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

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

const FILTROS_INICIALES = {
  CodCupGas: '',
  CUPsName: '',
  TipServ: '',
  Cups_RazSocCli: '',
  Cups_Cif: '',
  NomTarGas: '',
  EstCUPs: '',
};

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

  const { cups, pagination, isLoading, hasMore, resetWithFilters, sentinelRef } = useInfiniteCups({
    initialCups,
    initialPagination,
    filters,
  });

  const debouncedResetFilters = useCallback(
    (newFilters: Record<string, string>) => {
      if (debounceTimerRef.current) {
        clearTimeout(debounceTimerRef.current);
      }

      debounceTimerRef.current = setTimeout(() => {
        resetWithFilters(newFilters);
      }, 500);
    },
    [resetWithFilters],
  );

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

  const updateFilter = useCallback(
    (key: keyof typeof FILTROS_INICIALES, value: string) => {
      const newFilters = { ...filters, [key]: value };
      setFilters(newFilters);
      debouncedResetFilters(newFilters);
    },
    [filters, debouncedResetFilters],
  );

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

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

  const handleEdit = (cupsItem: any) => {
    try {
      showLoading();
      router.visit(route('puntos-suministro.edit', { id: cupsItem.CodPunSum }), {
        onFinish: () => hideLoading(),
        onError: () => hideLoading(),
      });
    } catch {
      hideLoading();
    }
  };

  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}>
                  Mostrando {cups.length} de {pagination.total.toLocaleString('es-ES')} CUPS
                </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-codigo-cups">
                <Form.Label className="small mb-1">Código</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Buscar por código"
                  value={filters.CodCupGas}
                  onChange={(e) => updateFilter('CodCupGas', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={3}>
              <Form.Group controlId="filtro-cups-name">
                <Form.Label className="small mb-1">CUPS</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Buscar por CUPS"
                  value={filters.CUPsName}
                  onChange={(e) => updateFilter('CUPsName', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={2}>
              <Form.Group controlId="filtro-tipo-servicio">
                <Form.Label className="small mb-1">Tipo</Form.Label>
                <Form.Select
                  size="sm"
                  value={filters.TipServ}
                  onChange={(e) => updateFilter('TipServ', e.target.value)}
                >
                  <option value="">Todos los tipos</option>
                  <option value="Eléctrico">Eléctrico</option>
                  <option value="Gas">Gas</option>
                </Form.Select>
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={3}>
              <Form.Group controlId="filtro-cliente">
                <Form.Label className="small mb-1">Cliente</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Buscar por cliente"
                  value={filters.Cups_RazSocCli}
                  onChange={(e) => updateFilter('Cups_RazSocCli', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={2}>
              <Form.Group controlId="filtro-nif">
                <Form.Label className="small mb-1">NIF</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Buscar por NIF"
                  value={filters.Cups_Cif}
                  onChange={(e) => updateFilter('Cups_Cif', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={3}>
              <Form.Group controlId="filtro-tarifa">
                <Form.Label className="small mb-1">Tarifa</Form.Label>
                <Form.Control
                  size="sm"
                  placeholder="Buscar por tarifa"
                  value={filters.NomTarGas}
                  onChange={(e) => updateFilter('NomTarGas', e.target.value)}
                />
              </Form.Group>
            </Col>
            <Col xs={12} sm={6} lg={2}>
              <Form.Group controlId="filtro-estado">
                <Form.Label className="small mb-1">Estado</Form.Label>
                <Form.Select
                  size="sm"
                  value={filters.EstCUPs}
                  onChange={(e) => updateFilter('EstCUPs', e.target.value)}
                >
                  <option value="">Todos los estados</option>
                  <option value="ACTIVO">Activo</option>
                  <option value="DADO DE BAJA">Dado de Baja</option>
                </Form.Select>
              </Form.Group>
            </Col>
          </Row>
        </Card.Body>
      </Card>

      <div className={styles.gridCups}>
        {cups.map((cupsItem: any, idx) => (
          <div key={`${cupsItem.CodCupGas}-${cupsItem.TipServ}-${idx}`}>
            <CupsCard cups={cupsItem} onEditar={handleEdit} />
          </div>
        ))}

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

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

      {cups.length === 0 && !isLoading && (
        <div className={styles.estadoVacio}>
          No hay CUPS 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 && cups.length > 0 && (
        <div className="text-center text-muted py-4">
          <small>Has visto todos los CUPS ({pagination.total.toLocaleString('es-ES')})</small>
        </div>
      )}
    </div>
  );
};

export default CupsCardsView;