const fs = require('fs');
const path = require('path');
const { promisify } = require('util');
const extract = require('./extract');

// Promisified fs functions
const readdirAsync = promisify(fs.readdir);
const readFileAsync = promisify(fs.readFile);
const writeFileAsync = promisify(fs.writeFile);

// Source and destination paths
const markdownPath = path.resolve(__dirname, '../markdown');
const jsonPath = path.resolve(__dirname, '../../front/src/resources/markdown.json');

async function run(filterFunc) {
  const allFiles = await readdirAsync(markdownPath);
  const tutoFiles = allFiles.filter(filterFunc);
  const promises = tutoFiles.map(async tuto => {
    const tutoPath = path.join(markdownPath, tuto);
    const buf = await readFileAsync(tutoPath);
    const md = buf.toString();
    console.log(md.split('\n').shift());
    try {
      return extract(md);
    } catch (err) {
      console.log(err.message);
    }
  });
  const tutos = await Promise.all(promises);
  const json = JSON.stringify(tutos);
  await writeFileAsync(jsonPath, json);
  process.exit();
}

const filterFunc = f => f.startsWith('tutor');

run(filterFunc);