// ===============================
// MAPPA GLOBALE — stile Google Photos Web
// ===============================

window.globalMap = null;
window.globalMarkers = null;

document.addEventListener("DOMContentLoaded", () => {
  const openBtn = document.getElementById("openMapBtn");
  if (!openBtn) return;

  openBtn.addEventListener("click", openGlobalMap);

  const RADIUS_PX = 50;
  const DISABLE_CLUSTER_AT_ZOOM = 18;
  const OPEN_STRIP_CHILDREN_MAX = 20;

  // ===============================
  // APRI / CHIUDI MAPPA
  // ===============================
  async function openGlobalMap() {
    const mapDiv = document.getElementById("globalMap");
    const gallery = document.getElementById("gallery");
    if (!mapDiv) return;

    const isOpen = mapDiv.classList.contains("open");

    if (isOpen) {
      mapDiv.classList.remove("open");
      gallery?.classList.remove("hidden");
      window.closeBottomSheet?.();
      return;
    }

    mapDiv.classList.add("open");
    gallery?.classList.add("hidden");

    await new Promise(r => requestAnimationFrame(r));

    if (!window.globalMap) initMap();
    else window.globalMap.invalidateSize();

    redrawPhotoMarkers();
  }

  // ===============================
  // INIZIALIZZA MAPPA
  // ===============================
  function initMap() {
    console.log("Inizializzo mappa Leaflet + MarkerCluster…");

    window.globalMap = L.map("globalMap", {
      zoomControl: true,
      attributionControl: true
    }).setView([42.5, 12.5], 6);

    L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
      maxZoom: 19
    }).addTo(window.globalMap);

    window.globalMarkers = L.markerClusterGroup({
      showCoverageOnHover: false,
      spiderfyOnMaxZoom: true,
      disableClusteringAtZoom: DISABLE_CLUSTER_AT_ZOOM,
      iconCreateFunction: clusterIconRenderer
    });

    window.globalMarkers.on("clusterclick", onClusterClick);

    window.globalMap.addLayer(window.globalMarkers);
  }

  // ===============================
  // RENDER CLUSTER
  // ===============================
  function clusterIconRenderer(cluster) {
    const count = cluster.getChildCount();
    const size = Math.min(92, Math.round(28 + Math.sqrt(count) * 6));
    const cls = count > 200 ? "cluster-xl" :
                count > 50  ? "cluster-lg" :
                count > 10  ? "cluster-md" : "cluster-sm";

    const children = cluster.getAllChildMarkers().slice(0, 4);
    const thumbs = children
      .map(m => m.__photo?.thub2 || m.__photo?.thub1)
      .filter(Boolean)
      .map(t => toAbsoluteUrl(t, children[0].__photo.name, "thumbs", children[0].__photo.cartella));

    const collage = thumbs.length
      ? `<div class="cluster-collage">${thumbs.map((t,i)=>`<div class="c${i}"><img src="${t}"></div>`).join("")}</div>`
      : "";

    return L.divIcon({
      html: `
        <div class="gp-cluster ${cls}" style="width:${size}px;height:${size}px;">
          ${collage}
          <div class="gp-count"><span>${count}</span></div>
        </div>`,
      className: "marker-cluster-wrapper",
      iconSize: L.point(size, size)
    });
  }

  // ===============================
  // CLICK SU CLUSTER
  // ===============================
  function onClusterClick(a) {
    const markers = a.layer.getAllChildMarkers();
    const count = markers.length;

    if (count <= OPEN_STRIP_CHILDREN_MAX ||
        window.globalMap.getZoom() >= DISABLE_CLUSTER_AT_ZOOM - 1) {

      const photos = markers.map(m => m.__photo).filter(Boolean);

      if (photos.length > 1) window.openBottomSheet?.(photos);
      else if (photos.length === 1) openPhotoModal(photos[0]);

    } else {
      window.globalMap.fitBounds(a.layer.getBounds(), {
        padding: [60, 60],
        maxZoom: DISABLE_CLUSTER_AT_ZOOM,
        animate: true
      });
    }
  }

  // ===============================
  // ICONA FOTO
  // ===============================
  function createPhotoIcon(photo) {
    const thumb = toAbsoluteUrl(
      photo.thub2 || photo.thub1,
      photo.name,
      "thumbs",
      photo.cartella
    );

    return L.icon({
      iconUrl: thumb,
      iconSize: [56, 56],
      iconAnchor: [28, 28],
      className: "photo-marker"
    });
  }

  // ===============================
  // APRI MODAL FOTO
  // ===============================
  function openPhotoModal(photo) {
    const thumb = toAbsoluteUrl(
      photo.thub2 || photo.thub1 || photo.path,
      photo.name,
      "thumbs",
      photo.cartella
    );

    const original = toAbsoluteUrl(
      photo.path,
      photo.name,
      "original",
      photo.cartella
    );

    window.closeBottomSheet?.();
    window.openModal?.(original, thumb, photo);
  }

  // ===============================
  // REDRAW MARKERS
  // ===============================
  function redrawPhotoMarkers() {
    if (!window.globalMarkers) return;

    window.globalMarkers.clearLayers();

    const photos = getLocalPhotos();
    photos.forEach(photo => {
      const lat = +photo?.gps?.lat;
      const lng = +photo?.gps?.lng;
      if (!lat || !lng) return;

      const marker = L.marker([lat, lng], {
        icon: createPhotoIcon(photo),
        title: photo.name || ""
      });

      marker.__photo = photo;

      marker.on("click", () => openPhotoModal(photo));

      window.globalMarkers.addLayer(marker);
    });
  }

  // ===============================
  // AGGANCIA REFRESH GALLERY
  // ===============================
  const originalRefresh = window.refreshGallery;
  window.refreshGallery = function (...args) {
    originalRefresh?.apply(this, args);
    redrawPhotoMarkers();
  };
});