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

import { ApiError, AuthSession, type AuthTokens, type AuthUser, type RefreshStore } from './auth';

const user = {
  id: '00000000-0000-0000-0000-000000000001',
  username: 'alice',
  display_name: null,
  role: 'user' as const,
  locale: 'ru',
  ui_prefs: {},
  must_change_password: false,
  must_change_credentials: false,
  reviews_uploads: false,
  created_at: '2026-01-01T00:00:00Z',
};

const tokens = (access: string, refresh?: string): AuthTokens => ({
  access_token: access,
  token_type: 'Bearer',
  expires_in: 900,
  refresh_token: refresh,
  user,
});

const json = (body: unknown, status = 200) =>
  new Response(JSON.stringify(body), {
    status,
    headers: { 'Content-Type': status >= 400 ? 'application/problem+json' : 'application/json' },
  });

const problem = (status: number, code: string, extra: object = {}) => json({ status, code, ...extra }, status);

type Handler = (req: Request) => Response | Promise<Response>;

/** Фейковый сервер: маршруты по «METHOD path», журнал запросов. */
function server(routes: Record<string, Handler>) {
  const log: { route: string; auth: string | null; body: string }[] = [];
  const fetchImpl = async (input: RequestInfo | URL) => {
    const req = input as Request;
    const route = `${req.method} ${new URL(req.url).pathname}`;
    log.push({ route, auth: req.headers.get('Authorization'), body: await req.clone().text() });
    const h = routes[route];
    if (!h) return problem(404, 'common.not_found');
    return h(req);
  };
  return { fetch: fetchImpl as typeof fetch, log };
}

const memoryStore = (initial: string | null = null): RefreshStore & { value: string | null } => ({
  value: initial,
  async get() {
    return this.value;
  },
  async set(v) {
    this.value = v;
  },
  async clear() {
    this.value = null;
  },
});

describe('AuthSession', () => {
  it('logs in and sends the bearer token', async () => {
    const s = server({
      'POST /api/v1/auth/login': () => json(tokens('A1')),
      'GET /api/v1/me': (req) =>
        req.headers.get('Authorization') === 'Bearer A1' ? json(user) : problem(401, 'auth.unauthorized'),
    });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'web', deviceName: 'Test' });
    const states: string[] = [];
    auth.subscribe((st) => states.push(st.status));

    await auth.login('alice', 'secret');
    expect(JSON.parse(s.log[0]!.body)).toEqual({
      username: 'alice',
      password: 'secret',
      client_type: 'web',
      device_name: 'Test',
    });
    const me = await auth.client.GET('/api/v1/me');
    expect(me.data?.username).toBe('alice');
    expect(states).toEqual(['signed_in']);
  });

  it('reports proxy HTML 413 as a request size error', async () => {
    const s = server({ 'POST /api/v1/auth/login': () => new Response('<html>Request Entity Too Large</html>', { status: 413 }) });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'web' });
    const error = await auth.login('alice', 'password').catch((e: unknown) => e);
    expect(error).toBeInstanceOf(ApiError);
    expect((error as ApiError).status).toBe(413);
    expect((error as ApiError).code).toBe('common.request_too_large');
  });

  it('turns problem+json into ApiError with field errors', async () => {
    const s = server({
      'POST /api/v1/auth/login': () => problem(401, 'auth.invalid_credentials'),
    });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'web' });
    const err = await auth.login('alice', 'bad').catch((e: unknown) => e);
    expect(err).toBeInstanceOf(ApiError);
    expect((err as ApiError).code).toBe('auth.invalid_credentials');
    expect(auth.state.status).toBe('unknown');

    const e2 = new ApiError(422, 'validation.password_too_short', { min: 8 }, [
      { field: 'new_password', code: 'validation.password_too_short' },
    ]);
    expect(e2.fieldCode('new_password')).toBe('validation.password_too_short');
    expect(e2.fieldCode('other')).toBeUndefined();
  });

  it('refreshes once for parallel expired requests and retries them', async () => {
    let refreshes = 0;
    const s = server({
      'POST /api/v1/auth/login': () => json(tokens('old')),
      'POST /api/v1/auth/refresh': async () => {
        refreshes++;
        await new Promise((r) => setTimeout(r, 10));
        return json(tokens('new'));
      },
      'GET /api/v1/me': (req) =>
        req.headers.get('Authorization') === 'Bearer new' ? json(user) : problem(401, 'auth.token_expired'),
    });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'web' });
    await auth.login('alice', 'secret');

