package com.valposystems.service;

import com.valposystems.dto.UserDTO;
import com.valposystems.model.User;
import com.valposystems.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class UserService {
    
    private final UserRepository userRepository;
    
    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }
    
    public List<UserDTO> getAllUsers() {
        return userRepository.findAll().stream()
                .map(UserDTO::from)
                .collect(Collectors.toList());
    }
    
    public UserDTO getUserById(Long id) {
        return userRepository.findById(id)
                .map(UserDTO::from)
                .orElse(null);
    }
    
    @Transactional
    public UserDTO createUser(UserDTO dto) {
        // Check if a user with that email already exists
        if (userRepository.existsByEmail(dto.getEmail())) {
            return null;
        }
        
        User user = new User();
        user.setName(dto.getName());
        user.setEmail(dto.getEmail());
        user.setPassword("password123"); // In a real app, this would be encrypted
        user.setProfilePicUrl(dto.getProfilePicUrl());
        user.setNotificationsEnabled(dto.isNotificationsEnabled());
        
        user = userRepository.save(user);
        
        return UserDTO.from(user);
    }
    
    @Transactional
    public UserDTO updateUser(Long id, UserDTO dto) {
        return userRepository.findById(id)
                .map(user -> {
                    user.setName(dto.getName());
                    user.setProfilePicUrl(dto.getProfilePicUrl());
                    user.setNotificationsEnabled(dto.isNotificationsEnabled());
                    return UserDTO.from(userRepository.save(user));
                })
                .orElse(null);
    }
}