Facebook/BE/src/main/java/org/example/services/UserService.java

package org.example.services;

import org.example.models.User;
import org.example.repositories.PostRepository;
import org.example.repositories.UserRepository;
import org.example.requests.CreateUserRequest;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;

@Service
public class UserService {
    private final UserRepository userRepository;

    private final PasswordEncoder passwordEncoder;
    private final PostRepository postRepository;

    public UserService(UserRepository userRepository, PasswordEncoder passwordEncoder, PostRepository postRepository) {
        this.userRepository = userRepository;
        this.passwordEncoder = passwordEncoder;
        this.postRepository = postRepository;
    }

    public User createUser(CreateUserRequest request) {
        if (userRepository.existsByUsername(request.getUsername())) {
            throw new IllegalArgumentException("Username already exists. Please choose a different username.");
        }
        User user = new User();

        user.setName(request.getName());
        // TODO: make sure that this username doesn't exist.
        user.setUsername(request.getUsername());
        user.setRoles(request.getRoles());
        user.setPassword(passwordEncoder.encode(request.getPassword()));

        userRepository.save(user);

        return user;
    }
    public void addFriend(String username1, String username2) {
        userRepository.addFriend(username1,username2);
    }
}