// @vitest-environment node
/**
 * 平台会话代次的语义。
 *
 * 渲染层只持有这一个派生计数，用来识别换号/登出后到达的迟到结果。它必须在
 * 「同一账号续期」和「同一身份重复采纳（StrictMode 双次 hydrate）」时保持不变——否则
 * 在途生成会被自己的续期判成旧账号请求；而换账号、换 origin、登出又必须立刻推进。
 */
import { beforeEach, expect, test, vi } from 'vitest';

const refreshClientAuthSession = vi.hoisted(() => vi.fn());

vi.mock('../src/services/clientAuth', () => ({
  refreshClientAuthSession,
  subscribeClientAuthState: () => () => {},
}));

import {
  beginPlatformSessionTransition,
  commitAuthenticatedPlatformSession,
  currentPlatformSessionGeneration,
  requestPlatformSessionRefresh,
  resetPlatformSessionForTests,
  subscribePlatformSessionGeneration,
} from '../src/services/platformSession';

const userA = {
  id: 'user-a',
  publicUserCode: 'tn-a',
  displayName: '账号 A',
  avatarUrl: null,
  phoneNumber: null,
  phoneNumberMasked: null,
  loginMethod: 'password',
  bindingStatus: 'active',
  wechatBound: false,
  wechatDisplayName: null,
  wechatAccount: null,
};
const userB = {
  ...userA,
  id: 'user-b',
  publicUserCode: 'tn-b',
  displayName: '账号 B',
};

beforeEach(() => {
  refreshClientAuthSession.mockReset();
  resetPlatformSessionForTests();
});

test('同一身份重复采纳不推进代次，换 origin 或换账号才推进', async () => {
  const observed: number[] = [];
  const unsubscribe = subscribePlatformSessionGeneration((generation) => {
    observed.push(generation);
  });

  const first = await commitAuthenticatedPlatformSession(
    userA,
    currentPlatformSessionGeneration(),
    'https://a.example.com',
  );
  expect(first).toBe(1);
  // StrictMode 双次 hydrate 或同一账号重新登录：代次必须原地不动。
  const again = await commitAuthenticatedPlatformSession(
    userA,
    currentPlatformSessionGeneration(),
    'https://a.example.com',
  );
  expect(again).toBe(first);

  const otherOrigin = await commitAuthenticatedPlatformSession(
    userA,
    currentPlatformSessionGeneration(),
    'https://b.example.com',
  );
  expect(otherOrigin).toBe(2);
  const otherUser = await commitAuthenticatedPlatformSession(
    userB,
    currentPlatformSessionGeneration(),
    'https://b.example.com',
  );
  expect(otherUser).toBe(3);
  expect(observed).toEqual([1, 2, 3]);
  unsubscribe();
});

test('期望代次已过期时不采纳身份', async () => {
  await commitAuthenticatedPlatformSession(
    userA,
    currentPlatformSessionGeneration(),
    'https://a.example.com',
  );

  await expect(
    commitAuthenticatedPlatformSession(userB, 0, 'https://a.example.com'),
  ).resolves.toBeNull();
  expect(currentPlatformSessionGeneration()).toBe(1);
});

test('登录切换与登出立刻推进代次', () => {
  const before = currentPlatformSessionGeneration();
  const next = beginPlatformSessionTransition();

  expect(next).toBe(before + 1);
  expect(currentPlatformSessionGeneration()).toBe(next);
});

test('同一账号续期不推进代次，并发续期只发一次请求', async () => {
  await commitAuthenticatedPlatformSession(
    userA,
    currentPlatformSessionGeneration(),
    'https://a.example.com',
  );
  const generationBefore = currentPlatformSessionGeneration();
  refreshClientAuthSession.mockResolvedValue({
    status: 'refreshed',
    user: userA,
  });

  const [first, second] = await Promise.all([
    requestPlatformSessionRefresh(),
    requestPlatformSessionRefresh(),
  ]);

  expect(refreshClientAuthSession).toHaveBeenCalledTimes(1);
  expect(first).toEqual({
    status: 'refreshed',
    user: userA,
    generation: generationBefore,
  });
  expect(second).toEqual(first);
  expect(currentPlatformSessionGeneration()).toBe(generationBefore);
});

test('续期发现未登录时采纳空身份并给出权威失败', async () => {
  await commitAuthenticatedPlatformSession(
    userA,
    currentPlatformSessionGeneration(),
    'https://a.example.com',
  );
  const generationBefore = currentPlatformSessionGeneration();
  refreshClientAuthSession.mockResolvedValue({ status: 'unauthenticated' });

  const result = await requestPlatformSessionRefresh();

  expect(result.status).toBe('failed');
  if (result.status === 'failed') {
    expect(result.authoritative).toBe(true);
    expect(String(result.error)).toContain('登录已失效');
  }
  expect(currentPlatformSessionGeneration()).toBe(generationBefore + 1);
});

test('续期期间换号时返回 stale，不覆盖新身份', async () => {
  await commitAuthenticatedPlatformSession(
    userA,
    currentPlatformSessionGeneration(),
    'https://a.example.com',
  );
  refreshClientAuthSession.mockImplementation(async () => {
    beginPlatformSessionTransition();
    return { status: 'refreshed', user: userA };
  });

  await expect(requestPlatformSessionRefresh()).resolves.toEqual({
    status: 'stale',
  });
});

test('网络类续期失败保持会话且不标记为权威失败', async () => {
  await commitAuthenticatedPlatformSession(
    userA,
    currentPlatformSessionGeneration(),
    'https://a.example.com',
  );
  const generationBefore = currentPlatformSessionGeneration();
  refreshClientAuthSession.mockRejectedValue(new Error('网络不可达'));

  const result = await requestPlatformSessionRefresh();

  expect(result.status).toBe('failed');
  if (result.status === 'failed') {
    expect(result.authoritative).toBe(false);
  }
  expect(currentPlatformSessionGeneration()).toBe(generationBefore);
});