import type { FC } from 'react';
import { useCallback, useEffect, useState } from 'react';
import { Repeat, RefreshCw } from 'lucide-react';
import { Card, Button, EmptyState, Skeleton, Badge, toast } from '../ui';
import { odooApi, type MembresiasReporte } from '../../services/odoo';
import { useReportRange } from '../../lib/reportRange';

const fmtMoney = (value: number, currency = 'MXN') =>
  new Intl.NumberFormat('es-MX', { style: 'currency', currency, maximumFractionDigits: 2 }).format(value || 0);

// Pestaña "Membresías" del módulo de Reportes: altas, cancelaciones, ingresos
// recurrentes por mes, próximas renovaciones y sesiones consumidas.
const MembresiasReport: FC = () => {
  const { start, end } = useReportRange('membresias');
  const [data, setData] = useState<MembresiasReporte | null>(null);
  const [loading, setLoading] = useState(true);

  const load = useCallback(async () => {
    try {
      setLoading(true);
      const res = await odooApi.getMembresiasReporte({ start, end });
      if (res.status === 'success') setData(res);
      else toast.error(res.message || 'No se pudo cargar el reporte');
    } catch (err) {
      const msg = (err as { response?: { data?: { message?: string } } })?.response?.data?.message;
      toast.error(msg || 'Error al cargar el reporte de membresías');
    } finally {
      setLoading(false);
    }
  }, [start, end]);

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

  if (loading) {
    return <Card><Card.Body><Skeleton count={6} /></Card.Body></Card>;
  }
  if (!data) {
    return (
      <Card><Card.Body>
        <EmptyState title="Sin datos" subtitle="No se pudo cargar el reporte de membresías." icon={<Repeat size={28} />} />
      </Card.Body></Card>
    );
  }

  const totalConsumidas = data.sesiones_consumidas || 0;
  const incluidas = data.sesiones_incluidas_activas || 0;

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between gap-3">
        <p className="text-xs text-theme-muted">
          Periodo {data.start} a {data.end}
        </p>
        <Button variant="outline" size="sm" onClick={load}>
          <RefreshCw size={14} className="mr-1.5" /> Actualizar
        </Button>
      </div>

      <div className="grid grid-cols-2 md:grid-cols-4 gap-3">
        <Card><Card.Body>
          <p className="text-xs text-theme-muted">Altas del periodo</p>
          <p className="text-2xl font-heading text-theme-heading">{data.altas}</p>
        </Card.Body></Card>
        <Card><Card.Body>
          <p className="text-xs text-theme-muted">Cancelaciones</p>
          <p className="text-2xl font-heading text-theme-heading">{data.cancelaciones}</p>
        </Card.Body></Card>
        <Card><Card.Body>
          <p className="text-xs text-theme-muted">Membresías activas</p>
          <p className="text-2xl font-heading text-theme-heading">{data.membresias_activas}</p>
        </Card.Body></Card>
        <Card><Card.Body>
          <p className="text-xs text-theme-muted">Ingresos por membresía</p>
          <p className="text-2xl font-heading text-theme-heading">{fmtMoney(data.total_ingresos)}</p>
          <p className="text-[11px] text-theme-muted">de ellos {fmtMoney(data.total_recurrente)} recurrentes</p>
        </Card.Body></Card>
      </div>

      <Card>
        <Card.Header><p className="font-medium text-theme-heading">Ingresos por mes</p></Card.Header>
        <Card.Body noPadding>
          {data.recurrentes_por_mes.length === 0 ? (
            <div className="p-6"><p className="text-sm text-theme-muted">Sin cobros de membresía en el periodo.</p></div>
          ) : (
            <div className="overflow-x-auto">
              <table className="w-full text-sm">
                <thead className="bg-theme-bg text-theme-muted text-[11px] uppercase">
                  <tr>
                    <th className="text-left px-4 py-3">Mes</th>
                    <th className="text-right px-4 py-3">Ingreso recurrente</th>
                    <th className="text-right px-4 py-3">Total cobrado</th>
                  </tr>
                </thead>
                <tbody className="divide-y divide-theme-border">
                  {data.ingresos_por_mes.map((row) => {
                    const rec = data.recurrentes_por_mes.find((r) => r.mes === row.mes)?.total ?? 0;
                    return (
                      <tr key={row.mes}>
                        <td className="px-4 py-3 text-theme-heading">{row.mes}</td>
                        <td className="px-4 py-3 text-right tabular-nums">{fmtMoney(rec)}</td>
                        <td className="px-4 py-3 text-right tabular-nums">{fmtMoney(row.total)}</td>
                      </tr>
                    );
                  })}
                </tbody>
              </table>
            </div>
          )}
        </Card.Body>
      </Card>

      <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
        <Card>
          <Card.Header><p className="font-medium text-theme-heading">Próximas renovaciones (60 días)</p></Card.Header>
          <Card.Body noPadding>
            {data.proximas_renovaciones.length === 0 ? (
              <div className="p-6"><p className="text-sm text-theme-muted">No hay renovaciones próximas.</p></div>
            ) : (
              <ul className="divide-y divide-theme-border">
                {data.proximas_renovaciones.map((r) => (
                  <li key={r.id} className="px-4 py-3 flex items-center justify-between gap-3">
                    <div className="min-w-0">
                      <p className="text-sm text-theme-heading truncate">{r.patient}</p>
                      <p className="text-[11px] text-theme-muted">{r.folio} · {r.plan}</p>
                    </div>
                    <div className="text-right shrink-0">
                      <p className="text-sm text-theme-heading">{r.proximo_cobro}</p>
                      <p className="text-[11px] text-theme-muted">{fmtMoney(r.precio, r.moneda)}</p>
                    </div>
                  </li>
                ))}
              </ul>
            )}
          </Card.Body>
        </Card>

        <Card>
          <Card.Header><p className="font-medium text-theme-heading">Sesiones</p></Card.Header>
          <Card.Body>
            <div className="space-y-3">
              <div className="flex items-center justify-between">
                <span className="text-sm text-theme-muted">Consumidas en el periodo</span>
                <span className="text-theme-heading font-semibold tabular-nums">{totalConsumidas}</span>
              </div>
              <div className="flex items-center justify-between">
                <span className="text-sm text-theme-muted">Incluidas en membresías activas</span>
                <span className="text-theme-heading font-semibold tabular-nums">{incluidas}</span>
              </div>
              {incluidas > 0 && (
                <div>
                  <div className="h-2 rounded-full bg-theme-bg overflow-hidden">
                    <div
                      className="h-full bg-theme-accent"
                      style={{ width: `${Math.min(100, Math.round((totalConsumidas / incluidas) * 100))}%` }}
                    />
                  </div>
                  <p className="text-[11px] text-theme-muted mt-1.5">
                    Uso estimado del {Math.min(100, Math.round((totalConsumidas / incluidas) * 100))}% de las sesiones incluidas.
                  </p>
                </div>
              )}
              <Badge variant="info">Nota: comparación por periodo; estimación de uso.</Badge>
            </div>
          </Card.Body>
        </Card>
      </div>
    </div>
  );
};

export default MembresiasReport;