import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest';
import { fetchEventStats, clearStatsCache } from '../services/statsApi';

const fetchMock = vi.fn();

global.fetch = fetchMock as unknown as typeof fetch;

describe('fetchEventStats', () => {
  beforeEach(() => {
    fetchMock.mockReset();
    clearStatsCache();
  });

  afterEach(() => {
    clearStatsCache();
  });

  it('returns cached stats on 304', async () => {
    fetchMock.mockResolvedValueOnce(
      new Response(JSON.stringify({
        online_guests: 4,
        tasks_solved: 1,
        guest_count: 12,
        likes_count: 48,
        latest_photo_at: '2024-01-01T00:00:00Z',
      }), {
        status: 200,
        headers: { ETag: '"demo"' },
      })
    );

    const first = await fetchEventStats('demo');
    expect(first.onlineGuests).toBe(4);
    expect(first.guestCount).toBe(12);
    expect(first.likesCount).toBe(48);

    fetchMock.mockResolvedValueOnce(new Response(null, { status: 304, headers: { ETag: '"demo"' } }));
    const second = await fetchEventStats('demo');
    expect(second).toEqual(first);
  });
});