package boundary;

import entity.User;

import java.util.LinkedList;
import java.util.List;

public class UserService {

    private List<User> users;

    public UserService()
    {
        users=new LinkedList<User>();
    }

    public List<User> getUsers()
    {
        return users;
    }
    public User getUserByIndex(int userId)
    {
        for(User user : users)
        {
            if(user.getId() == userId)
                return user;
        }
        return null;
    }
    public boolean deleteUserById(int userId)
    {

        int userIndex = -1;

        for(User user : users)
        {
            if(user.getId() == userId)
            {
                userIndex = users.indexOf(user);
                break;
            }
        }

        if(userIndex > -1)
        {
            users.remove(userIndex);
        }
        else
        {
            return false;
        }
        return true;
    }

    public void addUser(User user)
    {
        users.add(user);

    }
}