// services/api/test/health.e2e-spec.ts
// e2e 冒烟：验证 e2e 工装（Nest testing module + supertest + 根 .env 加载）可用。
// 不监听端口：app.init() 后直接对 app.getHttpServer() 发请求。
// 全局前缀与 main-cn.ts 共用 src/shared/constants 的 API_PREFIX（Task 7 遗留项⑥）。
import { type INestApplication } from '@nestjs/common';
import { Test } from '@nestjs/testing';
import request from 'supertest';
import { AppCnModule } from '../src/app-cn.module';
import { API_PREFIX } from '../src/shared/constants';
import { resetDb } from './reset';

describe(`GET /${API_PREFIX}/health (e2e)`, () => {
  let app: INestApplication;

  beforeAll(async () => {
    await resetDb();
    const moduleRef = await Test.createTestingModule({
      imports: [AppCnModule],
    }).compile();
    app = moduleRef.createNestApplication();
    app.setGlobalPrefix(API_PREFIX);
    await app.init();
  });

  afterAll(async () => {
    await app.close();
  });

  it('responds 200 {"status":"ok"}', async () => {
    const res = await request(app.getHttpServer()).get(`/${API_PREFIX}/health`);
    expect(res.status).toBe(200);
    expect(res.body).toEqual({ status: 'ok' });
  });

  it('sets x-request-id response header (generated when absent)', async () => {
    const res = await request(app.getHttpServer()).get(`/${API_PREFIX}/health`);
    const requestId = res.headers['x-request-id'];
    expect(typeof requestId).toBe('string');
    expect(requestId.length ?? 0).toBeGreaterThan(0);
  });

  it('echoes incoming x-request-id header', async () => {
    const res = await request(app.getHttpServer())
      .get(`/${API_PREFIX}/health`)
      .set('x-request-id', 'e2e-fixed-request-id');
    expect(res.headers['x-request-id']).toBe('e2e-fixed-request-id');
  });

  it('replaces an over-long incoming x-request-id (>128 chars) with a fresh one', async () => {
    const overlong = 'z'.repeat(200);
    const res = await request(app.getHttpServer())
      .get(`/${API_PREFIX}/health`)
      .set('x-request-id', overlong);
    const requestId = res.headers['x-request-id'];
    expect(typeof requestId).toBe('string');
    expect(requestId).not.toBe(overlong);
    expect((requestId as string).length).toBeLessThanOrEqual(128);
  });
});