/**
 * Copyright (C) 2011  JTalks.org Team
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jtalks.jcommune.model.dao.hibernate;

import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.jtalks.common.model.dao.hibernate.GenericDao;
import org.jtalks.common.model.entity.User;
import org.jtalks.jcommune.model.dao.UserDao;
import org.jtalks.jcommune.model.dao.utils.SqlLikeEscaper;
import org.jtalks.jcommune.model.entity.JCUser;

import java.util.Collection;
import java.util.List;
import java.util.Set;

/**
 * Hibernate implementation of UserDao.
 * Mainly intended for queering users from DB based on different criteria.
 *
 * @author Pavel Vervenko
 * @author Evgeniy Naumenko
 * @author Kirill Afonin
 * @author Anuar_Nurmakanov
 */
public class UserHibernateDao extends GenericDao<JCUser>
        implements UserDao {

    /**
     * @param sessionFactory The SessionFactory.
     */
    public UserHibernateDao(SessionFactory sessionFactory) {
        super(sessionFactory, JCUser.class);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public User getCommonUserByUsername(String username) {
        return (User) session().getNamedQuery("getCommonUserByUsername")
                .setString("username", username).uniqueResult();
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    @Override
    public JCUser getByUsername(String username) {
        List<JCUser> users = session().createCriteria(JCUser.class)
                .add(Restrictions.eq("username", username).ignoreCase()).list();
        if (users.size() == 1) {
            return users.get(0);
        } else {
            //see JavaDocs to get understanding on when this situation can happen
            for (JCUser user : users) {
                if (user.getUsername().equals(username)) {
                    return user;
                }
            }
            return null;
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public JCUser getByEmail(String email) {
        return (JCUser) session().createCriteria(JCUser.class)
                .add(Restrictions.eq("email", email))
                .uniqueResult();
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    @Override
    public Collection<JCUser> getNonActivatedUsers() {
        return session().createCriteria(JCUser.class)
                .add(Restrictions.eq("enabled", false))
                .list();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public JCUser getByUuid(String uuid) {
        return (JCUser) session().createCriteria(JCUser.class)
                .add(Restrictions.eq("uuid", uuid))
                .uniqueResult();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public List<JCUser> getByUsernames(Set<String> usernames) {
        //noinspection unchecked
        return (List<JCUser>) session().getNamedQuery("getByUsernames")
                .setParameterList("usernames", usernames)
                .list();
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    @Override
    public List<String> getUsernames(String pattern, int count) {
        pattern = SqlLikeEscaper.escapeControlCharacters(pattern);
        return session().getNamedQuery("getEnabledUsersNames")
                .setParameter("pattern", "%" + pattern.toLowerCase() + "%")
                .setMaxResults(count)
                .list();
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<JCUser> findByUsernameOrEmail(String pattern, int count) {
        pattern = SqlLikeEscaper.escapeControlCharacters(pattern);
        return session().getNamedQuery("searchByEmailOrUsername")
                .setParameter("pattern", "%" + pattern.toLowerCase() + "%")
                .setParameter("exactMatch", pattern.toLowerCase())
                .setParameter("primaryPattern", pattern.toLowerCase() + "%")
                .setParameter("secondaryPattern", "%" + pattern.toLowerCase() + "%")
                .setParameter("thirdaryPattern", "%" + pattern.toLowerCase())
                .setMaxResults(count)
                .list();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public JCUser loadById(Long id) {
        return (JCUser) session().load(JCUser.class, id);
    }
}