import { afterEach, describe, expect, it, vi } from 'vitest';
import { fetchState } from './useGameState';

// The hook's fetch logic (lib/useGameState.ts) against a mocked global fetch — the polling
// loop itself is plain setInterval and covered by e2e (panes.spec.ts renders from it).

const SNAPSHOT = {
  account: { cash: 20_000, reputation: 10 },
  simState: { clockMs: 1_750_000_000_000 },
  planes: [],
  packages: [],
};

afterEach(() => {
  vi.unstubAllGlobals();
});

describe('fetchState', () => {
  it('GETs /api/state with no-store and returns the parsed snapshot on success', async () => {
    const fetchMock = vi.fn(async () => ({ ok: true, status: 200, json: async () => SNAPSHOT }));
    vi.stubGlobal('fetch', fetchMock);

    await expect(fetchState()).resolves.toEqual(SNAPSHOT);
    expect(fetchMock).toHaveBeenCalledTimes(1);
    // No stored session in node → empty headers object (v1.1.0, ISS-107).
    expect(fetchMock).toHaveBeenCalledWith('/api/state', { cache: 'no-store', headers: {} });
  });

  it('sends the stored session as X-Flight-Session when one exists (v1.1.0)', async () => {
    vi.stubGlobal('window', {
      localStorage: { getItem: (k: string) => (k === 'flight.session' ? 'sid-123' : null), removeItem: () => {} },
    });
    const fetchMock = vi.fn(async () => ({ ok: true, status: 200, json: async () => SNAPSHOT }));
    vi.stubGlobal('fetch', fetchMock);

    await fetchState();
    expect(fetchMock).toHaveBeenCalledWith('/api/state', { cache: 'no-store', headers: { 'X-Flight-Session': 'sid-123' } });
  });

  it('throws with the HTTP status on a non-2xx response', async () => {
    vi.stubGlobal('fetch', vi.fn(async () => ({ ok: false, status: 500, json: async () => ({}) })));
    await expect(fetchState()).rejects.toThrow('GET /api/state → HTTP 500');
  });

  it('throws on a network failure (no response at all)', async () => {
    vi.stubGlobal('fetch', vi.fn(async () => {
      throw new Error('fetch failed');
    }));
    await expect(fetchState()).rejects.toThrow('fetch failed');
  });
});