import { Injectable } from "@nestjs/common";
import * as crypto from "node:crypto"

@Injectable()
export class HashService {
  hash(password: string): Promise<string> {
    return new Promise((resolve, reject) => {
      const salt = crypto.randomBytes(16).toString("hex");
      crypto.scrypt(password, salt, 64, (err, derivedKey) => {
          if (err) reject(err);
          const hash = `${salt}:${derivedKey.toString("hex")}`;
          resolve(hash);
      });
  });
  }

  compare(password: string, hash: string): Promise<boolean> {
    return new Promise((resolve, reject) => {
        const [salt, key] = hash.split(":");
        crypto.scrypt(password, salt, 64, (err, derivedKey) => {
            if (err) reject(err);
            resolve(key === derivedKey.toString("hex"));
        });
    });
  }
}