import React, { useEffect, useState } from 'react';
import fetchWithAuth from '../fetchWithAuth';
const initialFilters = {
  pedimento_app: '',
  aduana: '',
  patente: '',
  regimen: '',
  agente_aduanal: '',
  tipo_operacion: '',
  fecha_pago_gte: '',
  fecha_pago_lte: '',
  contribuyente__rfc: '',
};
export default function TableroAlmacenamiento() {
  const [filters, setFilters] = useState(initialFilters);
  const [summary, setSummary] = useState(null);
  const [isLoading, setIsLoading] = useState(false);
  const [reports, setReports] = useState([]);

  const handleGenerateReport = async () => {
    try {
      const params = Object.entries(filters)
        .filter(([_, v]) => v)
        .map(([k, v]) => `${encodeURIComponent(k)}=${encodeURIComponent(v)}`)
        .join('&');
      const url = `${import.meta.env.VITE_EFC_API_URL}/reports/table-summary/${params ? `?${params}` : ''}`;
      const res = await fetchWithAuth(url, { method: 'POST' });
      if (!res.ok) throw new Error('Error al generar el reporte');
      alert('Reporte solicitado correctamente. Aparecerá en el historial cuando esté listo.');
    } catch (err) {
      alert('No se pudo generar el reporte.');
    }
  };

  const handleDownloadReport = async (reportId) => {
    try {
      const url = `${import.meta.env.VITE_EFC_API_URL}/reports/report-document-download/${reportId}/`;
      const res = await fetchWithAuth(url);
      if (!res.ok) throw new Error('Error al descargar el reporte');
      const blob = await res.blob();
      let filename = `reporte_${reportId}.csv`;
      const disposition = res.headers.get('Content-Disposition');
      if (disposition && disposition.includes('filename=')) {
        filename = disposition.split('filename=')[1].replace(/"/g, '').trim();
      }
      const link = document.createElement('a');
      link.href = window.URL.createObjectURL(blob);
      link.download = filename;
      document.body.appendChild(link);
      link.click();
      document.body.removeChild(link);
    } catch (err) {
      alert('No se pudo descargar el reporte.');
    }
  };

  // Fetch summary data
  const fetchSummary = async () => {
    setIsLoading(true);
    try {
      const params = Object.entries(filters)
        .filter(([_, v]) => v)
        .map(([k, v]) => `${encodeURIComponent(k)}=${encodeURIComponent(v)}`)
        .join('&');
      const url = `${import.meta.env.VITE_EFC_API_URL}/reports/dashboard/summary/${params ? `?${params}` : ''}`;
      const res = await fetchWithAuth(url);
      const data = await res.json();
      setSummary(data);
    } catch (err) {
      setSummary(null);
    }
    setIsLoading(false);
  };

  // Fetch report list from API
  useEffect(() => {
    const fetchReports = async () => {
      try {
        const url = `${import.meta.env.VITE_EFC_API_URL}/reports/report-document-list/`;
        const res = await fetchWithAuth(url);
        if (!res.ok) throw new Error('Error al obtener el historial de reportes');
        const data = await res.json();
        setReports(data);
      } catch (err) {
        setReports([]);
      }
    };
    fetchReports();
  }, []);

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

  const handleFilterChange = (e) => {
    setFilters({ ...filters, [e.target.name]: e.target.value });
  };

  
  return (
    <div className="min-h-screen bg-gradient-to-br from-slate-50 via-white to-slate-100">
      {/* Header */}
      <div className="bg-slate-800 px-4 py-5 sm:px-6 shadow">
        <div className="max-w-7xl mx-auto flex items-center gap-4">
          <div className="p-2 bg-blue-700 rounded-xl">
            <svg className="w-6 h-6 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z" />
            </svg>
          </div>
          <div>
            <h1 className="text-2xl font-bold text-white">Resumen de Cumplimiento</h1>
          </div>
        </div>
      </div>

