'use client';

import { useState, useEffect, useCallback } from 'react';
import { adminService } from '@/services/admin.service';
import { Ticket } from '@/types';
import { StatusBadge } from '@/components/ui';

export default function TicketManagement() {
  const [tickets, setTickets] = useState<Ticket[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [page, setPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const [totalTickets, setTotalTickets] = useState(0);
  const [filterStatus, setFilterStatus] = useState<string>('');
  const [filterPrizeType, setFilterPrizeType] = useState<string>('');
  const [selectedTicket, setSelectedTicket] = useState<Ticket | null>(null);

  const loadTickets = useCallback(async () => {
    try {
      setLoading(true);
      setError(null);

      // Construire les filtres
      const filters: any = {};
      if (filterStatus) filters.status = filterStatus;
      if (filterPrizeType) filters.prizeType = filterPrizeType;

      const response = await adminService.getAllTickets(
        page,
        20,
        Object.keys(filters).length > 0 ? filters : undefined
      );

      // Vérifier si la réponse est directement un tableau ou un objet avec data
      let ticketsData: Ticket[] = [];
      let total = 0;
      let totalPagesCount = 1;

      if (Array.isArray(response)) {
        ticketsData = response;
        total = response.length;
        totalPagesCount = 1;
      } else if (response.data && Array.isArray(response.data)) {
        ticketsData = response.data;
        total = response.total || response.data.length;
        totalPagesCount = response.totalPages || 1;
      }

      setTickets(ticketsData);
      setTotalPages(totalPagesCount);
      setTotalTickets(total);
    } catch (err: any) {
      let errorMessage = 'Erreur lors du chargement des tickets';

      if (err.status === 401) {
        errorMessage = '🔐 Non autorisé (401) - Votre session a expiré ou votre token est invalide. Veuillez vous reconnecter.';
      } else if (err.status === 403) {
        errorMessage = '🚫 Accès refusé (403) - Vous n\'avez pas les permissions administrateur nécessaires.';
      } else if (err.status === 0 || err.message.includes('fetch')) {
        errorMessage = '🔌 Impossible de contacter le serveur. Vérifiez que le backend est démarré sur http://localhost:4000';
      } else {
        errorMessage = err.message || errorMessage;
      }

      setError(errorMessage);
      setTickets([]);
      setTotalTickets(0);
    } finally {
      setLoading(false);
    }
  }, [page, filterStatus, filterPrizeType]);

  useEffect(() => {
    loadTickets();
  }, [loadTickets]);


  if (loading && tickets.length === 0) {
    return <div className="text-center py-8">Chargement des tickets...</div>;
  }

  return (
    <div className="p-6">
      <div className="flex justify-between items-center mb-6">
        <h1 className="text-2xl font-bold">Gestion des Tickets</h1>
        <button
          onClick={loadTickets}
          disabled={loading}
          className="bg-blue-600 text-white px-4 py-2 rounded-lg hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed"
        >
          {loading ? 'Chargement...' : 'Actualiser'}
        </button>
      </div>

      {error && (
        <div className="bg-red-100 border border-red-400 text-red-700 px-4 py-3 rounded mb-4">
          <p className="font-bold">Erreur de chargement:</p>
          <p className="mt-1">{error}</p>

          {error.includes('401') && (
            <div className="mt-3 space-y-2">
              <p className="text-sm font-medium">✅ Le header Authorization est bien envoyé</p>
              <p className="text-sm">❌ Mais votre token est invalide ou a expiré</p>
              <div className="flex gap-2 mt-2">
                <a
                  href="/login"
                  className="text-sm bg-red-600 text-white px-3 py-1 rounded hover:bg-red-700"
                >
                  → Se reconnecter
                </a>
                <a
                  href="/admin/diagnostic"
                  className="text-sm bg-blue-600 text-white px-3 py-1 rounded hover:bg-blue-700"
                >
                  🩺 Diagnostic complet
                </a>
              </div>
            </div>
          )}

          {error.includes('403') && (
            <div className="mt-3 space-y-2">
              <p className="text-sm">Vous n'avez pas le rôle ADMIN requis.</p>
              <a
                href="/admin/diagnostic"
                className="inline-block text-sm bg-blue-600 text-white px-3 py-1 rounded hover:bg-blue-700"
              >
                🩺 Voir le diagnostic complet
              </a>
            </div>
          )}

