/**
 * 账号选择器的行为测试。
 *
 * 判据集中在三件会**静默出错**的事上：
 *   1. 只有一个账号时不该出现「全部邮箱」（它是噪声，会让人以为漏了谁）
 *   2. 从"全部邮箱"切到某个账号后**必须重取收件箱** —— 不重取就会继续显示
 *      聚合结果，看起来像切换没生效
 *   3. 没有账号时不该渲染这个控件（那时界面该由登录页负责）
 */

import { describe, expect, it, vi, beforeEach } from 'vitest';
import { render, screen, waitFor } from '@testing-library/react';
import userEvent from '@testing-library/user-event';

import AccountSwitcher from '../../src/components/AccountSwitcher';
import { useAccountStore } from '../../src/stores/accountStore';
import { useMailStore } from '../../src/stores/mailStore';
import { useUIStore } from '../../src/stores/uiStore';
import * as api from '../../src/api/client';

const acct = (id: string, name: string) => ({
  id,
  displayName: name,
  gateway: 'http://192.168.2.60:8180',
  token: `tok-${id}`,
  username: name
});

function seed(accounts: ReturnType<typeof acct>[], activeId: string) {
  useAccountStore.setState({ accounts, activeId, loaded: true } as never);
}

describe('AccountSwitcher', () => {
  beforeEach(() => {
    vi.restoreAllMocks();
    vi.spyOn(api, 'getInbox').mockResolvedValue({ mails: [], total: 0 } as never);
    useAccountStore.setState({ accounts: [], activeId: 'all', loaded: true } as never);
    useMailStore.setState({ inbox: [], accountErrors: [] });
    useUIStore.setState({ viewMode: 'inbox' });
  });

  it('没有账号时不渲染（那时该由登录页负责）', () => {
    const { container } = render(<AccountSwitcher />);
    expect(container.firstChild).toBeNull();
  });

  it('★ 只有一个账号时退化成静态标题：不出现「全部邮箱」', async () => {
    seed([acct('a1', '工作邮箱')], 'a1');
    render(<AccountSwitcher />);
    const btn = screen.getByTestId('account-switcher');
    expect(btn).toHaveTextContent('工作邮箱');

    await userEvent.click(btn);
    // 点不开：聚合没有意义（一个账号的"全部"就是它自己）
    expect(screen.queryByTestId('account-menu')).toBeNull();
    expect(screen.queryByTestId('account-option-all')).toBeNull();
  });

  it('两个账号时可以展开，菜单里有「全部邮箱」与各账号', async () => {
    seed([acct('a1', '工作邮箱'), acct('a2', '私人邮箱')], 'a1');
    render(<AccountSwitcher />);

    await userEvent.click(screen.getByTestId('account-switcher'));
    expect(screen.getByTestId('account-menu')).toBeInTheDocument();
    expect(screen.getByTestId('account-option-all')).toHaveTextContent('全部邮箱');
    expect(screen.getByTestId('account-option-a1')).toHaveTextContent('工作邮箱');
    expect(screen.getByTestId('account-option-a2')).toHaveTextContent('私人邮箱');
  });

  it('★ 切到某个账号后必须重取收件箱（否则会继续显示聚合结果）', async () => {
    seed([acct('a1', '工作邮箱'), acct('a2', '私人邮箱')], 'all');
    render(<AccountSwitcher />);

    await userEvent.click(screen.getByTestId('account-switcher'));
    await userEvent.click(screen.getByTestId('account-option-a2'));

    await waitFor(() => expect(useAccountStore.getState().activeId).toBe('a2'));
    expect(api.getInbox).toHaveBeenCalled();
  });

  it('★ 切到「全部邮箱」也要重取（聚合要并发问多个账号）', async () => {
    seed([acct('a1', '工作邮箱'), acct('a2', '私人邮箱')], 'a1');
    render(<AccountSwitcher />);

    await userEvent.click(screen.getByTestId('account-switcher'));
    await userEvent.click(screen.getByTestId('account-option-all'));

    await waitFor(() => expect(useAccountStore.getState().activeId).toBe('all'));
    // 两个可用账号 → 走聚合路径（getInboxWithAuth 每个账号一次）
    const withAuth = vi.spyOn(api, 'getInboxWithAuth').mockResolvedValue({ mails: [], total: 0 } as never);
    await useMailStore.getState().fetchInbox('all');
    expect(withAuth).toHaveBeenCalledTimes(2);
  });

  it('聚合模式下**只有一个可用账号**时不并发两个请求（第二条是多余失败面）', async () => {
    useAccountStore.setState({
      accounts: [{ ...acct('a1', '工作邮箱') }, { ...acct('a2', '坏账号'), token: '' }],
      activeId: 'all',
      loaded: true
    } as never);
    const withAuth = vi.spyOn(api, 'getInboxWithAuth').mockResolvedValue({ mails: [], total: 0 } as never);
    await useMailStore.getState().fetchInbox('all');
    expect(withAuth).not.toHaveBeenCalled();
    expect(api.getInbox).toHaveBeenCalled();
  });

  it('★ 某个账号取失败必须在 store 里说出来，而不是静默少一份', async () => {
    useAccountStore.setState({
      accounts: [acct('a1', '工作邮箱'), acct('a2', '私人邮箱')],
      activeId: 'all',
      loaded: true
    } as never);
    vi.spyOn(api, 'getInboxWithAuth')
      .mockResolvedValueOnce({ mails: [{ mail_id: 'm1' }], total: 1 } as never)
      .mockRejectedValueOnce(new Error('HTTP 401：密钥无效'));

    await useMailStore.getState().fetchInbox('all');

    expect(useMailStore.getState().inbox.map((m: any) => m.mail_id)).toEqual(['m1']);
    expect(useMailStore.getState().accountErrors).toEqual([
      { account: '私人邮箱', error: 'HTTP 401：密钥无效' }
    ]);
  });

  it('「管理账号…」跳到账号页', async () => {
    seed([acct('a1', '工作邮箱'), acct('a2', '私人邮箱')], 'a1');
    render(<AccountSwitcher />);
    await userEvent.click(screen.getByTestId('account-switcher'));
    await userEvent.click(screen.getByTestId('account-manage'));
    expect(useUIStore.getState().viewMode).toBe('account');
  });
});