import { describe, test, expect } from 'vitest'
import {
  tiptapHTMLToMarkdown,
  markdownToHTML,
  looksLikeMarkdown,
  extractMarkdownTitle,
} from '../../lib/editor/markdown-export'

describe('looksLikeMarkdown', () => {
  test('detects H1 heading', () => {
    expect(looksLikeMarkdown('# Hello World')).toBe(true)
  })

  test('detects unordered list', () => {
    expect(looksLikeMarkdown('- Item one\n- Item two')).toBe(true)
    expect(looksLikeMarkdown('* Item one')).toBe(true)
  })

  test('detects ordered list', () => {
    expect(looksLikeMarkdown('1. First\n2. Second')).toBe(true)
  })

  test('detects blockquote', () => {
    expect(looksLikeMarkdown('> This is a quote')).toBe(true)
  })

  test('detects code fence', () => {
    expect(looksLikeMarkdown('```\nconst x = 1\n```')).toBe(true)
  })

  test('detects inline code', () => {
    expect(looksLikeMarkdown('Use `console.log()` for debugging')).toBe(true)
  })

  test('detects bold', () => {
    expect(looksLikeMarkdown('This is **bold** text')).toBe(true)
  })

  test('detects italic', () => {
    expect(looksLikeMarkdown('This is *italic* text')).toBe(true)
  })

  test('detects table', () => {
    expect(looksLikeMarkdown('| Col1 | Col2 |\n|------|------|')).toBe(true)
  })

  test('detects link', () => {
    expect(looksLikeMarkdown('See [TipTap docs](https://tiptap.dev)')).toBe(true)
  })

  test('does NOT flag plain prose as Markdown', () => {
    expect(looksLikeMarkdown('This is a normal sentence without any markdown.')).toBe(false)
    expect(looksLikeMarkdown('Hello world, this is plain text.')).toBe(false)
  })

  test('does NOT flag very short text', () => {
    expect(looksLikeMarkdown('Hi')).toBe(false)
    expect(looksLikeMarkdown('')).toBe(false)
  })
})

describe('tiptapHTMLToMarkdown', () => {
  test('converts H1 to # heading', () => {
    const md = tiptapHTMLToMarkdown('<h1>Hello</h1>')
    expect(md).toBe('# Hello')
  })

  test('converts H2 to ## heading', () => {
    const md = tiptapHTMLToMarkdown('<h2>Section</h2>')
    expect(md).toBe('## Section')
  })

  test('converts H3 to ### heading', () => {
    const md = tiptapHTMLToMarkdown('<h3>Sub</h3>')
    expect(md).toBe('### Sub')
  })

  test('converts bold text', () => {
    const md = tiptapHTMLToMarkdown('<p>This is <strong>bold</strong> text.</p>')
    expect(md).toContain('**bold**')
  })

  test('converts italic text', () => {
    const md = tiptapHTMLToMarkdown('<p>This is <em>italic</em> text.</p>')
    expect(md).toContain('_italic_')
  })

  test('converts unordered list', () => {
    const md = tiptapHTMLToMarkdown('<ul><li>Item 1</li><li>Item 2</li></ul>')
    expect(md).toContain('Item 1')
    expect(md).toContain('Item 2')
    expect(md).toMatch(/^[-*+]\s/m)
  })

  test('converts ordered list', () => {
    const md = tiptapHTMLToMarkdown('<ol><li>First</li><li>Second</li></ol>')
    expect(md).toContain('1.  First')
    expect(md).toContain('2.  Second')
  })

  test('converts code block', () => {
    const md = tiptapHTMLToMarkdown('<pre><code>const x = 1;</code></pre>')
    expect(md).toContain('```')
    expect(md).toContain('const x = 1;')
  })

  test('converts blockquote', () => {
    const md = tiptapHTMLToMarkdown('<blockquote><p>Quote text</p></blockquote>')
    expect(md).toContain('> Quote text')
  })

  test('converts inline code', () => {
    const md = tiptapHTMLToMarkdown('<p>Use <code>console.log()</code> here.</p>')
    expect(md).toContain('`console.log()`')
  })

  test('converts hyperlink', () => {
    const md = tiptapHTMLToMarkdown('<p><a href="https://example.com">Example</a></p>')
    expect(md).toContain('[Example](https://example.com)')
  })

  test('handles empty HTML', () => {
    expect(tiptapHTMLToMarkdown('')).toBe('')
    expect(tiptapHTMLToMarkdown('   ')).toBe('')
  })

  test('preserves liveBlock as HTML comment', () => {
    const html = '<div data-live-block="true" sourceNoteId="abc" blockId="def"></div>'
    const md = tiptapHTMLToMarkdown(html)
    expect(md).toContain('<!-- live-block:')
  })

  test('preserves structuredViewBlock as HTML comment', () => {
    const html = '<div data-structured-view-block="true" data-sv-mode="table"></div>'
    const md = tiptapHTMLToMarkdown(html)
    expect(md).toContain('<!-- structured-view:')
  })
})

describe('markdownToHTML', () => {
  test('converts # H1 to h1 element', () => {
    const html = markdownToHTML('# Hello')
    expect(html.toLowerCase()).toContain('<h1>hello</h1>')
  })

  test('converts ## H2 to h2 element', () => {
    const html = markdownToHTML('## Section')
    expect(html.toLowerCase()).toContain('<h2>section</h2>')
  })

  test('converts bold markdown to <strong>', () => {
    const html = markdownToHTML('This is **bold** text.')
    expect(html).toContain('<strong>bold</strong>')
  })

  test('converts italic markdown to <em>', () => {
    const html = markdownToHTML('This is *italic* text.')
    expect(html).toContain('<em>italic</em>')
  })

  test('converts unordered list to <ul><li>', () => {
    const html = markdownToHTML('- Item 1\n- Item 2')
    expect(html).toContain('<ul>')
    expect(html).toContain('<li>Item 1</li>')
  })

  test('converts ordered list to <ol><li>', () => {
    const html = markdownToHTML('1. First\n2. Second')
    expect(html).toContain('<ol>')
    expect(html).toContain('<li>First</li>')
  })

  test('converts fenced code block to <pre><code>', () => {
    const html = markdownToHTML('```\nconst x = 1;\n```')
    expect(html).toContain('<pre>')
    expect(html).toContain('<code>')
    expect(html).toContain('const x = 1;')
  })

  test('converts GFM table to <table>', () => {
    const md = '| Name | Age |\n|------|-----|\n| Alice | 30 |'
    const html = markdownToHTML(md)
    expect(html).toContain('<table>')
    expect(html).toContain('<th>Name</th>')
    expect(html).toContain('Alice')
  })

  test('handles empty markdown', () => {
    expect(markdownToHTML('')).toBe('')
    expect(markdownToHTML('   ')).toBe('')
  })
})

describe('extractMarkdownTitle', () => {
  test('extracts first H1', () => {
    const md = '# My Note\n\nSome content'
    expect(extractMarkdownTitle(md)).toBe('My Note')
  })

  test('extracts H1 even with preceding content', () => {
    const md = 'Some preamble\n# The Title\n\nContent'
    expect(extractMarkdownTitle(md)).toBe('The Title')
  })

  test('returns null if no H1', () => {
    const md = '## Not an H1\n\nContent'
    expect(extractMarkdownTitle(md)).toBeNull()
  })

  test('returns null for empty string', () => {
    expect(extractMarkdownTitle('')).toBeNull()
  })

  test('handles H1 with leading spaces in title', () => {
    const md = '#   Spaced Title  '
    expect(extractMarkdownTitle(md)).toBe('Spaced Title')
  })
})