'use client';

import { useState } from 'react';
import { Header } from '@/components/layouts/header';
import { Card, CardContent, CardHeader, CardTitle, Button } from '@horux/shared-ui';
import { useAuthStore } from '@/stores/auth-store';
import { isGlobalAdminRfc, DESPACHO_OVERAGE_PRICE_MENSUAL } from '@horux/shared';
import { Tags, ShieldAlert, Info, AlertTriangle, Check, Loader2, Pencil, X } from 'lucide-react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { apiClient } from '@/lib/api/client';

interface DespachoPlanLimits {
  plan: string;
  nombre: string;
  monthly: number | null;
  firstYear: number | null;
  renewal: number | null;
  permiteMonthly: boolean;
  maxRfcs: number;
  maxUsers: number;
  timbresIncluidosMes: number;
  dbMode: 'BYO' | 'MANAGED';
  permiteServidorBackup: boolean;
  permiteSatIncremental: boolean;
}

const PLAN_ORDER = ['trial', 'mi_empresa', 'mi_empresa_plus', 'business_control', 'business_cloud', 'custom'];

function fmtCurrency(n: number | null): string {
  if (n == null) return '—';
  return `$${n.toLocaleString('es-MX')}`;
}

async function listDespachoCatalogo(): Promise<DespachoPlanLimits[]> {
  const res = await apiClient.get<{ data: DespachoPlanLimits[] }>('/planes/despacho');
  return res.data.data;
}

async function updateDespachoCatalogo(plan: string, patch: Partial<DespachoPlanLimits>): Promise<DespachoPlanLimits> {
  const res = await apiClient.patch<DespachoPlanLimits>(`/planes/despacho/${plan}`, patch);
  return res.data;
}

export default function PreciosSuscripcionPage() {
  const { user } = useAuthStore();
  const queryClient = useQueryClient();
  const isGlobalAdmin = isGlobalAdminRfc(user?.tenantRfc, user?.role, user?.platformRoles);

  const [editingPlan, setEditingPlan] = useState<string | null>(null);
  const [draft, setDraft] = useState<Partial<DespachoPlanLimits>>({});

  const { data: plans = [], isLoading } = useQuery({
    queryKey: ['despacho-catalogo'],
    queryFn: listDespachoCatalogo,
    enabled: isGlobalAdmin,
  });

  const updateMutation = useMutation({
    mutationFn: ({ plan, patch }: { plan: string; patch: Partial<DespachoPlanLimits> }) =>
      updateDespachoCatalogo(plan, patch),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['despacho-catalogo'] });
      setEditingPlan(null);
      setDraft({});
    },
  });

  if (!isGlobalAdmin) {
    return (
      <>
        <Header title="Precios de suscripciones" />
        <main className="p-6">
          <Card>
            <CardContent className="py-12 text-center">
              <ShieldAlert className="h-12 w-12 text-muted-foreground/40 mx-auto mb-3" />
              <p className="font-semibold">Acceso restringido</p>
              <p className="text-sm text-muted-foreground mt-1">Solo admin global puede consultar el catálogo de precios.</p>
            </CardContent>
          </Card>
        </main>
      </>
    );
  }

  const startEdit = (p: DespachoPlanLimits) => {
    setEditingPlan(p.plan);
    setDraft({
      nombre: p.nombre,
      monthly: p.monthly,
      firstYear: p.firstYear,
      renewal: p.renewal,
      permiteMonthly: p.permiteMonthly,
      maxRfcs: p.maxRfcs,
      maxUsers: p.maxUsers,
      timbresIncluidosMes: p.timbresIncluidosMes,
      dbMode: p.dbMode,
      permiteServidorBackup: p.permiteServidorBackup,
      permiteSatIncremental: p.permiteSatIncremental,
    });
  };

  const cancelEdit = () => {
    setEditingPlan(null);
    setDraft({});
  };

  const saveEdit = (plan: string) => {
    updateMutation.mutate({ plan, patch: draft });
  };

  const sorted = [...plans].sort((a, b) => PLAN_ORDER.indexOf(a.plan) - PLAN_ORDER.indexOf(b.plan));

  return (
    <>
      <Header title="Precios de suscripciones" />
      <main className="p-6 space-y-6">
        <Card className="bg-muted/30 border-dashed">
          <CardContent className="py-4 text-sm flex items-start gap-2">
            <Info className="h-4 w-4 text-blue-600 mt-0.5 flex-shrink-0" />
            <div>
              Los planes despacho se almacenan en la tabla <code className="text-xs bg-muted px-1 py-0.5 rounded">despacho_plan_prices</code>.
              Puedes editar precios y limits desde aquí — los cambios aplican a contrataciones nuevas y renovaciones; las suscripciones vigentes
              conservan su precio. Las <strong>features</strong> de cada plan siguen versionadas en código.
            </div>
          </CardContent>
        </Card>

