'use client';

import { useState } from 'react';
import { useQuery } from '@tanstack/react-query';
import { Button, Input, Label, Card, CardContent, Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from '@horux/shared-ui';
import { useContribuyentes, useCreateContribuyente, useUpdateContribuyente, useDeactivateContribuyente } from '@/lib/hooks/use-contribuyentes';
import type { CreateContribuyenteData } from '@/lib/api/contribuyentes';
import { useAuthStore } from '@/stores/auth-store';
import { apiClient } from '@/lib/api/client';
import { Plus, Pencil, Trash2, Building2, Sparkles } from 'lucide-react';
import { AddonsDialog } from './addons-dialog';
import { DESPACHO_PLANS } from '@horux/shared';

const TRIAL_LIMIT_TOOLTIP = 'Límite de contribuyentes para la prueba gratuita, para continuar agregando contribuyentes, selecciona un plan.';

export default function ContribuyentesPage() {
  const { user } = useAuthStore();
  const { data: contribuyentes, isLoading } = useContribuyentes();
  const createMut = useCreateContribuyente();
  const updateMut = useUpdateContribuyente();
  const deactivateMut = useDeactivateContribuyente();

  const [showDialog, setShowDialog] = useState(false);
  const [editingId, setEditingId] = useState<string | null>(null);
  const [form, setForm] = useState<CreateContribuyenteData>({ rfc: '', razonSocial: '' });
  const [assignSelf, setAssignSelf] = useState(true);
  const [addonsTarget, setAddonsTarget] = useState<{ id: string; nombre: string } | null>(null);

  // Trial gate: durante el periodo de prueba el despacho no puede agregar más
  // de 5 contribuyentes activos. El backend valida también; aquí solo se
  // deshabilita el botón con tooltip explicativo.
  const { data: planInfo } = useQuery({
    queryKey: ['my-plan-info'],
    queryFn: () => apiClient.get<{ plan: string; isTrialActive: boolean }>('/despachos/me/plan').then(r => r.data),
  });
  const activeCount = (contribuyentes ?? []).filter((c: any) => c.active !== false).length;
  const trialAtLimit = (planInfo?.isTrialActive ?? false) && activeCount >= 5;

  // Contador de RFCs disponibles en el plan
  const planKey = planInfo?.plan as keyof typeof DESPACHO_PLANS | undefined;
  const planMaxRfcs = planKey ? DESPACHO_PLANS[planKey]?.maxRfcs ?? undefined : undefined;
  const rfcCounterText = (() => {
    if (planInfo?.isTrialActive) return `${activeCount} de 5 RFCs`;
    if (planMaxRfcs != null && planMaxRfcs < 0) return `${activeCount} RFCs`;
    if (planMaxRfcs !== undefined) return `${activeCount} de ${planMaxRfcs} RFCs`;
    return `${activeCount} RFCs`;
  })();

  const resetForm = () => { setForm({ rfc: '', razonSocial: '' }); setAssignSelf(true); setShowDialog(false); setEditingId(null); };

  const handleSave = async () => {
    try {
      if (editingId) {
        await updateMut.mutateAsync({ id: editingId, data: form });
      } else {
        const created = await createMut.mutateAsync({
          ...form,
          supervisorUserId: assignSelf ? user?.id : undefined,
        });
        // Overage Business Cloud: si el 4º+ RFC disparó un nuevo addon, abre
        // MercadoPago para autorizar el cobro recurrente mensual de $45/RFC.
        if (created.overage?.action === 'created' && created.overage.paymentUrl) {
          alert(`Se agregó un cobro mensual de $45 por contribuyente adicional (${created.overage.overageCount} extra${created.overage.overageCount === 1 ? '' : 's'}). Autoriza el pago en MercadoPago.`);
          window.open(created.overage.paymentUrl, '_blank');
        } else if (created.overage?.action === 'updated') {
          alert(`Se actualizó el cobro mensual de contribuyentes adicionales a ${created.overage.overageCount} extra${created.overage.overageCount === 1 ? '' : 's'} ($${created.overage.overageCount * 45}/mes).`);
        }
      }
      resetForm();
    } catch (err: any) { alert(err.response?.data?.message || 'Error'); }
  };

  const handleDeactivate = async (id: string, rfc: string) => {
    if (!confirm(`¿Desactivar contribuyente ${rfc}?`)) return;
    try {
      const result = await deactivateMut.mutateAsync(id);
      if (result.overage?.action === 'cancelled') {
        alert('Se canceló el cobro mensual de contribuyente adicional (volviste a los 3 incluidos).');
      } else if (result.overage?.action === 'updated') {
        alert(`El cobro de contribuyentes adicionales se actualizó a ${result.overage.overageCount} extra${result.overage.overageCount === 1 ? '' : 's'} ($${result.overage.overageCount * 45}/mes).`);
      }
    } catch (err: any) { alert(err.response?.data?.message || 'Error'); }
  };

