import React, { useState } from 'react';
import { useHubStore } from '../store/useHubStore.js';
import { Invoice } from '../types/index.js';
import { hubApi } from '../api/hubApi.js';
import {
  Search,
  Eye,
  FileCode,
  FileDown,
  ExternalLink,
  CheckCircle2,
  AlertCircle,
  Clock,
  Sparkles,
} from 'lucide-react';

export const InvoicesTable: React.FC = () => {
  const { invoices, setSelectedInvoice, tenants } = useHubStore();
  const [searchTerm, setSearchTerm] = useState('');
  const [statusFilter, setStatusFilter] = useState<'ALL' | 'ACEPTADA' | 'RECHAZADA'>('ALL');

  const getTenantName = (tenantId: string) => {
    const t = tenants.find((tenant) => tenant.id === tenantId);
    return t ? t.name : 'Innovación & Desarrollo';
  };

  const getTenantBadge = (tenantId: string) => {
    const t = tenants.find((tenant) => tenant.id === tenantId);
    if (t?.slug === 'dripzone') {
      return (
        <span className="inline-flex items-center gap-1 rounded-md bg-purple-500/10 px-2 py-0.5 text-[11px] font-semibold text-purple-400 border border-purple-500/20">
          👟 DripZone
        </span>
      );
    }
    if (t?.slug === 'pacifictrans') {
      return (
        <span className="inline-flex items-center gap-1 rounded-md bg-blue-500/10 px-2 py-0.5 text-[11px] font-semibold text-blue-400 border border-blue-500/20">
          🚛 PacificTrans
        </span>
      );
    }
    return (
      <span className="inline-flex items-center gap-1 rounded-md bg-slate-500/10 px-2 py-0.5 text-[11px] font-semibold text-slate-400 border border-slate-500/20">
        🏢 Emisor
      </span>
    );
  };

  const filteredInvoices = invoices.filter((inv) => {
    const matchesSearch =
      inv.fullNumber.toLowerCase().includes(searchTerm.toLowerCase()) ||
      inv.customer.legalOrFullName.toLowerCase().includes(searchTerm.toLowerCase()) ||
      inv.customer.identificationNumber.includes(searchTerm) ||
      (inv.cufe && inv.cufe.toLowerCase().includes(searchTerm.toLowerCase()));

    const matchesStatus = statusFilter === 'ALL' || inv.dianStatus === statusFilter;

    return matchesSearch && matchesStatus;
  });

  const formatCop = (val: number) => {
    return new Intl.NumberFormat('es-CO', {
      style: 'currency',
      currency: 'COP',
      minimumFractionDigits: 0,
    }).format(val);
  };

  const handleDownloadXml = async (inv: Invoice, e: React.MouseEvent) => {
    e.stopPropagation();
    try {
      const xml = await hubApi.getXml(inv.id);
      const blob = new Blob([xml], { type: 'application/xml' });
      const url = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = `face_${inv.fullNumber}.xml`;
      a.click();
      URL.revokeObjectURL(url);
    } catch (err) {
      alert('Error al descargar el archivo XML.');
    }
  };

  const handleDownloadPdf = (inv: Invoice, e: React.MouseEvent) => {
    e.stopPropagation();
    window.open(hubApi.getPdfUrl(inv.id), '_blank');
  };

  return (
    <div className="glass-card rounded-2xl border border-slate-800 overflow-hidden">
      {/* Header & Controls */}
      <div className="flex flex-col sm:flex-row items-center justify-between gap-4 p-5 border-b border-slate-800/80 bg-slate-900/40">
        <div>
          <h2 className="text-lg font-bold text-white flex items-center gap-2">
            Comprobantes Electrónicos UBL 2.1
            <span className="text-xs font-normal text-slate-400">({filteredInvoices.length} facturas)</span>
          </h2>
          <p className="text-xs text-slate-400">
            Historial de facturas firmadas con XAdES-BES y transmitidas a la DIAN.
          </p>
        </div>

        <div className="flex flex-wrap items-center gap-2.5 w-full sm:w-auto">
          {/* Search Input */}
          <div className="relative flex-1 sm:w-64">
            <Search className="absolute left-3 top-2.5 h-3.5 w-3.5 text-slate-500" />
            <input
              type="text"
              placeholder="Buscar por número, cliente, NIT o CUFE..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              className="w-full rounded-lg border border-slate-800 bg-slate-950/80 py-2 pl-9 pr-3 text-xs text-slate-200 placeholder-slate-500 outline-none focus:border-emerald-500 focus:ring-1 focus:ring-emerald-500"
            />
          </div>

          {/* Status Filter */}
          <div className="flex items-center gap-1 rounded-lg border border-slate-800 bg-slate-950 p-1">
            <button
              onClick={() => setStatusFilter('ALL')}
              className={`rounded px-2.5 py-1 text-xs font-medium transition-all ${
                statusFilter === 'ALL' ? 'bg-slate-800 text-white' : 'text-slate-400 hover:text-white'
              }`}
            >
              Todas
            </button>
            <button
              onClick={() => setStatusFilter('ACEPTADA')}
              className={`rounded px-2.5 py-1 text-xs font-medium transition-all ${
                statusFilter === 'ACEPTADA' ? 'bg-emerald-500/20 text-emerald-400 font-semibold' : 'text-slate-400 hover:text-white'
              }`}
            >
              Aceptadas
            </button>
            <button
              onClick={() => setStatusFilter('RECHAZADA')}
              className={`rounded px-2.5 py-1 text-xs font-medium transition-all ${
                statusFilter === 'RECHAZADA' ? 'bg-red-500/20 text-red-400 font-semibold' : 'text-slate-400 hover:text-white'
              }`}
            >
              Rechazadas
            </button>
          </div>
        </div>
      </div>

