/**
 * @copyright nhcarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */

import { readFileSync, readdirSync } from "node:fs";
import { join } from "node:path";
import matter from "gray-matter";

const postsDirectory = join(process.cwd(), "posts");

/**
 * Reads the posts directory and returns an array of post data.
 * @returns An array of parsed frontmatter and file contents.
 */
const getSortedPostsData = (): Array<{
  content: string;
  data:    { date: Date; summary: string; title: string };
  slug:    string;
}> => {
  const fileNames = readdirSync(postsDirectory);
  const allPostsData = fileNames.map((fileName) => {
    const slug = fileName.replace(/\.md$/, "");
    const fullPath = join(postsDirectory, fileName);
    const fileContents = readFileSync(fullPath, "utf8");
    // eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- matter doesn't take a generic I guess?
    const matterResult = matter(fileContents) as unknown as {
      content: string;
      data:    { title: string; date: string; summary: string };
    };
    return {
      content: matterResult.content,
      data:    {
        date:    new Date(matterResult.data.date),
        summary: matterResult.data.summary,
        title:   matterResult.data.title,
      },
      slug: slug,
    };
  });
  return allPostsData.sort((a, b) => {
    if (a.data.date < b.data.date) {
      return 1;
    }
    return -1;
  });
};

/**
 * Reads a single post file.
 * @param slug - The slug of the post to read.
 * @returns The parsed frontmatter and file contents.
 */
const getPostData = (
  slug: string,
): {
  content: string;
  data:    { date: Date; summary: string; title: string };
  slug:    string;
} => {
  const fullPath = join(postsDirectory, `${slug}.md`);
  const fileContents = readFileSync(fullPath, "utf8");
  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- matter doesn't take a generic I guess?
  const matterResult = matter(fileContents) as unknown as {
    content: string;
    data:    { title: string; date: string; summary: string };
  };
  return {
    content: matterResult.content,
    data:    {
      date:    new Date(matterResult.data.date),
      summary: matterResult.data.summary,
      title:   matterResult.data.title,
    },
    slug: slug,
  };
};

export { getSortedPostsData, getPostData };