/**
 * core.js 单元测试
 * 覆盖 MarkdownEditor 类的构造、API、命令、历史栈、模式、事件、销毁
 */

import { MarkdownEditor } from '../src/core.js';

// jsdom 不提供 PointerEvent，用 MouseEvent 作为基类 polyfill
if (typeof window !== 'undefined' && typeof window.PointerEvent === 'undefined') {
  window.PointerEvent = class PointerEvent extends MouseEvent {
    constructor(type, init = {}) {
      super(type, init);
      this.pointerId = init.pointerId || 0;
      this.pointerType = init.pointerType || 'mouse';
      this.isPrimary = init.isPrimary !== false;
    }
  };
}

describe('MarkdownEditor - 构造', () => {
  let container;

  beforeEach(() => {
    document.body.innerHTML = '';
    container = document.createElement('div');
    container.id = 'host';
    document.body.appendChild(container);
  });

  test('通过元素构造', () => {
    const ed = new MarkdownEditor(container, { value: '# hi' });
    expect(ed.el).toBeInstanceOf(HTMLElement);
    expect(ed.container).toBe(container);
    expect(ed.getValue()).toBe('# hi');
  });

  test('通过选择器构造', () => {
    const ed = new MarkdownEditor('#host', { value: 'text' });
    expect(ed.el).toBeDefined();
    expect(ed.getValue()).toBe('text');
  });

  test('容器不存在时标记为已销毁且不抛错', () => {
    const ed = new MarkdownEditor('#not-exist', {});
    expect(ed.isDestroyed()).toBe(true);
  });

  test('生成唯一 id', () => {
    const a = new MarkdownEditor(container, {});
    const b = new MarkdownEditor(document.createElement('div'), {});
    expect(a.id).toBeTruthy();
    expect(b.id).toBeTruthy();
    expect(a.id).not.toBe(b.id);
  });

  test('DOM 结构完整', () => {
    const ed = new MarkdownEditor(container, {});
    expect(ed.el.className).toContain('me-wrapper');
    expect(ed.toolbarEl).toBeDefined();
    expect(ed.bodyEl).toBeDefined();
    expect(ed.textarea).toBeInstanceOf(HTMLTextAreaElement);
    expect(ed.previewEl).toBeDefined();
  });

  test('工具栏默认渲染按钮', () => {
    const ed = new MarkdownEditor(container, {});
    const btns = ed.toolbarEl.querySelectorAll('.me-btn');
    expect(btns.length).toBeGreaterThan(10);
  });

  test('toolbar: false 隐藏工具栏按钮', () => {
    const ed = new MarkdownEditor(container, { toolbar: false });
    const btns = ed.toolbarEl.querySelectorAll('.me-btn');
    expect(btns.length).toBe(0);
  });

  test('初始 value 写入 textarea', () => {
    const ed = new MarkdownEditor(container, { value: '# Title' });
    expect(ed.textarea.value).toBe('# Title');
  });

  test('wordCount 关闭时不创建状态栏', () => {
    const ed = new MarkdownEditor(container, { wordCount: false });
    expect(ed.statusEl).toBeNull();
  });

  test('wordCount 开启时创建状态栏', () => {
    const ed = new MarkdownEditor(container, { wordCount: true });
    expect(ed.statusEl).not.toBeNull();
  });
});

describe('MarkdownEditor - 内容 API', () => {
  let ed;
  beforeEach(() => {
    document.body.innerHTML = '';
    ed = new MarkdownEditor(document.createElement('div'), { value: '' });
  });
  afterEach(() => ed.destroy());

  test('getValue / setValue', () => {
    ed.setValue('# hello');
    expect(ed.getValue()).toBe('# hello');
    expect(ed.textarea.value).toBe('# hello');
  });

  test('setValue silent 不触发 change', () => {
    let called = 0;
    ed.on('change', () => called++);
    ed.setValue('x', { silent: true });
    expect(called).toBe(0);
  });

  test('setValue 默认触发 change', () => {
    let called = 0;
    ed.on('change', () => called++);
    ed.setValue('x');
    expect(called).toBeGreaterThan(0);
  });

  test('getHTML 返回渲染后 HTML', () => {
    ed.setValue('# Title');
    const html = ed.getHTML();
    expect(html).toContain('<h1');
    expect(html).toContain('Title');
  });

