import { describe, it, expect } from 'vitest'
import { anchorFromMarkdown, offsetInMarkdown, findBlockIndex } from '../src/editor/cursorSync'

const MD = '# 标题一行\n\n正文段落内容。\n\n- 列表项甲\n- [ ] 任务项乙\n\n> 引用一句\n'

describe('光标锚点同步', () => {
  it('源码偏移 → 锚点：剥掉标题/列表/引用标记', () => {
    const headingOffset = MD.indexOf('标题一行') + 2
    expect(anchorFromMarkdown(MD, headingOffset)).toEqual({ blockText: '标题一行', offsetInBlock: 2 })
    const taskOffset = MD.indexOf('任务项乙') + 1
    expect(anchorFromMarkdown(MD, taskOffset)).toEqual({ blockText: '任务项乙', offsetInBlock: 1 })
    const quoteOffset = MD.indexOf('引用一句')
    expect(anchorFromMarkdown(MD, quoteOffset)).toEqual({ blockText: '引用一句', offsetInBlock: 0 })
  })

  it('锚点 → 源码偏移：往返一致', () => {
    for (const text of ['标题一行', '正文段落内容。', '列表项甲', '任务项乙', '引用一句']) {
      const start = MD.indexOf(text)
      const anchor = anchorFromMarkdown(MD, start + 1)
      expect(offsetInMarkdown(MD, anchor)).toBe(start + 1)
    }
  })

  it('找不到锚点时回落 0，不抛错', () => {
    expect(offsetInMarkdown(MD, { blockText: '不存在的块', offsetInBlock: 3 })).toBe(0)
    expect(anchorFromMarkdown('', 10)).toEqual({ blockText: '', offsetInBlock: 0 })
  })

  it('findBlockIndex 精确优先、子串兜底', () => {
    const blocks = ['标题一行', '正文段落内容。', '列表项甲']
    expect(findBlockIndex(blocks, { blockText: '正文段落内容。', offsetInBlock: 0 })).toBe(1)
    expect(findBlockIndex(blocks, { blockText: '正文段落', offsetInBlock: 0 })).toBe(1)
    expect(findBlockIndex(blocks, { blockText: '没有', offsetInBlock: 0 })).toBe(-1)
  })
})