package com.ufund.api.ufundapi.service;

import java.io.IOException;

import org.springframework.stereotype.Component;

import com.ufund.api.ufundapi.DuplicateKeyException;
import com.ufund.api.ufundapi.model.User;
import com.ufund.api.ufundapi.persistence.UserDAO;

@Component
public class UserService {

    private final UserDAO userDAO;
    final CupboardService cupboardService;

    public UserService(UserDAO userDao, CupboardService cupboardService) {
        this.userDAO = userDao;
        this.cupboardService = cupboardService;
    }

    /**
     * Creates a new user
     *
     * @param username The username of the user
     * @param password The password of the user
     * @return The created user object
     * @throws IOException Thrown on any problem saving the file
     */
    public User createUser(String username, String password) throws IOException, DuplicateKeyException {
        if (userDAO.getUser(username) != null) {
            throw new DuplicateKeyException("A user with this name already exists");
        }
        User user = User.create(username, password);
        return userDAO.addUser(user);
    }

    /**
     * Gets a user with the given username
     *
     * @param username The username of the user
     * @return The user object with that username
     * @throws IOException If there was any problem saving the file
     */
    public User getUser(String username) throws IOException {
        User user = userDAO.getUser(username);
        if (user == null) {
            return null;
        }
        for (int needId : user.getBasket()) {
            if (cupboardService.getNeed(needId) == null) {
                user.removeBasketNeed(needId);
            }
        }
        return userDAO.getUser(username);
    }

    /**
     * Updates a user
     *
     * @param user     The ID of the user to update
     * @param username The user object to set (note: the ID is ignored)
     * @return The updated user object
     * @throws IOException Thrown if there was any issue saving the data
     */
    public User updateUser(User user, String username) throws IOException {
        if (!user.getUsername().equals(username)) {
            throw new IllegalArgumentException("ID in URL and body must match");
        }
        return userDAO.updateUser(user);
    }

    /**
     * Deletes a user
     *
     * @param username The username of the user to delete
     * @return True if the user was deleted
     * @throws IOException Thrown if there was any issue saving the data
     */
    public boolean deleteUser(String username) throws IOException {
        return userDAO.deleteUser(username);
    }

}