          {!error.includes('401') && !error.includes('403') && (
            <div className="mt-3 space-y-2">
              <p className="text-sm">Vérifiez que le backend est démarré sur http://localhost:4000</p>
              <a
                href="/admin/diagnostic"
                className="inline-block text-sm bg-blue-600 text-white px-3 py-1 rounded hover:bg-blue-700"
              >
                🩺 Lancer le diagnostic
              </a>
            </div>
          )}
        </div>
      )}

      {/* Info et Filtres */}
      <div className="mb-4 flex justify-between items-center">
        <div className="text-sm text-gray-600">
          {totalTickets > 0 && (
            <span>
              {totalTickets} ticket{totalTickets > 1 ? 's' : ''} au total
              {(filterStatus || filterPrizeType) && ' (filtré)'}
            </span>
          )}
        </div>
        <div className="flex gap-3">
          {/* Filtre par type de lot */}
          <select
            value={filterPrizeType}
            onChange={(e) => {
              setFilterPrizeType(e.target.value);
              setPage(1);
            }}
            className="border rounded px-3 py-2"
          >
            <option value="">Tous les lots</option>
            <option value="INFUSEUR">Infuseur à thé</option>
            <option value="THE_GRATUIT">Thé détox/infusion 100g</option>
            <option value="THE_SIGNATURE">Thé signature 100g</option>
            <option value="COFFRET_DECOUVERTE">Coffret découverte 39€</option>
            <option value="COFFRET_PRESTIGE">Coffret prestige 69€</option>
          </select>

          {/* Filtre par statut */}
          <select
            value={filterStatus}
            onChange={(e) => {
              setFilterStatus(e.target.value);
              setPage(1);
            }}
            className="border rounded px-3 py-2"
          >
            <option value="">Tous les statuts</option>
            <option value="PENDING">En attente</option>
            <option value="REJECTED">Rejeté</option>
            <option value="CLAIMED">Réclamé</option>
          </select>

          {/* Bouton pour réinitialiser les filtres */}
          {(filterStatus || filterPrizeType) && (
            <button
              onClick={() => {
                setFilterStatus('');
                setFilterPrizeType('');
                setPage(1);
              }}
              className="text-sm text-gray-600 hover:text-gray-900 underline"
            >
              Réinitialiser
            </button>
          )}
        </div>
      </div>

      {/* Table des tickets */}
      <div className="bg-white rounded-lg shadow overflow-hidden">
        <table className="min-w-full divide-y divide-gray-200">
          <thead className="bg-gray-50">
            <tr>
              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                Code Ticket
              </th>
              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                Lot Gagné
              </th>
              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                Statut
              </th>
              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                Joué le
              </th>
              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                Utilisé par
              </th>
              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                Actions
              </th>
            </tr>
          </thead>
          <tbody className="bg-white divide-y divide-gray-200">
            {tickets.length === 0 ? (
              <tr>
                <td colSpan={6} className="px-6 py-12 text-center">
                  <div className="flex flex-col items-center justify-center">
                    <div className="text-6xl mb-4">🎫</div>
                    <p className="text-gray-900 font-medium text-lg mb-2">
                      {!error ? 'Aucun ticket trouvé' : 'Impossible de charger les tickets'}
                    </p>
                    <p className="text-gray-500 text-sm mb-4">
                      {filterStatus
                        ? `Aucun ticket avec le statut "${filterStatus === 'PENDING' ? 'En attente' : filterStatus === 'CLAIMED' ? 'Réclamé' : filterStatus === 'REJECTED' ? 'Rejeté' : filterStatus}"`
                        : 'Aucun ticket n\'a été créé pour le moment'
                      }
                    </p>
                    {!error && (
                      <p className="text-gray-400 text-xs">
                        Les tickets apparaîtront ici une fois que des utilisateurs auront joué au jeu
                      </p>
                    )}
                  </div>
                </td>
              </tr>
            ) : (
              tickets.map((ticket) => (
                <tr key={ticket.id} className="hover:bg-gray-50">
                {/* CODE TICKET */}
                <td className="px-6 py-4 whitespace-nowrap">
                  <div className="text-sm font-mono font-medium text-gray-900">
                    {ticket.code}
                  </div>
                </td>

                {/* LOT GAGNÉ */}
                <td className="px-6 py-4 whitespace-nowrap">
                  <div className="text-sm font-semibold text-gray-900">
                    {ticket.prize?.name || 'N/A'}
                  </div>
                </td>

                {/* STATUT */}
                <td className="px-6 py-4 whitespace-nowrap">
                  <StatusBadge type="ticket" value={ticket.status} />
                </td>