    const results = await Promise.all([1, 2, 3].map(() => auth.client.GET('/api/v1/me')));
    expect(results.every((r) => r.data?.username === 'alice')).toBe(true);
    expect(refreshes).toBe(1);
  });

  it('does not refresh on other 401 codes and signs out a blocked user', async () => {
    const s = server({
      'POST /api/v1/auth/login': () => json(tokens('A')),
      'GET /api/v1/me': () => problem(401, 'auth.user_blocked'),
    });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'web' });
    await auth.login('alice', 'secret');
    const res = await auth.client.GET('/api/v1/me');
    expect(res.response.status).toBe(401);
    expect(s.log.some((l) => l.route.includes('refresh'))).toBe(false);
    expect(auth.state).toEqual({ status: 'signed_out', reason: 'auth.user_blocked' });
  });

  it('signs out when refresh is rejected', async () => {
    const s = server({
      'POST /api/v1/auth/refresh': () => problem(401, 'auth.refresh_reused'),
    });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'web' });
    expect(await auth.restore()).toEqual({ status: 'signed_out', reason: 'auth.refresh_reused' });
  });

  it('retries a refresh race once', async () => {
    let n = 0;
    const s = server({
      'POST /api/v1/auth/refresh': () => (++n === 1 ? problem(401, 'auth.refresh_race') : json(tokens('A'))),
    });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'web' });
    expect((await auth.restore()).status).toBe('signed_in');
    expect(n).toBe(2);
  });

  it('keeps the session on network errors during refresh', async () => {
    const auth = new AuthSession({
      baseUrl: 'http://x',
      fetch: async () => {
        throw new TypeError('Failed to fetch');
      },
      clientType: 'web',
    });
    expect(await auth.refresh()).toBe(false);
    expect(auth.state.status).toBe('unknown');
  });

  it('android keeps the refresh token in the store', async () => {
    const store = memoryStore('R0');
    const s = server({
      'POST /api/v1/auth/refresh': async (req) => {
        const body = (await req.json()) as { refresh_token: string };
        return body.refresh_token === 'R0' ? json(tokens('A1', 'R1')) : problem(401, 'auth.refresh_invalid');
      },
      'POST /api/v1/auth/logout': () => new Response(null, { status: 204 }),
    });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'android', refreshStore: store });
    expect((await auth.restore()).status).toBe('signed_in');
    expect(store.value).toBe('R1');

    await auth.logout();
    expect(store.value).toBeNull();
    expect(auth.state.status).toBe('signed_out');
    expect(s.log.at(-1)).toMatchObject({ route: 'POST /api/v1/auth/logout', auth: 'Bearer A1' });
    expect(await auth.refresh()).toBe(false);
  });

  it('opens offline with the cached user and refreshes on the first request', async () => {
    let online = false;
    const store = { ...memoryStore('R0'), cached: null as AuthUser | null };
    store.getUser = async () => store.cached;
    store.setUser = async (u) => {
      store.cached = u;
    };
    store.cached = user;
    const s = server({
      'POST /api/v1/auth/refresh': () => json(tokens('A1', 'R1')),
      'GET /api/v1/me': () => json(user),
    });
    const fetchImpl = (async (input: RequestInfo | URL) => {
      if (!online) throw new TypeError('Network request failed');
      return s.fetch(input);
    }) as typeof fetch;
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: fetchImpl, clientType: 'android', refreshStore: store });
    expect(await auth.restore()).toEqual({ status: 'signed_in', user, offline: true });

    online = true;
    await auth.client.GET('/api/v1/me');
    expect(s.log.map((l) => l.route)).toEqual(['POST /api/v1/auth/refresh', 'GET /api/v1/me']);
    expect(s.log[1]?.auth).toBe('Bearer A1');
    expect(auth.state).toEqual({ status: 'signed_in', user });
  });

  it('requires a refresh store for android', () => {
    expect(() => new AuthSession({ clientType: 'android' })).toThrow(/refreshStore/);
  });

  it('notifies subscribers about profile updates', async () => {
    const s = server({ 'POST /api/v1/auth/login': () => json(tokens('A')) });
    const auth = new AuthSession({ baseUrl: 'http://x', fetch: s.fetch, clientType: 'web' });
    const fn = vi.fn();
    auth.subscribe(fn);
    await auth.login('alice', 'x');
    auth.setUser({ ...user, display_name: 'Alice' });
    expect(fn).toHaveBeenLastCalledWith({ status: 'signed_in', user: { ...user, display_name: 'Alice' } });
  });
});