import { describe, it, expect } from 'vitest'
import { escapeHtml, highlightDiff } from '../../../src/utils/comparator/html.js'

describe('comparator/html', () => {
  describe('escapeHtml', () => {
    it('escapes special HTML characters', () => {
      expect(escapeHtml('<script>"\'&</script>')).toBe(
        '&lt;script&gt;&quot;&#39;&amp;&lt;/script&gt;'
      )
    })

    it('handles empty string', () => {
      expect(escapeHtml('')).toBe('')
    })

    it('coerces non-string values', () => {
      expect(escapeHtml(123)).toBe('123')
    })
  })

  describe('highlightDiff', () => {
    it('returns escaped text when no ranges', () => {
      expect(highlightDiff('hello', [])).toBe('hello')
      expect(highlightDiff('a<b', null)).toBe('a&lt;b')
    })

    it('wraps diff ranges with highlight span', () => {
      const result = highlightDiff('hello', [{ start: 1, end: 4 }])
      expect(result).toBe('h<span class="diff-highlight">ell</span>o')
    })

    it('handles multiple ranges', () => {
      const result = highlightDiff('abcdef', [
        { start: 0, end: 1 },
        { start: 4, end: 6 },
      ])
      expect(result).toContain('<span class="diff-highlight">a</span>bcd')
      expect(result).toContain('<span class="diff-highlight">ef</span>')
    })
  })
})