'use client';

import { useState, useEffect } from 'react';
import { getAllBookings, validateBankTransfer, deleteAdminBooking } from '@/lib/api/admin';

interface Booking {
  id: string;
  bookingNumber?: string | null;
  type?: string;
  status: string;
  origin?: string;
  destination?: string;
  carrierName?: string;
  containerType: string;
  volumeCBM?: number;
  weightKG?: number;
  palletCount?: number;
  priceEUR?: number;
  priceUSD?: number;
  primaryCurrency?: string;
  createdAt?: string;
  requestedAt?: string;
  updatedAt?: string;
  organizationId?: string;
  userId?: string;
}

export default function AdminBookingsPage() {
  const [bookings, setBookings] = useState<Booking[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [filterStatus, setFilterStatus] = useState('all');
  const [searchTerm, setSearchTerm] = useState('');
  const [validatingId, setValidatingId] = useState<string | null>(null);
  const [deletingId, setDeletingId] = useState<string | null>(null);
  const [openMenuId, setOpenMenuId] = useState<string | null>(null);
  const [menuPosition, setMenuPosition] = useState<{ top: number; left: number } | null>(null);
  const [selectedBooking, setSelectedBooking] = useState<Booking | null>(null);
  const [showDetailsModal, setShowDetailsModal] = useState(false);

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

  const handleDeleteBooking = async (bookingId: string) => {
    if (!window.confirm('Supprimer définitivement cette réservation ?')) return;
    setDeletingId(bookingId);
    try {
      await deleteAdminBooking(bookingId);
      setBookings(prev => prev.filter(b => b.id !== bookingId));
    } catch (err: any) {
      setError(err.message || 'Erreur lors de la suppression');
    } finally {
      setDeletingId(null);
    }
  };

  const handleValidateTransfer = async (bookingId: string) => {
    if (!window.confirm('Confirmer la réception du virement et activer ce booking ?')) return;
    setValidatingId(bookingId);
    try {
      await validateBankTransfer(bookingId);
      await fetchBookings();
    } catch (err: any) {
      setError(err.message || 'Erreur lors de la validation du virement');
    } finally {
      setValidatingId(null);
    }
  };

  const fetchBookings = async () => {
    try {
      setLoading(true);
      const response = await getAllBookings();
      setBookings(response.bookings || []);
      setError(null);
    } catch (err: any) {
      setError(err.message || 'Impossible de charger les réservations');
    } finally {
      setLoading(false);
    }
  };

  const getStatusColor = (status: string) => {
    const colors: Record<string, string> = {
      pending_payment: 'bg-orange-100 text-orange-800',
      pending_bank_transfer: 'bg-amber-100 text-amber-900',
      pending: 'bg-yellow-100 text-yellow-800',
      accepted: 'bg-green-100 text-green-800',
      rejected: 'bg-red-100 text-red-800',
      cancelled: 'bg-red-100 text-red-800',
    };
    return colors[status.toLowerCase()] || 'bg-gray-100 text-gray-800';
  };

  const getStatusLabel = (status: string) => {
    const labels: Record<string, string> = {
      PENDING_PAYMENT: 'Paiement en attente',
      PENDING_BANK_TRANSFER: 'Virement à valider',
      PENDING: 'En attente transporteur',
      ACCEPTED: 'Accepté',
      REJECTED: 'Rejeté',
      CANCELLED: 'Annulé',
    };
    return labels[status.toUpperCase()] || status;
  };

  const getShortId = (booking: Booking) => `#${booking.id.slice(0, 8).toUpperCase()}`;

  const filteredBookings = bookings
    .filter(booking => filterStatus === 'all' || booking.status.toLowerCase() === filterStatus)
    .filter(booking => {
      if (searchTerm === '') return true;
      const s = searchTerm.toLowerCase();
      return (
        booking.bookingNumber?.toLowerCase().includes(s) ||
        booking.id.toLowerCase().includes(s) ||
        booking.carrierName?.toLowerCase().includes(s) ||
        booking.origin?.toLowerCase().includes(s) ||
        booking.destination?.toLowerCase().includes(s) ||
        String(booking.palletCount || '').includes(s) ||
        String(booking.weightKG || '').includes(s) ||
        String(booking.volumeCBM || '').includes(s) ||
        booking.containerType?.toLowerCase().includes(s)
      );
    });

