/*
 * This file is part of LibrePlan
 *
 * Copyright (C) 2009-2010 Fundación para o Fomento da Calidade Industrial e
 *                         Desenvolvemento Tecnolóxico de Galicia
 * Copyright (C) 2010-2011 Igalia, S.L.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.libreplan.business.users.daos;

import java.util.Collections;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;
import org.libreplan.business.common.daos.GenericDAOHibernate;
import org.libreplan.business.common.exceptions.InstanceNotFoundException;
import org.libreplan.business.common.exceptions.ValidationException;
import org.libreplan.business.users.entities.OrderAuthorization;
import org.libreplan.business.users.entities.Profile;
import org.libreplan.business.users.entities.ProfileOrderAuthorization;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

/**
 * Hibernate DAO for the <code>Profile</code> entity.
 *
 * @author Jacobo Aragunde Perez <jaragunde@igalia.com>
 * @author Diego Pino García <dpino@igalia.com>
 */
@Repository
public class ProfileDAO extends GenericDAOHibernate<Profile, Long> implements
        IProfileDAO {

    @Override
    public boolean existsByProfileName(String profileName) {
        try {
            findByProfileName(profileName);
            return true;
        }
        catch (InstanceNotFoundException e) {
            return false;
        }
    }

    @Override
    @Transactional(readOnly = true, propagation = Propagation.REQUIRES_NEW)
    public boolean existsByProfileNameAnotherTransaction(String profileName) {
        return existsByProfileName(profileName);
    }

    @Override
    @Transactional(readOnly = true)
    public Profile findByProfileName(String profileName)
        throws InstanceNotFoundException{

        Criteria c = getSession().createCriteria(Profile.class);
        c.add(Restrictions.eq("profileName", profileName).ignoreCase());
        Profile profile = (Profile) c.uniqueResult();

        if (profile == null) {
            throw new InstanceNotFoundException(profileName,
                Profile.class.getName());
        } else {
            return profile;
        }

    }

    @Override
    @Transactional(readOnly = true, propagation = Propagation.REQUIRES_NEW)
    public Profile findByProfileNameAnotherTransaction(String profileName)
            throws InstanceNotFoundException {
        return findByProfileName(profileName);
    }

    @Override
    public List<OrderAuthorization> getOrderAuthorizationsByProfile(Profile profile) {
        List orderAuthorizations = getSession()
                .createCriteria(ProfileOrderAuthorization.class)
                .add(Restrictions.eq("profile", profile)).list();
        return orderAuthorizations;
    }

    @Override
    public void checkHasUsers(Profile profile) throws ValidationException {
        // Query against a collection of elements
        // http://community.jboss.org/message/353859#353859
        Query query = getSession().createQuery(
                "FROM User user JOIN user.profiles up WHERE up IN (:profiles)");
        query.setParameterList("profiles", Collections.singleton(profile));
        if (!query.list().isEmpty()) {
            throw ValidationException
                    .invalidValueException(
                            "Cannot delete profile. It is being used at this moment by some users.",
                            profile);
        }
    }

    @Override
    @Transactional(readOnly = true)
    public Profile findByProfileNameLoadingRoles(String profileName)
            throws InstanceNotFoundException {
        Profile profile = findByProfileName(profileName);
        profile.getRoles().size();
        return profile;
    }

    @Override
    public List<Profile> listSorted() {
        Criteria c = getSession().createCriteria(Profile.class).addOrder(
                Order.asc("profileName"));
        return c.list();
    }

}