/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.richfaces.photoalbum.service;

import javax.ejb.Stateless;
import javax.inject.Inject;
import javax.persistence.EntityManager;

import org.richfaces.photoalbum.bean.UserBean;
import org.richfaces.photoalbum.domain.User;

/**
 * Class for manipulating with user entity. Analogous to DAO pattern. EJB3 Bean
 *
 * @author Andrey Markhel
 */

@Stateless
public class UserAction implements IUserAction {

    @Inject
    EntityManager em;

    @Inject
    UserBean userBean;

    //private User user;
    /**
     * Login user. If succes return logged user, otherwise return null
     *
     * @param username - username
     * @param password - password
     * @return user if success
     */
//    public User login(String username, String password) {
//        // new
//        User user = (User) em.createNamedQuery(Constants.USER_LOGIN_QUERY).setParameter(Constants.USERNAME_PARAMETER, username)
//            .setParameter(Constants.PASSWORD_PARAMETER, password).getSingleResult();
//        return user;
//    }

    /**
     * Persist user entity to database
     *
     * @param user - user to register
     * @throws PhotoAlbumException
     */
    public void register(User user) throws PhotoAlbumException {
        try {
            em.persist(user);
            em.flush();
        } catch (Exception e) {
            throw new PhotoAlbumException(e.getMessage());
        }
    }

    /**
     * Synchronize state of user entity with database
     *
     * @return user if success
     * @throws PhotoAlbumException
     */
    public User updateUser() throws PhotoAlbumException {
        try {
            em.merge(userBean.getUser());
            em.flush();
        } catch (Exception e) {
            throw new PhotoAlbumException(e.getMessage());
        }
        return userBean.getUser();
    }

    /**
     * Refresh state of user entity with database
     *
     * @Param user - user to refresh
     * @return user if success
     * @throws PhotoAlbumException
     */
    public User refreshUser() {
        User user = em.find(User.class, userBean.getUser().getId());
        em.refresh(user);
        return user;
    }

    /**
     * Check if user with specified login already exist
     *
     * @return is user with specified login already exist
     */
    public boolean isUserExist(String login) {
        return em.createNamedQuery(Constants.USER_EXIST_QUERY).setParameter(Constants.LOGIN_PARAMETER, login).getResultList()
            .size() != 0;
    }

    /**
     * Check if user with specified email already exist
     *
     * @return is user with specified email already exist
     */
    public boolean isEmailExist(String email) {
        return em.createNamedQuery(Constants.EMAIL_EXIST_QUERY).setParameter(Constants.EMAIL_PARAMETER, email).getResultList()
            .size() != 0;
    }
}