'use client'

import { useState, useEffect } from 'react'
import { Building2, Plus, Trash2, Loader2, Pencil, Mail, MapPin } from 'lucide-react'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog'
import { getCompanies, createCompany, updateCompany, deleteCompany } from '@/lib/actions/companies'

export default function CompaniesPage() {
  const [companies, setCompanies] = useState<any[]>([])
  const [loading, setLoading] = useState(true)
  const [isOpen, setIsOpen] = useState(false)
  const [editingCompany, setEditingCompany] = useState<any>(null)
  
  const [name, setName] = useState('')
  const [street, setStreet] = useState('')
  const [zip, setZip] = useState('')
  const [city, setCity] = useState('')
  const [email, setEmail] = useState('')

  const [creating, setCreating] = useState(false)
  const [createError, setCreateError] = useState<string | null>(null)
  const [deletingId, setDeletingId] = useState<string | null>(null)

  const loadCompanies = async () => {
    setLoading(true)
    try {
      const data = await getCompanies()
      setCompanies(data)
    } catch (err) {
      console.error('Fehler beim Laden der Partner:', err)
    } finally {
      setLoading(false)
    }
  }

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

  const handleOpenDialog = (company: any = null) => {
    setEditingCompany(company)
    setName(company ? company.name || '' : '')
    setStreet(company ? company.street || '' : '')
    setZip(company ? company.zip || '' : '')
    setCity(company ? company.city || '' : '')
    setEmail(company ? company.email || '' : '')
    setCreateError(null)
    setIsOpen(true)
  }

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    setCreating(true)
    setCreateError(null)
    try {
      const payload = {
        name: name.trim(),
        street: street.trim(),
        zip: zip.trim(),
        city: city.trim(),
        email: email.trim(),
      }
      if (editingCompany) {
        await updateCompany(editingCompany.id, payload)
      } else {
        await createCompany(payload)
      }
      setIsOpen(false)
      loadCompanies()
    } catch (err: any) {
      setCreateError(err.message || 'Fehler beim Speichern.')
    } finally {
      setCreating(false)
    }
  }

  const handleDelete = async (id: string, firmName: string) => {
    if (!confirm(`Firma "${firmName}" wirklich löschen? Alle zugewiesenen Partner werden getrennt.`)) return
    setDeletingId(id)
    try {
      await deleteCompany(id)
      loadCompanies()
    } catch (err) {
      console.error('Fehler beim Löschen:', err)
    } finally {
      setDeletingId(null)
    }
  }

  return (
    <div className="p-6 max-w-5xl mx-auto text-slate-900 dark:text-white space-y-8">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-3xl font-extrabold tracking-tight flex items-center gap-3">
            <Building2 className="w-8 h-8 text-blue-500" />
            Firmenverwaltung
          </h1>
          <p className="text-slate-500 dark:text-slate-400 text-sm mt-1">
            Verwalten Sie Firmen, deren Lieferadresse und weisen Sie Partner zu.
          </p>
        </div>
        <Button
          onClick={() => handleOpenDialog()}
          className="bg-blue-600 hover:bg-blue-700 text-white font-semibold"
        >
          <Plus className="w-4 h-4 mr-2" /> Firma anlegen
        </Button>
      </div>

      {/* Firmen-Tabelle */}
      <div className="p-5 bg-white dark:bg-slate-900/50 rounded-xl border border-slate-200 dark:border-white/10 shadow-sm">
        {loading ? (
          <div className="flex justify-center items-center py-16">
            <Loader2 className="w-8 h-8 text-blue-500 animate-spin" />
            <span className="ml-3 text-slate-400 text-sm">Lade Firmen...</span>
          </div>
        ) : companies.length === 0 ? (
          <div className="text-center py-16 border-2 border-dashed border-slate-200 dark:border-white/5 rounded-xl text-slate-500">
            <Building2 className="w-10 h-10 mx-auto mb-3 opacity-30" />
            Noch keine Firmen angelegt.
          </div>
        ) : (
          <table className="w-full text-left">
            <thead>
              <tr className="border-b border-slate-200 dark:border-white/10 text-slate-400 text-xs font-semibold uppercase">
                <th className="pb-3">Firmenname</th>
                <th className="pb-3">Lieferadresse</th>
                <th className="pb-3">E-Mail</th>
                <th className="pb-3">Erstellt am</th>
                <th className="pb-3 text-right">Aktionen</th>
              </tr>
            </thead>
            <tbody className="divide-y divide-slate-100 dark:divide-white/5">
              {companies.map((company) => (
                <tr key={company.id} className="hover:bg-slate-50 dark:hover:bg-white/3 transition-colors">
                  <td className="py-4 font-semibold text-slate-900 dark:text-white">
                    <div className="flex items-center gap-2">
                      <Building2 className="w-4 h-4 text-blue-500 shrink-0" />
                      {company.name}
                    </div>
                  </td>
                  <td className="py-4 text-sm text-slate-700 dark:text-slate-300">
                    <div className="flex items-center gap-2">
                      <MapPin className="w-3.5 h-3.5 text-slate-400 shrink-0" />
                      <span>
                        {company.street ? `${company.street}, ${company.zip} ${company.city}` : '–'}
                      </span>
                    </div>
                  </td>
                  <td className="py-4 text-sm text-slate-700 dark:text-slate-300">
                    {company.email ? (
                      <div className="flex items-center gap-2">
                        <Mail className="w-3.5 h-3.5 text-slate-400 shrink-0" />
                        <span>{company.email}</span>
                      </div>
                    ) : '–'}
                  </td>
                  <td className="py-4 text-sm text-slate-500 dark:text-slate-400">
                    {company.created_at ? new Date(company.created_at).toLocaleDateString('de-DE') : '–'}
                  </td>
                  <td className="py-4 text-right">
                    <div className="flex justify-end gap-2">
                      <Button
                        variant="ghost"
                        size="icon"
                        onClick={() => handleOpenDialog(company)}
                        className="h-8 w-8 text-blue-500 hover:text-blue-400 hover:bg-blue-500/10"
                        title="Firma bearbeiten"
                      >
                        <Pencil className="h-4 w-4" />
                      </Button>
                      <Button
                        variant="ghost"
                        size="icon"
                        disabled={deletingId === company.id}
                        onClick={() => handleDelete(company.id, company.name)}
                        className="h-8 w-8 text-red-500 hover:text-red-400 hover:bg-red-500/10"
                        title="Firma löschen"
                      >
                        {deletingId === company.id
                          ? <Loader2 className="h-4 w-4 animate-spin" />
                          : <Trash2 className="h-4 w-4" />}
                      </Button>
                    </div>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        )}
      </div>

