'use client';

import { useState, useEffect } from 'react';
import { useQuery } from '@tanstack/react-query';
import { listCsvBookings } from '@/lib/api';
import { Link } from '@/i18n/navigation';
import { Plus, Clock } from 'lucide-react';
import ExportButton from '@/components/ExportButton';
import { useSearchParams } from 'next/navigation';
import { PageHeader } from '@/components/ui/PageHeader';
import { useTranslations, useLocale } from 'next-intl';

type SearchType = 'pallets' | 'weight' | 'route' | 'status' | 'date' | 'quote';

export default function BookingsListPage() {
  const t = useTranslations('dashboard.bookingsList');
  const locale = useLocale();
  const dateLocale = locale === 'fr' ? 'fr-FR' : 'en-US';
  const searchParams = useSearchParams();
  const [searchTerm, setSearchTerm] = useState('');
  const [searchType, setSearchType] = useState<SearchType>('route');
  const [statusFilter, setStatusFilter] = useState('');
  const [page, setPage] = useState(1);
  const [showTransferBanner, setShowTransferBanner] = useState(false);
  const ITEMS_PER_PAGE = 20;

  useEffect(() => {
    if (searchParams.get('transfer') === 'declared') {
      setShowTransferBanner(true);
    }
  }, [searchParams]);

  const {
    data: csvData,
    isLoading,
    error: csvError,
  } = useQuery({
    queryKey: ['csv-bookings'],
    queryFn: () =>
      listCsvBookings({
        page: 1,
        limit: 1000,
      }),
  });

  if (csvError) console.error('CSV bookings error:', csvError);

  const filterBookings = (bookings: any[]) => {
    let filtered = bookings;

    if (statusFilter) {
      filtered = filtered.filter((booking: any) => booking.status === statusFilter);
    }

    if (searchTerm.trim()) {
      const term = searchTerm.toLowerCase();

      filtered = filtered.filter((booking: any) => {
        switch (searchType) {
          case 'pallets':
            return booking.palletCount?.toString().includes(term);
          case 'weight':
            return booking.weightKG?.toString().includes(term);
          case 'route':
            const origin = booking.originCity?.toLowerCase() || '';
            const destination = booking.destinationCity?.toLowerCase() || '';
            return origin.includes(term) || destination.includes(term);
          case 'status':
            return booking.status?.toLowerCase().includes(term);
          case 'date':
            const date = new Date(
              booking.requestedPickupDate || booking.requestedAt
            ).toLocaleDateString(dateLocale);
            return date.includes(term);
          case 'quote':
            return (
              booking.id?.toLowerCase().includes(term) ||
              booking.quoteNumber?.toLowerCase().includes(term)
            );
          default:
            return true;
        }
      });
    }

    return filtered;
  };

  const filteredBookings = filterBookings(
    (csvData?.bookings || []).map(b => ({ ...b, type: 'csv' as const }))
  );

  const totalBookings = filteredBookings.length;
  const totalPages = Math.ceil(totalBookings / ITEMS_PER_PAGE);
  const startIndex = (page - 1) * ITEMS_PER_PAGE;
  const endIndex = startIndex + ITEMS_PER_PAGE;
  const paginatedBookings = filteredBookings.slice(startIndex, endIndex);

  const resetPage = () => setPage(1);

  const statusOptions = [
    { value: '', label: t('statusFilter.all') },
    { value: 'PENDING', label: t('status.pending') },
    { value: 'ACCEPTED', label: t('status.accepted') },
    { value: 'REJECTED', label: t('status.rejected') },
  ];

  const searchTypeOptions: { value: SearchType; label: string }[] = [
    { value: 'route', label: t('searchType.route') },
    { value: 'pallets', label: t('searchType.pallets') },
    { value: 'weight', label: t('searchType.weight') },
    { value: 'status', label: t('searchType.status') },
    { value: 'date', label: t('searchType.date') },
    { value: 'quote', label: t('searchType.quote') },
  ];

  const getPlaceholder = () => {
    const keyMap: Record<SearchType, string> = {
      route: 'searchPlaceholder.route',
      pallets: 'searchPlaceholder.pallets',
      weight: 'searchPlaceholder.weight',
      status: 'searchPlaceholder.status',
      date: 'searchPlaceholder.date',
      quote: 'searchPlaceholder.quote',
    };
    return t(keyMap[searchType] as any);
  };

