mindflux/src/main/java/com/example/mindflux/service/UserServiceImpl.java

package com.example.mindflux.service;

import com.example.mindflux.model.User;
import com.example.mindflux.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserRepository userRepository;

    @Override
    public User findByUsername(String username) {
        return userRepository.findByUsername(username).orElse(null); // <-- Optional aufgelöst
    }

    @Override
    public void save(User user) {
        userRepository.save(user);
    }

    @Override
    public void deleteByUsername(String username) {
        userRepository.deleteByUsername(username);
    }
}