const fs = require('fs'); 
const path = require('path'); 
const crypto = require('crypto'); 
const secret = crypto.randomBytes(256).toString('hex');
const { NODE_ENV } = process.env; 
let confFile = 'default.json'; 

if(NODE_ENV && NODE_ENV.toLowerCase() === 'production') {
  confFile = 'production.json'; 
}
let config = require('./config/' + confFile); 
let configPath = path.join(__dirname, 'config', confFile); 

if(!config.authentication) {
  config.authentication = { secret }; 
} else {
  config.authentication.secret = secret; 
}
fs.writeFile(configPath, JSON.stringify(config, null, 2) + '\n',
  err => {
    if(err) return console.error(err); 
    console.log('\nAuthentication secret successfully updated in', confFile); 
  }
);