import React, { useEffect, useRef } from 'react';
import L from 'leaflet';
import 'leaflet/dist/leaflet.css';

// Fix for default marker icon in Leaflet with Next.js
if (typeof window !== 'undefined') {
  const DefaultIcon = L.icon({
    iconUrl: 'https://unpkg.com/leaflet@1.9.4/dist/images/marker-icon.png',
    shadowUrl: 'https://unpkg.com/leaflet@1.9.4/dist/images/marker-shadow.png',
    iconSize: [25, 41],
    iconAnchor: [12, 41],
  });

  L.Marker.prototype.options.icon = DefaultIcon;
}

export interface MapLocation {
  name: string;
  address: string;
  lat: number;
  lng: number;
}

interface LeafletMapProps {
  locations: MapLocation[];
}

export default function LeafletMap({ locations }: LeafletMapProps) {
  const mapRef = useRef<HTMLDivElement>(null);
  const mapInstanceRef = useRef<L.Map | null>(null);

  useEffect(() => {
    if (!mapRef.current || mapInstanceRef.current || !locations.length) return;

    // Calculate center based on markers or first marker
    const firstLoc = locations[0];
    const map = L.map(mapRef.current, {
      center: [firstLoc.lat, firstLoc.lng],
      zoom: 6, // Zoom out to see both or more
      scrollWheelZoom: false,
    });

    // Add tiles (Dark mode themed for industrial feel if possible, but standard OSM is safer for now)
    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
      attribution:
        '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
    }).addTo(map);

    const bounds = L.latLngBounds([]);

    locations.forEach((loc) => {
      const marker = L.marker([loc.lat, loc.lng]).addTo(map);
      const popupContent = `
        <div class="p-2">
          <div class="text-primary font-bold border-b border-neutral-100 pb-1 mb-1">${loc.name}</div>
          <div class="text-xs text-neutral-600">${loc.address.replace(/\n/g, '<br/>')}</div>
        </div>
      `;
      marker.bindPopup(popupContent);
      bounds.extend([loc.lat, loc.lng]);
    });

    // Fit bounds if more than 1 location
    if (locations.length > 1) {
      map.fitBounds(bounds, { padding: [50, 50] });
    }

    mapInstanceRef.current = map;

    // Cleanup on unmount
    return () => {
      if (mapInstanceRef.current) {
        mapInstanceRef.current.remove();
        mapInstanceRef.current = null;
      }
    };
  }, [locations]);

  return <div ref={mapRef} className="h-full w-full z-0 rounded-2xl shadow-inner border border-neutral-200" />;
}