import { useMemo } from 'react';
import { useQuery } from '@tanstack/react-query';
import { type ColumnDef } from '@tanstack/react-table';
import { Landmark, RefreshCw, Hash, CalendarDays, Banknote, Download } from 'lucide-react';

import { type Transaction, type SalariosSummary, getSalarios, getSalariosSummary } from '@/lib/api';
import { formatAmount, formatDate } from '@/lib/format';
import ErrorState from '@/components/ErrorState';
import { DataTable } from '@/components/ui/data-table';
import { DataTableColumnHeader } from '@/components/ui/data-table-column-header';
import { Card, CardContent } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';

export default function Salarios() {
  const query = useQuery({
    queryKey: ['salarios'],
    queryFn: async () => {
      const [depRes, sumRes] = await Promise.all([
        getSalarios({ limit: 500 }),
        getSalariosSummary(),
      ]);
      return { deposits: depRes.data, summary: sumRes.data };
    },
  });
  const deposits = query.data?.deposits ?? [];
  const summary = query.data?.summary ?? null;
  const loading = query.isFetching;
  const fetchData = () => query.refetch();

  const columns = useMemo<ColumnDef<Transaction, unknown>[]>(
    () => [
      {
        accessorKey: 'date',
        header: ({ column }) => <DataTableColumnHeader column={column} title="Fecha" />,
        cell: ({ row }) => {
          const d = new Date(row.original.date);
          return (
            <div>
              <span className="font-medium">{formatDate(row.original.date)}</span>
              <span className="text-muted-foreground ml-1 text-xs">{d.getFullYear()}</span>
            </div>
          );
        },
      },
      {
        accessorKey: 'merchant',
        header: ({ column }) => <DataTableColumnHeader column={column} title="Detalle" />,
        cell: ({ row }) => (
          <div>
            <span className="font-medium">{row.original.merchant}</span>
            {row.original.notes && (
              <p className="text-xs text-muted-foreground truncate max-w-xs">{row.original.notes}</p>
            )}
          </div>
        ),
      },
      {
        accessorKey: 'amount',
        header: ({ column }) => <DataTableColumnHeader column={column} title="Monto" />,
        cell: ({ row }) => (
          <span data-sensitive className="font-mono font-bold text-primary">
            +{formatAmount(row.original.amount, row.original.currency)}
          </span>
        ),
        meta: { className: 'text-right' },
      },
      {
        accessorKey: 'bank',
        header: ({ column }) => <DataTableColumnHeader column={column} title="Banco" />,
        cell: ({ row }) => (
          <Badge variant="outline">{row.original.bank}</Badge>
        ),
      },
      {
        accessorKey: 'reference',
        header: ({ column }) => <DataTableColumnHeader column={column} title="Comprobante" />,
        cell: ({ row }) => (
          <span className="font-mono text-xs text-muted-foreground">
            {row.original.reference || '—'}
          </span>
        ),
      },
    ],
    [],
  );

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-3">
          <div className="w-10 h-10 rounded-lg bg-primary/10 flex items-center justify-center">
            <Landmark className="w-5 h-5 text-primary" />
          </div>
          <div>
            <h1 className="text-2xl font-bold font-heading">Salarios</h1>
            <p className="text-sm text-muted-foreground">Historial de depósitos salariales</p>
          </div>
        </div>
        <Button
          variant="outline"
          size="sm"
          onClick={() => window.open('/api/v1/transactions/export?transaction_type=SALARY', '_blank')}
          title="Descargar salarios como CSV"
        >
          <Download className="w-4 h-4 mr-2" aria-hidden="true" />
          CSV
        </Button>
        <Button variant="ghost" size="icon" onClick={fetchData} title="Refresh" aria-label="Refresh">
          <RefreshCw className={loading ? 'w-4 h-4 animate-spin' : 'w-4 h-4'} />
        </Button>
      </div>

      {/* Summary cards */}
      {summary && (
        <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
          <Card>
            <CardContent className="p-4">
              <div className="flex items-center gap-2 text-muted-foreground mb-1">
                <Hash className="w-4 h-4" />
                <span className="text-xs font-medium uppercase tracking-wider">Depósitos</span>
              </div>
              <span className="text-2xl font-bold font-mono">{summary.count}</span>
            </CardContent>
          </Card>
          <Card>
            <CardContent className="p-4">
              <div className="flex items-center gap-2 text-muted-foreground mb-1">
                <Banknote className="w-4 h-4" />
                <span className="text-xs font-medium uppercase tracking-wider">Total acumulado</span>
              </div>
              <span data-sensitive className="text-2xl font-bold font-mono text-primary">
                {formatAmount(summary.total_amount, 'CRC')}
              </span>
            </CardContent>
          </Card>
          <Card>
            <CardContent className="p-4">
              <div className="flex items-center gap-2 text-muted-foreground mb-1">
                <CalendarDays className="w-4 h-4" />
                <span className="text-xs font-medium uppercase tracking-wider">Último depósito</span>
              </div>
              <span className="text-2xl font-bold font-mono">
                {summary.latest_date ? formatDate(summary.latest_date) : '—'}
              </span>
            </CardContent>
          </Card>
        </div>
      )}

      {/* Data table */}
      {query.isError ? (
        <ErrorState
          message="No se pudieron cargar los salarios"
          onRetry={fetchData}
        />
      ) : (
        <Card>
          <CardContent className="p-0">
            <DataTable
              columns={columns}
              data={deposits}
              pagination
              pageSize={25}
              initialSorting={[{ id: 'date', desc: true }]}
              emptyMessage="No hay depósitos registrados aún."
            />
          </CardContent>
        </Card>
      )}
    </div>
  );
}