'use client'

import { useState, useEffect, useRef, useCallback } from 'react'
import { useTheme } from '@/lib/ThemeContext'
import dynamic from 'next/dynamic'

// Leaflet Komponente dynamisch laden (nur Client-Side)
const CityMapLeaflet = dynamic(
  () => import('./CityMapLeaflet'),
  {
    ssr: false,
    loading: () => (
      <div className="h-64 rounded-2xl bg-slate-200 dark:bg-white/10 flex items-center justify-center">
        <div className="w-6 h-6 border-2 border-blue-500 border-t-transparent rounded-full animate-spin" />
      </div>
    )
  }
)

interface CityMapProps {
  bundesland: string
  bundeslandName: string
  selectedCity: string
  onSelectCity: (city: string, lat?: number, lng?: number) => void
  className?: string
}

// Bundesland-Zentren für initiale Kartenposition
const bundeslandCenters: Record<string, { lat: number; lng: number; zoom: number }> = {
  'SH': { lat: 54.2, lng: 9.9, zoom: 8 },
  'HH': { lat: 53.55, lng: 10.0, zoom: 11 },
  'MV': { lat: 53.9, lng: 12.4, zoom: 8 },
  'HB': { lat: 53.1, lng: 8.8, zoom: 11 },
  'NI': { lat: 52.8, lng: 9.5, zoom: 7 },
  'BE': { lat: 52.52, lng: 13.4, zoom: 11 },
  'BB': { lat: 52.4, lng: 13.2, zoom: 8 },
  'ST': { lat: 51.9, lng: 11.7, zoom: 8 },
  'NW': { lat: 51.5, lng: 7.5, zoom: 8 },
  'HE': { lat: 50.6, lng: 9.0, zoom: 8 },
  'TH': { lat: 50.9, lng: 11.0, zoom: 8 },
  'SN': { lat: 51.1, lng: 13.2, zoom: 8 },
  'RP': { lat: 49.9, lng: 7.5, zoom: 8 },
  'SL': { lat: 49.4, lng: 7.0, zoom: 9 },
  'BW': { lat: 48.7, lng: 9.0, zoom: 8 },
  'BY': { lat: 48.8, lng: 11.5, zoom: 7 },
}

export function CityMap({
  bundesland,
  bundeslandName,
  selectedCity,
  onSelectCity,
  className = ''
}: CityMapProps) {
  const { isDark } = useTheme()
  const [searchQuery, setSearchQuery] = useState(selectedCity || '')
  const [searchResults, setSearchResults] = useState<any[]>([])
  const [isSearching, setIsSearching] = useState(false)
  const [markerPosition, setMarkerPosition] = useState<[number, number] | null>(null)
  const searchTimeoutRef = useRef<NodeJS.Timeout | null>(null)

  const center = bundeslandCenters[bundesland] || { lat: 51.2, lng: 10.4, zoom: 6 }

  // Nominatim-Suche mit Debouncing
  const searchCity = useCallback(async (query: string) => {
    if (query.length < 2) {
      setSearchResults([])
      return
    }

    setIsSearching(true)
    try {
      // Nominatim API für Geocoding (OpenStreetMap)
      const response = await fetch(
        `https://nominatim.openstreetmap.org/search?` +
        `q=${encodeURIComponent(query)}, ${bundeslandName}, Deutschland&` +
        `format=json&addressdetails=1&limit=8&countrycodes=de`,
        {
          headers: {
            'Accept-Language': 'de',
          }
        }
      )
      const data = await response.json()

      // Filtere nach relevanten Ergebnissen (Städte, Orte, Gemeinden)
      const filtered = data.filter((item: any) =>
        item.type === 'city' ||
        item.type === 'town' ||
        item.type === 'village' ||
        item.type === 'municipality' ||
        item.type === 'administrative' ||
        item.class === 'place'
      )

      setSearchResults(filtered.length > 0 ? filtered : data.slice(0, 5))
    } catch (error) {
      console.error('Geocoding error:', error)
      setSearchResults([])
    } finally {
      setIsSearching(false)
    }
  }, [bundeslandName])

  // Debounced Search
  useEffect(() => {
    if (searchTimeoutRef.current) {
      clearTimeout(searchTimeoutRef.current)
    }

    searchTimeoutRef.current = setTimeout(() => {
      searchCity(searchQuery)
    }, 400)

    return () => {
      if (searchTimeoutRef.current) {
        clearTimeout(searchTimeoutRef.current)
      }
    }
  }, [searchQuery, searchCity])