  if (loading) {
    return (
      <div className="flex items-center justify-center h-96">
        <div className="text-center">
          <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-600 mx-auto"></div>
          <p className="mt-4 text-gray-600">Chargement des réservations...</p>
        </div>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div>
        <h1 className="text-2xl font-bold text-gray-900">Gestion des réservations</h1>
        <p className="mt-1 text-sm text-gray-500">
          Toutes les réservations de la plateforme
        </p>
      </div>

      {/* Stats Cards */}
      <div className="grid grid-cols-2 md:grid-cols-5 gap-4">
        <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-4">
          <div className="text-xs text-gray-500 uppercase tracking-wide">Total</div>
          <div className="text-2xl font-bold text-gray-900 mt-1">{bookings.length}</div>
        </div>
        <div className="bg-amber-50 rounded-lg shadow-sm border border-amber-200 p-4">
          <div className="text-xs text-amber-700 uppercase tracking-wide">Virements à valider</div>
          <div className="text-2xl font-bold text-amber-700 mt-1">
            {bookings.filter(b => b.status.toUpperCase() === 'PENDING_BANK_TRANSFER').length}
          </div>
        </div>
        <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-4">
          <div className="text-xs text-gray-500 uppercase tracking-wide">En attente transporteur</div>
          <div className="text-2xl font-bold text-yellow-600 mt-1">
            {bookings.filter(b => b.status.toUpperCase() === 'PENDING').length}
          </div>
        </div>
        <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-4">
          <div className="text-xs text-gray-500 uppercase tracking-wide">Acceptées</div>
          <div className="text-2xl font-bold text-green-600 mt-1">
            {bookings.filter(b => b.status.toUpperCase() === 'ACCEPTED').length}
          </div>
        </div>
        <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-4">
          <div className="text-xs text-gray-500 uppercase tracking-wide">Rejetées</div>
          <div className="text-2xl font-bold text-red-600 mt-1">
            {bookings.filter(b => b.status.toUpperCase() === 'REJECTED').length}
          </div>
        </div>
      </div>

      {/* Filters */}
      <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-4">
        <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Recherche</label>
            <input
              type="text"
              placeholder="N° booking, transporteur, route, palettes, poids, CBM..."
              value={searchTerm}
              onChange={e => setSearchTerm(e.target.value)}
              className="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:border-blue-500 focus:ring-blue-500 focus:outline-none text-sm"
            />
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Statut</label>
            <select
              value={filterStatus}
              onChange={e => setFilterStatus(e.target.value)}
              className="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:border-blue-500 focus:ring-blue-500 focus:outline-none text-sm"
            >
              <option value="all">Tous les statuts</option>
              <option value="pending_bank_transfer">Virement à valider</option>
              <option value="pending_payment">Paiement en attente</option>
              <option value="pending">En attente transporteur</option>
              <option value="accepted">Accepté</option>
              <option value="rejected">Rejeté</option>
              <option value="cancelled">Annulé</option>
            </select>
          </div>
        </div>
      </div>

      {/* Error Message */}
      {error && (
        <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded-lg text-sm">
          {error}
        </div>
      )}