  test('insert 在光标处插入', () => {
    ed.setValue('abc');
    ed.textarea.selectionStart = ed.textarea.selectionEnd = 1;
    ed.insert('X');
    expect(ed.getValue()).toBe('aXbc');
  });

  test('wrap 包裹选区', () => {
    ed.setValue('hello');
    ed.textarea.selectionStart = 0;
    ed.textarea.selectionEnd = 5;
    ed.wrap('**', '**');
    expect(ed.getValue()).toBe('**hello**');
  });

  test('focus / blur 不抛错', () => {
    expect(() => ed.focus()).not.toThrow();
    expect(() => ed.blur()).not.toThrow();
  });

  test('enable / disable', () => {
    ed.disable();
    expect(ed.isDisabled()).toBe(true);
    expect(ed.el.className).toContain('me-disabled');
    ed.enable();
    expect(ed.isDisabled()).toBe(false);
  });
});

describe('MarkdownEditor - exec 命令', () => {
  let ed;
  beforeEach(() => {
    document.body.innerHTML = '';
    ed = new MarkdownEditor(document.createElement('div'), { value: 'hello world' });
  });
  afterEach(() => ed.destroy());

  function select(start, end) {
    ed.textarea.selectionStart = start;
    ed.textarea.selectionEnd = end === undefined ? start : end;
  }

  test('bold 包裹选区', () => {
    select(0, 5);
    ed.exec('bold');
    expect(ed.getValue()).toBe('**hello** world');
  });

  test('italic 包裹选区', () => {
    select(0, 5);
    ed.exec('italic');
    expect(ed.getValue()).toBe('*hello* world');
  });

  test('strikethrough 包裹选区', () => {
    select(0, 5);
    ed.exec('strikethrough');
    expect(ed.getValue()).toBe('~~hello~~ world');
  });

  test('code 包裹选区', () => {
    select(0, 5);
    ed.exec('code');
    expect(ed.getValue()).toBe('`hello` world');
  });

  test('h1 切换行首前缀', () => {
    select(0, 0);
    ed.exec('h1');
    expect(ed.getValue()).toBe('# hello world');
  });

  test('quote 切换行首前缀', () => {
    select(0, 0);
    ed.exec('quote');
    expect(ed.getValue()).toBe('> hello world');
  });

  test('ul 切换行首前缀', () => {
    select(0, 0);
    ed.exec('ul');
    expect(ed.getValue()).toBe('- hello world');
  });

  test('ol 切换行首前缀', () => {
    select(0, 0);
    ed.exec('ol');
    expect(ed.getValue()).toBe('1. hello world');
  });

  test('重复执行同一前缀命令会取消前缀', () => {
    select(0, 0);
    ed.exec('h1');
    ed.exec('h1');
    expect(ed.getValue()).toBe('hello world');
  });

  test('hr 插入分隔线', () => {
    ed.setValue('a');
    ed.textarea.selectionStart = ed.textarea.selectionEnd = 1;
    ed.exec('hr');
    expect(ed.getValue()).toContain('---');
  });

  test('link 插入链接', () => {
    ed.setValue('text');
    select(0, 4);
    ed.exec('link');
    expect(ed.getValue()).toMatch(/\[text\]\(https?:\/\//);
  });

  test('image 插入图片', () => {
    ed.setValue('alt');
    select(0, 3);
    ed.exec('image');
    expect(ed.getValue()).toMatch(/!\[alt\]\(https?:\/\//);
  });

  test('table 插入表格', () => {
    ed.setValue('');
    ed.exec('table');
    const v = ed.getValue();
    expect(v).toContain('|');
    expect(v).toContain('---');
  });

  test('未知命令不抛错', () => {
    expect(() => ed.exec('nonexistent')).not.toThrow();
  });

  test('exec 返回 this 支持链式', () => {
    expect(ed.exec('bold')).toBe(ed);
  });
});

describe('MarkdownEditor - 历史栈', () => {
  let ed;
  beforeEach(() => {
    document.body.innerHTML = '';
    ed = new MarkdownEditor(document.createElement('div'), { value: '' });
  });
  afterEach(() => ed.destroy());

  test('初始可撤销为 false', () => {
    expect(ed.canUndo()).toBe(false);
  });

  test('setValue 后可撤销', () => {
    ed.setValue('a');
    expect(ed.canUndo()).toBe(true);
  });

