package com.example.spring.security.service;

import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Service;

import com.example.spring.security.entity.User;
import com.example.spring.security.repository.UserRepository;

import jakarta.transaction.Transactional;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserRepository userRepository;

        @Override
    public Optional<User> findById(Long id) {
        return userRepository.findById(id);
    }

    @Override
    public List<User> findAll() {
        return userRepository.findAll(Sort.by(Sort.Direction.ASC, "username"));
    }

    @PreAuthorize("hasRole('ADMIN')")
    @Transactional
    @Override
    public void updateUser(Long id, String description) {
        // Do whatever the work needed.
        // ...

        Optional<User> userOpt = userRepository.findById(id);

        User user = userOpt.get();

        user.setDescription(description);

        // NO userRepository.save(user) IS ACTUALLY REQUIRED HERE since the method
        // has been annotated with @Transactional!
        // Transaction commits -> Hibernate issues the SQL UPDATE.
    }
}