// ===============================
// ORDINAMENTO
// ===============================
function sortByDate(photos, direction = "desc") {
  return photos.slice().sort((a, b) => {
    const da = new Date(a.taken_at);
    const db = new Date(b.taken_at);

    return direction === "asc" ? da - db : db - da;
  });
}

// ===============================
// FILTRI (base, estendibili)
// ===============================
function applyFilters(photos) {
  if (!currentFilter) return photos;

  switch (currentFilter) {
    case "folder":
      return photos.filter(p => p.folder); // da migliorare
    case "location":
      return photos.filter(p => p.gps && p.gps.lat);
    case "type":
      return photos.filter(p => p.mime_type.startsWith("image/"));
    default:
      return photos;
  }
}

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

  function getLabel(photo) {
    const date = new Date(photo.taken_at);
    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();

    // modalità AUTO (Google Photos)
    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";

    // stesso anno → raggruppa per mese
    if (date.getFullYear() === now.getFullYear()) {
      return formatMonth(date);
    }

    // anni precedenti → raggruppa per anno
    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;
}

// ===============================
// 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"
  });
}

// ===============================
// RENDER GALLERIA A SEZIONI
// ===============================
function renderGallery(sections) {
  const gallery = document.getElementById("gallery");
  gallery.innerHTML = "";

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

    // CONTENITORE DELLE FOTO
    const container = document.createElement("div");
    container.className = "gallery-section";

    section.photos.forEach(photo => {
      const thumbDiv = document.createElement("div");
      thumbDiv.className = "thumb";

      const img = document.createElement("img");
      img.src = `https://prova.patachina.it/${photo.thub1}`;
      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);
      }

      const preview = photo.thub2
        ? `https://prova.patachina.it/${photo.thub2}`
        : `https://prova.patachina.it/${photo.thub1}`;

      thumbDiv.addEventListener("click", () => {
        openModal(
          `https://prova.patachina.it/${photo.path}`,
          preview,
          photo
        );
      });

      container.appendChild(thumbDiv);
    });

    gallery.appendChild(container);
  });
}