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

/**
 * auth-actions.test (fetchSessionState) — Sitzungswaechter (quick-260917-gyd).
 *
 * next/headers wird gemockt (cookies() liefert ein Promise auf ein Objekt
 * mit get/set/delete aus vi.hoisted, Muster: module-access.test.tsx),
 * next/navigation ebenfalls (redirect ist hier ungenutzt, muss aber
 * importierbar bleiben), fetch per vi.stubGlobal. Die 'use server'-
 * Direktive ist unter vitest wirkungslos.
 */

const { cookieGet, cookieSet, cookieDelete } = vi.hoisted(() => ({
  cookieGet: vi.fn(),
  cookieSet: vi.fn(),
  cookieDelete: vi.fn(),
}));

vi.mock('next/headers', () => ({
  cookies: () =>
    Promise.resolve({
      get: cookieGet,
      set: cookieSet,
      delete: cookieDelete,
    }),
}));

vi.mock('next/navigation', () => ({
  redirect: vi.fn(),
}));

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

describe('fetchSessionState', () => {
  it('Test 1: kein Cookie -> unauthenticated, kein fetch', async () => {
    cookieGet.mockReturnValue(undefined);
    const fetchMock = vi.fn();
    vi.stubGlobal('fetch', fetchMock);

    const { fetchSessionState } = await import('./auth-actions');
    const result = await fetchSessionState();

    expect(result).toEqual({ status: 'unauthenticated' });
    expect(fetchMock).not.toHaveBeenCalled();
  });

  it('Test 2: 200 mit Benutzer -> authenticated, Cookie bleibt, Cookie-Header gesetzt', async () => {
    cookieGet.mockReturnValue({ value: 'session-abc' });
    const fetchMock = vi.fn(() =>
      Promise.resolve({
        ok: true,
        status: 200,
        text: () => Promise.resolve('{"id":"u1","username":"schalli"}'),
      }),
    );
    vi.stubGlobal('fetch', fetchMock);

    const { fetchSessionState } = await import('./auth-actions');
    const result = await fetchSessionState();

    expect(result.status).toBe('authenticated');
    if (result.status === 'authenticated') {
      expect(result.user.username).toBe('schalli');
    }
    expect(cookieDelete).not.toHaveBeenCalled();
    const [, options] = fetchMock.mock.calls[0] as unknown as [
      string,
      RequestInit,
    ];
    expect((options.headers as Record<string, string>).Cookie).toBe(
      'session=session-abc',
    );
  });

  it('Test 3: Status 401 -> unauthenticated, Cookie genau einmal geloescht', async () => {
    cookieGet.mockReturnValue({ value: 'session-abc' });
    vi.stubGlobal(
      'fetch',
      vi.fn(() => Promise.resolve({ ok: false, status: 401, text: () => Promise.resolve('') })),
    );

    const { fetchSessionState } = await import('./auth-actions');
    const result = await fetchSessionState();

    expect(result).toEqual({ status: 'unauthenticated' });
    expect(cookieDelete).toHaveBeenCalledTimes(1);
    expect(cookieDelete).toHaveBeenCalledWith('session');
  });

  it('Test 4: Status 403 -> unauthenticated, Cookie geloescht', async () => {
    cookieGet.mockReturnValue({ value: 'session-abc' });
    vi.stubGlobal(
      'fetch',
      vi.fn(() => Promise.resolve({ ok: false, status: 403, text: () => Promise.resolve('') })),
    );

    const { fetchSessionState } = await import('./auth-actions');
    const result = await fetchSessionState();

    expect(result).toEqual({ status: 'unauthenticated' });
    expect(cookieDelete).toHaveBeenCalledTimes(1);
  });

  it('Test 5: Status 200 mit leerem Body (oder "null") -> unauthenticated, Cookie geloescht', async () => {
    cookieGet.mockReturnValue({ value: 'session-abc' });
    vi.stubGlobal(
      'fetch',
      vi.fn(() => Promise.resolve({ ok: true, status: 200, text: () => Promise.resolve('') })),
    );

    const { fetchSessionState } = await import('./auth-actions');
    const result1 = await fetchSessionState();
    expect(result1).toEqual({ status: 'unauthenticated' });
    expect(cookieDelete).toHaveBeenCalledTimes(1);

    vi.clearAllMocks();
    cookieGet.mockReturnValue({ value: 'session-abc' });
    vi.stubGlobal(
      'fetch',
      vi.fn(() => Promise.resolve({ ok: true, status: 200, text: () => Promise.resolve('null') })),
    );
    const result2 = await fetchSessionState();
    expect(result2).toEqual({ status: 'unauthenticated' });
    expect(cookieDelete).toHaveBeenCalledTimes(1);
  });

  it('Test 6: Status 500 -> unavailable, Cookie bleibt', async () => {
    cookieGet.mockReturnValue({ value: 'session-abc' });
    vi.stubGlobal(
      'fetch',
      vi.fn(() => Promise.resolve({ ok: false, status: 500, text: () => Promise.resolve('') })),
    );

    const { fetchSessionState } = await import('./auth-actions');
    const result = await fetchSessionState();

    expect(result).toEqual({ status: 'unavailable' });
    expect(cookieDelete).not.toHaveBeenCalled();
  });

  it('Test 7: fetch wirft (Netzwerkfehler) -> unavailable, Cookie bleibt', async () => {
    cookieGet.mockReturnValue({ value: 'session-abc' });
    vi.stubGlobal(
      'fetch',
      vi.fn(() => Promise.reject(new TypeError('fetch failed'))),
    );

    const { fetchSessionState } = await import('./auth-actions');
    const result = await fetchSessionState();

    expect(result).toEqual({ status: 'unavailable' });
    expect(cookieDelete).not.toHaveBeenCalled();
  });

  it('Test 8: Status 200 mit nicht-JSON-Body -> unavailable, Cookie bleibt', async () => {
    cookieGet.mockReturnValue({ value: 'session-abc' });
    vi.stubGlobal(
      'fetch',
      vi.fn(() => Promise.resolve({ ok: true, status: 200, text: () => Promise.resolve('<html>') })),
    );

    const { fetchSessionState } = await import('./auth-actions');
    const result = await fetchSessionState();

    expect(result).toEqual({ status: 'unavailable' });
    expect(cookieDelete).not.toHaveBeenCalled();
  });
});