      {/* Bookings Table */}
      <div className="bg-white rounded-lg shadow overflow-hidden">
        <div className="overflow-x-auto">
          <table className="min-w-full divide-y divide-gray-200">
            <thead className="bg-gray-50">
              <tr>
                <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                  N° Booking
                </th>
                <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                  Route
                </th>
                <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                  Cargo
                </th>
                <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                  Transporteur
                </th>
                <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                  Statut
                </th>
                <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                  Date
                </th>
                <th className="px-4 py-3 text-right text-xs font-medium text-gray-500 uppercase tracking-wider">
                  Actions
                </th>
              </tr>
            </thead>
            <tbody className="bg-white divide-y divide-gray-200">
              {filteredBookings.length === 0 ? (
                <tr>
                  <td colSpan={7} className="px-4 py-8 text-center text-sm text-gray-500">
                    Aucune réservation trouvée
                  </td>
                </tr>
              ) : (
                filteredBookings.map(booking => (
                  <tr key={booking.id} className="hover:bg-gray-50">
                    {/* N° Booking */}
                    <td className="px-4 py-4 whitespace-nowrap">
                      {booking.bookingNumber && (
                        <div className="text-sm font-semibold text-gray-900">{booking.bookingNumber}</div>
                      )}
                      <div className="text-xs text-gray-400 font-mono">{getShortId(booking)}</div>
                    </td>

                    {/* Route */}
                    <td className="px-4 py-4 whitespace-nowrap">
                      <div className="text-sm font-medium text-gray-900">
                        {booking.origin} → {booking.destination}
                      </div>
                    </td>

                    {/* Cargo */}
                    <td className="px-4 py-4 whitespace-nowrap">
                      <div className="text-sm text-gray-900">
                        {booking.containerType}
                        {booking.palletCount != null && (
                          <span className="ml-1 text-gray-500">· {booking.palletCount} pal.</span>
                        )}
                      </div>
                      <div className="text-xs text-gray-500 space-x-2">
                        {booking.weightKG != null && <span>{booking.weightKG.toLocaleString()} kg</span>}
                        {booking.volumeCBM != null && <span>{booking.volumeCBM} CBM</span>}
                      </div>
                    </td>

                    {/* Transporteur */}
                    <td className="px-4 py-4 whitespace-nowrap text-sm text-gray-900">
                      {booking.carrierName || '—'}
                    </td>

                    {/* Statut */}
                    <td className="px-4 py-4 whitespace-nowrap">
                      <span className={`px-2 py-0.5 inline-flex text-xs leading-5 font-semibold rounded-full ${getStatusColor(booking.status)}`}>
                        {getStatusLabel(booking.status)}
                      </span>
                    </td>

                    {/* Date */}
                    <td className="px-4 py-4 whitespace-nowrap text-sm text-gray-500">
                      {new Date(booking.requestedAt || booking.createdAt || '').toLocaleDateString('fr-FR')}
                    </td>

