = document.createElement("a");
            descriptionLink.href = descriptionUri;
            descriptionLink.target = "_blank";
            descriptionLink.innerText = event.summary;
            summaryItem.appendChild(descriptionLink);
          } catch (e) {
            summaryItem.innerText = event.summary;
          }
          entryItem.querySelector(".description").innerText =
            cleanedDescription;

          // self-link location if it's a valid URL
          const locationItem = entryItem.querySelector(".location");
          try {
            const locationUri = new URL(event.location);
            const locationLink = document.createElement("a");
            locationLink.href = locationUri;
            locationLink.target = "_blank";
            locationLink.innerText = event.location;
            locationItem.appendChild(locationLink);
          } catch (e) {
            locationItem.innerText = event.location;
          }

          const categoriesParent = entryItem.querySelector(".categories");
          for (const category of event.categories?.split(",") || []) {
            const categoryItem = document.createElement("em");
            categoryItem.innerText = category;
            categoriesParent.appendChild(categoryItem);
          }

          calendarParent.appendChild(entryItem);
        });
      });
    });
}