import rehypeStringify from "rehype-stringify";
import remarkFrontmatter from "remark-frontmatter";
import remarkParse from "remark-parse";
import remarkRehype from "remark-rehype";
import { unified } from "unified";
import { readdir, readFile, writeFile } from "fs-extra";

export async function frontmatterJson(path) {
  let output = [];

  // NOTE Reads the content folder
  const inputFolder = await readdir(path, {
    recursive: true,
    withFileTypes: true,
  });

  // NOTE Iterates over content files
  for (let file of inputFolder) {
    if (file.isFile()) {
      let filepath = file.path + "/" + file.name;
      console.log(filepath);
      output.push(await parseFrontmatter(filepath));
    }
  }

  output
    .sort((a, b) => new Date(a.date).getTime() - new Date(b.date).getTime())
    .reverse();
  return output;
}

// NOTE builds the Markdown --> HTML processor
async function parseFrontmatter(filepath) {
  let meow;
  let frontmatter;
  const processor = unified()
    .use(remarkParse)
    .use(remarkFrontmatter, "yaml")
    .use(() => (tree) => {
      frontmatter = tree.children[0].value;
      if (tree.children[0].type == "yaml") {
        frontmatter = Object.fromEntries(
          frontmatter.split("\n").map((line) => line.split(": ")),
        );
        frontmatter.permalink ??= filepath.split("/").pop().replace(".md", "");
        meow = frontmatter;
      } else {
        console.error("  ERROR: Frontmatter not found");
        process.exit();
      }
    });
  processor.run(processor.parse(await readFile(filepath, "utf8")));
  return meow;
}