import { glob } from "glob";
import { readFile } from "fs-extra";
import { unified } from "unified";
import remarkParse from "remark-parse";
import remarkFrontmatter from "remark-frontmatter";
const yaml = require("js-yaml");

export async function extractFrontmatter(filepath) {
  let frontmatter;

  const processor = unified()
    .use(remarkParse)
    .use(remarkFrontmatter, "yaml")
    .use(() => (tree) => {
      frontmatter = yaml.load(tree.children[0].value, {
        schema: yaml.FAILSAFE_SCHEMA,
      });
      frontmatter.filename = filepath.split("/").pop().split(".").shift();
    });
  processor.run(processor.parse(await readFile(filepath, "utf-8")));

  return frontmatter;
}

export async function createSiteIndex() {
  let siteIndex = [];
  for (const file of await glob("input/**/*.md", { nodir: true })) {
    siteIndex.push(await extractFrontmatter(file));
  }
  return siteIndex;
}