'use client';

import { useEffect, useMemo, useState } from 'react';
import { useQuery } from '@tanstack/react-query';
import { useSearchParams } from 'next/navigation';
import { useLocale, useTranslations } from 'next-intl';
import type { ColumnDef } from '@tanstack/react-table';
import { CreditCard, Eye, MoreVertical, Package, Pencil, Plus, Sparkles, X } from 'lucide-react';

import { listCsvBookings } from '@/lib/api';
import { Link } from '@/i18n/navigation';
import { PageHeader } from '@/components/ui/PageHeader';
import { Button } from '@/components/ui/button';
import { Callout } from '@/components/ui/callout';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { DataTable } from '@/components/data/data-table';
import { FilterBar, type ActiveFilter } from '@/components/data/filter-bar';
import { SearchInput } from '@/components/data/search-input';
import { BookingDetailDialog } from '@/components/bookings/BookingDetailDialog';
import {
  BookingStatusBadge,
  useBookingStatusLabel,
} from '@/components/bookings/BookingStatusBadge';
import ExportButton from '@/components/ExportButton';
import { useReservationQuota } from '@/hooks/useReservationQuota';
import { useUrlState } from '@/hooks/use-url-state';

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

// Statuts consideres comme « non finalises » : reservation commencee, non payee.
const TO_FINALIZE_STATUSES = ['PENDING_PAYMENT', 'PENDING_BANK_TRANSFER'];
const ITEMS_PER_PAGE = 20;

export default function BookingsListPage() {
  const t = useTranslations('dashboard.bookingsList');
  const tCommon = useTranslations('common');
  const tErrors = useTranslations('errors');
  const locale = useLocale();
  const dateLocale = locale === 'fr' ? 'fr-FR' : 'en-US';

  const searchParams = useSearchParams();
  const url = useUrlState();
  const statusLabel = useBookingStatusLabel();

  // L'etat de vue vit dans l'URL : la liste est partageable et survit au
  // rechargement, ce qui n'etait pas le cas avec un etat purement local.
  const searchTerm = url.get('q') ?? '';
  const searchType = (url.get('by') as SearchType) ?? 'route';
  const statusFilter = url.get('status') ?? '';
  const page = url.getNumber('page', 1);

  const [showTransferBanner, setShowTransferBanner] = useState(false);
  const [selectedBooking, setSelectedBooking] = useState<any | null>(null);

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

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

  const quota = useReservationQuota();

  // « Modifier » rouvre le parcours existant (recherche → transporteur →
  // paiement) pre-rempli, afin qu'un changement redonne lieu a une cotation.
  const buildEditUrl = (b: any) => {
    const enabledOptions = Object.keys(b.options || {})
      .filter(k => b.options[k])
      .join(',');
    const params = new URLSearchParams({
      editBookingId: b.id,
      origin: b.origin || b.originCity || '',
      destination: b.destination || b.destinationCity || '',
      volumeCBM: String(b.volumeCBM ?? ''),
      weightKG: String(b.weightKG ?? ''),
      palletCount: String(b.palletCount ?? ''),
      hasDangerousGoods: String(!!(b.options && b.options.dangerousGoods)),
    });
    if (enabledOptions) params.set('options', enabledOptions);
    return `/dashboard/search-advanced?${params.toString()}`;
  };

  const statusOptions = [
    { value: 'all', label: t('statusFilter.all') },
    { value: 'to_finalize', label: t('statusFilter.toFinalize') },
    { value: 'PENDING_PAYMENT', label: t('status.pendingPayment') },
    { value: 'PENDING_BANK_TRANSFER', label: t('status.pendingBankTransfer') },
    { value: 'PENDING', label: t('status.pending') },
    { value: 'ACCEPTED', label: t('status.accepted') },
    { value: 'REJECTED', label: t('status.rejected') },
    { value: 'CANCELLED', label: t('status.cancelled') },
  ];

  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 placeholder = t(`searchPlaceholder.${searchType}` as any);

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

    if (statusFilter) {
      filtered =
        statusFilter === 'to_finalize'
          ? filtered.filter((b: any) => TO_FINALIZE_STATUSES.includes(b.status))
          : filtered.filter((b: any) => b.status === statusFilter);
    }

    const term = searchTerm.trim().toLowerCase();
    if (term) {
      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':
            return new Date(booking.requestedPickupDate || booking.requestedAt)
              .toLocaleDateString(dateLocale)
              .includes(term);
          case 'quote':
            // `bookingNumber` est le numero affiche en premiere colonne : sans
            // lui, rechercher le numero qu'on a sous les yeux ne donnait rien.
            return (
              booking.bookingNumber?.toLowerCase().includes(term) ||
              booking.id?.toLowerCase().includes(term) ||
              booking.quoteNumber?.toLowerCase().includes(term)
            );
          default:
            return true;
        }
      });
    }

