import { BlogCollectionItem } from '@nuxt/content'

const clean = (value: string) => value
  .replace(/&/g, '&')
  .replace(/</g, '&lt;')
  .replace(/>/g, '&gt;')
  .replace(/ä/g, '&auml;')
  .replace(/ö/g, '&ouml;')
  .replace(/ü/g, '&uuml;')
  .replace(/ß/g, '&szlig;')

const makeItem = (article: BlogCollectionItem, base: string) => `
    <item>
      <title>${clean(article.title)}</title>
      <description>${clean(article.description)}</description>
      <link>${base}${article.path}</link>
    </item>
`

const simpleDate = (date: Date) => {
  date.setDate(date.getDate() + 1)
  return `${date.getFullYear()}-${`${date.getMonth() + 1}`.padStart(2, '0')}-${date.getDate()}`
}

export default defineEventHandler(async event => {
  const baseUrl = getRequestURL(event)
  const blogUrl = `${baseUrl.protocol}//${baseUrl.host}`

  const articles = await queryCollection(event, 'blog')
    .where('date', '<', simpleDate(new Date()))
    .order('date', 'DESC')
    .all()

  const xmlItems = articles.map(article => makeItem(article, blogUrl)).join('')

  return `<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
  <channel>
    <title>Blogfussel</title>
    <link>${baseUrl}/blog</link>
    <description>f&uuml;r mehr Fussel im Blog</description> 
    <language>de</language>
    ${xmlItems}
  </channel>
</rss>
  `
})