import { mount, type VueWrapper } from '@vue/test-utils';
import { afterEach, beforeEach, describe, expect, it } from 'vitest';
import { nextTick } from 'vue';
import App from '../App.vue';
import { LOCALE_STORAGE_KEY, createViewerI18n } from '../i18n';
import { router } from '../router';

// i18n 切换机制（顶栏 chrome 层）：活动页级的「切换语言 → 重取内容」由
// activity.spec.ts 覆盖，此处聚焦首页 chrome（无需 api mock）。
// 逐挂载独立 i18n + 逐用例卸载（背景见 activity.spec.ts 头注）。
let i18n: ReturnType<typeof createViewerI18n>;
let wrapper: VueWrapper;

describe('viewer i18n', () => {
  beforeEach(async () => {
    localStorage.clear();
    i18n = createViewerI18n('zh-CN');
    await router.push('/');
    await router.isReady();
    wrapper = mount(App, { global: { plugins: [router, i18n] } });
  });

  afterEach(() => {
    wrapper.unmount();
  });

  it('switching locale re-renders messages and persists the choice', async () => {
    expect(wrapper.text()).toContain('打开相册链接即可观看');
    expect(document.title).toBe('现场相册');

    // UI-02 V01 紧凑语言控件：展开菜单 → 选择 English。
    await wrapper.find('.locale-trigger').trigger('click');
    await nextTick();
    const english = wrapper.findAll('.locale-option').find((btn) => btn.text() === 'English');
    expect(english).toBeDefined();
    await english!.trigger('click');
    await nextTick();
    expect(wrapper.text()).toContain('Open an album link to start viewing');
    expect(document.title).toBe('Live Gallery');
    expect(document.documentElement.getAttribute('lang')).toBe('en');
    expect(localStorage.getItem(LOCALE_STORAGE_KEY)).toBe('en');

    // 切回 zh-CN 同样生效（菜单内当前语言 English 为勾选态）。
    await wrapper.find('.locale-trigger').trigger('click');
    await nextTick();
    const options = wrapper.findAll('.locale-option');
    const englishNow = options.find((btn) => btn.text() === 'English');
    expect(englishNow!.attributes('aria-checked')).toBe('true');
    const chinese = options.find((btn) => btn.text() === '中文');
    expect(chinese!.attributes('aria-checked')).toBe('false');
    await chinese!.trigger('click');
    await nextTick();
    expect(wrapper.text()).toContain('打开相册链接即可观看');
    expect(localStorage.getItem(LOCALE_STORAGE_KEY)).toBe('zh-CN');
  });

  // UI-02 Task 6（V05 §5.4 分享链路闭环）：分享 URL 携带 ?lang=，接收端
  // 首载据此定语言——优先于本地持久化偏好；不合法值（fr/auto）自然回退。
  it('initial locale honors the ?lang= share parameter over the stored preference', () => {
    localStorage.setItem(LOCALE_STORAGE_KEY, 'zh-CN');

    window.history.pushState({}, '', '/a/token?lang=en');
    expect(createViewerI18n().global.locale.value).toBe('en');

    // 非法/不支持值：回落到持久化偏好。
    window.history.pushState({}, '', '/a/token?lang=auto');
    expect(createViewerI18n().global.locale.value).toBe('zh-CN');
    window.history.pushState({}, '', '/a/token?lang=fr');
    expect(createViewerI18n().global.locale.value).toBe('zh-CN');

    // 无参数：持久化偏好照旧生效。
    window.history.pushState({}, '', '/a/token');
    expect(createViewerI18n().global.locale.value).toBe('zh-CN');

    // 参数不写 localStorage——接收者未做选择，显式切换才持久化。
    expect(localStorage.getItem(LOCALE_STORAGE_KEY)).toBe('zh-CN');
  });
});