nodeMap/utils/initializeMap.js

// utils/initializeMap.js
import L from "leaflet";
import "leaflet-contextmenu";
import "leaflet/dist/leaflet.css";
import "leaflet-contextmenu/dist/leaflet.contextmenu.css";
import "overlapping-marker-spiderfier-leaflet";

export const initializeMap = (
  mapContainer,
  setMenuItemAdded,
  addItemsToMapContextMenu,
  hasRights,
  setPolylineEventsDisabled,
  logError = false
) => {
  // basePath wird aus config.json geladen (siehe unten)
  let basePath = undefined;

  if (
    !mapContainer ||
    !(mapContainer instanceof HTMLElement) ||
    !document.body.contains(mapContainer)
  ) {
    if (logError) {
      console.error("❌ Fehler: map container ist nicht definiert oder nicht im DOM.");
    }
    return null;
  }

  // Robuste Entfernung einer evtl. alten Leaflet-Instanz und Reset des DOM-Elements
  if (mapContainer) {
    if (mapContainer._leaflet_id) {
      try {
        // Leaflet-Instanz entfernen
        if (mapContainer._leaflet_map && typeof mapContainer._leaflet_map.remove === "function") {
          mapContainer._leaflet_map.remove();
        }
        // Leaflet 1.7+ speichert die Map-Instanz in L.Map._instances
        if (L && L.Map && L.Map._instances && mapContainer._leaflet_id) {
          delete L.Map._instances[mapContainer._leaflet_id];
        }
        // Auch in L.DomUtil._store ggf. entfernen
        if (L && L.DomUtil && L.DomUtil._store && mapContainer._leaflet_id) {
          delete L.DomUtil._store[mapContainer._leaflet_id];
        }
        // _leaflet_id vom DOM-Element entfernen
        delete mapContainer._leaflet_id;
        // Alle weiteren _leaflet-Properties entfernen
        for (const key in mapContainer) {
          if (key.startsWith("_leaflet")) {
            try {
              delete mapContainer[key];
            } catch (e) {}
          }
        }
      } catch (e) {
        console.warn("Fehler beim Entfernen der alten Leaflet-Instanz:", e);
      }
    }
    // Container leeren (immer, auch wenn keine Map-Instanz)
    mapContainer.innerHTML = "";
  }

  // --- CONFIG LOADING ---
  let config = null;
  let tileLayerUrl = "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png";
  let mapCenter = [53.111111, 8.4625];
  let mapZoom = 12;
  let minZoom = 5;
  let maxZoom = 20;
  try {
    if (window && window.__leafletConfig) {
      config = window.__leafletConfig;
    } else {
      const xhr = new XMLHttpRequest();
      xhr.open("GET", "/config.json", false); // false = synchronous
      xhr.send(null);
      if (xhr.status === 200) {
        config = JSON.parse(xhr.responseText);
        window.__leafletConfig = config;
      }
    }
    if (config) {
      // basePath aus config.json
      if (typeof config.basePath === "string") {
        basePath = config.basePath;
      }
      // Tile source
      if (config.tileSources && config.active && config.tileSources[config.active]) {
        const tileSource = config.tileSources[config.active];
        tileLayerUrl = tileSource.url || tileLayerUrl;
        // Dynamische URL für Server-Tiles
        if (tileLayerUrl.startsWith("/tiles") || tileLayerUrl.startsWith("tiles")) {
          tileLayerUrl = `${window.location.origin.replace(/\/$/, "")}${
            tileLayerUrl.startsWith("/") ? tileLayerUrl : "/" + tileLayerUrl
          }`;
        }
        minZoom = tileSource.minZoom ?? minZoom;
        maxZoom = tileSource.maxZoom ?? maxZoom;
      }
      // Center
      if (Array.isArray(config.center)) {
        mapCenter = config.center;
      }
      // Zoom (optional, fallback to 12)
      if (typeof config.zoom === "number") {
        mapZoom = config.zoom;
      }
      // minZoom/maxZoom global fallback
      if (typeof config.minZoom === "number") {
        minZoom = config.minZoom;
      }
      if (typeof config.maxZoom === "number") {
        maxZoom = config.maxZoom;
      }
    }
  } catch (e) {
    // Fallback bleibt OSM und Defaults
  }

  let initMap;
  try {
    initMap = L.map(mapContainer, {
      center: mapCenter,
      zoom: mapZoom,
      minZoom: minZoom,
      maxZoom: maxZoom,
      zoomControl: false,
      dragging: true,
      contextmenu: true,
      layers: [],
    });
  } catch (e) {
    if (e.message && e.message.includes("Map container is already initialized")) {
      console.warn(
        "Leaflet: Map container is already initialized. Map wird nicht erneut initialisiert."
      );
      return;
    }
    throw e;
  }

  initMap.dragging.enable();

  L.tileLayer(tileLayerUrl, {
    attribution: "© OpenStreetMap contributors",
    tileSize: 256,
    minZoom: minZoom,
    maxZoom: maxZoom,
    noWrap: true,
    errorTileUrl: "/img/empty-tile.png", // Optional
  }).addTo(initMap);

  const overlappingMarkerSpiderfier = new OverlappingMarkerSpiderfier(initMap, {
    nearbyDistance: 20,
  });

  if (typeof addItemsToMapContextMenu === "function") {
    addItemsToMapContextMenu(initMap, setMenuItemAdded, setPolylineEventsDisabled);
  }
  return { map: initMap, oms: overlappingMarkerSpiderfier };
};