/**
 * 加入游牧中国：确保用户存在
 * 新用户：用默认密码 123456789 创建，支付成功后需修改
 * 老用户：验证密码后登录
 */
import { NextRequest, NextResponse } from "next/server";
import { getPocketBaseConfig } from "@/config/services.config";

const DEFAULT_PASSWORD = "123456789";
const COOKIE_NEEDS_PW = "meetup_needs_password_change";

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;
}

export async function POST(request: NextRequest) {
  try {
    const body = await request.json().catch(() => ({}));
    const email = String(body?.email || "").trim();
    const password = String(body?.password || "").trim();
    if (!email) {
      return NextResponse.json({ ok: false, error: "请输入邮箱" }, { status: 400 });
    }

    const pb = getPocketBaseConfig();
    const tryLogin = async (pwd: string) => {
      const res = await fetch(`${pb.url}/api/collections/users/auth-with-password`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ identity: email, password: pwd }),
      });
      return res;
    };

    let loginRes = await tryLogin(password || DEFAULT_PASSWORD);
    if (loginRes.ok) {
      const data = await loginRes.json();
      const res = NextResponse.json({
        ok: true,
        user_id: data.record?.id,
        token: data.token,
        record: data.record,
        is_new: false,
      });
      return res;
    }

    const errData = await loginRes.json().catch(() => ({}));
    const isNotFound = loginRes.status === 400 && (errData?.message?.includes("Invalid") || errData?.message?.includes("identity"));
    if (!isNotFound && password) {
      return NextResponse.json({ ok: false, error: "密码错误" }, { status: 400 });
    }

    const adminToken = await getAdminToken();
    if (!adminToken) {
      return NextResponse.json({ ok: false, error: "服务配置错误" }, { status: 500 });
    }

    const createRes = await fetch(`${pb.url}/api/collections/users/records`, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        Authorization: `Bearer ${adminToken}`,
      },
      body: JSON.stringify({
        email,
        password: DEFAULT_PASSWORD,
        passwordConfirm: DEFAULT_PASSWORD,
      }),
    });
    if (!createRes.ok) {
      const createErr = await createRes.json().catch(() => ({}));
      if (createRes.status === 400 && createErr?.data?.email?.message?.includes("already")) {
        return NextResponse.json({ ok: false, error: "该邮箱已注册，请输入密码登录" }, { status: 400 });
      }
      return NextResponse.json({ ok: false, error: createErr?.message || "创建账号失败" }, { status: 500 });
    }

    const newUser = await createRes.json();
    const finalLogin = await tryLogin(DEFAULT_PASSWORD);
    if (!finalLogin.ok) {
      return NextResponse.json({ ok: false, error: "登录失败" }, { status: 500 });
    }
    const authData = await finalLogin.json();

    const res = NextResponse.json({
      ok: true,
      user_id: authData.record?.id,
      token: authData.token,
      record: authData.record,
      is_new: true,
    });
    res.cookies.set(COOKIE_NEEDS_PW, "1", { path: "/", maxAge: 60 * 60 * 24 });
    return res;
  } catch (e) {
    console.error("ensure-user error:", e);
    return NextResponse.json({ ok: false, error: "操作失败" }, { status: 500 });
  }
}