import { Test } from '@nestjs/testing';
import IORedis from 'ioredis';
import { LoggerModule } from 'nestjs-pino';
import { RedisModule } from './redis.module';
import { REDIS_CLIENT } from './redis.token';

const ORIGINAL_REDIS_URL = process.env['REDIS_URL'];

async function compile() {
  return Test.createTestingModule({
    imports: [LoggerModule.forRoot({ pinoHttp: { level: 'silent' } }), RedisModule],
  }).compile();
}

describe('RedisModule', () => {
  afterEach(async () => {
    if (ORIGINAL_REDIS_URL === undefined) {
      delete process.env['REDIS_URL'];
    } else {
      process.env['REDIS_URL'] = ORIGINAL_REDIS_URL;
    }
  });

  it('provides an ioredis client via the REDIS_CLIENT token', async () => {
    // A well-formed but unreachable URL — `ioredis` constructs the
    // client lazily so the test never opens a real socket.
    process.env['REDIS_URL'] = 'redis://default:test-pass@127.0.0.1:65535/0';
    const ref = await compile();
    try {
      const client = ref.get<IORedis>(REDIS_CLIENT);
      expect(client).toBeInstanceOf(IORedis);
    } finally {
      ref.get<IORedis>(REDIS_CLIENT).disconnect();
      await ref.close();
    }
  });

  it('fails to compile when REDIS_URL is missing', async () => {
    delete process.env['REDIS_URL'];
    await expect(compile()).rejects.toThrow(/REDIS_URL is not set/);
  });
});