// ============================================================
// Adventskalender 2025 – Hintergrund- & Favicon-Wechsel nach Tag
// ============================================================

(function () {
  const pathYear = window.location.pathname.match(/(\d{4})/);
  const YEAR = pathYear ? parseInt(pathYear[1], 10) : new Date().getFullYear();
  const DEV_MODE = window.location.search.includes("dev");
  const STORAGE_BASE = `bratonien_${YEAR}_lock`;

  function getSimulatedDay() {
    if (!DEV_MODE) return null;
    const val = localStorage.getItem(`${STORAGE_BASE}_simday`);
    return val ? parseInt(val, 10) : null;
  }

  const now = new Date();
  let dayToShow = now.getMonth() === 11 ? now.getDate() : 0;
  const sim = getSimulatedDay();
  if (DEV_MODE && sim) dayToShow = sim;

  let padded = "Basisbild";
  if (dayToShow >= 1 && dayToShow <= 24) {
    padded = String(dayToShow).padStart(2, "0");
  }

  // Basename ohne Extension
  const filename = `${padded}`;
  const basePath = "assets/images/";

  // === Funktion zum Setzen des Favicons (.webp reicht völlig aus) ===
  function setFavicon(path) {
    let link = document.querySelector('link[rel="icon"]');
    if (!link) {
      link = document.createElement("link");
      link.rel = "icon";
      link.type = "image/png";
      document.head.appendChild(link);
    }
    link.href = `${basePath}${filename}.webp`;
  }

  window.addEventListener("DOMContentLoaded", () => {
    const picture = document.querySelector(".kalenderbild picture");
    const img = picture?.querySelector("img");
    const sources = picture?.querySelectorAll("source");

    if (!picture || !img || !sources) return;

    // Durch alle <source> durchgehen und neuen srcset setzen
    sources.forEach(source => {
      const type = source.getAttribute("type");
      const format = type?.split("/")[1]; // "avif" oder "webp"
      if (!format) return;

      const newSrcset = [
        `assets/images/420/${format}/${filename}.${format} 420w`,
        `assets/images/768/${format}/${filename}.${format} 768w`,
        `assets/images/1024/${format}/${filename}.${format} 1024w`,
        `assets/images/1280/${format}/${filename}.${format} 1280w`,
        `assets/images/1600/${format}/${filename}.${format} 1600w`,
        `assets/images/1920/${format}/${filename}.${format} 1920w`,
        `assets/images/2560/${format}/${filename}.${format} 2560w`,
        `assets/images/3840/${format}/${filename}.${format} 3840w`,
      ].join(", ");
      source.setAttribute("srcset", newSrcset);
    });

    // JPEG für <img>-Fallback
    img.src = `assets/images/1920/jpeg/${filename}.jpg`;

    console.log(`[Bratonien] Kalenderbild gesetzt für Tag ${filename}`);
    setFavicon(`${basePath}${filename}.webp`);
    console.log(`[Bratonien] Favicon gesetzt für Tag ${filename}`);
  });
})();