import React, { 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, onLocationUpdate }) => {
  const mapRef = useRef(null);
  const [map, setMap] = useState(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";

  let initialMap = [];

  // 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));
  };
  // Initialisiere die Karte
  useEffect(() => {
    if (mapRef.current && !map) {
      initialMap = L.map(mapRef.current, {
        center: [53.111111, 8.4625],
        zoom: 10,
        zoomControl: false, // Deaktiviere die Standard-Zoomsteuerung
        contextmenu: true,
        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,
          },
          {
            text: "Koordinaten",
            icon: "img/screen_same.png",
            callback: lata,
          },
          "-", // Divider
          { text: "Reinzoomen", callback: zoomIn },
          { text: "Rauszoomen", callback: zoomOut },
          { text: "Hier zentrieren", callback: centerHere },
        ],
      });
      L.tileLayer(online ? onlineTileLayer : offlineTileLayer, {
        attribution:
          '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
      }).addTo(initialMap);

      setMap(initialMap);
    }
  }, [mapRef, map]);

  // 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
    }
  }
  //----------------------------------
  //-----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 lata = (e) => {
    alert("Breitengrad: " + e.latlng.lat);
  };

  const zoomIn = (e) => {
    initialMap.flyTo(e.latlng, 12);
  };

  const zoomOut = (e) => {
    fly();
  };
  const centerHere = (e) => {
    initialMap.panTo(e.latlng);
  };

  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------------
  // Ensure this function is only called when map is initialized and available
  const showAddStationPopup = (e) => {
    if (!initialMap) {
      console.log("Map is not initialized.");
      return;
    }

    const popupContent = L.DomUtil.create("div");
    popupContent.innerHTML = `
  <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(initialMap);

    // Attach event listener here
    L.DomEvent.on(popupContent, "submit", handleSubmit);
  };

  /*
  const handleSubmit = (event) => {
    event.preventDefault();
    const form = event.target;
    const data = {
      name: form.name.value,
      type: form.type.value,
      latitude: form.lat.value,
      longitude: form.lng.value,
    };

    onAddLocation(name, type, lat, lng);
    console.log("Name: ", name, "Type: ", type, "Lat: ", lat, "Lng: ", lng);
    map.closePopup();
  };
*/
  // Funktion zum Hinzufügen eines neuen Standorts
  async function handleSubmit(event) {
    event.preventDefault();
    const form = event.target;
    const data = {
      name: form.name.value,
      type: form.type.value,
      latitude: form.lat.value,
      longitude: form.lng.value,
    };

    try {
      const response = await fetch("/api/addLocation", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify(data),
      });

      const result = await response.json();

      if (response.ok) {
        console.log("Standort hinzugefügt:", result);
        alert("Standort erfolgreich hinzugefügt!");
        form.reset(); // Formular zurücksetzen
        // Hier könntest du weitere Aktionen durchführen, wie das Schließen des Popups oder das Aktualisieren der Marker auf der Karte
      } else {
        throw new Error(
          result.error || "Ein unbekannter Fehler ist aufgetreten."
        );
      }
    } catch (error) {
      console.error("Fehler beim Hinzufügen des Standorts:", error);
      alert(error.message);
    }
  }

  function fly(stationValue) {
    var x = 51.41321407879154;
    var y = 7.739617925303934;
    var zoom = 7;

    /*  for (var i = 0; i < dataStaticlength; i++) {
      var gisStatics = dataStatic[i];
      if (stationValue === gisStatics.Area_Name) {
        //console.log(gisStatics.X+","+gisStatics.Y);
        x = gisStatics.X;
        y = gisStatics.Y;
      }
    }
    if (y === 7.739617925303934) {
      zoom = 8;
    } */
    initialMap.flyTo([x, y], zoom);

    /* var popup = new L.Popup();
    oms.addListener("click", function (marker) {
      popup.setContent(marker.desc);
      popup.setLatLng(marker.getLatLng());
      map.openPopup(popup);
    });

    for (var i = 0; i < window.mapData.length; i++) {
      var datum = window.mapData[i];
      var loc = new L.LatLng(datum.lat, datum.lon);
      var marker = new L.Marker(loc);
      marker.desc = datum.d;
      map.addLayer(marker);
      //oms.addMarker(marker);  // <-- here
    } */
  }

  return (
    <div
      id="map"
      ref={mapRef}
      style={{ height: "100vh", width: "100vw", overflow: "hidden" }}
    ></div>
  );
};

export default MapComponent;