'use client'

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

interface SchoolSearchProps {
  city: string
  bundesland: string
  bundeslandName: string
  selectedSchool: string
  onSelectSchool: (schoolName: string, schoolId?: string) => void
  className?: string
}

interface SchoolSuggestion {
  id: string
  name: string
  type: string
  address?: string
  city?: string
  source: 'api' | 'mock'
}

// Edu-Search API URL - uses HTTPS proxy on port 8089 (edu-search runs on 8088)
const getApiUrl = () => {
  if (typeof window === 'undefined') return 'http://localhost:8088'
  const { hostname, protocol } = window.location
  // localhost: direct HTTP to 8088, macmini: HTTPS via nginx proxy on 8089
  return hostname === 'localhost' ? 'http://localhost:8088' : `${protocol}//${hostname}:8089`
}

// Attribution data for Open Data sources by Bundesland (CTRL-SRC-001)
const BUNDESLAND_ATTRIBUTION: Record<string, { source: string; license: string; licenseUrl: string }> = {
  BW: { source: 'Open Data Baden-Wuerttemberg', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  BY: { source: 'Open Data Bayern', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  BE: { source: 'Datenportal Berlin', license: 'CC-BY', licenseUrl: 'https://creativecommons.org/licenses/by/4.0/' },
  BB: { source: 'Daten Brandenburg', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  HB: { source: 'Open Data Bremen', license: 'CC-BY', licenseUrl: 'https://creativecommons.org/licenses/by/4.0/' },
  HH: { source: 'Transparenzportal Hamburg', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  HE: { source: 'Open Data Hessen', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  MV: { source: 'Open Data MV', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  NI: { source: 'Open Data Niedersachsen', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  NW: { source: 'Open.NRW', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  RP: { source: 'Open Data Rheinland-Pfalz', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  SL: { source: 'Open Data Saarland', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  SN: { source: 'Datenportal Sachsen', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  ST: { source: 'Open Data Sachsen-Anhalt', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  SH: { source: 'Open Data Schleswig-Holstein', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
  TH: { source: 'Open Data Thueringen', license: 'DL-DE-BY-2.0', licenseUrl: 'https://www.govdata.de/dl-de/by-2-0' },
}

// Category to display type mapping
const getCategoryDisplayType = (category?: string): string => {
  switch (category) {
    case 'primary': return 'Grundschule'
    case 'secondary': return 'Sekundarschule'
    case 'vocational': return 'Berufsschule'
    case 'special': return 'Foerderschule'
    default: return 'Schule'
  }
}

export function SchoolSearch({
  city,
  bundesland,
  bundeslandName,
  selectedSchool,
  onSelectSchool,
  className = ''
}: SchoolSearchProps) {
  const { isDark } = useTheme()
  const [searchQuery, setSearchQuery] = useState(selectedSchool || '')
  const [suggestions, setSuggestions] = useState<SchoolSuggestion[]>([])
  const [isSearching, setIsSearching] = useState(false)
  const [showSuggestions, setShowSuggestions] = useState(false)
  const searchTimeoutRef = useRef<NodeJS.Timeout | null>(null)
  const containerRef = useRef<HTMLDivElement>(null)

  // Suche nach Schulen (echte API)
  const searchSchools = useCallback(async (query: string) => {
    if (query.length < 2) {
      setSuggestions([])
      return
    }

    setIsSearching(true)

    try {
      // Real API call to edu-search-service
      const params = new URLSearchParams({
        q: query,
        limit: '10',
      })
      if (city) params.append('city', city)
      if (bundesland) params.append('state', bundesland)

      const response = await fetch(`${getApiUrl()}/api/v1/schools/search?${params}`)

      if (response.ok) {
        const data = await response.json()
        const apiSchools: SchoolSuggestion[] = (data.schools || []).map((school: {
          id: string
          name: string
          school_type_name?: string
          school_category?: string
          street?: string
          city?: string
          postal_code?: string
        }) => ({
          id: school.id,
          name: school.name,
          type: school.school_type_name || getCategoryDisplayType(school.school_category),
          address: school.street ? `${school.street}, ${school.postal_code || ''} ${school.city || ''}`.trim() : undefined,
          city: school.city,
          source: 'api' as const,
        }))
        setSuggestions(apiSchools)
      } else {
        console.error('School search API error:', response.status)
        setSuggestions([])
      }
    } catch (error) {
      console.error('School search error:', error)
      setSuggestions([])
    } finally {
      setIsSearching(false)
    }
  }, [city, bundesland])

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

    searchTimeoutRef.current = setTimeout(() => {
      searchSchools(searchQuery)
    }, 300)

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

  // Klick ausserhalb schließt Dropdown
  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (containerRef.current && !containerRef.current.contains(event.target as Node)) {
        setShowSuggestions(false)
      }
    }
    document.addEventListener('mousedown', handleClickOutside)
    return () => document.removeEventListener('mousedown', handleClickOutside)
  }, [])

  // Schule auswaehlen
  const handleSelectSchool = (school: SchoolSuggestion) => {
    setSearchQuery(school.name)
    onSelectSchool(school.name, school.id)
    setSuggestions([])
    setShowSuggestions(false)
  }

