import * as crypto from 'crypto';

export function encrypt(text: string) {
  const secret = process.env.KEY_SECRET;
  if (!secret) throw new Error('Falta la variable de entorno KEY_SECRET');

  const key = crypto.scryptSync(secret, 'salt', 32);
  const iv = crypto.randomBytes(16);
  const cipher = crypto.createCipheriv('aes-256-cbc', key, iv);

  let encrypted = cipher.update(text, 'utf8', 'hex');
  encrypted += cipher.final('hex');

  return {
    iv: iv.toString('hex'),
    encryptedData: encrypted,
  };
}

export function decrypt(encryptedData: string, ivHex: string) {
  const secret = process.env.KEY_SECRET;
  if (!process.env.KEY_SECRET) {
    throw new Error('Falta la variable de entorno KEY_SECRET');
  }
  if (!secret) throw new Error('Falta la variable de entorno KEY_SECRET');

  const key = crypto.scryptSync(secret, 'salt', 32);
  const iv = Buffer.from(ivHex, 'hex');
  const decipher = crypto.createDecipheriv('aes-256-cbc', key, iv);

  let decrypted = decipher.update(encryptedData, 'hex', 'utf8');
  decrypted += decipher.final('utf8');

  return decrypted;
}