'use client'

import { useState, useEffect, useCallback } from 'react'
import { useTheme } from '@/lib/ThemeContext'
import { roomsApi } from '@/lib/stundenplan/api'
import type { TimetableRoom, CreateTimetableRoom } from '@/app/stundenplan/types'

const initialForm: CreateTimetableRoom = {
  name: '',
  room_type: '',
  capacity: 30,
  floor_level: 0,
  has_elevator: true,
  notes: '',
}

export function RaeumeManager() {
  const { isDark } = useTheme()
  const [items, setItems] = useState<TimetableRoom[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [showForm, setShowForm] = useState(false)
  const [submitting, setSubmitting] = useState(false)
  const [form, setForm] = useState<CreateTimetableRoom>(initialForm)

  const load = useCallback(async () => {
    setLoading(true); setError(null)
    try {
      const data = await roomsApi.list()
      setItems(data || [])
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Laden fehlgeschlagen')
    } finally { setLoading(false) }
  }, [])

  useEffect(() => { load() }, [load])

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    setSubmitting(true); setError(null)
    try {
      await roomsApi.create(form)
      setForm(initialForm)
      setShowForm(false)
      await load()
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Anlegen fehlgeschlagen')
    } finally { setSubmitting(false) }
  }

  const handleDelete = async (id: string) => {
    if (!confirm('Raum wirklich loeschen?')) return
    try {
      await roomsApi.remove(id)
      await load()
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Loeschen fehlgeschlagen')
    }
  }

  const cardClass = isDark ? 'bg-white/10 border-white/20 text-white' : 'bg-white/80 border-black/10 text-slate-900'
  const inputClass = isDark ? 'bg-white/10 border-white/20 text-white placeholder-white/40' : 'bg-white border-slate-300 text-slate-900 placeholder-slate-400'

  return (
    <div className="space-y-4" data-testid="raeume-manager">
      <div className="flex items-center justify-between">
        <h2 className={`text-xl font-semibold ${isDark ? 'text-white' : 'text-slate-900'}`}>Raeume ({items.length})</h2>
        <button onClick={() => setShowForm(s => !s)} className={`px-4 py-2 rounded-xl font-medium transition-colors ${isDark ? 'bg-indigo-500 hover:bg-indigo-600 text-white' : 'bg-indigo-600 hover:bg-indigo-700 text-white'}`}>
          {showForm ? 'Abbrechen' : '+ Neuer Raum'}
        </button>
      </div>

      {error && <div className="p-3 rounded-xl bg-red-500/20 border border-red-500/40 text-red-300">{error}</div>}

      {showForm && (
        <form onSubmit={handleSubmit} className={`p-4 rounded-2xl border backdrop-blur-xl ${cardClass}`}>
          <div className="grid grid-cols-1 md:grid-cols-3 gap-3">
            <div>
              <label className="block text-sm mb-1 opacity-70">Name</label>
              <input required value={form.name} onChange={e => setForm({ ...form, name: e.target.value })} placeholder="z.B. A101" className={`w-full px-3 py-2 rounded-lg border ${inputClass}`} />
            </div>
            <div>
              <label className="block text-sm mb-1 opacity-70">Typ</label>
              <input value={form.room_type || ''} onChange={e => setForm({ ...form, room_type: e.target.value })} placeholder="z.B. Sporthalle, Chemie" className={`w-full px-3 py-2 rounded-lg border ${inputClass}`} />
            </div>
            <div>
              <label className="block text-sm mb-1 opacity-70">Kapazitaet</label>
              <input type="number" min={0} value={form.capacity ?? 30} onChange={e => setForm({ ...form, capacity: parseInt(e.target.value) || 0 })} className={`w-full px-3 py-2 rounded-lg border ${inputClass}`} />
            </div>
            <div>
              <label className="block text-sm mb-1 opacity-70">Stockwerk</label>
              <input type="number" value={form.floor_level ?? 0} onChange={e => setForm({ ...form, floor_level: parseInt(e.target.value) || 0 })} className={`w-full px-3 py-2 rounded-lg border ${inputClass}`} />
            </div>
            <div className="flex items-center gap-2">
              <input type="checkbox" id="has_elevator" checked={!!form.has_elevator} onChange={e => setForm({ ...form, has_elevator: e.target.checked })} className="w-5 h-5" />
              <label htmlFor="has_elevator" className="text-sm">Aufzug erreichbar</label>
            </div>
            <div className="flex items-end">
              <button type="submit" disabled={submitting} className="w-full px-4 py-2 rounded-lg bg-emerald-500 hover:bg-emerald-600 text-white font-medium disabled:opacity-50">
                {submitting ? 'Speichert...' : 'Anlegen'}
              </button>
            </div>
          </div>
        </form>
      )}

      {loading ? (
        <div className={`text-center py-8 opacity-60 ${isDark ? 'text-white' : 'text-slate-700'}`}>Laedt…</div>
      ) : items.length === 0 ? (
        <div className={`text-center py-8 opacity-60 ${isDark ? 'text-white' : 'text-slate-700'}`}>Noch keine Raeume angelegt.</div>
      ) : (
        <div className={`rounded-2xl border backdrop-blur-xl overflow-hidden ${cardClass}`}>
          <table className="w-full">
            <thead className={isDark ? 'bg-white/5' : 'bg-slate-100'}>
              <tr>
                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Name</th>
                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Typ</th>
                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Kapazitaet</th>
                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Stockwerk</th>
                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Aufzug</th>
                <th className="px-4 py-3"></th>
              </tr>
            </thead>
            <tbody>
              {items.map(r => (
                <tr key={r.id} className={isDark ? 'border-t border-white/10' : 'border-t border-slate-200'}>
                  <td className="px-4 py-3 font-medium">{r.name}</td>
                  <td className="px-4 py-3">{r.room_type || '—'}</td>
                  <td className="px-4 py-3">{r.capacity}</td>
                  <td className="px-4 py-3">{r.floor_level}</td>
                  <td className="px-4 py-3">{r.has_elevator ? 'Ja' : 'Nein'}</td>
                  <td className="px-4 py-3 text-right">
                    <button onClick={() => handleDelete(r.id)} className="text-red-400 hover:text-red-300 text-sm">Loeschen</button>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}
    </div>
  )
}