  // Manuelle Eingabe bestaetigen
  const handleManualInput = () => {
    if (searchQuery.trim()) {
      onSelectSchool(searchQuery.trim())
      setShowSuggestions(false)
    }
  }

  // Schultyp-Icon
  const getSchoolTypeIcon = (type: string) => {
    switch (type.toLowerCase()) {
      case 'gymnasium': return '🎓'
      case 'gesamtschule':
      case 'stadtteilschule': return '🏫'
      case 'realschule': return '📚'
      case 'hauptschule':
      case 'mittelschule': return '📖'
      case 'grundschule': return '🏠'
      case 'berufsschule': return '🔧'
      case 'foerderschule': return '🤝'
      case 'privatschule': return '🏰'
      case 'waldorfschule': return '🌿'
      default: return '🏫'
    }
  }

  return (
    <div className={`space-y-4 ${className}`} ref={containerRef}>
      {/* Suchfeld */}
      <div className="relative">
        <div className="relative">
          <input
            type="text"
            value={searchQuery}
            onChange={(e) => {
              setSearchQuery(e.target.value)
              setShowSuggestions(true)
            }}
            onFocus={() => setShowSuggestions(true)}
            onKeyDown={(e) => {
              if (e.key === 'Enter') {
                handleManualInput()
              }
            }}
            placeholder={`Schule in ${city} suchen...`}
            className={`w-full px-6 py-4 pl-14 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`}
            autoFocus
          />
          <svg
            className={`absolute left-5 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>

        {/* Vorschlaege Dropdown */}
        {showSuggestions && suggestions.length > 0 && (
          <div className={`absolute top-full left-0 right-0 mt-2 rounded-xl border shadow-xl z-50 max-h-80 overflow-y-auto ${
            isDark
              ? 'bg-slate-800/95 border-white/20 backdrop-blur-xl'
              : 'bg-white/95 border-slate-200 backdrop-blur-xl'
          }`}>
            {suggestions.map((school, index) => (
              <button
                key={school.id}
                onClick={() => handleSelectSchool(school)}
                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') : ''}`}
              >
                <span className="text-xl flex-shrink-0">{getSchoolTypeIcon(school.type)}</span>
                <div className="min-w-0 flex-1">
                  <p className="font-medium truncate">{school.name}</p>
                  <div className="flex items-center gap-2 flex-wrap">
                    <span className={`text-xs px-2 py-0.5 rounded-full ${
                      isDark ? 'bg-white/10 text-white/60' : 'bg-slate-100 text-slate-500'
                    }`}>
                      {school.type}
                    </span>
                    {school.address && (
                      <span className={`text-xs truncate ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
                        {school.address}
                      </span>
                    )}
                  </div>
                </div>
                {school.source === 'api' && (
                  <span className={`text-xs px-2 py-0.5 rounded ${
                    isDark ? 'bg-green-500/20 text-green-300' : 'bg-green-100 text-green-700'
                  }`}>
                    verifiziert
                  </span>
                )}
              </button>
            ))}
            {/* Attribution Footer (CTRL-SRC-001) */}
            {(() => {
              const attr = BUNDESLAND_ATTRIBUTION[bundesland]
              return attr ? (
                <div className={`px-4 py-2 text-xs border-t ${
                  isDark ? 'bg-slate-900/50 border-white/10 text-white/40' : 'bg-slate-50 border-slate-200 text-slate-500'
                }`}>
                  <div className="flex items-center gap-1 flex-wrap">
                    <span>Quelle:</span>
                    <span className="font-medium">{attr.source}</span>
                    <span>•</span>
                    <a
                      href={attr.licenseUrl}
                      target="_blank"
                      rel="noopener noreferrer"
                      className={`underline hover:no-underline ${isDark ? 'text-blue-400' : 'text-blue-600'}`}
                      onClick={(e) => e.stopPropagation()}
                    >
                      {attr.license}
                    </a>
                  </div>
                </div>
              ) : null
            })()}
          </div>
        )}

        {/* Keine Ergebnisse Info */}
        {showSuggestions && searchQuery.length >= 2 && suggestions.length === 0 && !isSearching && (
          <div className={`absolute top-full left-0 right-0 mt-2 rounded-xl border p-4 ${
            isDark
              ? 'bg-slate-800/95 border-white/20 backdrop-blur-xl'
              : 'bg-white/95 border-slate-200 backdrop-blur-xl'
          }`}>
            <p className={`text-sm text-center ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
              Keine Schulen gefunden. Tippen Sie den Namen ein und druecken Sie Enter.
            </p>
          </div>
        )}
      </div>

      {/* Standort Info */}
      <div className={`p-4 rounded-xl ${isDark ? 'bg-white/5' : 'bg-slate-50'}`}>
        <div className="flex items-start gap-3">
          <span className="text-2xl">📍</span>
          <div className="text-left flex-1">
            <p className={`text-sm ${isDark ? 'text-white/80' : 'text-slate-700'}`}>
              <strong>{city}</strong>, {bundeslandName}
            </p>
            <p className={`text-xs ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
              Ihr Standort
            </p>
          </div>
        </div>
      </div>

      {/* Hinweis */}
      <p className={`text-xs text-center ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
        Waehlen Sie aus den Vorschlaegen oder geben Sie den Namen manuell ein
      </p>
    </div>
  )
}