        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2 text-base">
              <Tags className="h-5 w-5" />
              Planes despacho
            </CardTitle>
          </CardHeader>
          <CardContent>
            {isLoading ? (
              <div className="py-8 text-center text-muted-foreground">
                <Loader2 className="h-6 w-6 animate-spin mx-auto mb-2" />
                Cargando catálogo…
              </div>
            ) : (
              <div className="overflow-x-auto">
                <table className="w-full text-sm">
                  <thead>
                    <tr className="border-b text-left text-muted-foreground">
                      <th className="py-2 pr-4">Plan</th>
                      <th className="py-2 pr-4 text-right">Mensual</th>
                      <th className="py-2 pr-4 text-right">Anual 1°</th>
                      <th className="py-2 pr-4 text-right">Renovación</th>
                      <th className="py-2 pr-4 text-right">RFCs</th>
                      <th className="py-2 pr-4 text-right">Usuarios</th>
                      <th className="py-2 pr-4 text-right">Timbres</th>
                      <th className="py-2 pr-4">DB</th>
                      <th className="py-2 pr-4">Backup</th>
                      <th className="py-2 pr-4">SAT Inc</th>
                      <th className="py-2 pr-2"></th>
                    </tr>
                  </thead>
                  <tbody>
                    {sorted.map((p) => {
                      const editing = editingPlan === p.plan;
                      return (
                        <tr key={p.plan} className="border-b last:border-0 hover:bg-muted/40 align-middle">
                          <td className="py-2 pr-4 font-medium">
                            {editing ? (
                              <input className="w-32 px-2 py-1 border rounded text-sm bg-background"
                                value={draft.nombre ?? ''}
                                onChange={(e) => setDraft({ ...draft, nombre: e.target.value })} />
                            ) : (
                              <>{p.nombre} <span className="text-xs text-muted-foreground font-normal">({p.plan})</span></>
                            )}
                          </td>
                          <td className="py-2 pr-4 text-right">
                            {editing ? (
                              <input type="number" className="w-20 px-2 py-1 border rounded text-sm text-right bg-background"
                                value={draft.monthly ?? ''}
                                onChange={(e) => setDraft({ ...draft, monthly: e.target.value === '' ? null : Number(e.target.value) })} />
                            ) : (
                              fmtCurrency(p.monthly)
                            )}
                          </td>
                          <td className="py-2 pr-4 text-right">
                            {editing ? (
                              <input type="number" className="w-24 px-2 py-1 border rounded text-sm text-right bg-background"
                                value={draft.firstYear ?? ''}
                                onChange={(e) => setDraft({ ...draft, firstYear: e.target.value === '' ? null : Number(e.target.value) })} />
                            ) : (
                              fmtCurrency(p.firstYear)
                            )}
                          </td>
                          <td className="py-2 pr-4 text-right">
                            {editing ? (
                              <input type="number" className="w-24 px-2 py-1 border rounded text-sm text-right bg-background"
                                value={draft.renewal ?? ''}
                                onChange={(e) => setDraft({ ...draft, renewal: e.target.value === '' ? null : Number(e.target.value) })} />
                            ) : (
                              fmtCurrency(p.renewal)
                            )}
                          </td>
                          <td className="py-2 pr-4 text-right">
                            {editing ? (
                              <input type="number" className="w-16 px-2 py-1 border rounded text-sm text-right bg-background"
                                value={draft.maxRfcs ?? 0}
                                onChange={(e) => setDraft({ ...draft, maxRfcs: Number(e.target.value) })} />
                            ) : (
                              p.maxRfcs
                            )}
                          </td>
                          <td className="py-2 pr-4 text-right">
                            {editing ? (
                              <input type="number" className="w-16 px-2 py-1 border rounded text-sm text-right bg-background"
                                value={draft.maxUsers ?? 0}
                                onChange={(e) => setDraft({ ...draft, maxUsers: Number(e.target.value) })} />
                            ) : (
                              p.maxUsers === -1 ? '∞' : p.maxUsers
                            )}
                          </td>
                          <td className="py-2 pr-4 text-right">
                            {editing ? (
                              <input type="number" className="w-16 px-2 py-1 border rounded text-sm text-right bg-background"
                                value={draft.timbresIncluidosMes ?? 0}
                                onChange={(e) => setDraft({ ...draft, timbresIncluidosMes: Number(e.target.value) })} />
                            ) : (
                              p.timbresIncluidosMes
                            )}
                          </td>
                          <td className="py-2 pr-4">
                            {editing ? (
                              <select className="px-2 py-1 border rounded text-sm bg-background"
                                value={draft.dbMode ?? 'MANAGED'}
                                onChange={(e) => setDraft({ ...draft, dbMode: e.target.value as 'BYO' | 'MANAGED' })}>
                                <option value="MANAGED">MANAGED</option>
                                <option value="BYO">BYO</option>
                              </select>
                            ) : (
                              <span className="text-xs px-2 py-0.5 rounded bg-muted">{p.dbMode}</span>
                            )}
                          </td>
                          <td className="py-2 pr-4 text-center">
                            {editing ? (
                              <input type="checkbox"
                                checked={draft.permiteServidorBackup ?? false}
                                onChange={(e) => setDraft({ ...draft, permiteServidorBackup: e.target.checked })} />
                            ) : (
                              p.permiteServidorBackup ? <Check className="h-4 w-4 text-green-600 inline" /> : <span className="text-muted-foreground">—</span>
                            )}
                          </td>
                          <td className="py-2 pr-4 text-center">
                            {editing ? (
                              <input type="checkbox"
                                checked={draft.permiteSatIncremental ?? false}
                                onChange={(e) => setDraft({ ...draft, permiteSatIncremental: e.target.checked })} />
                            ) : (
                              p.permiteSatIncremental ? <Check className="h-4 w-4 text-green-600 inline" /> : <span className="text-muted-foreground">—</span>
                            )}
                          </td>
                          <td className="py-2 pr-2">
                            {editing ? (
                              <div className="flex gap-1 justify-end">
                                <Button size="sm" variant="default" onClick={() => saveEdit(p.plan)} disabled={updateMutation.isPending}>
                                  {updateMutation.isPending ? <Loader2 className="h-3 w-3 animate-spin" /> : <Check className="h-3 w-3" />}
                                </Button>
                                <Button size="sm" variant="ghost" onClick={cancelEdit} disabled={updateMutation.isPending}>
                                  <X className="h-3 w-3" />
                                </Button>
                              </div>
                            ) : (
                              <Button size="sm" variant="ghost" onClick={() => startEdit(p)}>
                                <Pencil className="h-3 w-3" />
                              </Button>
                            )}
                          </td>
                        </tr>
                      );
                    })}
                  </tbody>
                </table>
              </div>
            )}
          </CardContent>
        </Card>

