'use client';

import { useState } from 'react';
import { Header } from '@/components/layouts/header';
import { Card, CardContent, CardHeader, CardTitle, Button } from '@horux/shared-ui';
import { useAuthStore } from '@/stores/auth-store';
import { isGlobalAdminRfc } from '@horux/shared';
import { usePagosSinFactura, useEmitirFacturaPago } from '@/lib/hooks/use-pagos-sin-factura';
import { ShieldAlert, FileText, RefreshCw, CheckCircle, AlertCircle, Receipt } from 'lucide-react';

const PLAN_LABELS: Record<string, string> = {
  trial: 'Trial',
  custom: 'Custom',
  mi_empresa: 'Mi Empresa',
  mi_empresa_plus: 'Mi Empresa Plus',
  business_control: 'Business Control',
  business_cloud: 'Enterprise',
};

const METHOD_LABELS: Record<string, string> = {
  master: 'Mastercard',
  visa: 'Visa',
  amex: 'Amex',
  debmaster: 'Débito Mastercard',
  debvisa: 'Débito Visa',
  account_money: 'MercadoPago',
  bank_transfer: 'Transferencia',
};

function formatCurrency(amount: string | number): string {
  const num = typeof amount === 'string' ? parseFloat(amount) : amount;
  return new Intl.NumberFormat('es-MX', { style: 'currency', currency: 'MXN' }).format(num);
}

function formatDate(iso: string | null): string {
  if (!iso) return '—';
  return new Date(iso).toLocaleString('es-MX', { dateStyle: 'short', timeStyle: 'short' });
}

export default function FacturasPendientesPage() {
  const { user } = useAuthStore();
  const isGlobalAdmin = isGlobalAdminRfc(user?.tenantRfc, user?.role, user?.platformRoles);
  const { data: payments, isLoading, error } = usePagosSinFactura();
  const emitir = useEmitirFacturaPago();
  const [emitiendoId, setEmitiendoId] = useState<string | null>(null);

  if (!isGlobalAdmin) {
    return (
      <>
        <Header title="Facturas Pendientes" />
        <main className="p-6">
          <Card>
            <CardContent className="py-12 text-center">
              <ShieldAlert className="h-12 w-12 text-muted-foreground/40 mx-auto mb-3" />
              <p className="font-semibold">Acceso restringido</p>
              <p className="text-sm text-muted-foreground mt-1">
                Solo el administrador global puede consultar pagos sin factura.
              </p>
            </CardContent>
          </Card>
        </main>
      </>
    );
  }

  async function handleEmitir(paymentId: string) {
    setEmitiendoId(paymentId);
    try {
      await emitir.mutateAsync(paymentId);
    } finally {
      setEmitiendoId(null);
    }
  }

  return (
    <>
      <Header title="Facturas Pendientes" />
      <main className="p-6">
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <Receipt className="h-5 w-5" />
              Pagos de suscripción sin factura
            </CardTitle>
          </CardHeader>
          <CardContent>
            {isLoading && (
              <div className="flex items-center justify-center py-12 text-muted-foreground">
                <RefreshCw className="h-5 w-5 animate-spin mr-2" />
                Cargando...
              </div>
            )}

            {error && (
              <div className="flex items-center justify-center py-12 text-red-600">
                <AlertCircle className="h-5 w-5 mr-2" />
                Error al cargar los pagos
              </div>
            )}

            {!isLoading && !error && payments && payments.length === 0 && (
              <div className="flex flex-col items-center justify-center py-12 text-muted-foreground">
                <CheckCircle className="h-10 w-10 mb-3 text-green-500" />
                <p className="font-medium">No hay pagos pendientes de facturar</p>
                <p className="text-sm mt-1">Todos los pagos aprobados ya tienen su factura emitida.</p>
              </div>
            )}

            {!isLoading && !error && payments && payments.length > 0 && (
              <div className="overflow-x-auto">
                <table className="w-full text-sm">
                  <thead>
                    <tr className="border-b">
                      <th className="text-left py-3 px-2 font-medium text-muted-foreground">Cliente</th>
                      <th className="text-left py-3 px-2 font-medium text-muted-foreground">Plan</th>
                      <th className="text-left py-3 px-2 font-medium text-muted-foreground">Monto</th>
                      <th className="text-left py-3 px-2 font-medium text-muted-foreground">Método</th>
                      <th className="text-left py-3 px-2 font-medium text-muted-foreground">Fecha de pago</th>
                      <th className="text-right py-3 px-2 font-medium text-muted-foreground">Acción</th>
                    </tr>
                  </thead>
                  <tbody>
                    {payments.map((p) => (
                      <tr key={p.id} className="border-b last:border-0 hover:bg-muted/30">
                        <td className="py-3 px-2">
                          <div className="font-medium">{p.tenant.nombre}</div>
                          <div className="text-xs text-muted-foreground font-mono">{p.tenant.rfc || '—'}</div>
                        </td>
                        <td className="py-3 px-2">
                          <span className="inline-flex items-center rounded-md bg-secondary px-2 py-1 text-xs font-medium text-secondary-foreground ring-1 ring-inset ring-secondary/20">
                            {PLAN_LABELS[p.subscription?.plan || 'custom'] || p.subscription?.plan || 'Custom'}
                          </span>
                        </td>
                        <td className="py-3 px-2 font-semibold">{formatCurrency(p.amount)}</td>
                        <td className="py-3 px-2 text-muted-foreground">
                          {METHOD_LABELS[p.paymentMethod || ''] || p.paymentMethod || '—'}
                        </td>
                        <td className="py-3 px-2 text-muted-foreground">{formatDate(p.paidAt)}</td>
                        <td className="py-3 px-2 text-right">
                          <Button
                            size="sm"
                            onClick={() => handleEmitir(p.id)}
                            disabled={emitir.isPending && emitiendoId === p.id}
                          >
                            {emitir.isPending && emitiendoId === p.id ? (
                              <>
                                <RefreshCw className="h-4 w-4 mr-1 animate-spin" />
                                Emitiendo...
                              </>
                            ) : (
                              <>
                                <FileText className="h-4 w-4 mr-1" />
                                Emitir factura
                              </>
                            )}
                          </Button>
                        </td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            )}
          </CardContent>
        </Card>
      </main>
    </>
  );
}