'use client';

import React, { useEffect, useState } from 'react';
import Link from 'next/link';
import {
  AlertTriangle,
  Bell,
  CheckCircle2,
  CircleDashed,
  ExternalLink,
  Plug,
  XCircle,
} from 'lucide-react';

type PortfolioRow = {
  id: string;
  name: string;
  slug: string;
  stats: {
    connected: number;
    errors: number;
    pending: number;
    totalProviders: number;
    health: string;
  };
};

type AlertRow = {
  id: string;
  title: string;
  body?: string | null;
  severity: string;
  tenant_id?: string | null;
  href?: string | null;
  created_at: string;
  read_at?: string | null;
};

function healthBadge(h: string) {
  if (h === 'ok')
    return (
      <span className="inline-flex items-center gap-1 text-[10px] uppercase tracking-wider text-emerald-400">
        <CheckCircle2 className="w-3 h-3" /> OK
      </span>
    );
  if (h === 'critical')
    return (
      <span className="inline-flex items-center gap-1 text-[10px] uppercase tracking-wider text-red-400">
        <XCircle className="w-3 h-3" /> Error
      </span>
    );
  if (h === 'warning')
    return (
      <span className="inline-flex items-center gap-1 text-[10px] uppercase tracking-wider text-amber-400">
        <AlertTriangle className="w-3 h-3" /> Pendiente
      </span>
    );
  return (
    <span className="inline-flex items-center gap-1 text-[10px] uppercase tracking-wider text-gray-500">
      <CircleDashed className="w-3 h-3" /> Sin conectar
    </span>
  );
}

export default function AgencyPortfolioBoard() {
  const [portfolio, setPortfolio] = useState<PortfolioRow[]>([]);
  const [alerts, setAlerts] = useState<AlertRow[]>([]);
  const [warning, setWarning] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);

  async function load() {
    setLoading(true);
    const res = await fetch('/api/admin/portfolio');
    const data = await res.json();
    setPortfolio(data.portfolio || []);
    setAlerts((data.alerts || []).filter((a: AlertRow) => !a.read_at));
    setWarning(data.warning || null);
    setLoading(false);
  }

  useEffect(() => {
    void load();
  }, []);

  async function enterTenant(id: string) {
    await fetch('/api/admin/active-tenant', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ tenantId: id }),
    });
    window.location.href = '/dashboard/kpis';
  }

  async function dismiss(id: string) {
    await fetch('/api/admin/alerts', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ id, markRead: true }),
    });
    setAlerts((prev) => prev.filter((a) => a.id !== id));
  }

  if (loading) {
    return <p className="text-sm text-gray-500">Cargando portafolio…</p>;
  }

  return (
    <div className="space-y-6">
      {warning && (
        <p className="text-xs text-amber-400/90 border border-amber-500/20 rounded-lg px-3 py-2">
          {warning}
        </p>
      )}

      {alerts.length > 0 && (
        <section className="space-y-2">
          <div className="flex items-center gap-2 text-sm font-semibold text-white">
            <Bell className="w-4 h-4 text-amber-400" />
            Alertas ({alerts.length})
          </div>
          <ul className="space-y-2">
            {alerts.map((a) => (
              <li
                key={a.id}
                className={`flex items-start justify-between gap-3 rounded-lg border px-4 py-3 ${
                  a.severity === 'critical'
                    ? 'border-red-500/30 bg-red-500/5'
                    : a.severity === 'warning'
                      ? 'border-amber-500/30 bg-amber-500/5'
                      : 'border-gray-800 bg-[#111827]'
                }`}
              >
                <div>
                  <p className="text-sm text-white font-medium">{a.title}</p>
                  {a.body && (
                    <p className="text-xs text-gray-400 mt-0.5">{a.body}</p>
                  )}
                </div>
                <div className="flex items-center gap-2 shrink-0">
                  {a.href && (
                    <Link
                      href={a.href}
                      className="text-xs text-brand-400 hover:underline"
                    >
                      Ver
                    </Link>
                  )}
                  <button
                    type="button"
                    onClick={() => dismiss(a.id)}
                    className="text-[10px] uppercase tracking-wider text-gray-500 hover:text-gray-300"
                  >
                    OK
                  </button>
                </div>
              </li>
            ))}
          </ul>
        </section>
      )}

      <section className="space-y-3">
        <div className="flex items-center justify-between">
          <h3 className="text-sm font-semibold text-white flex items-center gap-2">
            <Plug className="w-4 h-4 text-brand-400" />
            Portafolio · estado de conexiones
          </h3>
          <p className="text-[11px] text-gray-500">
            Meta · Google Ads · GA4 · GSC · GTM · CRM · Email
          </p>
        </div>

        {portfolio.length === 0 ? (
          <p className="text-sm text-gray-500">
            No hay clientes. Usa «Dar de Alta Cliente» abajo.
          </p>
        ) : (
          <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
            {portfolio.map((t) => (
              <div
                key={t.id}
                className="rounded-xl border border-gray-800 bg-[#111827] p-4 flex flex-col gap-3"
              >
                <div className="flex items-start justify-between gap-2">
                  <div>
                    <p className="text-sm font-semibold text-white">{t.name}</p>
                    <p className="text-[11px] text-gray-500">{t.slug}</p>
                  </div>
                  {healthBadge(t.stats.health)}
                </div>
                <p className="text-xs text-gray-400">
                  {t.stats.connected}/{t.stats.totalProviders} conectadas
                  {t.stats.errors > 0 && (
                    <span className="text-red-400">
                      {' '}
                      · {t.stats.errors} error
                    </span>
                  )}
                </p>
                <div className="flex flex-wrap gap-2 mt-auto">
                  <button
                    type="button"
                    onClick={() => enterTenant(t.id)}
                    className="text-xs font-medium px-3 py-1.5 rounded-lg bg-brand-500/90 hover:bg-brand-500 text-white"
                  >
                    Entrar (superadmin)
                  </button>
                  <Link
                    href={`/dashboard/agencia/cliente/${t.id}`}
                    className="inline-flex items-center gap-1 text-xs font-medium px-3 py-1.5 rounded-lg border border-gray-700 text-gray-300 hover:border-gray-500 hover:text-white"
                  >
                    Integraciones
                    <ExternalLink className="w-3 h-3" />
                  </Link>
                </div>
              </div>
            ))}
          </div>
        )}
      </section>
    </div>
  );
}