/**
 * Abiquo community edition
 * cloud management application for hybrid clouds
 * Copyright (C) 2008-2010 - Abiquo Holdings S.L.
 *
 * This application 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 under
 * version 3 of the License
 *
 * 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 v.3 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package com.abiquo.server.core.statistics;

import java.util.Arrays;
import java.util.Collection;

import javax.persistence.EntityManager;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.Transformer;
import org.apache.commons.lang.StringUtils;
import org.hibernate.Criteria;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;
import org.springframework.stereotype.Repository;

import com.abiquo.server.core.common.persistence.DefaultDAOBase;
import com.abiquo.server.core.enterprise.User;

@Repository("jpaVirtualDatacenterResourcesDAO")
public class VirtualDatacenterResourcesDAO extends
    DefaultDAOBase<Integer, VirtualDatacenterResources>
{
    public VirtualDatacenterResourcesDAO()
    {
        super(VirtualDatacenterResources.class);
    }

    public VirtualDatacenterResourcesDAO(EntityManager entityManager)
    {
        super(VirtualDatacenterResources.class, entityManager);
    }

    public Collection<VirtualDatacenterResources> findByIdEnterprise(Integer idEnterprise, User user)
    {

        Criteria criteria = createCriteria(sameIdEnterprise(idEnterprise));
        criteria.addOrder(Order.asc(VirtualDatacenterResources.VDC_NAME_PROPERTY));

        if (user != null && !StringUtils.isEmpty(user.getAvailableVirtualDatacenters()))
        {
            criteria.add(availableToUser(user));
        }

        return criteria.list();
    }

    public static Criterion sameIdEnterprise(Integer idEnterprise)
    {
        return Restrictions.eq(VirtualDatacenterResources.ID_ENTERPRISE_PROPERTY, idEnterprise);
    }

    private static Criterion availableToUser(User user)
    {
        Collection<String> idsStrings =
            Arrays.asList(user.getAvailableVirtualDatacenters().split(","));

        Collection<Integer> ids = CollectionUtils.collect(idsStrings, new Transformer()
        {
            @Override
            public Object transform(Object input)
            {
                return Integer.valueOf(input.toString());
            }
        });

        return Restrictions.in(VirtualDatacenterResources.ID_PROPERTY, ids);
    }

}