import fs from 'node:fs';
import zlib from 'node:zlib';
import color from 'chalk';

const data = fs.readFileSync('data/products.csv', 'utf-8');

const toCamelCase = (str) => {
  return str
    .trim()
    .toLowerCase()
    .replace(/[^a-zA-Z0-9]+(.)/g, (match, chr) => chr.toUpperCase());
};

const convertCsvToJson = (products, ar) => {
  const resultAr = products.map((str) => {
    const fields = str.split(/\s*,\s*/);

    const labels = ar.map((label, idx) => {
      return [label, isNaN(fields[idx]) ? fields[idx] : Number(fields[idx])];
    });

    const obj = Object.fromEntries(labels);

    // console.log(labels); // Entries Array
    //console.log(obj);

    return obj;

    // return {
    //   [ar[0]]: fields[0],
    //   [ar[1]]: fields[1],
    //   [ar[2]]: fields[2],
    //   [ar[3]]: Number(fields[3]),
    //   [ar[4]]: Number(fields[4]),
    // };
  });
  // console.log(resultAr);

  const jsonStr = JSON.stringify(resultAr, '', 2);

  fs.writeFile('products.json.gz', zlib.gzipSync(jsonStr), 'utf-8', (err) => {
    if (err) {
      console.log(err);
    } else {
      console.log(color.green('file created!'));
    }
  });
};

const productAr = data
  .split('\n')
  .map((row) => row.replace('\n', ''))
  .filter((row) => row !== '');

const headerAr = productAr
  .shift()
  .split(/\s*,\s*/)
  .map(toCamelCase);

// console.log('=======');
// console.log(productAr);

convertCsvToJson(productAr, headerAr);