import { NextRequest, NextResponse } from "next/server";
import { getPocketBaseConfig, SITE_ID, VIP_MASTER_SITE_ID } from "@/config/services.config";

const COOKIE_NAME = "pb_session";

async function getAdminToken(): Promise<string | null> {
  const email = process.env.POCKETBASE_EMAIL;
  const password = process.env.POCKETBASE_PASSWORD;
  if (!email || !password) return null;
  const pb = getPocketBaseConfig();
  const res = await fetch(`${pb.url}/api/admins/auth-with-password`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ identity: email, password }),
  });
  if (!res.ok) return null;
  const data = await res.json();
  return data?.token ?? null;
}

/** 检查单条 site_vip 是否有效 */
function isValidVip(record: { expires_at?: string | null } | null): boolean {
  if (!record) return false;
  const now = new Date().toISOString();
  return !(record.expires_at && record.expires_at < now);
}

export async function GET(request: NextRequest) {
  const cookie = request.cookies.get(COOKIE_NAME)?.value;
  if (!cookie) {
    return NextResponse.json({ ok: true, vip: false });
  }
  try {
    const payload = JSON.parse(Buffer.from(cookie, "base64url").toString("utf-8"));
    const userId = payload?.userId;
    if (!userId) return NextResponse.json({ ok: true, vip: false });

    const token = await getAdminToken();
    if (!token) return NextResponse.json({ ok: true, vip: false });

    const pb = getPocketBaseConfig();
    // 1) 本专题站 VIP（site_id = SITE_ID）2) vip 站 master VIP（site_id = vip）可解锁所有 digital 专题站
    const filter = `user_id = "${userId}" && (site_id = "${SITE_ID}" || site_id = "${VIP_MASTER_SITE_ID}")`;
    const res = await fetch(
      `${pb.url}/api/collections/site_vip/records?filter=${encodeURIComponent(filter)}&perPage=2&sort=-expires_at`,
      { headers: { Authorization: `Bearer ${token}` } }
    );
    if (!res.ok) return NextResponse.json({ ok: true, vip: false });
    const data = await res.json();
    const items = data?.items ?? [];
    const record = items.find((r: { expires_at?: string | null }) => isValidVip(r));
    const vip = !!record;
    return NextResponse.json({
      ok: true,
      vip,
      expires_at: record?.expires_at ?? null,
    });
  } catch {
    return NextResponse.json({ ok: true, vip: false });
  }
}