import { Service } from "@tsed/di";
import crypto from "crypto";

@Service()
export class EncryptionService {
  private algorithm = 'aes-256-cbc';
  private key = crypto.randomBytes(32);

  async encrypt(text: string): Promise<{ encryptedText: string; iv: string }> {
    const iv = crypto.randomBytes(16);
    const cipher = crypto.createCipheriv(this.algorithm, this.key, iv);
    let encrypted = cipher.update(text, 'utf8', 'hex');
    encrypted += cipher.final('hex');
    return { encryptedText: encrypted, iv: iv.toString('hex') };
  }

  async decrypt(encryptedText: string, iv: string): Promise<string> {
    const decipher = crypto.createDecipheriv(this.algorithm, this.key, Buffer.from(iv, 'hex'));
    let decrypted = decipher.update(encryptedText, 'hex', 'utf8');
    decrypted += decipher.final('utf8');
    return decrypted;
  }
}