import React, { useCallback, useEffect, useRef, useState } from 'react';
import { Row, Col, Card, Form, Button, Spinner } from 'react-bootstrap';
import { router } from '@inertiajs/react';
import Swal from 'sweetalert2';
import { FilterX } from 'lucide-react';
import { useLoading } from '../../../LoadingContext';
import useInfiniteClientes from './hooks/useInfiniteClientes';
import ClienteCard from './ClienteCard';
import estilosFoco from '../Contratos/Shared/estilosFocoAccesible.module.css';
import styles from './ClienteCardsView.module.css';

interface Props {
  initialClientes: any[];
  initialPagination: {
    current_page: number;
    last_page: number;
    per_page: number;
    total: number;
    from?: number;
    to?: number;
  };
  flash: any;
}

const FILTROS_INICIALES = {
  CodCli: '',
  NumCifCli: '',
  RazSocCli: '',
  TelFijCli: '',
  TelMovCli: '',
  EmaCli: '',
  NomViaDomFis: '',
  NomLoc: '',
};

const restaurarFoco = (elemento: HTMLElement | null | undefined): void => {
  if (elemento && typeof elemento.focus === 'function') {
    requestAnimationFrame(() => elemento.focus());
  }
};

const ClienteCardsView: React.FC<Props> = ({ initialClientes, initialPagination, flash }) => {
  const { showLoading, hideLoading } = useLoading();
  const debounceRef = useRef<ReturnType<typeof setTimeout> | null>(null);
  const [filters, setFilters] = useState(FILTROS_INICIALES);

  const { items, pagination, isLoading, hasMore, resetWithFilters, sentinelRef } = useInfiniteClientes({
    initialItems: initialClientes,
    initialPagination,
    filters,
  });

  useEffect(() => {
    return () => {
      if (debounceRef.current) {
        clearTimeout(debounceRef.current);
      }
    };
  }, []);

  const onFilterChange = useCallback(
    (key: keyof typeof FILTROS_INICIALES, value: string) => {
      const next = { ...filters, [key]: value };
      setFilters(next);
      if (debounceRef.current) {
        clearTimeout(debounceRef.current);
      }
      debounceRef.current = setTimeout(() => {
        resetWithFilters(next);
      }, 400);
    },
    [filters, resetWithFilters],
  );

  const limpiarFiltros = useCallback(() => {
    if (debounceRef.current) {
      clearTimeout(debounceRef.current);
    }
    setFilters(FILTROS_INICIALES);
    resetWithFilters(FILTROS_INICIALES);
  }, [resetWithFilters]);

  const hayFiltrosActivos = Object.values(filters).some((value) => value.trim() !== '');

  const handleView = (cliente: any) => {
    try {
      showLoading();
      router.visit(route('clientes.ver', { id: cliente.CodCli }), {
        onFinish: () => hideLoading(),
        onError: () => hideLoading(),
      });
    } catch {
      hideLoading();
    }
  };

  const handleEdit = (cliente: any) => {
    try {
      showLoading();
      router.visit(route('clientes.editar', { id: cliente.CodCli }), {
        onFinish: () => hideLoading(),
        onError: () => hideLoading(),
      });
    } catch {
      hideLoading();
    }
  };

  const handleActivate = async (cliente: any, disparador?: HTMLElement) => {
    const result = await Swal.fire({
      title: 'Activar cliente',
      text: `¿Deseas activar al cliente ${cliente.RazSocCli}?`,
      icon: 'question',
      showCancelButton: true,
      confirmButtonText: 'Sí, activar',
      cancelButtonText: 'Cancelar',
      returnFocus: false,
    });

    if (!result.isConfirmed) {
      restaurarFoco(disparador);
      return;
    }

    showLoading();
    router.post(route('clientes.activar', cliente.CodCli), {}, {
      onFinish: () => {
        hideLoading();
        router.reload({ only: ['clientes', 'pagination', 'flash'] });
        Swal.fire({
          title: flash?.message || flash?.error,
          icon: flash?.type || 'success',
          timer: 1200,
          showConfirmButton: false,
          returnFocus: false,
        });
        restaurarFoco(disparador);
      },
    });
  };

  const handleSuspend = async (cliente: any, disparador?: HTMLElement) => {
    const result = await Swal.fire({
      title: 'Suspender cliente',
      text: `¿Deseas suspender al cliente ${cliente.RazSocCli}?`,
      icon: 'warning',
      showCancelButton: true,
      confirmButtonText: 'Sí, suspender',
      cancelButtonText: 'Cancelar',
      returnFocus: false,
    });

    if (!result.isConfirmed) {
      restaurarFoco(disparador);
      return;
    }

    showLoading();
    router.post(route('clientes.suspender', cliente.CodCli), {}, {
      onFinish: () => {
        hideLoading();
        router.reload({ only: ['clientes', 'pagination', 'flash'] });
        Swal.fire({
          title: flash?.message || flash?.error,
          icon: flash?.type || 'success',
          timer: 1200,
          showConfirmButton: false,
          returnFocus: false,
        });
        restaurarFoco(disparador);
      },
    });
  };