                    {/* Actions */}
                    <td className="px-4 py-4 whitespace-nowrap text-right text-sm">
                      <button
                        onClick={(e) => {
                          if (openMenuId === booking.id) {
                            setOpenMenuId(null);
                            setMenuPosition(null);
                          } else {
                            const rect = e.currentTarget.getBoundingClientRect();
                            setMenuPosition({ top: rect.bottom + 5, left: rect.left - 180 });
                            setOpenMenuId(booking.id);
                          }
                        }}
                        className="p-2 hover:bg-gray-100 rounded-lg transition-colors"
                      >
                        <svg className="w-5 h-5 text-gray-600" fill="currentColor" viewBox="0 0 20 20">
                          <path d="M10 6a2 2 0 110-4 2 2 0 010 4zM10 12a2 2 0 110-4 2 2 0 010 4zM10 18a2 2 0 110-4 2 2 0 010 4z" />
                        </svg>
                      </button>
                    </td>
                  </tr>
                ))
              )}
            </tbody>
          </table>
        </div>
      </div>
      {/* Actions Dropdown Menu */}
      {openMenuId && menuPosition && (
        <>
          <div
            className="fixed inset-0 z-[998]"
            onClick={() => { setOpenMenuId(null); setMenuPosition(null); }}
          />
          <div
            className="fixed w-56 bg-white border-2 border-gray-300 rounded-lg shadow-2xl z-[999]"
            style={{ top: `${menuPosition.top}px`, left: `${menuPosition.left}px` }}
          >
            <div className="py-2">
              <button
                onClick={() => {
                  const booking = bookings.find(b => b.id === openMenuId);
                  if (booking) {
                    setSelectedBooking(booking);
                    setShowDetailsModal(true);
                  }
                  setOpenMenuId(null);
                  setMenuPosition(null);
                }}
                className="w-full px-4 py-3 text-left hover:bg-gray-50 flex items-center space-x-3 border-b border-gray-200"
              >
                <svg className="w-5 h-5 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z" />
                </svg>
                <span className="text-sm font-medium text-gray-700">Voir les détails</span>
              </button>
              {(() => {
                const booking = bookings.find(b => b.id === openMenuId);
                return booking?.status.toUpperCase() === 'PENDING_BANK_TRANSFER' ? (
                  <button
                    onClick={() => {
                      const id = openMenuId;
                      setOpenMenuId(null);
                      setMenuPosition(null);
                      if (id) handleValidateTransfer(id);
                    }}
                    disabled={validatingId === openMenuId}
                    className="w-full px-4 py-3 text-left hover:bg-green-50 disabled:opacity-50 disabled:cursor-not-allowed flex items-center space-x-3 border-b border-gray-200"
                  >
                    <svg className="w-5 h-5 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z" />
                    </svg>
                    <span className="text-sm font-medium text-green-700">Valider virement</span>
                  </button>
                ) : null;
              })()}
              <button
                onClick={() => {
                  const id = openMenuId;
                  setOpenMenuId(null);
                  setMenuPosition(null);
                  if (id) handleDeleteBooking(id);
                }}
                disabled={deletingId === openMenuId}
                className="w-full px-4 py-3 text-left hover:bg-red-50 disabled:opacity-50 disabled:cursor-not-allowed flex items-center space-x-3"
              >
                <svg className="w-5 h-5 text-red-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
                </svg>
                <span className="text-sm font-medium text-red-600">Supprimer</span>
              </button>
            </div>
          </div>
        </>
      )}

      {/* Details Modal */}
      {showDetailsModal && selectedBooking && (
        <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 overflow-y-auto p-4">
          <div className="bg-white rounded-lg p-6 max-w-2xl w-full">
            <div className="flex items-center justify-between mb-6">
              <h2 className="text-xl font-bold text-gray-900">Détails de la réservation</h2>
              <button
                onClick={() => { setShowDetailsModal(false); setSelectedBooking(null); }}
                className="text-gray-400 hover:text-gray-600"
              >
                <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                </svg>
              </button>
            </div>

            <div className="space-y-4">
              <div className="grid grid-cols-2 gap-4">
                <div>
                  <label className="block text-sm font-medium text-gray-500">N° Booking</label>
                  <div className="mt-1 text-lg font-semibold text-gray-900">
                    {selectedBooking.bookingNumber || getShortId(selectedBooking)}
                  </div>
                </div>
                <div>
                  <label className="block text-sm font-medium text-gray-500">Statut</label>
                  <span className={`mt-1 inline-block px-3 py-1 text-sm font-semibold rounded-full ${getStatusColor(selectedBooking.status)}`}>
                    {getStatusLabel(selectedBooking.status)}
                  </span>
                </div>
              </div>

              <div className="border-t pt-4">
                <h3 className="text-sm font-medium text-gray-900 mb-3">Route</h3>
                <div className="grid grid-cols-2 gap-4">
                  <div>
                    <label className="block text-sm font-medium text-gray-500">Origine</label>
                    <div className="mt-1 font-semibold text-gray-900">{selectedBooking.origin || '—'}</div>
                  </div>
                  <div>
                    <label className="block text-sm font-medium text-gray-500">Destination</label>
                    <div className="mt-1 font-semibold text-gray-900">{selectedBooking.destination || '—'}</div>
                  </div>
                </div>
              </div>

