import { describe, expect, it } from 'vitest'

import { preprocessMarkdown } from './markdown-text'

describe('preprocessMarkdown', () => {
  it('strips inline accidental triple-backtick starts', () => {
    const input = [
      'Working as intended.',
      "Here's your scene: ``` http://localhost:8812/",
      '',
      '- **Multicolored cube**',
      '- **Rotates**'
    ].join('\n')

    const output = preprocessMarkdown(input)

    expect(output).not.toContain('```')
    expect(output).toContain("Here's your scene:")
    expect(output).not.toContain('http://localhost:8812/')
    expect(output).toContain('- **Multicolored cube**')
  })

  it('demotes invalid fenced prose blocks with closers', () => {
    const fence = '```'

    const input = [
      `${fence} http://localhost:8812/`,
      '- **Scroll wheel** - zoom',
      '- **Right-drag/pan** - disabled',
      fence
    ].join('\n')

    const output = preprocessMarkdown(input)

    expect(output).not.toContain('```')
    expect(output).not.toContain('http://localhost:8812/')
    expect(output).toContain('- **Scroll wheel** - zoom')
  })

  it('drops fences around a preview-only URL block', () => {
    const fence = '```'
    const input = ['Server is back.', '', fence, 'http://localhost:8812/', fence].join('\n')

    const output = preprocessMarkdown(input)

    expect(output).toContain('Server is back.')
    expect(output).not.toContain('```')
    expect(output).not.toContain('http://localhost:8812/')
  })

  it('demotes prose sentence masquerading as fence info', () => {
    const input = ['```Heads up - a bunny got added', '- Pure white (`#ffffff`)', '- Ambient dropped to 0.18'].join(
      '\n'
    )
    const output = preprocessMarkdown(input)

    expect(output).not.toContain('```heads')
    expect(output).toContain('Heads up - a bunny got added')
    expect(output).toContain('- Pure white (`#ffffff`)')
  })

  it('keeps valid code fences intact', () => {
    const fence = '```'
    const input = [`${fence}ts`, 'const value = 1;', fence].join('\n')

    const output = preprocessMarkdown(input)

    expect(output).toContain('```ts')
    expect(output).toContain('const value = 1;')
  })

  it('keeps dangling real code fences during streaming', () => {
    const input = ['```ts', 'const value = 1;'].join('\n')
    const output = preprocessMarkdown(input)

    expect(output.startsWith('```ts')).toBe(true)
    expect(output).toContain('const value = 1;')
  })

  it('demotes dangling prose fences', () => {
    const input = ['```', '- Pure white (`#ffffff`)', '- Ambient dropped to 0.18'].join('\n')
    const output = preprocessMarkdown(input)

    expect(output).not.toContain('```')
    expect(output).toContain('- Pure white (`#ffffff`)')
  })
})