import { readdir } from "node:fs/promises";
import { YAML } from "bun";
import metadata from "./metadata.json";

const templateRaw = await Bun.file("./template.html").text();
const template = templateRaw
  .replace("[[NAME]]", metadata.name)
  .replace("[[YEAR]]", new Date().getFullYear().toString());
const posts = await readdir("./posts");

const defaultFrontmatter = {
  thumb: "",
  title: "Untitled",
  desc: "",
  date: "00-00-0000", // DD-MM-YYYY
  tags: [] as never[],
  draft: true,
};

function fetchFrontmatter(raw?: string) {
  try {
    if (!raw) throw new Error("No frontmatter found.");
    return { ...defaultFrontmatter, ...(YAML.parse(raw) as typeof defaultFrontmatter) };
  } catch {
    console.warn("Failed to parse frontmatter. Using default values.");
    return { ...defaultFrontmatter };
  }
}

posts.forEach(async (post) => {
  console.log(`Processing ${post}...`);
  const raw = (await Bun.file(`./posts/${post}`).text()).split("^---");

  const content = raw.at(-1) || "No content";
  
  const frontmatter = fetchFrontmatter(raw.at(0));
  
  const html = Bun.markdown.html(content, {
    tables: true,
    strikethrough: true,
    tasklists: true,
    autolinks: true,
    headings: true,
    hardSoftBreaks: true,
    wikiLinks: true,
    underline: true,
    latexMath: true,
    collapseWhitespace: true,
    permissiveAtxHeaders: true,
    noIndentedCodeBlocks: true,
    noHtmlBlocks: true,
    noHtmlSpans: true,
    tagFilter: true,
  });
  const render = template
    .replaceAll("[[TITLE]]", `${metadata.title} - ${frontmatter.title}`)
    .replace("[[CONTENT]]", html);
  
  await Bun.write(`./dist/posts/${post.replace(".md", ".html")}`, render);
});