    return filtered;
  }, [csvData, statusFilter, searchTerm, searchType, dateLocale]);

  const totalBookings = filteredBookings.length;
  const pageCount = Math.max(1, Math.ceil(totalBookings / ITEMS_PER_PAGE));
  const safePage = Math.min(page, pageCount);
  const startIndex = (safePage - 1) * ITEMS_PER_PAGE;
  const paginatedBookings = filteredBookings.slice(startIndex, startIndex + ITEMS_PER_PAGE);

  const shortDate = (value?: string) =>
    value
      ? new Date(value).toLocaleDateString(dateLocale, {
          day: '2-digit',
          month: '2-digit',
          year: 'numeric',
        })
      : 'N/A';

  const columns = useMemo<ColumnDef<any, any>[]>(
    () => [
      {
        id: 'reference',
        header: t('columns.reference'),
        enableSorting: false,
        meta: { cardRole: 'title', headerLabel: t('columns.reference') },
        cell: ({ row }) => {
          const b = row.original;
          const fallback = `#${b.bookingId || b.id.slice(0, 8).toUpperCase()}`;
          return (
            <div className="min-w-0">
              <p className="truncate font-medium text-brand-navy">{b.bookingNumber || fallback}</p>
              {b.bookingNumber && (
                <p className="truncate text-body-xs text-neutral-400">{fallback}</p>
              )}
            </div>
          );
        },
      },
      {
        id: 'route',
        header: t('columns.route'),
        enableSorting: false,
        meta: { cardRole: 'subtitle', headerLabel: t('columns.route') },
        cell: ({ row }) => {
          const b = row.original;
          return (
            <div className="min-w-0">
              <p className="truncate text-neutral-700">
                {b.origin} → {b.destination}
              </p>
              <p className="truncate text-body-xs text-neutral-500">{b.carrierName}</p>
            </div>
          );
        },
      },
      {
        id: 'cargo',
        header: t('columns.cargo'),
        enableSorting: false,
        meta: { hideBelow: 'lg', cardRole: 'field', headerLabel: t('columns.cargo') },
        cell: ({ row }) => {
          const b = row.original;
          return (
            <div className="min-w-0">
              <p className="truncate text-neutral-700">
                {t('units.palletsCount', { count: b.palletCount })} · LCL
              </p>
              <p className="truncate text-body-xs text-neutral-500">
                {t('units.kg', { value: b.weightKG })} · {t('units.cbm', { value: b.volumeCBM })}
              </p>
            </div>
          );
        },
      },
      {
        id: 'status',
        header: t('columns.status'),
        enableSorting: false,
        meta: { cardRole: 'field', headerLabel: t('columns.status') },
        cell: ({ row }) => <BookingStatusBadge status={row.original.status} />,
      },
      {
        id: 'date',
        header: t('columns.date'),
        enableSorting: false,
        meta: { hideBelow: 'lg', cardRole: 'field', headerLabel: t('columns.date') },
        cell: ({ row }) => (
          <span className="whitespace-nowrap text-neutral-500">
            {shortDate(row.original.createdAt || row.original.requestedAt)}
          </span>
        ),
      },
      {
        id: 'actions',
        header: t('columns.actions'),
        size: 64,
        enableSorting: false,
        meta: { align: 'right', cardRole: 'actions' },
        cell: ({ row }) => {
          const b = row.original;
          return (
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <Button variant="ghost" size="icon-sm" aria-label={t('columns.actions')}>
                  <MoreVertical />
                </Button>
              </DropdownMenuTrigger>
              <DropdownMenuContent>
                <DropdownMenuItem onSelect={() => setSelectedBooking(b)}>
                  <Eye />
                  {t('actions.view')}
                </DropdownMenuItem>

                {b.status === 'PENDING_PAYMENT' && (
                  <>
                    <DropdownMenuItem asChild>
                      <Link href={buildEditUrl(b)}>
                        <Pencil />
                        {t('actions.edit')}
                      </Link>
                    </DropdownMenuItem>
                    <DropdownMenuItem asChild>
                      <Link href={`/dashboard/booking/${b.id}/pay`}>
                        <CreditCard />
                        {t('actions.pay')}
                      </Link>
                    </DropdownMenuItem>
                  </>
                )}
              </DropdownMenuContent>
            </DropdownMenu>
          );
        },
      },
    ],
    // eslint-disable-next-line react-hooks/exhaustive-deps
    [t, dateLocale]
  );

