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

const readFile = promisify(fs.readFile);
const crud = {};
crud.baseDir = path.join(__dirname, './db');

// create

crud.create = (file, data) => {
  fs.open(`${crud.baseDir}/${file}.json`, 'wx', (err, identifier) => {
    if (!err) {
      let jsonArray = [];
      jsonArray.push(data);

      let stringData = JSON.stringify(jsonArray);

      fs.writeFile(identifier, stringData, err => {
        if (!err) {
          fs.close(identifier, err => {
            if (err) {
              console.log(err);
            } else console.log('no errors');
          });
        } else {
          console.log(err);
        }
      });
    }
  });
};

crud.create('cars', { name: 'Ford', price: '3000' });