import { EventEmitter } from 'node:events';
import { RequestLoggingMiddleware } from './request-logging.middleware';

describe('RequestLoggingMiddleware', () => {
  it('returns a server ID and emits one safe completion event', () => {
    const requestContext = {
      run: jest.fn((_: unknown, next: () => void) => next()),
    };
    const logger = { event: jest.fn() };
    const middleware = new RequestLoggingMiddleware(
      requestContext as never,
      logger as never,
    );
    const response = Object.assign(new EventEmitter(), {
      statusCode: 200,
      locals: {},
      setHeader: jest.fn(),
    });
    const next = jest.fn();

    const request: {
      method: string;
      baseUrl: string;
      route: { path: string };
      header: jest.Mock<string>;
      id?: string;
    } = {
      method: 'GET',
      baseUrl: '/api/v1',
      route: { path: '/accounts/:id' },
      header: jest.fn(() => 'a2dc6fbb-5a48-4c3c-9e3e-4fbf4d638a43'),
    };
    middleware.use(request as never, response as never, next);
    response.emit('finish');

    expect(response.setHeader).toHaveBeenCalledWith(
      'X-Request-ID',
      expect.stringMatching(/^[0-9a-f-]{36}$/i),
    );
    expect(request.id).toMatch(/^[0-9a-f-]{36}$/i);
    expect(requestContext.run).toHaveBeenCalledWith(
      expect.objectContaining({
        clientRequestId: 'a2dc6fbb-5a48-4c3c-9e3e-4fbf4d638a43',
      }),
      next,
    );
    expect(logger.event).toHaveBeenCalledWith(
      'info',
      'http.request.completed',
      expect.objectContaining({ route: '/api/v1/accounts/:id', status: 200 }),
    );
  });
});