// 阶段 2 验收：标记显隐装饰、代码块 Tab、任务列表勾选 DOM、列表命令、纯文本插入、IME 守卫判定。
import { describe, it, expect, afterEach } from 'vitest'
import type { Editor } from '@milkdown/kit/core'
import { editorViewCtx } from '@milkdown/kit/core'
import { TextSelection } from '@milkdown/kit/prose/state'
import { createMarkdownEditor, getMarkdown } from '../src/editor/editor'
import { applyCodeBlockIndent } from '../src/editor/plugins'
import { editorCommands } from '../src/editor/commands'
import { insertPlainText } from '../src/editor/paste'
import { isImeComposing } from '../src/utils/ime'

let editors: Editor[] = []
afterEach(async () => {
  for (const e of editors) { try { await e.destroy() } catch { /* ignore */ } }
  editors = []
  document.body.innerHTML = ''
})

async function load(md: string): Promise<Editor> {
  const root = document.createElement('div')
  document.body.appendChild(root)
  const editor = createMarkdownEditor(root, md)
  editors.push(editor)
  await editor.create()
  return editor
}

function setSelection(editor: Editor, pos: number) {
  editor.action((ctx) => {
    const view = ctx.get(editorViewCtx)
    view.dispatch(view.state.tr.setSelection(TextSelection.create(view.state.doc, pos)))
  })
}

function findTextPos(editor: Editor, text: string): number {
  let found = -1
  editor.action((ctx) => {
    const view = ctx.get(editorViewCtx)
    view.state.doc.descendants((node, pos) => {
      if (found < 0 && node.isText && node.text?.includes(text)) {
        found = pos + node.text.indexOf(text)
      }
      return found < 0
    })
  })
  return found
}

function markers(editor: Editor): string[] {
  let texts: string[] = []
  editor.action((ctx) => {
    const view = ctx.get(editorViewCtx)
    texts = [...view.dom.querySelectorAll('.md-marker')].map((el) => el.textContent ?? '')
  })
  return texts
}

describe('语法标记显隐', () => {
  it('光标在标题内显示 # 前缀，在粗体段内显示 **，移开后消失，且文档序列化不受影响', async () => {
    const md = '# 大标题\n\n普通段落里的**粗体字**在这里。\n'
    const editor = await load(md)
    // 初始选区在文档开头（标题内）
    expect(markers(editor).some((t) => t.includes('#'))).toBe(true)

    const boldPos = findTextPos(editor, '粗体字')
    expect(boldPos).toBeGreaterThan(0)
    setSelection(editor, boldPos + 1)
    const shown = markers(editor)
    expect(shown).toContain('**')
    expect(shown.some((t) => t.includes('#'))).toBe(false)

    // 移到段落末尾的纯文本处，标记应全部隐藏
    const endPos = findTextPos(editor, '在这里')
    setSelection(editor, endPos + 2)
    expect(markers(editor)).toEqual([])

    // 装饰不进文档：序列化与原文一致（往返稳定）
    expect(getMarkdown(editor)).toBe(md)
  })

  it('光标在引用内显示 > 前缀', async () => {
    const editor = await load('前文。\n\n> 引用内容在此。\n')
    const pos = findTextPos(editor, '引用内容')
    setSelection(editor, pos + 1)
    expect(markers(editor)).toContain('> ')
  })
})

describe('代码块 Tab', () => {
  it('代码块内 Tab 插入两空格，Shift+Tab 去掉', async () => {
    const editor = await load('```ts\nconst a = 1;\n```\n')
    const pos = findTextPos(editor, 'const')
    setSelection(editor, pos)
    editor.action((ctx) => {
      const view = ctx.get(editorViewCtx)
      expect(applyCodeBlockIndent(view as never, false)).toBe(true)
    })
    expect(getMarkdown(editor)).toContain('  const a = 1;')
    editor.action((ctx) => {
      const view = ctx.get(editorViewCtx)
      expect(applyCodeBlockIndent(view as never, true)).toBe(true)
    })
    expect(getMarkdown(editor)).toContain('const a = 1;')
    expect(getMarkdown(editor)).not.toContain('  const')
  })

  it('普通段落里不处理 Tab', async () => {
    const editor = await load('普通段落。\n')
    editor.action((ctx) => {
      const view = ctx.get(editorViewCtx)
      expect(applyCodeBlockIndent(view as never, false)).toBe(false)
    })
  })
})

describe('任务列表与列表命令', () => {
  it('任务列表渲染出可点击 checkbox，点击切换并序列化回 [x]', async () => {
    const editor = await load('- [ ] 待办事项\n- [x] 已完成\n')
    let firstBox: HTMLInputElement | null = null
    editor.action((ctx) => {
      const view = ctx.get(editorViewCtx)
      const boxes = view.dom.querySelectorAll('input[type="checkbox"]')
      expect(boxes.length).toBe(2)
      expect((boxes[1] as HTMLInputElement).checked).toBe(true)
      firstBox = boxes[0] as HTMLInputElement
    })
    firstBox!.click()
    expect(getMarkdown(editor)).toMatch(/-\s\[[xX]\]\s待办事项/)
    expect(getMarkdown(editor)).toMatch(/-\s\[[xX]\]\s已完成/)
  })

  it('段落转无序列表命令生效', async () => {
    const editor = await load('变成列表项\n')
    setSelection(editor, 2)
    editorCommands.bulletList(editor)
    expect(getMarkdown(editor)).toContain('- 变成列表项')
  })
})

describe('纯文本插入与 IME 守卫', () => {
  it('insertPlainText 在选区处插入并可撤销序列保留', async () => {
    const editor = await load('前后\n')
    setSelection(editor, 2)
    expect(insertPlainText(editor, '中间')).toBe(true)
    expect(getMarkdown(editor)).toContain('前中间后')
  })

  it('isImeComposing 判定', () => {
    expect(isImeComposing({ isComposing: true })).toBe(true)
    expect(isImeComposing({ keyCode: 229 })).toBe(true)
    expect(isImeComposing({ isComposing: false, keyCode: 13 })).toBe(false)
    expect(isImeComposing({})).toBe(false)
  })
})