import { useEffect, useRef, useState } from "react";
import L from "leaflet";
import "leaflet/dist/leaflet.css";
import "leaflet-contextmenu/dist/leaflet.contextmenu.css";
import "leaflet-contextmenu";

const MapComponent = ({ locations, onAddLocation, onLocationUpdate, dataStatic, mapData }) => {
  const [map, setMap] = useState(null);
  const mapRef = useRef(null);
  const [online, setOnline] = useState(navigator.onLine);
  const offlineTileLayer = "../TileMap/mapTiles/{z}/{x}/{y}.png";
  const onlineTileLayer = "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png";

  // Funktionen zur Überwachung der Internetverbindung
  const checkInternet = () => {
    console.log("Checking internet connectivity...");
    fetch("https://tile.openstreetmap.org/1/1/1.png", { method: "HEAD" })
      .then(response => setOnline(response.ok))
      .catch(() => setOnline(false));
  };

  // Initialize map
  useEffect(() => {
    if (mapRef.current && !map) {
      console.log("Initializing map...");
      const initializedMap = L.map(mapRef.current, {
        center: [53.111111, 8.4625],
        zoom: 10,
        contextmenu: true,
        contextmenuWidth: 140,
        contextmenuItems: [
          { text: "Station hinzufügen", callback: showAddStationPopup },
          { text: "Station öffnen (Tab)", icon: "img/screen_new.png", callback: newLink },
          { text: "Station öffnen", icon: "img/screen_same.png", callback: sameLink },
          "-", // Divider
          { text: "Reinzoomen", callback: (e) => zoomIn(e, initializedMap) },
          { text: "Rauszoomen", callback: (e) => zoomOut(e, initializedMap) },
          { text: "Hier zentrieren", callback: (e) => centerMap(e, initializedMap) },
          "-", // Divider
          { text: "Koordinaten", icon: "img/not_listed_location.png", callback: showCoordinates },
          { text: "Get Data to Console", icon: "img/not_listed_location.png", callback: showData }
        ]
      });

      // Adding initial tile layer
      const tileLayer = L.tileLayer(online ? onlineTileLayer : offlineTileLayer, {
        attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
        minZoom: 7,
        maxZoom: 19
      });

      tileLayer.addTo(initializedMap);
      setMap(initializedMap);

      // Cleanup function
      return () => {
        initializedMap.remove();
      };
    }
  }, [mapRef, online]); // React only on online changes for initialization

  // Handle online/offline status
  useEffect(() => {
    window.addEventListener("online", checkInternet);
    window.addEventListener("offline", checkInternet);
    return () => {
      window.removeEventListener("online", checkInternet);
      window.removeEventListener("offline", checkInternet);
    };
  }, []);

  // Update map layers based on online status
  useEffect(() => {
    if (map) {
      const newLayer = L.tileLayer(online ? onlineTileLayer : offlineTileLayer, {
        minZoom: 7,
        maxZoom: online ? 19 : 14,
        attribution: 'Map data © <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
      });

      map.eachLayer(layer => {
        if (layer instanceof L.TileLayer) {
          map.removeLayer(layer);
        }
      });

      newLayer.addTo(map);
    }
  }, [online, map]);

  // Marker handling
  useEffect(() => {
    // Remove old markers
    if (map) {
      map.eachLayer(layer => {
        if (layer instanceof L.Marker) {
          map.removeLayer(layer);
        }
      });

      // Add new markers
      locations.forEach(location => {
        const { latitude, longitude } = parsePoint(location.position);
        const marker = L.marker([latitude, longitude], {
          icon: L.icon({
            iconUrl: "/location.svg",
            iconSize: [34, 34],
            iconAnchor: [17, 34],
            popupAnchor: [0, -34]
          }),
          draggable: true,
          id: location.idPoi
        });

        marker.bindPopup(`<b>${location.description || "Unbekannt"}</b><br>Type: ${location.idPoiTyp || "N/A"}<br>Lat: ${latitude.toFixed(5)}, Lng: ${longitude.toFixed(5)}`);

        marker.on("dragend", function (e) {
          const newLat = e.target.getLatLng().lat;
          const newLng = e.target.getLatLng().lng;
          const markerId = e.target.options.id;
          updateLocationInDatabase(markerId, newLat, newLng).then(() => {
            onLocationUpdate(markerId, newLat, newLng);
          });
        });

        marker.addTo(map);
      });
    }
  }, [map, locations, onLocationUpdate]);