  const getStatusColor = (status: string) => {
    const colors: Record<string, string> = {
      PENDING: 'bg-yellow-100 text-yellow-800',
      ACCEPTED: 'bg-green-100 text-green-800',
      REJECTED: 'bg-red-100 text-red-800',
    };
    return colors[status] || 'bg-gray-100 text-gray-800';
  };

  const getStatusLabel = (status: string) => {
    const map: Record<string, string> = {
      PENDING: t('status.pending'),
      ACCEPTED: t('status.accepted'),
      REJECTED: t('status.rejected'),
    };
    return map[status] || status;
  };

  return (
    <div className="space-y-6">
      {showTransferBanner && (
        <div className="bg-amber-50 border border-amber-200 rounded-lg p-4 flex items-start justify-between">
          <div className="flex items-start space-x-3">
            <Clock className="h-5 w-5 text-amber-600 flex-shrink-0 mt-0.5" />
            <div>
              <p className="font-medium text-amber-800">{t('transferBanner.title')}</p>
              <p className="text-sm text-amber-700 mt-0.5">{t('transferBanner.message')}</p>
            </div>
          </div>
          <button
            onClick={() => setShowTransferBanner(false)}
            className="text-amber-500 hover:text-amber-700 ml-4 flex-shrink-0"
          >
            ✕
          </button>
        </div>
      )}
      <PageHeader
        title={t('title')}
        description={t('description')}
        actions={
          <>
            <ExportButton
              data={filteredBookings}
              filename={t('exportFilename')}
              columns={[
                { key: 'id', label: t('export.id') },
                { key: 'palletCount', label: t('export.pallets'), format: v => `${v || 0}` },
                { key: 'weightKG', label: t('export.weight'), format: v => `${v || 0}` },
                { key: 'volumeCBM', label: t('export.volume'), format: v => `${v || 0}` },
                { key: 'origin', label: t('export.origin') },
                { key: 'destination', label: t('export.destination') },
                { key: 'carrierName', label: t('export.carrier') },
                { key: 'status', label: t('export.status'), format: v => getStatusLabel(v) },
                {
                  key: 'createdAt',
                  label: t('export.createdAt'),
                  format: v => (v ? new Date(v).toLocaleDateString(dateLocale) : ''),
                },
              ]}
            />
            <Link
              href="/dashboard/search-advanced"
              className="inline-flex items-center px-3 sm:px-4 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700"
            >
              <Plus className="h-4 w-4 sm:mr-2" />
              <span className="hidden sm:inline">{t('new')}</span>
            </Link>
          </>
        }
      />

      <div className="bg-white rounded-lg shadow p-4">
        <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
          <div>
            <label htmlFor="searchType" className="sr-only">
              {t('searchType.label')}
            </label>
            <select
              id="searchType"
              value={searchType}
              onChange={e => {
                setSearchType(e.target.value as SearchType);
                resetPage();
              }}
              className="block w-full pl-3 pr-10 py-2 text-base border-gray-300 focus:outline-none focus:ring-blue-500 focus:border-blue-500 sm:text-sm rounded-md"
            >
              {searchTypeOptions.map(option => (
                <option key={option.value} value={option.value}>
                  {option.label}
                </option>
              ))}
            </select>
          </div>
          <div className="md:col-span-2">
            <label htmlFor="search" className="sr-only">
              {t('search')}
            </label>
            <div className="relative">
              <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
                <svg
                  className="h-5 w-5 text-gray-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>
              </div>
              <input
                type="text"
                id="search"
                value={searchTerm}
                onChange={e => {
                  setSearchTerm(e.target.value);
                  resetPage();
                }}
                className="block w-full pl-10 pr-3 py-2 border border-gray-300 rounded-md leading-5 bg-white placeholder-gray-500 focus:outline-none focus:placeholder-gray-400 focus:ring-1 focus:ring-blue-500 focus:border-blue-500 sm:text-sm"
                placeholder={getPlaceholder()}
              />
            </div>
          </div>
          <div>
            <label htmlFor="status" className="sr-only">
              {t('statusFilter.label')}
            </label>
            <select
              id="status"
              value={statusFilter}
              onChange={e => {
                setStatusFilter(e.target.value);
                resetPage();
              }}
              className="block w-full pl-3 pr-10 py-2 text-base border-gray-300 focus:outline-none focus:ring-blue-500 focus:border-blue-500 sm:text-sm rounded-md"
            >
              {statusOptions.map(option => (
                <option key={option.value} value={option.value}>
                  {option.label}
                </option>
              ))}
            </select>
          </div>
        </div>
      </div>

