import { auth } from "../lib/auth";
import { ownerFilter } from "../lib/authz";
import { getClosed, resolveScopeOwnerId } from "../lib/queries";
import LoginPrompt from "../components/LoginPrompt";
import ErrorNotice from "../components/ErrorNotice";
import { money, money2 } from "../lib/constants";
import { getMetaGlobal } from "../lib/metas";

export const dynamic = "force-dynamic";

const MESES_A_MOSTRAR = 6;

function lastMonths(n) {
  const out = [];
  const d = new Date();
  for (let i = n - 1; i >= 0; i--) {
    const dt = new Date(d.getFullYear(), d.getMonth() - i, 1);
    out.push(`${dt.getFullYear()}-${String(dt.getMonth() + 1).padStart(2, "0")}`);
  }
  return out;
}

export default async function TendenciaPage({ searchParams }) {
  const session = await auth();
  if (!session?.email) return <LoginPrompt />;

  const { owner } = await searchParams;
  const scope = ownerFilter(session, owner);
  const meses = lastMonths(MESES_A_MOSTRAR);

  const metaGlobal = getMetaGlobal();
  let porMes;
  try {
    const { ownerId } = await resolveScopeOwnerId(scope, session.accessToken);
    porMes = await Promise.all(
      meses.map(async (m) => {
        const [won, lost] = await Promise.all([
          getClosed(session.accessToken, scope, 1, m, ownerId),
          getClosed(session.accessToken, scope, 2, m, ownerId),
        ]);
        const sumW = won.reduce((a, o) => a + (o.actual || 0), 0);
        return {
          mes: m,
          won: won.length,
          lost: lost.length,
          sumW,
          arpu: won.length ? sumW / won.length : 0,
          conv: won.length + lost.length ? Math.round((won.length / (won.length + lost.length)) * 100) : 0,
          cumpl: metaGlobal ? Math.round((sumW / metaGlobal) * 100) : null,
        };
      })
    );
  } catch (error) {
    return <ErrorNotice error={error} />;
  }

  const maxSumW = Math.max(...porMes.map((m) => m.sumW), 1);

  return (
    <div style={{ padding: 24 }}>
      <h2>Tendencia</h2>
      <p className="hint" style={{ marginBottom: 16 }}>
        Últimos {MESES_A_MOSTRAR} meses, calculado en vivo desde Dynamics. No incluye el análisis narrativo del
        tablero anterior (era específico de un semestre puntual) — solo las cifras.
      </p>

      <div className="panel">
        <h3>Ganadas ($) por mes</h3>
        {porMes.map((m) => (
          <div className="row static" key={m.mes}>
            <div className="bl">
              <span className="nm">{m.mes}</span>
            </div>
            <div className="bar-cell">
              <div className="bar-fill" style={{ width: `${((m.sumW / maxSumW) * 100).toFixed(1)}%` }} />
            </div>
            <span className="v">{m.won}</span>
            <span className="c">{money(m.sumW)}</span>
          </div>
        ))}
      </div>

      <div className="tw" style={{ marginTop: 18 }}>
        <div className="ts">
          <table>
            <thead>
              <tr>
                <th>Mes</th>
                <th className="num">Ganadas #</th>
                <th className="num">Ganadas $</th>
                <th className="num">ARPU</th>
                <th className="num">Perdidas #</th>
                <th className="num">Conversión</th>
                <th className="num">Cumpl. (meta {money(metaGlobal)})</th>
              </tr>
            </thead>
            <tbody>
              {porMes.map((m) => (
                <tr key={m.mes}>
                  <td>{m.mes}</td>
                  <td className="num">{m.won}</td>
                  <td className="num">{money2(m.sumW)}</td>
                  <td className="num">{money2(m.arpu)}</td>
                  <td className="num">{m.lost}</td>
                  <td className="num">{m.conv}%</td>
                  <td className="num">{m.cumpl != null ? `${m.cumpl}%` : "n/d"}</td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      </div>
    </div>
  );
}