  test('undo 回退', () => {
    ed.setValue('a');
    ed.setValue('b');
    ed.undo();
    expect(ed.getValue()).toBe('a');
  });

  test('redo 前进', () => {
    ed.setValue('a');
    ed.setValue('b');
    ed.undo();
    ed.redo();
    expect(ed.getValue()).toBe('b');
  });

  test('无历史时 undo/redo 无副作用', () => {
    expect(() => ed.undo()).not.toThrow();
    expect(() => ed.redo()).not.toThrow();
  });

  test('undo/redo 返回 this', () => {
    ed.setValue('a');
    expect(ed.undo()).toBe(ed);
    expect(ed.redo()).toBe(ed);
  });
});

describe('MarkdownEditor - 模式与全屏', () => {
  let ed;
  beforeEach(() => {
    document.body.innerHTML = '';
    ed = new MarkdownEditor(document.createElement('div'), { mode: 'split' });
  });
  afterEach(() => ed.destroy());

  test('初始模式', () => {
    expect(ed.getMode()).toBe('split');
  });

  test('setMode 切换', () => {
    ed.setMode('edit');
    expect(ed.getMode()).toBe('edit');
    expect(ed.bodyEl.className).toContain('me-mode-edit');
  });

  test('setMode 切换到 preview', () => {
    ed.setMode('preview');
    expect(ed.getMode()).toBe('preview');
    expect(ed.bodyEl.className).toContain('me-mode-preview');
  });

  test('非法模式被忽略', () => {
    ed.setMode('invalid');
    expect(ed.getMode()).toBe('split');
  });

  test('toggleFullscreen 切换全屏状态', () => {
    expect(ed.isFullscreen()).toBe(false);
    ed.toggleFullscreen();
    expect(ed.isFullscreen()).toBe(true);
    expect(ed.el.className).toContain('me-fullscreen');
    ed.toggleFullscreen();
    expect(ed.isFullscreen()).toBe(false);
  });

  test('exitFullscreen', () => {
    ed.toggleFullscreen();
    ed.exitFullscreen();
    expect(ed.isFullscreen()).toBe(false);
  });

  test('setMode 触发 modeChange 事件', () => {
    let mode = null;
    ed.on('modeChange', (m) => { mode = m; });
    ed.setMode('edit');
    expect(mode).toBe('edit');
  });
});

describe('MarkdownEditor - 统计与状态', () => {
  let ed;
  beforeEach(() => {
    document.body.innerHTML = '';
    ed = new MarkdownEditor(document.createElement('div'), { value: '' });
  });
  afterEach(() => ed.destroy());

  test('getStats 返回统计字段', () => {
    ed.setValue('hello 世界');
    const stats = ed.getStats();
    expect(stats).toHaveProperty('characters');
    expect(stats).toHaveProperty('words');
    expect(stats).toHaveProperty('chineseChars');
    expect(stats).toHaveProperty('englishWords');
    expect(stats).toHaveProperty('lines');
    expect(stats).toHaveProperty('readingTime');
    expect(stats.chineseChars).toBe(2);
  });

  test('getStatus 返回状态字段', () => {
    const status = ed.getStatus();
    expect(status).toHaveProperty('id');
    expect(status).toHaveProperty('mode');
    expect(status).toHaveProperty('theme');
    expect(status).toHaveProperty('locale');
    expect(status).toHaveProperty('fullscreen');
    expect(status).toHaveProperty('destroyed');
    expect(status.destroyed).toBe(false);
  });
});

describe('MarkdownEditor - 事件', () => {
  let ed;
  beforeEach(() => {
    document.body.innerHTML = '';
    ed = new MarkdownEditor(document.createElement('div'), { value: '' });
  });
  afterEach(() => ed.destroy());

  test('on 返回取消函数', () => {
    const off = ed.on('change', () => {});
    expect(typeof off).toBe('function');
  });

  test('off 取消监听', () => {
    let called = 0;
    const fn = () => called++;
    ed.on('change', fn);
    ed.setValue('a');
    const before = called;
    ed.off('change', fn);
    ed.setValue('b');
    expect(called).toBe(before);
  });

  test('静态 on/off 钩子', () => {
    let triggered = 0;
    const fn = () => { triggered++; };
    MarkdownEditor.on('afterCreate', fn);
    const e = new MarkdownEditor(document.createElement('div'), {});
    expect(triggered).toBeGreaterThan(0);
    MarkdownEditor.off('afterCreate', fn);
    e.destroy();
  });
});