      <div className="bg-white rounded-lg shadow overflow-hidden">
        {isLoading ? (
          <div className="px-6 py-12 text-center text-gray-500">
            <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-600 mx-auto mb-4"></div>
            {t('loading')}
          </div>
        ) : paginatedBookings && paginatedBookings.length > 0 ? (
          <>
            <div className="md:hidden divide-y divide-gray-200">
              {paginatedBookings.map((booking: any) => (
                <div key={`${booking.type}-${booking.id}`} className="p-4 space-y-3">
                  <div className="flex items-start justify-between">
                    <div>
                      <div className="text-sm font-semibold text-gray-900">
                        {booking.type === 'csv'
                          ? `${booking.origin} → ${booking.destination}`
                          : booking.route || 'N/A'}
                      </div>
                      <div className="text-xs text-gray-500 mt-0.5">
                        {booking.type === 'csv' ? booking.carrierName : booking.carrier || ''}
                      </div>
                    </div>
                    <span
                      className={`px-2 py-1 text-xs font-semibold rounded-full flex-shrink-0 ${getStatusColor(booking.status)}`}
                    >
                      {getStatusLabel(booking.status)}
                    </span>
                  </div>
                  <div className="grid grid-cols-3 gap-2 text-xs">
                    <div>
                      <div className="text-gray-400 uppercase tracking-wide">
                        {t('mobile.pallets')}
                      </div>
                      <div className="font-medium text-gray-900 mt-0.5">
                        {booking.type === 'csv'
                          ? t('units.palletsShort', { count: booking.palletCount })
                          : t('units.containersShort', { count: booking.containers?.length || 0 })}
                      </div>
                    </div>
                    <div>
                      <div className="text-gray-400 uppercase tracking-wide">
                        {t('mobile.weight')}
                      </div>
                      <div className="font-medium text-gray-900 mt-0.5">
                        {booking.type === 'csv'
                          ? t('units.kg', { value: booking.weightKG })
                          : booking.totalWeight
                            ? t('units.kg', { value: booking.totalWeight })
                            : 'N/A'}
                      </div>
                    </div>
                    <div>
                      <div className="text-gray-400 uppercase tracking-wide">
                        {t('mobile.date')}
                      </div>
                      <div className="font-medium text-gray-900 mt-0.5">
                        {booking.createdAt || booking.requestedAt
                          ? new Date(booking.createdAt || booking.requestedAt).toLocaleDateString(
                              dateLocale,
                              { day: '2-digit', month: '2-digit', year: '2-digit' }
                            )
                          : 'N/A'}
                      </div>
                    </div>
                  </div>
                  <div className="text-xs text-gray-400">
                    {booking.type === 'csv'
                      ? t('mobile.ref', {
                          id: booking.bookingId || booking.id.slice(0, 8).toUpperCase(),
                        })
                      : t('mobile.booking', { number: booking.bookingNumber || '-' })}
                  </div>
                </div>
              ))}
            </div>

