import { randomUUID } from 'node:crypto';
import { Test, TestingModule } from '@nestjs/testing';
import { INestApplication } from '@nestjs/common';
import { NestExpressApplication } from '@nestjs/platform-express';
import { App } from 'supertest/types';
import { AppModule } from '../../src/app.module';
import { configureApp } from '../../src/app.config';
import { THROTTLER_NAMESPACE } from '../../src/common/throttler/prisma-throttler.storage';

export interface CreateTestAppOptions {
  /**
   * Rate-limit counter namespace. Defaults to a fresh random one so parallel
   * e2e files never throttle each other; pass the same value to two apps to
   * simulate two pods sharing one counter set.
   */
  throttlerNamespace?: string;
}

export async function createTestApp(
  options: CreateTestAppOptions = {},
): Promise<INestApplication<App>> {
  const moduleFixture: TestingModule = await Test.createTestingModule({
    imports: [AppModule],
  })
    .overrideProvider(THROTTLER_NAMESPACE)
    .useValue(options.throttlerNamespace ?? randomUUID())
    .compile();

  const app = moduleFixture.createNestApplication<NestExpressApplication>();
  configureApp(app);
  await app.init();
  return app;
}