        {updateMutation.isError && (
          <Card className="bg-red-50 dark:bg-red-950/30 border-red-200">
            <CardContent className="py-3 text-sm text-red-700 dark:text-red-400">
              Error guardando: {String((updateMutation.error as any)?.response?.data?.message || updateMutation.error)}
            </CardContent>
          </Card>
        )}

        <Card className="bg-amber-50 dark:bg-amber-950/30 border-amber-200 dark:border-amber-900/50">
          <CardContent className="py-4 text-sm flex items-start gap-2">
            <AlertTriangle className="h-4 w-4 text-amber-600 mt-0.5 flex-shrink-0" />
            <div className="space-y-1">
              <p>
                <strong>Cobro adicional por RFC extra:</strong>{' '}
                <span className="font-mono">${DESPACHO_OVERAGE_PRICE_MENSUAL}/mes</span> por
                cada contribuyente que exceda el límite. Solo aplica a
                <strong> Business Control</strong> y <strong>Enterprise</strong>; los planes
                Mi Empresa tienen límite duro de 1 RFC.
              </p>
              <p className="text-muted-foreground">
                <strong>maxUsers = -1</strong> significa ilimitado. <strong>trial</strong> y <strong>custom</strong> no tienen precio fijo
                (trial es gratis 30 días; custom se asigna con monto variable al provisionar).
              </p>
              <p className="text-muted-foreground">
                <strong>SAT Inc</strong> habilita 3 syncs SAT extra al día (11:00, 15:00, 19:00) además del daily de las 03:00.
                Ventana de 8h por sync, deduplicado por UUID. Latencia típica de un CFDI ~1-2h en horario laboral
                vs ~24h con solo el daily.
              </p>
            </div>
          </CardContent>
        </Card>
      </main>
    </>
  );
}