              <div className="border-t pt-4">
                <h3 className="text-sm font-medium text-gray-900 mb-3">Cargo & Transporteur</h3>
                <div className="grid grid-cols-2 gap-4">
                  <div>
                    <label className="block text-sm font-medium text-gray-500">Transporteur</label>
                    <div className="mt-1 font-semibold text-gray-900">{selectedBooking.carrierName || '—'}</div>
                  </div>
                  <div>
                    <label className="block text-sm font-medium text-gray-500">Type conteneur</label>
                    <div className="mt-1 font-semibold text-gray-900">{selectedBooking.containerType}</div>
                  </div>
                  {selectedBooking.palletCount != null && (
                    <div>
                      <label className="block text-sm font-medium text-gray-500">Palettes</label>
                      <div className="mt-1 font-semibold text-gray-900">{selectedBooking.palletCount}</div>
                    </div>
                  )}
                  {selectedBooking.weightKG != null && (
                    <div>
                      <label className="block text-sm font-medium text-gray-500">Poids</label>
                      <div className="mt-1 font-semibold text-gray-900">{selectedBooking.weightKG.toLocaleString()} kg</div>
                    </div>
                  )}
                  {selectedBooking.volumeCBM != null && (
                    <div>
                      <label className="block text-sm font-medium text-gray-500">Volume</label>
                      <div className="mt-1 font-semibold text-gray-900">{selectedBooking.volumeCBM} CBM</div>
                    </div>
                  )}
                </div>
              </div>

              {(selectedBooking.priceEUR != null || selectedBooking.priceUSD != null) && (
                <div className="border-t pt-4">
                  <h3 className="text-sm font-medium text-gray-900 mb-3">Prix</h3>
                  <div className="grid grid-cols-2 gap-4">
                    {selectedBooking.priceEUR != null && (
                      <div>
                        <label className="block text-sm font-medium text-gray-500">EUR</label>
                        <div className="mt-1 text-xl font-bold text-blue-600">{selectedBooking.priceEUR.toLocaleString()} €</div>
                      </div>
                    )}
                    {selectedBooking.priceUSD != null && (
                      <div>
                        <label className="block text-sm font-medium text-gray-500">USD</label>
                        <div className="mt-1 text-xl font-bold text-blue-600">{selectedBooking.priceUSD.toLocaleString()} $</div>
                      </div>
                    )}
                  </div>
                </div>
              )}

              <div className="border-t pt-4">
                <h3 className="text-sm font-medium text-gray-900 mb-3">Dates</h3>
                <div className="grid grid-cols-2 gap-4 text-sm">
                  <div>
                    <label className="block text-gray-500">Créée le</label>
                    <div className="mt-1 text-gray-900">
                      {new Date(selectedBooking.requestedAt || selectedBooking.createdAt || '').toLocaleString('fr-FR')}
                    </div>
                  </div>
                  {selectedBooking.updatedAt && (
                    <div>
                      <label className="block text-gray-500">Mise à jour</label>
                      <div className="mt-1 text-gray-900">{new Date(selectedBooking.updatedAt).toLocaleString('fr-FR')}</div>
                    </div>
                  )}
                </div>
              </div>

              {selectedBooking.status.toUpperCase() === 'PENDING_BANK_TRANSFER' && (
                <div className="border-t pt-4">
                  <button
                    onClick={() => {
                      setShowDetailsModal(false);
                      setSelectedBooking(null);
                      handleValidateTransfer(selectedBooking.id);
                    }}
                    disabled={validatingId === selectedBooking.id}
                    className="w-full px-4 py-2 bg-green-600 text-white font-semibold rounded-lg hover:bg-green-700 disabled:opacity-50 disabled:cursor-not-allowed"
                  >
                    {validatingId === selectedBooking.id ? 'Validation...' : '✓ Valider le virement'}
                  </button>
                </div>
              )}
            </div>

            <div className="flex justify-end mt-6 pt-4 border-t">
              <button
                onClick={() => { setShowDetailsModal(false); setSelectedBooking(null); }}
                className="px-4 py-2 border border-gray-300 rounded-md text-gray-700 hover:bg-gray-50"
              >
                Fermer
              </button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}