describe('MarkdownEditor - 插件', () => {
  let ed;
  beforeEach(() => {
    document.body.innerHTML = '';
    ed = new MarkdownEditor(document.createElement('div'), {});
  });
  afterEach(() => ed.destroy());

  test('use 安装对象插件', () => {
    let installed = false;
    ed.use({ name: 'test', install: () => { installed = true; } });
    expect(installed).toBe(true);
    expect(ed.getPlugins().length).toBe(1);
  });

  test('use 安装未知预设插件时 warn 且不崩溃', () => {
    const spy = jest.spyOn(console, 'warn').mockImplementation(() => {});
    ed.use('not-a-preset');
    expect(spy).toHaveBeenCalled();
    spy.mockRestore();
  });

  test('addToolbarButton 追加按钮', () => {
    ed.addToolbarButton({ action: 'custom', title: 'Custom' });
    const btn = ed.toolbarEl.querySelector('.me-btn-custom-custom');
    expect(btn).not.toBeNull();
  });

  test('销毁时调用插件 destroy', () => {
    let destroyed = false;
    const ed2 = new MarkdownEditor(document.createElement('div'), {});
    ed2.use({ name: 't', install() {}, destroy() { destroyed = true; } });
    ed2.destroy();
    expect(destroyed).toBe(true);
  });
});

describe('MarkdownEditor - 销毁', () => {
  test('destroy 移除 DOM 并标记', () => {
    document.body.innerHTML = '';
    const ed = new MarkdownEditor(document.createElement('div'), {});
    const el = ed.el;
    ed.destroy();
    expect(ed.isDestroyed()).toBe(true);
    // el 已置空
    expect(ed.el).toBeNull();
  });

  test('重复 destroy 不抛错', () => {
    document.body.innerHTML = '';
    const ed = new MarkdownEditor(document.createElement('div'), {});
    ed.destroy();
    expect(() => ed.destroy()).not.toThrow();
  });

  test('destroy 触发 destroy 事件', () => {
    document.body.innerHTML = '';
    const ed = new MarkdownEditor(document.createElement('div'), {});
    let fired = false;
    ed.on('destroy', () => { fired = true; });
    ed.destroy();
    expect(fired).toBe(true);
  });
});

// ============ 补充分支测试 ============

describe('MarkdownEditor - 构造边界', () => {
  test('非浏览器环境直接返回（_destroyed=true）', () => {
    // jsdom 是浏览器环境，此分支需通过模拟无法直接覆盖
    // 这里只验证 isBrowser() 返回 true 时正常路径
    const ed = new MarkdownEditor(document.createElement('div'), {});
    expect(ed.isDestroyed()).toBe(false);
    ed.destroy();
  });

  test('options.style 对象会被克隆', () => {
    const style = { color: 'red' };
    const ed = new MarkdownEditor(document.createElement('div'), { style });
    expect(ed.config.style).not.toBe(style);
    expect(ed.config.style.color).toBe('red');
    ed.destroy();
  });

  test('非法 mode 回退到 split', () => {
    const ed = new MarkdownEditor(document.createElement('div'), { mode: 'invalid-mode' });
    expect(ed.getMode()).toBe('split');
    ed.destroy();
  });

  test('config.plugins 数组会被安装', () => {
    const plugin = {
      name: 'test-plugin',
      install: jest.fn(),
      destroy: jest.fn(),
    };
    const ed = new MarkdownEditor(document.createElement('div'), { plugins: [plugin] });
    expect(plugin.install).toHaveBeenCalledWith(ed);
    ed.destroy();
    expect(plugin.destroy).toHaveBeenCalledWith(ed);
  });

  test('autofocus 自动聚焦', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { autofocus: true });
    // jsdom 中聚焦需要元素挂载到 document
    expect(ed.textarea).toBeDefined();
    ed.destroy();
  });

  test('onCreate 回调被调用', () => {
    const onCreate = jest.fn();
    const ed = new MarkdownEditor(document.createElement('div'), { onCreate });
    expect(onCreate).toHaveBeenCalledWith(ed);
    ed.destroy();
  });