  return (
    <div className={`${styles.contenedorVista} ${estilosFoco.contenedorAccesibleContratos}`}>
      <Card className={`mb-3 ${styles.filtrosCard}`}>
        <Card.Body>
          <div className={styles.cabeceraFiltros}>
            <Form.Group className="mb-0">
              <Form.Label className={`${styles.tituloFiltros} d-flex flex-wrap align-items-center gap-2 mb-0`}>
                <span>Filtros</span>
                <span className={styles.contadorResultados} aria-live="polite">
                  Mostrando {items.length} de {pagination.total.toLocaleString('es-ES')} clientes
                </span>
              </Form.Label>
            </Form.Group>
            {hayFiltrosActivos && (
              <Button
                type="button"
                variant="outline-secondary"
                size="sm"
                onClick={limpiarFiltros}
                disabled={isLoading}
                aria-label="Limpiar filtros de búsqueda"
              >
                <FilterX size={16} className="me-1" aria-hidden="true" />
                Limpiar filtros
              </Button>
            )}
          </div>

          <Row className="g-2 mt-2">
            <Col xs={12} sm={6} lg={2}>
              <Form.Group controlId="filtro-cliente-codigo">
                <Form.Label className="small mb-1">Código</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Código"
                  value={filters.CodCli}
                  onChange={(e) => onFilterChange('CodCli', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={2}>
              <Form.Group controlId="filtro-cliente-nif">
                <Form.Label className="small mb-1">NIF</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="NIF"
                  value={filters.NumCifCli}
                  onChange={(e) => onFilterChange('NumCifCli', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={4}>
              <Form.Group controlId="filtro-cliente-razon">
                <Form.Label className="small mb-1">Razón social</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Razón social"
                  value={filters.RazSocCli}
                  onChange={(e) => onFilterChange('RazSocCli', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={2}>
              <Form.Group controlId="filtro-cliente-tel-fijo">
                <Form.Label className="small mb-1">Tel. fijo</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Tel. fijo"
                  value={filters.TelFijCli}
                  onChange={(e) => onFilterChange('TelFijCli', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={2}>
              <Form.Group controlId="filtro-cliente-tel-movil">
                <Form.Label className="small mb-1">Tel. móvil</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Tel. móvil"
                  value={filters.TelMovCli}
                  onChange={(e) => onFilterChange('TelMovCli', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={4}>
              <Form.Group controlId="filtro-cliente-email">
                <Form.Label className="small mb-1">Email</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Email"
                  value={filters.EmaCli}
                  onChange={(e) => onFilterChange('EmaCli', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={4}>
              <Form.Group controlId="filtro-cliente-direccion">
                <Form.Label className="small mb-1">Dirección</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Dirección"
                  value={filters.NomViaDomFis}
                  onChange={(e) => onFilterChange('NomViaDomFis', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={4}>
              <Form.Group controlId="filtro-cliente-localidad">
                <Form.Label className="small mb-1">Localidad</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Localidad"
                  value={filters.NomLoc}
                  onChange={(e) => onFilterChange('NomLoc', e.target.value)}
                />
              </Form.Group>
            </Col>
          </Row>
        </Card.Body>
      </Card>

      <div className={styles.gridClientes}>
        {items.map((cliente: any, idx) => (
          <div key={`${cliente.CodCli}-${idx}`}>
            <ClienteCard
              cliente={cliente}
              onConsultar={handleView}
              onEditar={handleEdit}
              onActivar={handleActivate}
              onSuspender={handleSuspend}
            />
          </div>
        ))}

        {isLoading && (
          <div className={`${styles.gridItemAnchoCompleto} text-center py-4`}>
            <Spinner animation="border" variant="primary" role="status">
              <span className="visually-hidden">Cargando más clientes…</span>
            </Spinner>
            <p className="mt-2 text-muted">Cargando más clientes...</p>
          </div>
        )}

        {hasMore && !isLoading && (
          <div className={styles.gridItemAnchoCompleto}>
            <div ref={sentinelRef} style={{ height: '20px', width: '100%' }} aria-hidden="true" />
          </div>
        )}
      </div>

      {items.length === 0 && !isLoading && (
        <div className={styles.estadoVacio} role="status">
          No hay clientes que coincidan con la búsqueda
          {hayFiltrosActivos && (
            <div className="mt-2">
              <Button type="button" size="sm" variant="link" onClick={limpiarFiltros}>
                Limpiar filtros
              </Button>
            </div>
          )}
        </div>
      )}

      {!hasMore && items.length > 0 && (
        <div className="text-center text-muted py-4">
          <small>Has visto todos los clientes ({pagination.total.toLocaleString('es-ES')})</small>
        </div>
      )}
    </div>
  );
};

export default ClienteCardsView;