  const activeFilters: ActiveFilter[] = [];
  if (statusFilter) {
    activeFilters.push({
      key: 'status',
      label: t('statusFilter.label'),
      value: statusOptions.find(o => o.value === statusFilter)?.label ?? statusFilter,
      onRemove: () => url.set('status', undefined),
    });
  }
  if (searchTerm) {
    activeFilters.push({
      key: 'q',
      label: searchTypeOptions.find(o => o.value === searchType)?.label ?? t('search'),
      value: searchTerm,
      onRemove: () => url.set('q', undefined),
    });
  }

  const newReservationAction = quota.blocked ? (
    <Button asChild variant="secondary">
      <Link href="/dashboard/settings/subscription">
        <Sparkles />
        <span className="hidden sm:inline">{t('limit.upgrade')}</span>
        <span className="sm:hidden">{t('limit.upgradeShort')}</span>
      </Link>
    </Button>
  ) : (
    <Button asChild>
      <Link href="/dashboard/search-advanced">
        <Plus />
        {t('new')}
      </Link>
    </Button>
  );

  return (
    <>
      <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 => statusLabel(v) },
                {
                  key: 'createdAt',
                  label: t('export.createdAt'),
                  format: v => (v ? new Date(v).toLocaleDateString(dateLocale) : ''),
                },
              ]}
            />
            {newReservationAction}
          </>
        }
      />

      <div className="flex flex-col gap-4">
        {showTransferBanner && (
          <Callout variant="warning" title={t('transferBanner.title')}>
            <div className="flex items-start justify-between gap-3">
              <p>{t('transferBanner.message')}</p>
              <Button
                variant="ghost"
                size="icon-sm"
                className="-mr-1 -mt-1 shrink-0"
                onClick={() => setShowTransferBanner(false)}
                aria-label={tCommon('dismiss')}
              >
                <X />
              </Button>
            </div>
          </Callout>
        )}

        {quota.blocked && (
          <Callout variant="warning" title={t('limit.title')}>
            <p>{t('limit.message', { max: quota.max })}</p>
            <Button asChild variant="secondary" size="sm" className="mt-3">
              <Link href="/dashboard/settings/subscription">
                <Sparkles />
                {t('limit.upgrade')}
              </Link>
            </Button>
          </Callout>
        )}

        <FilterBar
          active={activeFilters}
          onClearAll={() => url.clear()}
          labels={{
            filters: tCommon('filters'),
            clearAll: tCommon('clearFilters'),
            remove: tCommon('removeFilter'),
          }}
          filters={
            <>
              <Select
                value={searchType}
                onValueChange={value => url.set('by', value)}
              >
                <SelectTrigger className="w-full md:w-44" aria-label={t('searchType.label')}>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  {searchTypeOptions.map(option => (
                    <SelectItem key={option.value} value={option.value}>
                      {option.label}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>

              <Select
                value={statusFilter || 'all'}
                onValueChange={value => url.set('status', value === 'all' ? undefined : value)}
              >
                <SelectTrigger className="w-full md:w-48" aria-label={t('statusFilter.label')}>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  {statusOptions.map(option => (
                    <SelectItem key={option.value} value={option.value}>
                      {option.label}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </>
          }
        >
          <SearchInput
            value={searchTerm}
            onDebouncedChange={value => url.set('q', value || undefined)}
            placeholder={placeholder}
            ariaLabel={t('search')}
          />
        </FilterBar>

        <DataTable
          columns={columns}
          data={paginatedBookings}
          loading={isLoading}
          error={
            csvError
              ? {
                  title: tErrors('generic'),
                  detail: csvError instanceof Error ? csvError.message : undefined,
                  retryLabel: tCommon('retry'),
                  onRetry: () => refetch(),
                }
              : null
          }
          empty={{
            icon: Package,
            title: t('empty.title'),
            description:
              searchTerm || statusFilter ? t('empty.hasFilters') : t('empty.noBookings'),
            action: newReservationAction,
          }}
          caption={t('title')}
          pagination={{
            page: safePage,
            pageCount,
            onPageChange: next => url.set('page', next > 1 ? next : undefined),
            totalItems: totalBookings,
            pageSize: ITEMS_PER_PAGE,
            labels: {
              previous: t('pagination.previous'),
              next: t('pagination.next'),
              showing: (from, to, total) =>
                t.rich('pagination.showing', {
                  start: from,
                  end: to,
                  total,
                  b: chunks => <span className="font-medium text-brand-navy">{chunks}</span>,
                }),
            },
          }}
        />
      </div>

      <BookingDetailDialog
        booking={selectedBooking}
        onOpenChange={open => !open && setSelectedBooking(null)}
        buildEditUrl={buildEditUrl}
      />
    </>
  );
}