  test('onCreate 抛错被捕获', () => {
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const ed = new MarkdownEditor(document.createElement('div'), {
      onCreate: () => { throw new Error('boom'); },
    });
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('自定义 render 函数覆盖内置解析器', () => {
    const customRender = jest.fn(() => '<p>custom</p>');
    const ed = new MarkdownEditor(document.createElement('div'), {
      value: '# test',
      render: customRender,
    });
    expect(customRender).toHaveBeenCalled();
    expect(ed.getHTML()).toBe('<p>custom</p>');
    ed.destroy();
  });

  test('自定义 highlight 函数被调用', () => {
    const highlight = jest.fn(() => '<span class="hl">code</span>');
    const ed = new MarkdownEditor(document.createElement('div'), {
      value: '```js\nvar x = 1\n```',
      highlight,
    });
    expect(highlight).toHaveBeenCalledWith('var x = 1', 'js');
    ed.destroy();
  });

  test('自定义 sanitize 净化 HTML', () => {
    const ed = new MarkdownEditor(document.createElement('div'), {
      value: 'hello',
      sanitize: (html) => '<div>sanitized</div>',
    });
    expect(ed.getHTML()).toBe('<div>sanitized</div>');
    ed.destroy();
  });
});

describe('MarkdownEditor - 键盘快捷键', () => {
  let ed;
  beforeEach(() => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    ed = new MarkdownEditor(c, { value: 'hello world' });
  });
  afterEach(() => ed.destroy());

  function key(key, opts = {}) {
    const ev = new KeyboardEvent('keydown', {
      key,
      ctrlKey: !!opts.ctrl,
      shiftKey: !!opts.shift,
      bubbles: true,
      cancelable: true,
    });
    ed.textarea.dispatchEvent(ev);
    return ev;
  }

  test('Tab 插入缩进（无选区，默认 tabSize=2）', () => {
    ed.setValue('hello world');
    // 光标放在位置 5（即 'hello' 之后、原空格之前）
    ed.textarea.setSelectionRange(5, 5);
    key('Tab');
    // 插入 2 空格：'hello' + '  ' + ' world' = 'hello   world'（含原空格共 3 空格）
    expect(ed.getValue()).toBe('hello   world');
  });

  test('Tab 在行尾插入缩进', () => {
    ed.setValue('hello');
    ed.textarea.setSelectionRange(5, 5);
    key('Tab');
    expect(ed.getValue()).toBe('hello  ');
  });

  test('Shift+Tab 反缩进（有选区）', () => {
    ed.setValue('  line1\n  line2');
    ed.textarea.setSelectionRange(0, 14);
    key('Tab', { shift: true });
    // 反缩进会移除每行行首的空格
    expect(ed.getValue()).toBe('line1\nline2');
  });

  test('Tab 有选区时整块缩进', () => {
    ed.setValue('line1\nline2');
    ed.textarea.setSelectionRange(0, 11);
    key('Tab');
    expect(ed.getValue()).toBe('  line1\n  line2');
  });

  test('Ctrl+B 触发 bold', () => {
    ed.textarea.setSelectionRange(0, 5);
    key('b', { ctrl: true });
    expect(ed.getValue()).toBe('**hello** world');
  });

  test('Ctrl+I 触发 italic', () => {
    ed.textarea.setSelectionRange(0, 5);
    key('i', { ctrl: true });
    expect(ed.getValue()).toBe('*hello* world');
  });

  test('Ctrl+E 触发 code', () => {
    ed.textarea.setSelectionRange(0, 5);
    key('e', { ctrl: true });
    expect(ed.getValue()).toBe('`hello` world');
  });

  test('Ctrl+K 触发 link', () => {
    ed.textarea.setSelectionRange(0, 5);
    key('k', { ctrl: true });
    // link 使用 prompt，jsdom 返回 null，但不应抛错
    expect(ed.getValue()).toBeDefined();
  });

  test('Ctrl+U 触发 underline', () => {
    ed.textarea.setSelectionRange(0, 5);
    key('u', { ctrl: true });
    expect(ed.getValue()).toBe('<u>hello</u> world');
  });

  test('Ctrl+1 触发 h1', () => {
    ed.textarea.setSelectionRange(0, 0);
    key('1', { ctrl: true });
    expect(ed.getValue()).toBe('# hello world');
  });

  test('Ctrl+2 触发 h2', () => {
    ed.textarea.setSelectionRange(0, 0);
    key('2', { ctrl: true });
    expect(ed.getValue()).toBe('## hello world');
  });

