import {
  beforeEach,
  describe,
  expect,
  it,
  vi
} from 'vitest';

import { AttachmentChunkAckService } from './attachment-chunk-ack.service';

describe('AttachmentChunkAckService', () => {
  let service: AttachmentChunkAckService;

  beforeEach(() => {
    service = new AttachmentChunkAckService();
  });

  it('resolves a waiter when the matching chunk ack arrives', async () => {
    const waitPromise = service.waitForAck('msg-1', 'file-1', 0, 1_000);

    service.resolveAck('msg-1', 'file-1', 0);

    await expect(waitPromise).resolves.toBeUndefined();
  });

  it('times out when no ack arrives', async () => {
    vi.useFakeTimers();

    const waitPromise = service.waitForAck('msg-1', 'file-1', 1, 50);

    vi.advanceTimersByTime(51);

    await expect(waitPromise).rejects.toThrow('attachment chunk ack timeout');

    vi.useRealTimers();
  });
});