            <div className="hidden md:block overflow-x-auto">
              <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">
                      {t('columns.palletsPackages')}
                    </th>
                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                      {t('columns.weight')}
                    </th>
                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                      {t('columns.route')}
                    </th>
                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                      {t('columns.status')}
                    </th>
                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                      {t('columns.date')}
                    </th>
                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                      {t('columns.quoteNumber')}
                    </th>
                    <th className="px-6 py-3 text-right text-xs font-medium text-gray-500 uppercase tracking-wider">
                      {t('columns.bookingNumber')}
                    </th>
                  </tr>
                </thead>
                <tbody className="bg-white divide-y divide-gray-200">
                  {paginatedBookings.map((booking: any) => (
                    <tr key={`${booking.type}-${booking.id}`} className="hover:bg-gray-50">
                      <td className="px-6 py-4 whitespace-nowrap">
                        <div className="text-sm font-medium text-gray-900">
                          {booking.type === 'csv'
                            ? t('units.palletsCount', { count: booking.palletCount })
                            : t('units.containersCount', {
                                count: booking.containers?.length || 0,
                              })}
                        </div>
                        <div className="text-xs text-gray-500">
                          {booking.type === 'csv' ? 'LCL' : booking.containerType || 'FCL'}
                        </div>
                      </td>
                      <td className="px-6 py-4 whitespace-nowrap">
                        <div className="text-sm font-medium text-gray-900">
                          {booking.type === 'csv'
                            ? t('units.kg', { value: booking.weightKG })
                            : booking.totalWeight
                              ? t('units.kg', { value: booking.totalWeight })
                              : 'N/A'}
                        </div>
                        <div className="text-xs text-gray-500">
                          {booking.type === 'csv'
                            ? t('units.cbm', { value: booking.volumeCBM })
                            : booking.totalVolume
                              ? t('units.cbm', { value: booking.totalVolume })
                              : ''}
                        </div>
                      </td>
                      <td className="px-6 py-4">
                        <div className="text-sm text-gray-900">
                          {booking.type === 'csv'
                            ? `${booking.origin} → ${booking.destination}`
                            : booking.route || 'N/A'}
                        </div>
                        <div className="text-sm text-gray-500">
                          {booking.type === 'csv'
                            ? `${booking.carrierName}`
                            : booking.carrier || ''}
                        </div>
                      </td>
                      <td className="px-6 py-4 whitespace-nowrap">
                        <span
                          className={`px-2 py-1 inline-flex text-xs leading-5 font-semibold rounded-full ${getStatusColor(
                            booking.status
                          )}`}
                        >
                          {getStatusLabel(booking.status)}
                        </span>
                      </td>
                      <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">
                        {booking.createdAt || booking.requestedAt
                          ? new Date(booking.createdAt || booking.requestedAt).toLocaleDateString(
                              dateLocale,
                              {
                                day: '2-digit',
                                month: '2-digit',
                                year: 'numeric',
                              }
                            )
                          : 'N/A'}
                      </td>
                      <td className="px-6 py-4 whitespace-nowrap text-left text-sm font-medium">
                        {booking.type === 'csv'
                          ? `#${booking.bookingId || booking.id.slice(0, 8).toUpperCase()}`
                          : booking.bookingNumber || `#${booking.id.slice(0, 8).toUpperCase()}`}
                      </td>
                      <td className="px-6 py-4 whitespace-nowrap text-right text-sm font-medium text-brand-navy">
                        {booking.bookingNumber || '-'}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>

            {totalPages > 1 && (
              <div className="bg-white px-4 py-3 flex items-center justify-between border-t border-gray-200 sm:px-6">
                <div className="flex-1 flex justify-between sm:hidden">
                  <button
                    onClick={() => setPage(page - 1)}
                    disabled={page === 1}
                    className="relative inline-flex items-center px-4 py-2 border border-gray-300 text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50 disabled:bg-gray-100 disabled:text-gray-400 disabled:cursor-not-allowed"
                  >
                    {t('pagination.previous')}
                  </button>
                  <button
                    onClick={() => setPage(page + 1)}
                    disabled={page >= totalPages}
                    className="ml-3 relative inline-flex items-center px-4 py-2 border border-gray-300 text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50 disabled:bg-gray-100 disabled:text-gray-400 disabled:cursor-not-allowed"
                  >
                    {t('pagination.next')}
                  </button>
                </div>
                <div className="hidden sm:flex-1 sm:flex sm:items-center sm:justify-between">
                  <div>
                    <p className="text-sm text-gray-700">
                      {t.rich('pagination.showing', {
                        start: startIndex + 1,
                        end: Math.min(endIndex, totalBookings),
                        total: totalBookings,
                        b: chunks => <span className="font-medium">{chunks}</span>,
                      })}
                    </p>
                  </div>
                  <div>
                    <nav
                      className="relative z-0 inline-flex rounded-md shadow-sm -space-x-px"
                      aria-label="Pagination"
                    >
                      <button
                        onClick={() => setPage(page - 1)}
                        disabled={page === 1}
                        className="relative inline-flex items-center px-2 py-2 rounded-l-md border border-gray-300 bg-white text-sm font-medium text-gray-500 hover:bg-gray-50 disabled:bg-gray-100 disabled:text-gray-400 disabled:cursor-not-allowed"
                      >
                        <span className="sr-only">{t('pagination.previous')}</span>
                        <svg className="h-5 w-5" fill="currentColor" viewBox="0 0 20 20">
                          <path
                            fillRule="evenodd"
                            d="M12.707 5.293a1 1 0 010 1.414L9.414 10l3.293 3.293a1 1 0 01-1.414 1.414l-4-4a1 1 0 010-1.414l4-4a1 1 0 011.414 0z"
                            clipRule="evenodd"
                          />
                        </svg>
                      </button>