  test('Ctrl+3 触发 h3', () => {
    ed.textarea.setSelectionRange(0, 0);
    key('3', { ctrl: true });
    expect(ed.getValue()).toBe('### hello world');
  });

  test('Ctrl+Q 触发 quote', () => {
    ed.textarea.setSelectionRange(0, 0);
    key('q', { ctrl: true });
    expect(ed.getValue()).toBe('> hello world');
  });

  test('Ctrl+Z 撤销', () => {
    const initial = ed.getValue();
    ed.exec('bold');
    key('z', { ctrl: true });
    expect(ed.getValue()).toBe(initial);
  });

  test('Ctrl+Shift+Z 重做', () => {
    const initial = ed.getValue();
    ed.exec('bold');
    key('z', { ctrl: true });       // undo
    key('z', { ctrl: true, shift: true }); // redo
    expect(ed.getValue()).not.toBe(initial);
  });

  test('Ctrl+Y 重做', () => {
    const initial = ed.getValue();
    ed.exec('bold');
    key('z', { ctrl: true });       // undo
    key('y', { ctrl: true });       // redo
    expect(ed.getValue()).not.toBe(initial);
  });

  test('Ctrl+S 触发 save 事件', () => {
    const handler = jest.fn();
    ed.on('save', handler);
    key('s', { ctrl: true });
    expect(handler).toHaveBeenCalled();
  });

  test('Ctrl+S 调用 onSave 回调', () => {
    const onSave = jest.fn();
    ed.config.onSave = onSave;
    key('s', { ctrl: true });
    expect(onSave).toHaveBeenCalled();
  });

  test('无修饰键的按键不触发快捷键', () => {
    const initial = ed.getValue();
    key('b');
    expect(ed.getValue()).toBe(initial);
  });
});

describe('MarkdownEditor - 同步滚动', () => {
  test('分屏模式下 textarea 滚动联动 preview', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const longText = Array.from({ length: 100 }, (_, i) => `line ${i}`).join('\n');
    const ed = new MarkdownEditor(c, { value: longText, mode: 'split', syncScroll: true });
    ed.textarea.scrollTop = 100;
    ed.textarea.dispatchEvent(new Event('scroll'));
    // preview 应被同步滚动（scrollTop > 0 或为 0，取决于尺寸）
    expect(typeof ed.previewPane.scrollTop).toBe('number');
    ed.destroy();
  });

  test('syncScroll 关闭时不联动', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      value: 'line1\nline2\nline3',
      syncScroll: false,
    });
    const before = ed.previewPane.scrollTop;
    ed.textarea.scrollTop = 50;
    ed.textarea.dispatchEvent(new Event('scroll'));
    expect(ed.previewPane.scrollTop).toBe(before);
    ed.destroy();
  });

  test('非 split 模式不联动', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: 'test', mode: 'edit' });
    const before = ed.previewPane ? ed.previewPane.scrollTop : 0;
    ed.textarea.scrollTop = 50;
    ed.textarea.dispatchEvent(new Event('scroll'));
    ed.destroy();
  });
});

describe('MarkdownEditor - 分隔条拖拽', () => {
  test('pointerdown 触发拖拽（split 模式）', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: 'test', mode: 'split' });
    // jsdom 中 getBoundingClientRect 返回全 0，但不应抛错
    expect(() => {
      ed.dividerEl.dispatchEvent(new PointerEvent('pointerdown', { clientX: 200, bubbles: true }));
      window.dispatchEvent(new PointerEvent('pointermove', { clientX: 250 }));
      window.dispatchEvent(new PointerEvent('pointerup'));
    }).not.toThrow();
    expect(ed.isDestroyed()).toBe(false);
    ed.destroy();
  });

  test('非 split 模式不触发拖拽', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: 'test', mode: 'edit' });
    expect(() => {
      ed.dividerEl.dispatchEvent(new PointerEvent('pointerdown', { clientX: 200, bubbles: true }));
    }).not.toThrow();
    ed.destroy();
  });
});

