import * as yaml from 'js-yaml'
import Turndown from 'turndown'

// @ts-ignore
import * as turndownPluginGfm from 'turndown-plugin-gfm'

const turndown = new Turndown({
  headingStyle: 'atx',
  fence: '```',
  emDelimiter: '_',
  strongDelimiter: '**',
  linkStyle: 'inlined',
  linkReferenceStyle: 'full',
  codeBlockStyle: 'fenced',
  bulletListMarker: '-',
})

turndown.use([turndownPluginGfm.tables, turndownPluginGfm.strikethrough])

export const htmlToMarkdown = async (
  html: string,
  metadata?: Record<string, any>,
) => {
  const markdown = turndown.turndown(html)
  if (!metadata) return markdown

  return metadataToMarkdown(metadata) + markdown
}

export const metadataToMarkdown = (metadata: Record<string, any>) => {
  return `---\n${yaml.dump(metadata)}---\n\n`
}