// ===============================
// GALLERY — con SYNC INCREMENTALE + REFRESH DA .ENV
// ===============================

let currentUser = null;
let refreshSeconds = 30;

// ===============================
// 3. ORDINAMENTO
// ===============================
function sortByDate(photos, direction = "desc") {
  return photos.slice().sort((a, b) => {
    const da = a?.taken_at ? new Date(a.taken_at) : 0;
    const db = b?.taken_at ? new Date(b.taken_at) : 0;
    return direction === "asc" ? (da - db) : (db - da);
  });
}

// ===============================
// 4. FILTRI
// ===============================
function applyFilters(photos) {
  if (!window.currentFilter) return photos;

  switch (window.currentFilter) {
    case "folder":
      return photos.filter(p => p.cartella);
    case "location":
      return photos.filter(p => p.lat && p.lon);
    case "type":
      return photos.filter(p => p?.mime_type?.startsWith("image/"));
    default:
      return photos;
  }
}

// ===============================
// 5. RAGGRUPPAMENTO
// ===============================
function groupByDate(photos, mode = "auto") {
  const sections = [];
  const now = new Date();

  function getLabel(photo) {
    const date = photo?.taken_at ? new Date(photo.taken_at) : null;
    if (!date || isNaN(+date)) return "Senza data";

    const diffDays = Math.floor((now - date) / (1000 * 60 * 60 * 24));

    if (mode === "day")   return formatDay(date);
    if (mode === "month") return formatMonth(date);
    if (mode === "year")  return date.getFullYear().toString();

    if (diffDays === 0)  return "Oggi";
    if (diffDays === 1)  return "Ieri";
    if (diffDays <= 7)   return "Questa settimana";
    if (diffDays <= 14)  return "La settimana scorsa";
    if (diffDays <= 30)  return "Questo mese";
    if (diffDays <= 60)  return "Mese scorso";

    if (date.getFullYear() === now.getFullYear()) return formatMonth(date);
    return date.getFullYear().toString();
  }

  photos.forEach(photo => {
    const label = getLabel(photo);
    let section = sections.find(s => s.label === label);
    if (!section) {
      section = { label, photos: [] };
      sections.push(section);
    }
    section.photos.push(photo);
  });

  return sections;
}

// ===============================
// 6. FORMATTATORI
// ===============================
function formatDay(date) {
  return date.toLocaleDateString("it-IT", { weekday: "long", day: "numeric", month: "long" });
}
function formatMonth(date) {
  return date.toLocaleDateString("it-IT", { month: "long", year: "numeric" });
}

// ===============================
// 7. RENDER GALLERY
// ===============================
function renderGallery(sections) {
  const gallery = document.getElementById("gallery");
  if (!gallery) return;
  gallery.innerHTML = "";

  sections.forEach(section => {
    const h = document.createElement("h2");
    h.className = "gallery-section-title";
    h.textContent = section.label;
    gallery.appendChild(h);

    const container = document.createElement("div");
    container.className = "gallery-section";

    section.photos.forEach((photo, idx) => {
      const thumbDiv = document.createElement("div");
      thumbDiv.className = "thumb";
      thumbDiv.id = "photo_" + photo.id;

      let th1 = photo?.thub1;
      let th2 = photo?.thub2 || photo?.thub1;
      let original = photo?.path;

      const img = document.createElement("img");
      img.src = th1 || th2 || original || "";
      img.alt = photo?.name || "";
      img.loading = "lazy";
      thumbDiv.appendChild(img);

      if (photo?.mime_type?.startsWith("video/")) {
        const play = document.createElement("div");
        play.className = "play-icon";
        play.textContent = "▶";
        thumbDiv.appendChild(play);
      }

      thumbDiv.addEventListener("click", () => {
        window.closeBottomSheet?.();

        if (typeof window.openModalFromList === "function") {
          window.openModalFromList(section.photos, idx);
        } else {
          window.openModal?.(original, th2, photo);
        }
      });

      container.appendChild(thumbDiv);
    });

    gallery.appendChild(container);
  });
}

// ===============================
// 8. REFRESH GALLERY
// ===============================
function refreshGallery() {
  const photos = getLocalPhotos();   // 🔥 USO DELLO STATO UNICO
  console.log("[refreshGallery] numero foto:", photos.length);

  const filtered = applyFilters(photos);
  const sorted = sortByDate(filtered, "desc");
  const sections = groupByDate(sorted, "auto");
  renderGallery(sections);
}

// ===============================
// 9. INIZIALIZZAZIONE GALLERY
// ===============================
async function initGallery() {
  console.log("=== INIT GALLERY ===");

  console.log("[initGallery] Chiamo /config...");
  const cfg = await fetch("/config").then(r => r.json());
  console.log("[initGallery] /config RISPOSTA:", cfg);

  window.PATH_FULL = cfg.pathFull;
  currentUser = cfg?.user || "Common";
  refreshSeconds = cfg.galleryRefreshSeconds || 30;

  console.log("[initGallery] currentUser =", currentUser);
  console.log("[initGallery] refreshSeconds =", refreshSeconds);

  console.log("[initGallery] Avvio incrementalSync() iniziale...");
  await incrementalSync();
  console.log("[initGallery] incrementalSync() iniziale COMPLETATO");

  // ===============================================
  // 🛟 POLLING DI SICUREZZA (configurabile da .env)
  // ===============================================
  if (refreshSeconds > 0) {
    console.log(`[initGallery] Polling attivo ogni ${refreshSeconds} secondi...`);

    setInterval(async () => {
      console.log(">>> TIMER: chiamata incrementalSync()");
      console.log(">>> lastSync attuale =", getLastSync());
      await incrementalSync();
      console.log(">>> incrementalSync() COMPLETATO (timer)");
    }, refreshSeconds * 1000);

  } else {
    console.log("[initGallery] Polling disattivato (refreshSeconds = 0)");
  }

}

window.addEventListener("DOMContentLoaded", initGallery);

// EXPORT
window.sortByDate = sortByDate;
window.applyFilters = applyFilters;
window.groupByDate = groupByDate;
window.renderGallery = renderGallery;
window.refreshGallery = refreshGallery;