describe('MarkdownEditor - 回调异常隔离', () => {
  test('onChange 抛错不影响后续 input', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      value: 'init',
      onChange: () => { throw new Error('boom'); },
    });
    expect(() => {
      ed.textarea.value = 'new';
      ed.textarea.dispatchEvent(new Event('input', { bubbles: true }));
    }).not.toThrow();
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('onInput 抛错被捕获', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      value: 'init',
      onInput: () => { throw new Error('boom'); },
    });
    ed.textarea.value = 'new';
    ed.textarea.dispatchEvent(new Event('input', { bubbles: true }));
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('onFocus 抛错被捕获', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      onFocus: () => { throw new Error('boom'); },
    });
    ed.textarea.dispatchEvent(new Event('focus', { bubbles: true }));
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('onBlur 抛错被捕获', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      onBlur: () => { throw new Error('boom'); },
    });
    ed.textarea.dispatchEvent(new Event('blur', { bubbles: true }));
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('onModeChange 抛错被捕获', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      onModeChange: () => { throw new Error('boom'); },
    });
    ed.setMode('edit');
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('onFullscreen 抛错被捕获', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      onFullscreen: () => { throw new Error('boom'); },
    });
    ed.toggleFullscreen();
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('onDestroy 抛错被捕获', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      onDestroy: () => { throw new Error('boom'); },
    });
    ed.destroy();
    expect(spy).toHaveBeenCalled();
    spy.mockRestore();
  });
});

describe('MarkdownEditor - 插件边界', () => {
  test('use 字符串引用未知预设插件 warn', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'warn').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    ed.use('non-existent-preset');
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('use 无效插件对象 warn', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'warn').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    ed.use(null);
    ed.use(123);
    ed.use({ name: 'no-install' });
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('use install 抛错被捕获', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    const badPlugin = {
      name: 'bad',
      install: () => { throw new Error('install boom'); },
    };
    ed.use(badPlugin);
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('addToolbarButton 无 action 直接返回', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    const before = ed.toolbarEl.querySelectorAll('.me-btn').length;
    ed.addToolbarButton(null);
    ed.addToolbarButton({ title: 'no-action' });
    expect(ed.toolbarEl.querySelectorAll('.me-btn').length).toBe(before);
    ed.destroy();
  });

  test('addToolbarButton 使用 onClick 回调', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    const onClick = jest.fn();
    ed.addToolbarButton({
      action: 'custom',
      title: 'Custom',
      icon: '<svg></svg>',
      onClick,
    });
    const btn = ed.toolbarEl.querySelector('.me-btn-custom-custom');
    expect(btn).not.toBeNull();
    btn.click();
    expect(onClick).toHaveBeenCalledWith(ed);
    ed.destroy();
  });

  test('addToolbarButton 使用 text 文本', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    ed.addToolbarButton({
      action: 'txt',
      title: 'Text Button',
      text: 'T',
    });
    const btn = ed.toolbarEl.querySelector('.me-btn-custom-txt');
    expect(btn).not.toBeNull();
    expect(btn.innerHTML).toContain('>T<');
    ed.destroy();
  });
});

describe('MarkdownEditor - 工具栏点击', () => {
  test('点击空白区域不抛错', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    expect(() => {
      ed.toolbarEl.click();
    }).not.toThrow();
    ed.destroy();
  });

  test('点击 mode 按钮切换模式', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { mode: 'split' });
    const editBtn = ed.toolbarEl.querySelector('.me-btn[data-mode="edit"]');
    editBtn.click();
    expect(ed.getMode()).toBe('edit');
    ed.destroy();
  });

  test('点击 action 按钮执行命令', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: 'test' });
    const boldBtn = ed.toolbarEl.querySelector('.me-btn[data-action="bold"]');
    ed.textarea.setSelectionRange(0, 4);
    boldBtn.click();
    expect(ed.getValue()).toBe('**test**');
    ed.destroy();
  });
});

describe('MarkdownEditor - 历史栈合并', () => {
  test('连续输入触发防抖合并', (done) => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: '' });
    // 连续快速输入
    ed.textarea.value = 'a';
    ed.textarea.dispatchEvent(new Event('input', { bubbles: true }));
    ed.textarea.value = 'ab';
    ed.textarea.dispatchEvent(new Event('input', { bubbles: true }));
    ed.textarea.value = 'abc';
    ed.textarea.dispatchEvent(new Event('input', { bubbles: true }));
    // 等待防抖结束
    setTimeout(() => {
      const initialLen = ed._history.length;
      // 防抖合并后历史栈不应为 3
      expect(ed._history.length).toBeLessThanOrEqual(initialLen + 1);
      ed.destroy();
      done();
    }, 500);
  });

