import type { ContentData } from 'vitepress'
import { createContentLoader } from 'vitepress'
import { groupBy } from '../utils'

interface Post {
  title: string
  url: string
  date: string
}

// prettier-ignore
type Dictionary = ReturnType<typeof createContentLoader>;

declare const data: Dictionary
export { data }

// prettier-ignore
function transformRawPosts(rawPosts: ContentData[]): Record<string, Post[]> {
	const posts: Post[] = rawPosts
		.map(({ url, frontmatter }) => ({
			title: frontmatter.title,
			url,
			date: (frontmatter.date as Date).toISOString().slice(0, 10),
		}))
		.sort((a, b) => b.date.localeCompare(a.date));

	return groupBy(posts, (post) => post.date.slice(0, 4));
}

export default createContentLoader('posts/*.md', {
  includeSrc: true,
  transform: (raw) => transformRawPosts(raw)
})