import { flushPromises, mount, type VueWrapper } from '@vue/test-utils';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { nextTick } from 'vue';
import App from '../App.vue';
import { ApiError, getPublicAlbum, type PublicAlbum } from '../api/client';
import { createViewerI18n, type ViewerI18n } from '../i18n';
import ActivityPage from '../pages/ActivityPage.vue';
import { router } from '../router';
import { makeAlbum, makeEnAlbum } from './fixtures';

// ActivityPage（Task 6）组件测试：api client 以真实模块为底、仅替身 getPublicAlbum /
// getPublicPhotos（Task 7 起活动页内嵌 PhotoFeed，需喂空页避免真实 fetch），
// 保证 ApiError/errors 映射等真实逻辑参与断言。
vi.mock('../api/client', async (importOriginal) => {
  const actual = await importOriginal<typeof import('../api/client')>();
  return {
    ...actual,
    getPublicAlbum: vi.fn(),
    getPublicPhotos: vi.fn().mockResolvedValue({ items: [], nextCursor: null, hasMore: false }),
  };
});

const mockedGetPublicAlbum = vi.mocked(getPublicAlbum);

// 逐挂载独立 i18n 实例 + 逐用例卸载：vue-i18n 在 app.unmount 时 dispose 共享实例
// （见 i18n/index.ts 注释），复用单例会让后续用例的 locale 写入失效；残留组件的
// locale watch 也会在后续用例切换语言时再度触发取数，污染调用序断言。
let i18n: ViewerI18n;
const mounted: VueWrapper[] = [];

function mountPage(): VueWrapper {
  const wrapper = mount(ActivityPage, { global: { plugins: [router, i18n] } });
  mounted.push(wrapper);
  return wrapper;
}

function mountApp(): VueWrapper {
  const wrapper = mount(App, { global: { plugins: [router, i18n] } });
  mounted.push(wrapper);
  return wrapper;
}

describe('activity page (Task 6)', () => {
  beforeEach(async () => {
    localStorage.clear();
    i18n = createViewerI18n('zh-CN');
    document.title = '';
    mockedGetPublicAlbum.mockReset().mockResolvedValue(makeAlbum());
    await router.push('/a/tok-activity');
    await router.isReady();
  });

  afterEach(() => {
    while (mounted.length > 0) {
      mounted.pop()?.unmount();
    }
  });

  it('renders album info in zh: title, pre-wrap description, venue · address, categories chips and empty notice', async () => {
    const wrapper = mountPage();
    await flushPromises();

    expect(mockedGetPublicAlbum).toHaveBeenCalledWith('tok-activity', 'zh-CN');
    expect(wrapper.find('h1.title').text()).toBe('2026 公司年会');
    expect(wrapper.find('.description').text()).toBe('年度盛会\n多行介绍');
    expect(wrapper.find('.meta').text()).toContain('大宴会厅 · 上海市浦东新区世纪大道 100 号');
    // Asia/Shanghai：UTC 10-01 02:00/12:00 → 本地 10-01 10:00/20:00。
    expect(wrapper.find('.meta').text()).toContain('10月1日');

    const chips = wrapper.findAll('.chip');
    expect(chips.map((chip) => chip.text())).toEqual(['全部', '签到墙', '开场']);
    expect(chips.every((chip) => chip.attributes('disabled') === undefined)).toBe(true);

    expect(wrapper.find('.empty-notice').text()).toBe('照片即将上线');
    // 无 banner 资产 → 不渲染 img；viewCount 占位 null → 不渲染任何计数节点。
    expect(wrapper.find('img.banner').exists()).toBe(false);
    expect(wrapper.find('.view-count').exists()).toBe(false);
    expect(document.title).toBe('2026 公司年会');
  });

  it('formats the time range in the album timezone (America/New_York shifts UTC date back one day)', async () => {
    mockedGetPublicAlbum.mockResolvedValue(
      makeAlbum({ timezone: 'America/New_York' }),
    );
    const wrapper = mountPage();
    await flushPromises();

    // UTC 10-01 02:00 → New York（EDT, UTC-4）09-30 22:00；endAt 12:00Z → 10-01 08:00。
    const time = wrapper.find('.meta').text();
    expect(time).toContain('9月30');
    expect(time).toContain('10月1');
    expect(time).not.toContain('9月29');
  });

  it('renders a single date when endAt is missing (no range separator)', async () => {
    mockedGetPublicAlbum.mockResolvedValue(
      makeAlbum({ timezone: 'America/New_York', endAt: null }),
    );
    const wrapper = mountPage();
    await flushPromises();

    const time = wrapper.find('.meta').text();
    expect(time).toContain('9月30');
    expect(time).not.toContain('–'); // 区间分隔符不应出现
    expect(time).not.toContain('10月1');
  });