                      {[...Array(totalPages)].map((_, idx) => {
                        const pageNum = idx + 1;
                        const showPage =
                          pageNum === 1 ||
                          pageNum === totalPages ||
                          (pageNum >= page - 1 && pageNum <= page + 1);

                        if (!showPage && pageNum === 2) {
                          return (
                            <span
                              key={pageNum}
                              className="relative inline-flex items-center px-4 py-2 border border-gray-300 bg-white text-sm font-medium text-gray-700"
                            >
                              ...
                            </span>
                          );
                        }
                        if (!showPage && pageNum === totalPages - 1) {
                          return (
                            <span
                              key={pageNum}
                              className="relative inline-flex items-center px-4 py-2 border border-gray-300 bg-white text-sm font-medium text-gray-700"
                            >
                              ...
                            </span>
                          );
                        }
                        if (!showPage) return null;

                        return (
                          <button
                            key={pageNum}
                            onClick={() => setPage(pageNum)}
                            className={`relative inline-flex items-center px-4 py-2 border text-sm font-medium ${
                              page === pageNum
                                ? 'z-10 bg-blue-50 border-blue-500 text-blue-600'
                                : 'bg-white border-gray-300 text-gray-500 hover:bg-gray-50'
                            }`}
                          >
                            {pageNum}
                          </button>
                        );
                      })}

                      <button
                        onClick={() => setPage(page + 1)}
                        disabled={page >= totalPages}
                        className="relative inline-flex items-center px-2 py-2 rounded-r-md border border-gray-300 bg-white text-sm font-medium text-gray-500 hover:bg-gray-50 disabled:bg-gray-100 disabled:text-gray-400 disabled:cursor-not-allowed"
                      >
                        <span className="sr-only">{t('pagination.next')}</span>
                        <svg className="h-5 w-5" fill="currentColor" viewBox="0 0 20 20">
                          <path
                            fillRule="evenodd"
                            d="M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z"
                            clipRule="evenodd"
                          />
                        </svg>
                      </button>
                    </nav>
                  </div>
                </div>
              </div>
            )}
          </>
        ) : (
          <div className="px-6 py-12 text-center">
            <svg
              className="mx-auto h-12 w-12 text-gray-400"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2}
                d="M20 13V6a2 2 0 00-2-2H6a2 2 0 00-2 2v7m16 0v5a2 2 0 01-2 2H6a2 2 0 01-2-2v-5m16 0h-2.586a1 1 0 00-.707.293l-2.414 2.414a1 1 0 01-.707.293h-3.172a1 1 0 01-.707-.293l-2.414-2.414A1 1 0 006.586 13H4"
              />
            </svg>
            <h3 className="mt-2 text-sm font-medium text-gray-900">{t('empty.title')}</h3>
            <p className="mt-1 text-sm text-gray-500">
              {searchTerm || statusFilter ? t('empty.hasFilters') : t('empty.noBookings')}
            </p>
            <div className="mt-6">
              <Link
                href="/dashboard/search-advanced"
                className="inline-flex items-center px-4 py-2 border border-transparent shadow-sm text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700"
              >
                <Plus className="mr-2 h-4 w-4" />
                {t('new')}
              </Link>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}