import crypto from 'crypto';

const ENCRYPTION_KEY = process.env.ENCRYPTION_KEY;
const IV_LENGTH = 16;

const encrypt = (text: string) => {
  const iv = crypto.randomBytes(IV_LENGTH);
  const cipher = crypto.createCipheriv(
    'aes-256-cbc',
    Buffer.from(ENCRYPTION_KEY as string),
    iv
  );
  let encrypted = cipher.update(text);

  encrypted = Buffer.concat([encrypted, cipher.final()]);
  return iv.toString('hex') + ':' + encrypted.toString('hex');
};

const decrypt = (text: string) => {
  const textParts = text.split(':');
  const iv = Buffer.from(textParts.shift() || '', 'hex');
  const encryptedText = Buffer.from(textParts.join(':'), 'hex');

  const decipher = crypto.createDecipheriv(
    'aes-256-cbc',
    Buffer.from(ENCRYPTION_KEY as string),
    iv
  );
  let decrypted = decipher.update(encryptedText);

  decrypted = Buffer.concat([decrypted, decipher.final()]);
  return decrypted.toString();
};

export { decrypt, encrypt };