      {/* Filtros */}
      <div className="max-w-7xl mx-auto mt-6 mb-4 px-4">
        <form onSubmit={(e) => {
          e.preventDefault();
          fetchSummary();
        }} className="bg-white rounded-lg shadow-sm border border-slate-200 p-4">
          <div className="grid grid-cols-2 md:grid-cols-4 gap-4 mb-4">
            {Object.keys(initialFilters).map((key) => (
              <div key={key}>
                <label className="block text-xs font-medium text-slate-600 mb-1" htmlFor={key}>
                  {key.replace(/_/g, ' ').replace('gte', 'desde').replace('lte', 'hasta')}
                </label>
                <input
                  type={key.includes('fecha') ? 'date' : 'text'}
                  name={key}
                  id={key}
                  value={filters[key]}
                  onChange={handleFilterChange}
                  className="w-full border border-slate-300 rounded px-2 py-1 text-sm focus:ring-blue-500 focus:border-blue-500"
                />
              </div>
            ))}
          </div>
          <div className="flex justify-end">
            <div className="flex gap-2">
              <button
                type="submit"
                className="bg-blue-600 text-white px-4 py-2 rounded-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 transition-colors"
              >
                Aplicar Filtros
              </button>
              <button
                type="button"
                className="bg-green-600 text-white px-4 py-2 rounded-md hover:bg-green-700 focus:outline-none focus:ring-2 focus:ring-green-500 focus:ring-offset-2 transition-colors"
                onClick={() => alert('Generar reporte (implementación pendiente)')}
              >
                Generar Reporte
              </button>
            </div>
          </div>
        </form>
      </div>

      {/* Cards */}
      <div className="max-w-7xl mx-auto px-4">
        {isLoading ? (
          <div className="flex justify-center items-center h-64">
            <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600 mr-4"></div>
            <span className="text-slate-600">Cargando resumen...</span>
          </div>
        ) : summary ? (
          <>
            <div className="grid grid-cols-1 lg:grid-cols-4 gap-4">
              {/* ...Tarjetas existentes... */}
              {/* ...aquí van las Card como antes... */}
              {/* ...no se repite para brevedad... */}
            </div>
            {/* Tabla de reportes debajo de las tarjetas */}
            <div className="mt-10">
              <h2 className="text-lg font-bold text-slate-700 mb-4">Historial de Reportes</h2>
              <div className="overflow-x-auto">
                <table className="min-w-full bg-white rounded-lg shadow border border-slate-200">
                  <thead>
                    <tr className="bg-slate-100">
                      <th className="px-4 py-2 text-left text-xs font-semibold text-slate-600">ID</th>
                      <th className="px-4 py-2 text-left text-xs font-semibold text-slate-600">Estado</th>
                      <th className="px-4 py-2 text-left text-xs font-semibold text-slate-600">Creado</th>
                      <th className="px-4 py-2 text-left text-xs font-semibold text-slate-600">Finalizado</th>
                      <th className="px-4 py-2 text-left text-xs font-semibold text-slate-600">Error</th>
                      <th className="px-4 py-2 text-left text-xs font-semibold text-slate-600">Descargar</th>
                    </tr>
                  </thead>
                  <tbody>
                    {reports.length > 0 ? (
                      reports.map((r) => (
                        <tr key={r.report_id}>
                          <td className="px-4 py-2 text-xs text-slate-700">{r.report_id}</td>
                          <td className="px-4 py-2 text-xs text-slate-700">{r.status}</td>
                          <td className="px-4 py-2 text-xs text-slate-700">{r.created_at}</td>
                          <td className="px-4 py-2 text-xs text-slate-700">{r.finished_at}</td>
                          <td className="px-4 py-2 text-xs text-red-500">{r.error_message ? r.error_message : '-'}</td>
                          <td className="px-4 py-2 text-xs">
                            {r.status === 'ready' ? (
                              <button
                                className="text-blue-600 hover:underline"
                                onClick={() => handleDownloadReport(r.report_id)}
                              >
                                Descargar
                              </button>
                            ) : (
                              <span className="text-slate-400">-</span>
                            )}
                          </td>
                        </tr>
                      ))
                    ) : (
                      <tr>
                        <td colSpan={6} className="px-4 py-2 text-center text-slate-400">No hay reportes disponibles.</td>
                      </tr>
                    )}
                  </tbody>
                </table>
              </div>
            </div>
          </>
        ) : (
          <div className="text-center text-slate-500 py-12">No hay datos para mostrar.</div>
        )}
      </div>
    </div>
  );
}