  // Reverse Geocoding bei Kartenklick
  const handleMapClick = async (lat: number, lng: number) => {
    setMarkerPosition([lat, lng])

    try {
      const response = await fetch(
        `https://nominatim.openstreetmap.org/reverse?` +
        `lat=${lat}&lon=${lng}&format=json&addressdetails=1`,
        {
          headers: {
            'Accept-Language': 'de',
          }
        }
      )
      const data = await response.json()

      // Extrahiere Stadt/Ort aus der Adresse
      const city = data.address?.city ||
                   data.address?.town ||
                   data.address?.village ||
                   data.address?.municipality ||
                   data.address?.county ||
                   'Unbekannter Ort'

      setSearchQuery(city)
      onSelectCity(city, lat, lng)
    } catch (error) {
      console.error('Reverse geocoding error:', error)
    }
  }

  // Suchergebnis auswählen
  const handleSelectResult = (result: any) => {
    const cityName = result.address?.city ||
                     result.address?.town ||
                     result.address?.village ||
                     result.address?.municipality ||
                     result.display_name.split(',')[0]

    setSearchQuery(cityName)
    setMarkerPosition([parseFloat(result.lat), parseFloat(result.lon)])
    onSelectCity(cityName, parseFloat(result.lat), parseFloat(result.lon))
    setSearchResults([])
  }

  // Manuelle Eingabe bestätigen
  const handleManualInput = () => {
    if (searchQuery.trim()) {
      onSelectCity(searchQuery.trim())
      setSearchResults([])
    }
  }

  return (
    <div className={`space-y-4 ${className}`}>
      {/* Suchfeld */}
      <div className="relative">
        <div className="relative">
          <input
            type="text"
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            onKeyDown={(e) => {
              if (e.key === 'Enter') {
                handleManualInput()
              }
            }}
            placeholder={`Stadt in ${bundeslandName} suchen...`}
            className={`w-full px-5 py-4 pl-12 text-lg rounded-2xl border transition-all ${
              isDark
                ? 'bg-white/10 border-white/20 text-white placeholder-white/40 focus:border-blue-400'
                : 'bg-white border-slate-300 text-slate-900 placeholder-slate-400 focus:border-blue-500'
            } focus:outline-none focus:ring-2 focus:ring-blue-500/30`}
          />
          <svg
            className={`absolute left-4 top-1/2 -translate-y-1/2 w-5 h-5 ${
              isDark ? 'text-white/40' : 'text-slate-400'
            }`}
            fill="none"
            stroke="currentColor"
            viewBox="0 0 24 24"
          >
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
          </svg>
          {isSearching && (
            <div className={`absolute right-4 top-1/2 -translate-y-1/2 w-5 h-5 border-2 border-t-transparent rounded-full animate-spin ${
              isDark ? 'border-white/40' : 'border-slate-400'
            }`} />
          )}
        </div>

        {/* Suchergebnisse Dropdown */}
        {searchResults.length > 0 && (
          <div className={`absolute top-full left-0 right-0 mt-2 rounded-xl border shadow-xl z-50 max-h-64 overflow-y-auto ${
            isDark
              ? 'bg-slate-800/95 border-white/20 backdrop-blur-xl'
              : 'bg-white/95 border-slate-200 backdrop-blur-xl'
          }`}>
            {searchResults.map((result, index) => (
              <button
                key={index}
                onClick={() => handleSelectResult(result)}
                className={`w-full px-4 py-3 text-left transition-colors flex items-center gap-3 ${
                  isDark
                    ? 'hover:bg-white/10 text-white/90'
                    : 'hover:bg-slate-100 text-slate-800'
                } ${index > 0 ? (isDark ? 'border-t border-white/10' : 'border-t border-slate-100') : ''}`}
              >
                <svg className={`w-4 h-4 flex-shrink-0 ${isDark ? 'text-white/50' : 'text-slate-400'}`} fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17.657 16.657L13.414 20.9a1.998 1.998 0 01-2.827 0l-4.244-4.243a8 8 0 1111.314 0z" />
                </svg>
                <div className="min-w-0">
                  <p className="font-medium truncate">
                    {result.address?.city || result.address?.town || result.address?.village || result.display_name.split(',')[0]}
                  </p>
                  <p className={`text-xs truncate ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
                    {result.display_name}
                  </p>
                </div>
              </button>
            ))}
          </div>
        )}
      </div>

      {/* Karte */}
      <div className={`h-64 rounded-2xl overflow-hidden border ${
        isDark ? 'border-white/20' : 'border-slate-300'
      }`}>
        <CityMapLeaflet
          center={center}
          zoom={center.zoom}
          markerPosition={markerPosition}
          onMapClick={handleMapClick}
          isDark={isDark}
        />
      </div>

      {/* Hinweis */}
      <p className={`text-xs text-center ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
        Tippen Sie den Namen ein oder klicken Sie auf die Karte
      </p>
    </div>
  )
}