import path from 'path';

const ARTICLE_PATH = 'src/routes/articles';

const getFileDates = async (file: string) => {
  const datePromises = [
    Bun.$`git log -1 --format="%cd" --date=format:"%Y-%m-%d %H:%M:%S" ${ARTICLE_PATH}/${file}`.text(),
    Bun.$`git log -1 --reverse --format="%cd" --date=format:"%Y-%m-%d" ${ARTICLE_PATH}/${file}`.text()
  ];

  const dates = await Promise.all(datePromises);


  return dates.map((d: string) => {
    if (!d) { return new Date(); }
    return new Date(d);
  });
};

export const generateBlogData = async () => {
  try {
    const glob = new Bun.Glob('**/+page.svx');
    const files = Array.from(glob.scanSync(ARTICLE_PATH))
    const data = await Promise.all(
      files.map(async (file) => {
        const [updated, created] = await getFileDates(file);
        const fullname = file.replace('/+page.svx', '');
        const title = fullname.replace(/d+-/, "").replace(/^\d+-/, '');
        return { title, updated, created, path: `/articles/${fullname} ` };
      })
    );


    await Bun.write(
      path.join('src/lib/articles.json'),
      JSON.stringify({
        articles: data
      })
    );
  } catch (e) {
    console.error('Error generating blog data');
    console.log(e);
  }
};

export default function () {
  const glob = new Bun.Glob('**/src/routes/articles/*/+page.svx');

  return {
    name: 'articles',
    buildStart: {
      order: 'first',
      handler: async () => {
        await generateBlogData();
      }
    },
    watchChange: async (id: string, change: { event: string }) => {
      if (!glob.match(id) && change.event) {
        return;
      }
      await generateBlogData();
    }
  };
}