// theme store 单测（B1）：持久化与 dataset 同步（FR-THEME-002 / UI_SPEC §6）
import { beforeEach, describe, expect, it } from 'vitest';
import { createPinia, setActivePinia } from 'pinia';
import { useThemeStore, applyTheme, currentTheme } from '../../../../ui/src/stores/theme.js';

describe('theme store', () => {
  beforeEach(() => {
    localStorage.clear();
    document.documentElement.dataset.theme = 'dark';
    setActivePinia(createPinia());
  });

  it('从 dataset 初始化状态（dataset 缺失时回退 dark）', () => {
    document.documentElement.dataset.theme = 'light';
    setActivePinia(createPinia());
    expect(useThemeStore().theme).toBe('light');

    delete document.documentElement.dataset.theme;
    setActivePinia(createPinia());
    expect(useThemeStore().theme).toBe('dark');
  });

  it('toggle：dark→light，同步 dataset 与 localStorage', () => {
    const store = useThemeStore();
    expect(store.theme).toBe('dark');
    store.toggle();
    expect(store.theme).toBe('light');
    expect(document.documentElement.dataset.theme).toBe('light');
    expect(localStorage.getItem('pa-theme')).toBe('light');
    store.toggle();
    expect(store.theme).toBe('dark');
    expect(document.documentElement.dataset.theme).toBe('dark');
    expect(localStorage.getItem('pa-theme')).toBe('dark');
  });

  it('applyTheme：写 dataset + localStorage', () => {
    applyTheme('light');
    expect(document.documentElement.dataset.theme).toBe('light');
    expect(localStorage.getItem('pa-theme')).toBe('light');
  });

  it('set：非法值归一为 dark', () => {
    const store = useThemeStore();
    store.set('neon');
    expect(store.theme).toBe('dark');
  });

  it('currentTheme：恒有值（未知 dataset 值归一 dark）', () => {
    document.documentElement.dataset.theme = 'hacker';
    expect(currentTheme()).toBe('dark');
    document.documentElement.dataset.theme = 'light';
    expect(currentTheme()).toBe('light');
  });
});