import { createContentLoader, type ContentData } from "vitepress";
import { groupBy } from "../utils";

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

type Dictionary = ReturnType<typeof transformRawPosts>;

declare const data: Dictionary;
export { data };

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),
});