import {
  resetRefreshLockForTests,
  withRefreshLock,
} from '@/core/auth/refresh-lock';

describe('withRefreshLock', () => {
  beforeEach(() => {
    resetRefreshLockForTests();
  });

  it('runs concurrent callers through a single in-flight refresh', async () => {
    let runs = 0;
    const fn = jest.fn(async () => {
      runs += 1;
      await new Promise((resolve) => setTimeout(resolve, 20));
      return 'ok';
    });

    const [a, b, c] = await Promise.all([
      withRefreshLock(fn),
      withRefreshLock(fn),
      withRefreshLock(fn),
    ]);

    expect(a).toBe('ok');
    expect(b).toBe('ok');
    expect(c).toBe('ok');
    expect(fn).toHaveBeenCalledTimes(1);
    expect(runs).toBe(1);
  });

  it('propagates errors to queued waiters', async () => {
    const fn = jest.fn(async () => {
      throw new Error('refresh failed');
    });

    const results = await Promise.allSettled([
      withRefreshLock(fn),
      withRefreshLock(fn),
    ]);

    expect(fn).toHaveBeenCalledTimes(1);
    expect(results[0].status).toBe('rejected');
    expect(results[1].status).toBe('rejected');
  });
});