  const openEdit = (c: any) => {
    setForm({ rfc: c.rfc, razonSocial: c.nombre });
    setEditingId(c.id);
    setShowDialog(true);
  };

  const canCreate = user?.role === 'owner' || user?.role === 'cfo' || user?.role === 'supervisor';

  return (
    <div className="p-6 space-y-6 max-w-7xl mx-auto">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold">Contribuyentes</h1>
          <p className="text-sm text-muted-foreground">RFCs que gestiona tu despacho · {rfcCounterText}</p>
        </div>
        {canCreate && (
          <Button
            onClick={() => { resetForm(); setShowDialog(true); }}
            disabled={trialAtLimit}
            title={trialAtLimit ? TRIAL_LIMIT_TOOLTIP : undefined}
            className="flex items-center gap-2"
          >
            <Plus className="h-4 w-4" /> Agregar RFC
          </Button>
        )}
      </div>

      {isLoading ? <p className="text-muted-foreground">Cargando...</p> : !contribuyentes || contribuyentes.length === 0 ? (
        <Card><CardContent className="flex flex-col items-center justify-center py-12 text-center">
          <Building2 className="h-12 w-12 text-muted-foreground mb-4" />
          <h3 className="text-lg font-semibold">Sin contribuyentes</h3>
          <p className="text-sm text-muted-foreground mt-1 mb-4">Agrega el primer RFC para empezar.</p>
          {canCreate && (
            <Button
              onClick={() => { resetForm(); setShowDialog(true); }}
              disabled={trialAtLimit}
              title={trialAtLimit ? TRIAL_LIMIT_TOOLTIP : undefined}
            >
              Agregar primer RFC
            </Button>
          )}
        </CardContent></Card>
      ) : (
        <div className="grid gap-3 lg:grid-cols-2 3xl:grid-cols-3 4xl:grid-cols-4">{contribuyentes.map((c) => (
          <Card key={c.id}><CardContent className="flex items-center justify-between py-4 px-6">
            <div>
              <p className="font-semibold">{c.nombre}</p>
              <p className="text-sm text-muted-foreground font-mono">{c.rfc}</p>
              {c.regimenFiscal && <p className="text-xs text-muted-foreground mt-1">Régimen: {c.regimenFiscal}</p>}
              {c.supervisorNombre && <p className="text-xs text-muted-foreground mt-1">Supervisor: {c.supervisorNombre}</p>}
            </div>
            <div className="flex items-center gap-2">
              {(user?.role === 'owner' || user?.role === 'cfo') && (
                <Button variant="ghost" size="sm" onClick={() => setAddonsTarget({ id: c.id, nombre: c.nombre })} title="Add-ons"><Sparkles className="h-4 w-4" /></Button>
              )}
              <Button variant="ghost" size="sm" onClick={() => openEdit(c)}><Pencil className="h-4 w-4" /></Button>
              {user?.role === 'owner' && (
                <Button variant="ghost" size="sm" onClick={() => handleDeactivate(c.id, c.rfc)} className="text-destructive hover:text-destructive"><Trash2 className="h-4 w-4" /></Button>
              )}
            </div>
          </CardContent></Card>
        ))}</div>
      )}

      <AddonsDialog target={addonsTarget} onClose={() => setAddonsTarget(null)} />

      <Dialog open={showDialog} onOpenChange={() => resetForm()}>
        <DialogContent>
          <DialogHeader><DialogTitle>{editingId ? 'Editar contribuyente' : 'Agregar contribuyente'}</DialogTitle></DialogHeader>
          <div className="space-y-4 py-4">
            <div><Label>RFC</Label><Input value={form.rfc} onChange={(e) => setForm((p) => ({ ...p, rfc: e.target.value }))} placeholder="ABC010203XY1" maxLength={13} disabled={!!editingId} /></div>
            <div><Label>Razón social</Label><Input value={form.razonSocial} onChange={(e) => setForm((p) => ({ ...p, razonSocial: e.target.value }))} placeholder="Empresa SA de CV" /></div>
            {!editingId && (
              <div className="flex items-center gap-2">
                <input
                  type="checkbox"
                  id="assignSelf"
                  checked={assignSelf}
                  onChange={(e) => setAssignSelf(e.target.checked)}
                  className="h-4 w-4"
                />
                <label htmlFor="assignSelf" className="text-sm text-muted-foreground">
                  Asignarme como supervisor de este RFC
                </label>
              </div>
            )}
          </div>
          <DialogFooter>
            <Button variant="outline" onClick={resetForm}>Cancelar</Button>
            <Button onClick={handleSave} disabled={createMut.isPending || updateMut.isPending}>{editingId ? 'Guardar' : 'Agregar'}</Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}