      {/* Invoices Table */}
      <div className="overflow-x-auto">
        <table className="w-full text-left text-xs text-slate-300">
          <thead className="bg-slate-950/60 uppercase tracking-wider text-[11px] text-slate-400 border-b border-slate-800">
            <tr>
              <th className="px-5 py-3.5 font-semibold">Comprobante</th>
              <th className="px-5 py-3.5 font-semibold">Tenant</th>
              <th className="px-5 py-3.5 font-semibold">Cliente / Adquiriente</th>
              <th className="px-5 py-3.5 font-semibold">Fecha Emisión</th>
              <th className="px-5 py-3.5 font-semibold text-right">Total (COP)</th>
              <th className="px-5 py-3.5 font-semibold text-center">Estado DIAN</th>
              <th className="px-5 py-3.5 font-semibold text-right">Acciones</th>
            </tr>
          </thead>
          <tbody className="divide-y divide-slate-800/60 font-medium">
            {filteredInvoices.length === 0 ? (
              <tr>
                <td colSpan={7} className="py-12 text-center text-slate-500">
                  No se encontraron comprobantes fiscales que coincidan con la búsqueda.
                </td>
              </tr>
            ) : (
              filteredInvoices.map((inv) => (
                <tr
                  key={inv.id}
                  onClick={() => setSelectedInvoice(inv)}
                  className="cursor-pointer transition-colors hover:bg-slate-800/40"
                >
                  {/* Comprobante */}
                  <td className="px-5 py-4">
                    <div className="font-mono font-bold text-white flex items-center gap-1.5">
                      {inv.fullNumber}
                    </div>
                    <div className="text-[10px] text-slate-500 font-mono truncate max-w-[140px]">
                      CUFE: {inv.cufe?.slice(0, 16)}...
                    </div>
                  </td>

                  {/* Tenant */}
                  <td className="px-5 py-4">{getTenantBadge(inv.tenantId)}</td>

                  {/* Cliente */}
                  <td className="px-5 py-4">
                    <div className="font-semibold text-slate-200">{inv.customer.legalOrFullName}</div>
                    <div className="text-[11px] text-slate-400">
                      NIT/CC: {inv.customer.identificationNumber}
                    </div>
                  </td>

                  {/* Fecha */}
                  <td className="px-5 py-4">
                    <div className="text-slate-200">{inv.issueDate}</div>
                    <div className="text-[11px] text-slate-500 font-mono">{inv.issueTime}</div>
                  </td>

                  {/* Total */}
                  <td className="px-5 py-4 text-right">
                    <div className="font-bold text-white text-sm">{formatCop(inv.grandTotal)}</div>
                    <div className="text-[10px] text-emerald-400">IVA: {formatCop(inv.taxTotal)}</div>
                  </td>

                  {/* Estado DIAN */}
                  <td className="px-5 py-4 text-center">
                    {inv.dianStatus === 'ACEPTADA' ? (
                      <span className="inline-flex items-center gap-1 rounded-full bg-emerald-500/10 px-2.5 py-1 text-[11px] font-semibold text-emerald-400 border border-emerald-500/20">
                        <CheckCircle2 className="h-3 w-3" />
                        Aceptada
                      </span>
                    ) : inv.dianStatus === 'RECHAZADA' ? (
                      <span className="inline-flex items-center gap-1 rounded-full bg-red-500/10 px-2.5 py-1 text-[11px] font-semibold text-red-400 border border-red-500/20">
                        <AlertCircle className="h-3 w-3" />
                        Rechazada
                      </span>
                    ) : (
                      <span className="inline-flex items-center gap-1 rounded-full bg-amber-500/10 px-2.5 py-1 text-[11px] font-semibold text-amber-400 border border-amber-500/20">
                        <Clock className="h-3 w-3" />
                        {inv.dianStatus}
                      </span>
                    )}
                  </td>

                  {/* Acciones */}
                  <td className="px-5 py-4 text-right">
                    <div className="flex items-center justify-end gap-1.5" onClick={(e) => e.stopPropagation()}>
                      <button
                        onClick={() => setSelectedInvoice(inv)}
                        title="Ver Detalles y CUFE"
                        className="rounded-lg border border-slate-800 bg-slate-900 p-1.5 text-slate-400 hover:text-white hover:border-slate-700"
                      >
                        <Eye className="h-3.5 w-3.5" />
                      </button>
                      <button
                        onClick={(e) => handleDownloadXml(inv, e)}
                        title="Descargar XML UBL 2.1 Firmado"
                        className="rounded-lg border border-slate-800 bg-slate-900 p-1.5 text-slate-400 hover:text-emerald-400 hover:border-emerald-500/30"
                      >
                        <FileCode className="h-3.5 w-3.5" />
                      </button>
                      <button
                        onClick={(e) => handleDownloadPdf(inv, e)}
                        title="Ver PDF Gráfico"
                        className="rounded-lg border border-slate-800 bg-slate-900 p-1.5 text-slate-400 hover:text-blue-400 hover:border-blue-500/30"
                      >
                        <FileDown className="h-3.5 w-3.5" />
                      </button>
                    </div>
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>
    </div>
  );
};