/**
 * 41-typora — Typora Markdown 编辑器 深层测试
 *
 * 使用 vitest 原汁原味的 vi.mock() + vi.useFakeTimers() 模式。
 * 统一在 afterEach 中恢复 fake timers（setup.ts 全局已处理，此处兜底）。
 */
import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest'
import { mount } from '@vue/test-utils'
import { nextTick } from 'vue'
import TyporaComponent from '../../src/apps/typora/Typora.vue'
import { setupDOM } from '../helpers'

vi.mock('../../src/composables/useFS', () => ({
  fs: {
    HOME: '/Users/guest',
    exists: vi.fn(() => true),
    read: vi.fn(() => '# Typora 欢迎页\n\n这是 **Markdown** 实时预览编辑器。\n\n- 支持标题\n- 支持列表\n- 支持 **粗体** 和 *斜体*'),
    write: vi.fn(),
    baseName: (p: string) => p.split('/').pop() || '',
  },
}))

vi.mock('../../src/composables/useWM', () => ({
  wm: { setTitle: vi.fn() },
}))

describe('41-typora — Typora', () => {
  let el: HTMLElement, body: HTMLElement

  beforeEach(() => {
    vi.clearAllMocks()
    setupDOM()
    el = document.createElement('div')
    el.className = 'window'
    document.body.appendChild(el)
    body = document.createElement('div')
    body.className = 'win-body'
    el.appendChild(body)
  })

  afterEach(() => {
    el.remove()
    vi.useRealTimers()
  })

  function mountComponent() {
    return mount(TyporaComponent, {
      props: { win: { el, body, timers: [], data: {} } },
      attachTo: body,
    })
  }

  function textarea() { return body.querySelector('textarea') as HTMLTextAreaElement }
  function preview() { return body.querySelector('.typora-preview') as HTMLElement }

  // ==================== DOM 结构 ====================
  describe('DOM 结构', () => {
    it('textarea 存在', () => {
      mountComponent()
      expect(textarea()).toBeTruthy()
    })

    it('预览区存在', () => {
      mountComponent()
      expect(preview()).toBeTruthy()
    })

    it('textarea placeholder 包含 Markdown', () => {
      mountComponent()
      expect(textarea().placeholder).toContain('Markdown')
    })
  })

  // ==================== Markdown 渲染 ====================
  describe('Markdown 渲染', () => {
    it('h1 标题渲染为 <h1>', () => {
      mountComponent()
      expect(preview().innerHTML).toContain('<h1>')
    })

    it('粗体渲染为 <b>', () => {
      mountComponent()
      expect(preview().innerHTML).toContain('<b>')
    })

    it('代码渲染为 <code>', () => {
      mountComponent()
      expect(preview().innerHTML).toContain('<code>')
    })

    it('列表渲染为 ty-li', () => {
      mountComponent()
      expect(preview().innerHTML).toContain('ty-li')
    })

    it('空行渲染为 spacer', () => {
      mountComponent()
      expect(preview().innerHTML).toContain('height:10px')
    })

    it('h2 渲染', () => {
      mountComponent()
      expect(preview().innerHTML).toBeTruthy()
    })
  })

  // ==================== 编辑 ====================
  describe('编辑', () => {
    it('输入后 debounce 更新预览', async () => {
      vi.useFakeTimers()
      mountComponent()

      textarea().value = '# 新标题'
      textarea().dispatchEvent(new Event('input', { bubbles: true }))

      vi.advanceTimersByTime(200)
      await nextTick()

      expect(preview().innerHTML).toContain('<h1>')
      vi.useRealTimers()
    })

    it('中文标题正确渲染', async () => {
      vi.useFakeTimers()
      mountComponent()

      textarea().value = '# 中文标题'
      textarea().dispatchEvent(new Event('input', { bubbles: true }))

      vi.advanceTimersByTime(200)
      await nextTick()

      expect(preview().innerHTML).toContain('中文标题')
      vi.useRealTimers()
    })

    it('多行 Markdown 正确渲染', async () => {
      vi.useFakeTimers()
      mountComponent()

      textarea().value = '# A\n## B\n- C'
      textarea().dispatchEvent(new Event('input', { bubbles: true }))

      vi.advanceTimersByTime(200)
      await nextTick()

      const html = preview().innerHTML
      expect(html).toContain('<h1>')
      expect(html).toContain('<h2>')
      expect(html).toContain('ty-li')
      vi.useRealTimers()
    })
  })

  // ==================== 边界 ====================
  describe('边界', () => {
    it('空输入预览不崩溃', async () => {
      vi.useFakeTimers()
      mountComponent()

      textarea().value = ''
      textarea().dispatchEvent(new Event('input', { bubbles: true }))

      vi.advanceTimersByTime(200)
      await nextTick()
      // 不抛错即为通过
    })

    it('极长文本不崩溃', async () => {
      vi.useFakeTimers()
      mountComponent()

      textarea().value = 'A'.repeat(5000)
      textarea().dispatchEvent(new Event('input', { bubbles: true }))

      vi.advanceTimersByTime(200)
      await nextTick()
    })

    it('HTML 标签被转义', async () => {
      vi.useFakeTimers()
      mountComponent()

      textarea().value = '<div>test</div>'
      textarea().dispatchEvent(new Event('input', { bubbles: true }))

      vi.advanceTimersByTime(200)
      await nextTick()

      expect(preview().innerHTML).not.toContain('<div>')
      vi.useRealTimers()
    })

    it('连续快速输入 debounce 合并', async () => {
      vi.useFakeTimers()
      mountComponent()

      textarea().value = 'A'
      textarea().dispatchEvent(new Event('input', { bubbles: true }))
      vi.advanceTimersByTime(50)

      textarea().value = 'B'
      textarea().dispatchEvent(new Event('input', { bubbles: true }))
      vi.advanceTimersByTime(200)
      await nextTick()

      expect(preview().textContent).toContain('B')
      vi.useRealTimers()
    })
  })

  // ==================== 卸载 ====================
  describe('卸载', () => {
    it('卸载后 DOM 清理干净', () => {
      const wrapper = mountComponent()
      wrapper.unmount()
      expect(body.children).toHaveLength(0)
    })
  })
})