                {/* DISTRIBUÉ LE (date d'utilisation du ticket) */}
                <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">
                  {ticket.playedAt ? new Date(ticket.playedAt).toLocaleDateString('fr-FR', {
                    year: 'numeric',
                    month: '2-digit',
                    day: '2-digit'
                  }) : '-'}
                </td>

                {/* UTILISÉ PAR */}
                <td className="px-6 py-4 whitespace-nowrap">
                  <div className="text-sm text-gray-900">
                    {ticket.user ? `${ticket.user.firstName} ${ticket.user.lastName}` : '-'}
                  </div>
                  {ticket.user && (
                    <div className="text-xs text-gray-500">
                      {ticket.user.email}
                    </div>
                  )}
                </td>

                {/* ACTIONS */}
                <td className="px-6 py-4 whitespace-nowrap text-sm font-medium">
                  <button
                    onClick={() => setSelectedTicket(ticket)}
                    className="text-blue-600 hover:text-blue-900"
                  >
                    Détails
                  </button>
                </td>
              </tr>
            ))
            )}
          </tbody>
        </table>
      </div>

      {/* Pagination */}
      <div className="flex justify-center gap-2 mt-4">
        <button
          onClick={() => setPage((p) => Math.max(1, p - 1))}
          disabled={page === 1}
          className="px-4 py-2 border rounded disabled:opacity-50 disabled:cursor-not-allowed"
        >
          Précédent
        </button>
        <span className="px-4 py-2">
          Page {page} sur {totalPages}
        </span>
        <button
          onClick={() => setPage((p) => Math.min(totalPages, p + 1))}
          disabled={page === totalPages}
          className="px-4 py-2 border rounded disabled:opacity-50 disabled:cursor-not-allowed"
        >
          Suivant
        </button>
      </div>


      {/* Modal détails ticket */}
      {selectedTicket && (
        <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
          <div className="bg-white rounded-lg p-6 max-w-2xl w-full max-h-[90vh] overflow-y-auto">
            <h2 className="text-xl font-bold mb-4">Détails du ticket</h2>

            <div className="space-y-4">
              <div className="grid grid-cols-2 gap-4">
                <div>
                  <p className="text-sm font-medium text-gray-500">Code</p>
                  <p className="mt-1 text-sm font-mono">{selectedTicket.code}</p>
                </div>
                <div>
                  <p className="text-sm font-medium text-gray-500">Statut</p>
                  <p className="mt-1">
                    <StatusBadge type="ticket" value={selectedTicket.status} />
                  </p>
                </div>
              </div>

              <div>
                <p className="text-sm font-medium text-gray-500">Utilisateur</p>
                <p className="mt-1 text-sm">
                  {selectedTicket.user ? `${selectedTicket.user.firstName} ${selectedTicket.user.lastName}` : 'N/A'}
                </p>
                <p className="text-sm text-gray-500">{selectedTicket.user?.email}</p>
              </div>

              <div>
                <p className="text-sm font-medium text-gray-500">Prix gagné</p>
                <p className="mt-1 text-sm">{selectedTicket.prize?.name}</p>
                <p className="text-sm text-gray-500">{selectedTicket.prize?.description}</p>
                <p className="text-sm font-medium">{selectedTicket.prize?.value}€</p>
              </div>

              <div className="grid grid-cols-2 gap-4">
                <div>
                  <p className="text-sm font-medium text-gray-500">Date de jeu</p>
                  <p className="mt-1 text-sm">
                    {selectedTicket.playedAt ? new Date(selectedTicket.playedAt).toLocaleString('fr-FR') : 'N/A'}
                  </p>
                </div>
                {selectedTicket.validatedAt && (
                  <div>
                    <p className="text-sm font-medium text-gray-500">Date de validation</p>
                    <p className="mt-1 text-sm">
                      {new Date(selectedTicket.validatedAt).toLocaleString('fr-FR')}
                    </p>
                  </div>
                )}
              </div>

              {selectedTicket.rejectionReason && (
                <div>
                  <p className="text-sm font-medium text-gray-500">Raison du rejet</p>
                  <p className="mt-1 text-sm text-red-600">{selectedTicket.rejectionReason}</p>
                </div>
              )}
            </div>

            <div className="mt-6">
              <button
                onClick={() => setSelectedTicket(null)}
                className="w-full bg-gray-300 text-gray-700 px-4 py-2 rounded hover:bg-gray-400"
              >
                Fermer
              </button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}
