// public/js/mapGlobal.js
// ===============================
// MAPPA GLOBALE
// Controller generico Leaflet + MarkerCluster
// ===============================

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

document.addEventListener("DOMContentLoaded", () => {
  "use strict";

  const openBtn = document.getElementById("openMapBtn");

  if (!openBtn) {
    console.error("[mapGlobal] Pulsante #openMapBtn non trovato");

    return;
  }

  const DISABLE_CLUSTER_AT_ZOOM = 18;
  const OPEN_STRIP_CHILDREN_MAX = 20;

  let mapInitializationPromise = null;

  openBtn.addEventListener("click", openGlobalMap);

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

    const gallery = document.getElementById("gallery");

    if (!mapDiv) {
      console.error("[mapGlobal] Contenitore #globalMap non trovato");

      return;
    }

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

    // Chiude la mappa.
    if (isOpen) {
      mapDiv.classList.remove("open");
      gallery?.classList.remove("hidden");

      window.closeBottomSheet?.();
      window.clearActivityMapLayers?.();

      return;
    }

    // Apre la mappa.
    mapDiv.classList.add("open");
    gallery?.classList.add("hidden");

    // Attende che il browser renda visibile il contenitore.
    await new Promise((resolve) => {
      requestAnimationFrame(resolve);
    });

    try {
      if (!window.globalMap) {
        /*
         * Impedisce due inizializzazioni contemporanee
         * in caso di clic ripetuti.
         */
        if (!mapInitializationPromise) {
          mapInitializationPromise = initGlobalMap();
        }

        await mapInitializationPromise;
      } else {
        window.globalMap.invalidateSize();
      }

      await window.redrawGlobalMap?.();
    } catch (error) {
      console.error("[mapGlobal] Errore apertura mappa:", error);

      mapInitializationPromise = null;
    }
  }

  window.openGlobalMap = openGlobalMap;

  // ===============================
  // INIZIALIZZA MAPPA
  // ===============================
  async function initGlobalMap() {
    console.log("[mapGlobal] Inizializzo Leaflet + MarkerCluster");

    if (typeof window.L === "undefined") {
      throw new Error("Leaflet non è stato caricato");
    }

    if (typeof window.L.markerClusterGroup !== "function") {
      throw new Error("Leaflet MarkerCluster non è stato caricato");
    }

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

    window.MapEngine?.init(window.globalMap);

    // ===============================
    // BASEMAP
    // ===============================
    if (
      window.MapBaseLayers &&
      typeof window.MapBaseLayers.initialize === "function"
    ) {
      /*
       * Attende che config.js abbia recuperato
       * il token Mapbox da /config.
       */
      await window.MapBaseLayers.initialize(window.globalMap);
    } else {
      console.error(
        "[mapGlobal] MapBaseLayers non disponibile. " +
          "Uso OpenStreetMap come fallback.",
      );

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

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

    window.MapEngine?.init?.(window.globalMap, window.globalMarkers);

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

    window.globalMap.addLayer(window.globalMarkers);

    window.MapEngine?.init(window.globalMap, window.globalMarkers);

    // ===============================
    // AGGIORNAMENTO BOTTOM SHEET
    // ===============================
    window.globalMap.on("moveend", refreshOpenBottomSheet);

    window.globalMap.on("moveend", () => {
      if (window.state?.mode === "photos") {
        window.renderPhotoMapLayer?.();
      }
    });

    /*
     * Leaflet viene creato mentre il contenitore
     * è appena diventato visibile. Un secondo
     * invalidateSize evita layout incompleti.
     */
    await new Promise((resolve) => {
      requestAnimationFrame(resolve);
    });

    window.globalMap.invalidateSize();

    console.log("[mapGlobal] Mappa inizializzata", {
      currentStyle: window.MapBaseLayers?.getCurrentStyle?.() || "fallback-osm",

      styles: window.MapBaseLayers?.getAvailableStyles?.() || [],
    });

