/**
 * 环境隔离测试 — 需要切换 document/window/localStorage 环境并调用 jest.resetModules()。
 * 独立成文件：resetModules 会清空模块缓存，若与其他测试同文件会导致
 * 后续 require 拿到新模块实例、与 import 时绑定的实例状态分裂。
 * 注：jsdom 以 getter 暴露 document/window，普通赋值无效，须用 defineProperty 覆盖。
 * @module tests
 * @version 0.5.0
 */

/** 临时移除全局对象，返回恢复函数 */
const hideGlobal = (key: string): (() => void) => {
  const desc = Object.getOwnPropertyDescriptor(global, key);
  Object.defineProperty(global, key, { value: undefined, configurable: true, writable: true });
  return () => {
    if (desc) Object.defineProperty(global, key, desc);
    else delete (global as Record<string, unknown>)[key];
  };
};

describe('环境隔离（SSR / localStorage 异常路径）', () => {
  test('escapeHTML SSR 路径（无 document）', () => {
    const restore = hideGlobal('document');
    jest.resetModules();
    const { escapeHTML } = require('../src/utils.js');
    const result = escapeHTML('<script>alert("xss")</script>');
    expect(result).not.toContain('<script>');
    expect(result).toContain('&lt;script&gt;');
    restore();
  });

  test('prefersDark 无 window 时返回 false', () => {
    const restore = hideGlobal('window');
    jest.resetModules();
    const { prefersDark } = require('../src/utils.js');
    expect(prefersDark()).toBe(false);
    restore();
  });

  test('saveTheme localStorage 异常被捕获', () => {
    const orig = (global as Record<string, unknown>).localStorage;
    (global as Record<string, unknown>).localStorage = undefined;
    jest.resetModules();
    const { saveTheme } = require('../src/themes.js');
    expect(() => saveTheme('dark')).not.toThrow();
    (global as Record<string, unknown>).localStorage = orig;
  });

  test('loadLocale localStorage 异常返回 default', () => {
    const orig = (global as Record<string, unknown>).localStorage;
    (global as Record<string, unknown>).localStorage = {
      getItem: () => { throw new Error('quota'); },
    };
    jest.resetModules();
    const { loadLocale } = require('../src/i18n.js');
    expect(typeof loadLocale()).toBe('string');
    (global as Record<string, unknown>).localStorage = orig;
  });
});