      {/* Dialog: Firma anlegen / bearbeiten */}
      <Dialog open={isOpen} onOpenChange={setIsOpen}>
        <DialogContent className="bg-white dark:bg-slate-950 border-slate-200 dark:border-white/10 text-slate-900 dark:text-white shadow-2xl">
          <DialogHeader>
            <DialogTitle>
              {editingCompany ? 'Firma bearbeiten' : 'Neue Firma anlegen'}
            </DialogTitle>
            <DialogDescription className="text-slate-500 dark:text-slate-400">
              Geben Sie die Firmendetails und die vollständige Lieferadresse ein. Alle Felder sind Pflichtfelder.
            </DialogDescription>
          </DialogHeader>
          <form onSubmit={handleSubmit} className="space-y-4 mt-2">
            <div className="space-y-2">
              <Label htmlFor="company-name">Firmenname</Label>
              <Input
                id="company-name"
                type="text"
                required
                placeholder="Muster GmbH"
                value={name}
                onChange={(e) => setName(e.target.value)}
                className="bg-slate-50 dark:bg-white/5 border-slate-200 dark:border-white/10"
              />
            </div>
            
            <div className="space-y-2">
              <Label htmlFor="company-street">Straße & Hausnummer</Label>
              <Input
                id="company-street"
                type="text"
                required
                placeholder="Musterstraße 123"
                value={street}
                onChange={(e) => setStreet(e.target.value)}
                className="bg-slate-50 dark:bg-white/5 border-slate-200 dark:border-white/10"
              />
            </div>

            <div className="grid grid-cols-3 gap-4">
              <div className="space-y-2 col-span-1">
                <Label htmlFor="company-zip">PLZ</Label>
                <Input
                  id="company-zip"
                  type="text"
                  required
                  placeholder="12345"
                  value={zip}
                  onChange={(e) => setZip(e.target.value)}
                  className="bg-slate-50 dark:bg-white/5 border-slate-200 dark:border-white/10"
                />
              </div>
              <div className="space-y-2 col-span-2">
                <Label htmlFor="company-city">Ort</Label>
                <Input
                  id="company-city"
                  type="text"
                  required
                  placeholder="Musterstadt"
                  value={city}
                  onChange={(e) => setCity(e.target.value)}
                  className="bg-slate-50 dark:bg-white/5 border-slate-200 dark:border-white/10"
                />
              </div>
            </div>

            <div className="space-y-2">
              <Label htmlFor="company-email">E-Mail für Lieferadresse</Label>
              <Input
                id="company-email"
                type="email"
                required
                placeholder="lieferung@musterfirma.de"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                className="bg-slate-50 dark:bg-white/5 border-slate-200 dark:border-white/10"
              />
            </div>

            {createError && (
              <p className="text-sm text-red-600 dark:text-red-400">{createError}</p>
            )}
            <DialogFooter className="pt-2">
              <Button type="button" variant="outline" onClick={() => setIsOpen(false)} disabled={creating}>
                Abbrechen
              </Button>
              <Button type="submit" disabled={creating} className="bg-blue-600 hover:bg-blue-700 text-white font-semibold">
                {creating ? <Loader2 className="w-4 h-4 mr-2 animate-spin" /> : null}
                {editingCompany ? 'Speichern' : 'Anlegen'}
              </Button>
            </DialogFooter>
          </form>
        </DialogContent>
      </Dialog>
    </div>
  )
}
