/*
 * NOTE: This copyright does *not* cover user programs that use HQ
 * program services by normal system calls through the application
 * program interfaces provided as part of the Hyperic Plug-in Development
 * Kit or the Hyperic Client Development Kit - this is merely considered
 * normal use of the program, and does *not* fall under the heading of
 * "derived work".
 *
 * Copyright (C) [2004-2007], Hyperic, Inc.
 * This file is part of HQ.
 *
 * HQ is free software; you can redistribute it and/or modify
 * it under the terms version 2 of the GNU General Public License as
 * published by the Free Software Foundation. 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 */

package org.hyperic.hq.common.server.session;

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

import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.hyperic.hibernate.PageInfo;
import org.hyperic.hq.authz.server.session.AuthzSubject;
import org.hyperic.hq.authz.server.session.Resource;
import org.hyperic.hq.authz.shared.AuthzConstants;
import org.hyperic.hq.dao.HibernateDAO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

@Repository
public class AuditDAO
    extends HibernateDAO<Audit> {
    @Autowired
    public AuditDAO(SessionFactory f) {
        super(Audit.class, f);
    }

    void handleResourceDelete(Resource r) {
        String sql = "update Audit a set " + "a.resource.id = :rootResource, "
                     + "a.original = false " + "where resource = :resource";

        getSession().createQuery(sql).setParameter("rootResource", AuthzConstants.rootResourceId)
            .setParameter("resource", r).executeUpdate();
    }

    void handleSubjectDelete(AuthzSubject s) {
        getSession().createQuery("delete Audit where subject = :subject")
            .setParameter("subject", s).executeUpdate();
    }

    List<Audit> find(PageInfo pInfo, AuthzSubject me, long startTime, long endTime,
                     AuditImportance minImportance, AuditPurpose purpose, AuthzSubject target,
                     String klazz) {
        AuditSortField sort = (AuditSortField) pInfo.getSort();
        String sql = "select a from Audit a " + "         join a.resource r "
                     + "         join a.subject s "
                     + "where a.importanceEnum >= :minImportance and "
                     + "      a.startTime >= :startTime and " + "      a.endTime   <  :endTime ";

        if (purpose != null)
            sql += " and a.purposeEnum = :purpose";

        if (klazz != null)
            sql += " and a.klazz = :klazz";

        if (target != null)
            sql += " and a.subject = :subject";

        sql += " order by " + sort.getSortString("a", "r", "s") +
               (pInfo.isAscending() ? "" : " DESC");

        if (!sort.equals(AuditSortField.START_TIME)) {
            sql += ", " + AuditSortField.START_TIME.getSortString("a", "r", "s") + " DESC";
        }

        Query q = getSession().createQuery(sql)
            .setInteger("minImportance", minImportance.getCode()).setLong("startTime", startTime)
            .setLong("endTime", endTime);

        if (purpose != null)
            q.setInteger("purposeEnum", purpose.getCode());

        if (klazz != null)
            q.setParameter("klazz", klazz);

        if (target != null)
            q.setParameter("subject", target);

        return pInfo.pageResults(q).list();
    }

    @SuppressWarnings("unchecked")
    public Collection<Audit> getOrphanedAudits() {
        final String hql = new StringBuilder(128)
            .append("from Audit a where not exists (")
            .append("select 1 from Resource r where a.resource = r")
            .append(")")
            .toString();
        return createQuery(hql).list();
    }
}