  //------------------------------------------
  function parsePoint(pointString) {
    const match = pointString.match(
      /POINT\s*\((\d+(\.\d+)?)\s+(\d+(\.\d+)?)\)/
    );
    if (match) {
      return {
        longitude: parseFloat(match[1]),
        latitude: parseFloat(match[3]), // Achtung: Index 3 für die zweite Koordinate, wegen der Gruppe (\.\d+)?
      };
    } else {
      // Handle the error or return a default/fallback value
      console.error("Invalid POINT format:", pointString);
      return null; // Oder eine sinnvolle Standardantwort
    }
  }
//----------------------------------
  const centerMap = (e) => {
    if (!map) {
      console.error("Die Karte wurde noch nicht initialisiert.");
      return;
    }
    if (!e || !e.latlng) {
      console.error("Fehlerhafte Event-Daten: ", e);
      return;
    }
    console.log("Zentrierung auf: ", e.latlng);
    map.panTo(e.latlng);
  };

  //-----Kontextmenu----------------
  const newLink = (e) => {
    try {
      if (!e.relatedTarget || !e.relatedTarget.options) {
        throw new Error("relatedTarget or options not defined");
      }
      alert("Neues Fenster: " + e.relatedTarget.options.test);
      window
        .open(`../devices/${e.relatedTarget.options.test}`, "_blank")
        .focus();
    } catch (error) {
      console.error("Failed in newLink function:", error);
    }
  };

  const sameLink = (e) => {
    alert(e.relatedTarget.options.test);
    window
      .open("../devices/" + e.relatedTarget.options.test, "_parent")
      .focus();
  };
  const zoomIn = (e) => {
    if (!map) {
      console.error("Karte ist noch nicht initialisiert.");
      return;
    }
    map.flyTo(e.latlng, map.getZoom() + 1);
  };

  const zoomOut = (e) => {
    if (!map) {
      console.error("Karte ist noch nicht initialisiert.");
      return;
    }
    // Annahme: Du willst beim Rauszoomen die aktuelle Position halten
    // und nur den Zoom-Level ändern. Hier reduzieren wir den Zoom-Level um 1.
    const currentZoom = map.getZoom();
    map.flyTo(e.latlng, map.getZoom() - 1);
  };
  


  const showCoordinates = (e) => {
    alert("Breitengrad: " + e.latlng.lat + "\nLängengrad: " + e.latlng.lng);
  };
  const showData = (e) => {
    console.log(e);
  };
  const showTalas = (e) => {
    map.addLayer(TALAS);
    loadData();
  };
  const hideTalas = (e) => {
    map.removeLayer(TALAS);
    loadData();
  };
  const showGSM = (e) => {
    map.addLayer(GMA);
    loadData();
  };
  const hideGSM = (e) => {
    map.removeLayer(GMA);
    loadData();
  };
  //-----Kontextmenu----ende------------

  const showAddStationPopup = (e, map) => {
    const popupContent = `
      <form id="addStationForm" class="m-0 p-2 w-full">
      <div class="flex items-center mb-4">      
        <label for="name" class="block mr-2 flex-none">Name:</label>
        <input
          type="text"
          id="name"
          name="name"
          placeholder="Name der Station"
          class="block p-2 flex-grow border-2 border-gray-200 rounded-md text-sm"
        />
      </div>
      
      <div class="flex items-center mb-4">   
        <label for="type" class="block mr-3 flex-none">Type:</label>
        <input
          type="text"
          id="type"
          name="type"
          placeholder="Typ der Station"
          class="block p-2 flex-grow border-2 border-gray-200 rounded-md text-sm"
        />
      </div>
      
      <div class="flex items-center mb-4">
        <label for="lat" class="block mr-2 flex-none">Breitengrad:</label>
        <input
          type="text"
          id="lat"
          name="lat"
          value="${e.latlng.lat.toFixed(5)}"
          readonly
          class="block p-2 flex-grow border-2 border-gray-200 rounded-md text-sm"
        />
      </div>
       
      <div class="flex items-center mb-4">   
        <label for="lng" class="block mr-2 flex-none">Längengrad:</label>
        <input
          type="text"
          id="lng"
          name="lng"
          value="${e.latlng.lng.toFixed(5)}"
          readonly
          class="block p-2 flex-grow border-2 border-gray-200 rounded-md text-sm"
        />
      </div>
      
      <button
        type="submit"
        class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded w-full"
      >
        Station hinzufügen
      </button>
    </form>
    `;

    L.popup().setLatLng(e.latlng).setContent(popupContent).openOn(map);

    // Verzögerung hinzufügen, um sicherzustellen, dass das Formular im DOM verfügbar ist
    setTimeout(() => {
      const form = document.getElementById("addStationForm");
      if (form) {
        form.addEventListener("submit", async (event) => {
          event.preventDefault();
          const name = event.target.name.value;
          const type = event.target.type.value;
          const lat = event.target.lat.value;
          const lng = event.target.lng.value;

          // Hier wird `onAddLocation` mit den Werten aufgerufen, die aus dem Formular gesammelt wurden
          await onAddLocation(name, type, lat, lng);
          map.closePopup();
        });
      }
    }, 10);
  };

  return <div id="map" ref={mapRef} className="h-screen"></div>;
};

export default MapComponent;