  it('switching locale re-fetches with ?locale= and shows resolved English content', async () => {
    mockedGetPublicAlbum.mockImplementation((_token, locale) =>
      Promise.resolve(locale === 'en' ? makeEnAlbum() : makeAlbum()),
    );
    const wrapper = mountApp();
    await flushPromises();
    expect(mockedGetPublicAlbum).toHaveBeenLastCalledWith('tok-activity', 'zh-CN');
    expect(wrapper.find('h1.title').text()).toBe('2026 公司年会');

    await wrapper.find('button.locale-switcher').trigger('click');
    await flushPromises();

    expect(mockedGetPublicAlbum).toHaveBeenLastCalledWith('tok-activity', 'en');
    expect(wrapper.find('h1.title').text()).toBe('Annual Party 2026');
    expect(wrapper.find('.empty-notice').text()).toBe('Photos coming soon');
    expect(document.title).toBe('Annual Party 2026');
  });

  it('ALBUM_NOT_PUBLIC renders the localized message with retry; retry recovers', async () => {
    mockedGetPublicAlbum
      .mockRejectedValueOnce(new ApiError('ALBUM_NOT_PUBLIC', 'album not public', 404, 'req-1'))
      .mockResolvedValueOnce(makeAlbum());
    const wrapper = mountPage();
    await flushPromises();

    expect(wrapper.find('.error[role="alert"]').text()).toContain('相册不存在或已下线');
    expect(wrapper.find('h1.title').exists()).toBe(false);

    await wrapper.find('.error button').trigger('click');
    await flushPromises();
    expect(wrapper.find('h1.title').text()).toBe('2026 公司年会');
  });

  it('renders banner img with the signed url when present, nothing when absent', async () => {
    mockedGetPublicAlbum.mockResolvedValue(
      makeAlbum({ banner: { url: 'http://127.0.0.1:9000/photo-live/dev/albums/a1/assets/banner.jpg?sig=1', expiresAt: '2026-10-01T00:00:00.000Z' } }),
    );
    const withBanner = mountPage();
    await flushPromises();
    const img = withBanner.find('img.banner');
    expect(img.exists()).toBe(true);
    expect(img.attributes('src')).toContain('/albums/a1/assets/banner.jpg?sig=1');

    mockedGetPublicAlbum.mockResolvedValue(makeAlbum());
    const withoutBanner = mountPage();
    await flushPromises();
    expect(withoutBanner.find('img.banner').exists()).toBe(false);
  });

  it('hides the banner on img load failure (layout adapts, no broken image)', async () => {
    mockedGetPublicAlbum.mockResolvedValue(
      makeAlbum({ banner: { url: 'http://127.0.0.1:9000/photo-live/dev/expired.jpg?sig=stale', expiresAt: '2020-01-01T00:00:00.000Z' } }),
    );
    const wrapper = mountPage();
    await flushPromises();
    expect(wrapper.find('img.banner').exists()).toBe(true);

    await wrapper.find('img.banner').trigger('error');
    await nextTick();
    expect(wrapper.find('img.banner').exists()).toBe(false);
  });

  it('shows the localized loading state until the request settles', async () => {
    let resolve!: (value: PublicAlbum) => void;
    mockedGetPublicAlbum.mockReturnValue(
      new Promise<PublicAlbum>((res) => {
        resolve = res;
      }),
    );
    const wrapper = mountPage();
    await flushPromises();
    expect(wrapper.find('.status').text()).toBe('加载中…');
    expect(wrapper.find('h1.title').exists()).toBe(false);

    resolve(makeAlbum());
    await flushPromises();
    expect(wrapper.find('.status').exists()).toBe(false);
    expect(wrapper.find('h1.title').text()).toBe('2026 公司年会');
  });

  it('discards stale responses when the locale changes quickly (last request wins)', async () => {
    const pending: Array<(value: PublicAlbum | PromiseLike<PublicAlbum>) => void> = [];
    mockedGetPublicAlbum.mockImplementation(
      () =>
        new Promise<PublicAlbum>((res) => {
          pending.push(res);
        }),
    );
    const wrapper = mountPage();
    await flushPromises();

    // zh 请求在途时切到 en（触发第二个请求），en 先返回、zh 后返回——zh 为过期响应。
    i18n.global.locale.value = 'en';
    await flushPromises();
    expect(pending).toHaveLength(2);

    pending[1](makeEnAlbum());
    await flushPromises();
    expect(wrapper.find('h1.title').text()).toBe('Annual Party 2026');

    pending[0](makeAlbum());
    await flushPromises();
    expect(wrapper.find('h1.title').text()).toBe('Annual Party 2026');
  });
});