  test('历史栈超过上限自动裁剪', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: '', historyLimit: 3 });
    for (let i = 0; i < 10; i++) {
      ed.setValue('v' + i, { silent: false });
    }
    expect(ed._history.length).toBeLessThanOrEqual(3);
    ed.destroy();
  });
});

describe('MarkdownEditor - 零散分支补全', () => {
  test('className 配置项被应用到 wrapper', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { className: 'my-cls another' });
    expect(ed.el.className).toContain('my-cls');
    expect(ed.el.className).toContain('another');
    ed.destroy();
  });

  test('render 抛错时显示错误信息', () => {
    document.body.innerHTML = '';
    const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {
      value: '# test',
      render: () => { throw new Error('render boom'); },
    });
    const html = ed.previewEl.innerHTML;
    expect(html).toContain('渲染失败');
    expect(html).toContain('render boom');
    expect(spy).toHaveBeenCalled();
    ed.destroy();
    spy.mockRestore();
  });

  test('canRedo 返回正确值', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: '' });
    expect(ed.canRedo()).toBe(false);
    ed.setValue('a');
    ed.setValue('b');
    ed.undo();
    expect(ed.canRedo()).toBe(true);
    ed.redo();
    expect(ed.canRedo()).toBe(false);
    ed.destroy();
  });

  test('undo/redo 触发 onChange 回调', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const onChange = jest.fn();
    const ed = new MarkdownEditor(c, { value: '', onChange });
    onChange.mockClear();
    ed.setValue('a');
    ed.setValue('b');
    onChange.mockClear();
    ed.undo();
    expect(onChange).toHaveBeenCalled();
    onChange.mockClear();
    ed.redo();
    expect(onChange).toHaveBeenCalled();
    ed.destroy();
  });

  test('exec("indent")/exec("outdent") 等价于 Tab/Shift+Tab', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: 'hello' });
    ed.textarea.selectionStart = ed.textarea.selectionEnd = 0;
    ed.exec('indent');
    expect(ed.getValue()).toBe('  hello');
    ed.textarea.selectionStart = 0;
    ed.textarea.selectionEnd = 7;
    ed.exec('outdent');
    expect(ed.getValue()).toBe('hello');
    ed.destroy();
  });

  test('exec("undo")/exec("redo") 等价于 undo()/redo()', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: '' });
    ed.setValue('a');
    ed.setValue('b');
    ed.exec('undo');
    expect(ed.getValue()).toBe('a');
    ed.exec('redo');
    expect(ed.getValue()).toBe('b');
    ed.destroy();
  });

  test('exec("edit"/"split"/"preview") 切换模式', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { mode: 'split' });
    ed.exec('edit');
    expect(ed.getMode()).toBe('edit');
    ed.exec('split');
    expect(ed.getMode()).toBe('split');
    ed.exec('preview');
    expect(ed.getMode()).toBe('preview');
    ed.destroy();
  });

  test('exec("fullscreen") 切换全屏', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    expect(ed._fullscreen).toBe(false);
    ed.exec('fullscreen');
    expect(ed._fullscreen).toBe(true);
    ed.exec('fullscreen');
    expect(ed._fullscreen).toBe(false);
    ed.destroy();
  });

  test('_toggleLinePrefix 替换已存在的不同前缀', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, { value: '- hello' });
    ed.textarea.selectionStart = ed.textarea.selectionEnd = 0;
    ed.exec('h1');
    // 原本行首是 "- "，执行 h1 后应替换为 "# "
    expect(ed.getValue()).toBe('# hello');
    ed.destroy();
  });

  test('setValue 触发 onChange 回调', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const onChange = jest.fn();
    const ed = new MarkdownEditor(c, { value: '', onChange });
    onChange.mockClear();
    ed.setValue('new');
    expect(onChange).toHaveBeenCalledWith('new', ed);
    ed.destroy();
  });

  test('getStatus 包含 plugins 字段', () => {
    document.body.innerHTML = '';
    const c = document.createElement('div');
    document.body.appendChild(c);
    const ed = new MarkdownEditor(c, {});
    ed.use({ name: 'demo-plugin', install: () => {} });
    const s = ed.getStatus();
    expect(Array.isArray(s.plugins)).toBe(true);
    expect(s.plugins).toContain('demo-plugin');
    ed.destroy();
  });
});