// Tab 键集成测试（审计 E1 定性）：向组装好的编辑器派发真实 keydown 事件，
// 验证表格跳格 / 代码块行首缩进到底由哪个插件处理——此前的测试都是直调函数，
// 从未验证过 Milkdown 自带 indent 插件（对 Tab 无条件插两空格）是否抢先。
import { describe, it, expect } from 'vitest'
import { createMarkdownEditor, getMarkdown } from '../src/editor/editor'
import { editorViewCtx } from '@milkdown/kit/core'
import { TextSelection } from '@milkdown/kit/prose/state'

const MD = [
  '普通段落文字。',
  '',
  '| A | B |',
  '| --- | --- |',
  '| 甲一 | 乙二 |',
  '',
  '```ts',
  'const x = 1',
  '```',
  '',
].join('\n')

function dispatchTab(host: HTMLElement, editor: ReturnType<typeof createMarkdownEditor>, shift = false) {
  const view = editor.action((ctx) => ctx.get(editorViewCtx))
  const event = new KeyboardEvent('keydown', { key: 'Tab', shiftKey: shift, bubbles: true, cancelable: true })
  view.dom.dispatchEvent(event)
  return event
}

function setCursorIn(editor: ReturnType<typeof createMarkdownEditor>, needle: string, offsetInText = 1) {
  editor.action((ctx) => {
    const view = ctx.get(editorViewCtx)
    let target = -1
    view.state.doc.descendants((node, pos) => {
      if (target < 0 && node.isText && node.text?.includes(needle)) {
        target = pos + node.text.indexOf(needle) + offsetInText
      }
      return target < 0
    })
    if (target < 0) throw new Error(`找不到文本 ${needle}`)
    view.dispatch(view.state.tr.setSelection(TextSelection.create(view.state.doc, target)))
    view.focus()
  })
}

function cursorCellText(editor: ReturnType<typeof createMarkdownEditor>): string {
  return editor.action((ctx) => {
    const view = ctx.get(editorViewCtx)
    return view.state.selection.$from.parent.textContent
  })
}

describe('Tab 键真实派发', () => {
  it('表格内 Tab 跳到下一个单元格而不是插入空格', async () => {
    const host = document.createElement('div')
    document.body.appendChild(host)
    const editor = createMarkdownEditor(host, MD)
    await editor.create()
    setCursorIn(editor, '甲一')
    const before = getMarkdown(editor)
    dispatchTab(host, editor)
    expect(cursorCellText(editor)).toBe('乙二')
    expect(getMarkdown(editor)).toBe(before) // 文档未被插入空格改动
    await editor.destroy()
    host.remove()
  })

  it('代码块内 Tab 在行首缩进（光标在行中时）', async () => {
    const host = document.createElement('div')
    document.body.appendChild(host)
    const editor = createMarkdownEditor(host, MD)
    await editor.create()
    setCursorIn(editor, 'const x = 1', 4) // 光标停在 "con|st" 处
    dispatchTab(host, editor)
    const md = getMarkdown(editor)
    expect(md).toContain('  const x = 1') // 行首多了两空格
    expect(md).not.toContain('con  st') // 不是在光标处插空格
    await editor.destroy()
    host.remove()
  })
})