    return window.globalMap;
  }

  // ===============================
  // AGGIORNA BOTTOM SHEET DOPO MOVE
  // ===============================
  function refreshOpenBottomSheet() {
    const bottomSheet = document.getElementById("bottomSheet");

    if (!bottomSheet?.classList.contains("open")) {
      return;
    }

    if (!window.globalMap || !window.globalMarkers) {
      return;
    }

    const bounds = window.globalMap.getBounds();

    const items = [];

    window.globalMarkers.eachLayer((marker) => {
      if (!marker.__item) {
        return;
      }

      if (typeof marker.getLatLng !== "function") {
        return;
      }

      if (bounds.contains(marker.getLatLng())) {
        items.push(marker.__item);
      }
    });

    if (items.length > 1) {
      window.refreshBottomSheet?.(items);
    }
  }

  // ===============================
  // CLUSTER ICON GENERICO
  // ===============================
  function clusterIconRenderer(cluster) {
    if (
      window.state?.mode === "photos" &&
      typeof window.createPhotoClusterIcon === "function"
    ) {
      return window.createPhotoClusterIcon(cluster);
    }

    if (
      window.state?.mode === "activities" &&
      typeof window.createActivityClusterIcon === "function"
    ) {
      return window.createActivityClusterIcon(cluster);
    }

    const count = cluster.getChildCount();

    return L.divIcon({
      html: `<div class="activity-cluster">` + `${count}` + `</div>`,

      className: "marker-cluster-wrapper",

      iconSize: L.point(48, 48),
    });
  }

  // ===============================
  // CLICK SU CLUSTER
  // ===============================
  function onClusterClick(event) {
    if (!event?.layer || !window.globalMap) {
      return;
    }

    const markers = event.layer.getAllChildMarkers();

    const items = markers.map((marker) => marker.__item).filter(Boolean);

    const count = markers.length;

    if (
      count <= OPEN_STRIP_CHILDREN_MAX ||
      window.globalMap.getZoom() >= DISABLE_CLUSTER_AT_ZOOM - 1
    ) {
      if (items.length > 1) {
        window.currentOpenCluster = event.layer;

        window.openBottomSheet?.(items);
      } else if (items.length === 1) {
        window.openMapItem?.(items[0]);
      }

      return;
    }

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

  // ===============================
  // APRI ELEMENTO DALLA MAPPA
  // ===============================
  window.openMapItem = function (item) {
    if (!item) {
      return;
    }

    window.closeBottomSheet?.();

    if (window.state?.mode === "photos") {
      window.openPhotoMapItem?.(item);
    } else {
      window.openActivityModal?.(item);
    }
  };

  // ===============================
  // RIDISEGNA MARKER E ATTIVITÀ
  // ===============================
  window.redrawGlobalMap = async function () {
    if (!window.globalMap || !window.globalMarkers) {
      return;
    }

    window.globalMarkers.clearLayers();

    if (typeof window.clearActivityMapLayers === "function") {
      window.clearActivityMapLayers();
    }

    if (window.state?.mode === "photos") {
      window.hideActivityRoutesToggle?.();

      if (typeof window.renderPhotoMapLayer === "function") {
        await window.renderPhotoMapLayer();
      }
    } else {
      if (typeof window.renderActivityMapLayer === "function") {
        await window.renderActivityMapLayer();
      }
    }
  };

  // ===============================
  // AGGANCIA REFRESH GALLERY
  // ===============================
  const originalRefresh = window.refreshGallery;

  if (typeof originalRefresh === "function") {
    window.refreshGallery = function (...args) {
      const result = originalRefresh.apply(this, args);

      // I dati sono cambiati: invalida l'indice spaziale
      window.MapSpatialIndex?.clear?.();

      const mapDiv = document.getElementById("globalMap");

      if (mapDiv?.classList.contains("open")) {
        Promise.resolve(window.redrawGlobalMap?.()).catch((error) => {
          console.error("[mapGlobal] Errore redraw dopo refresh:", error);
        });
      }

      return result;
    };
  } else {
    console.warn(
      "[mapGlobal] refreshGallery non disponibile " +
        "durante l'inizializzazione",
    );
  }
});