/*
 * Copyright 2011 Red Hat Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.drools.persistence.map.impl;

import static org.drools.persistence.util.PersistenceUtil.*;

import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.base.MapGlobalResolver;
import org.drools.persistence.jpa.JPAKnowledgeService;
import org.drools.persistence.jpa.marshaller.JPAPlaceholderResolverStrategy;
import org.drools.persistence.jta.JtaTransactionManager;
import org.drools.runtime.Environment;
import org.drools.runtime.EnvironmentName;
import org.drools.runtime.StatefulKnowledgeSession;
import org.junit.After;
import org.junit.Before;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import bitronix.tm.TransactionManagerServices;
import bitronix.tm.resource.jdbc.PoolingDataSource;

public class JpaBasedPersistenceTest extends MapPersistenceTest {

    private static Logger logger = LoggerFactory.getLogger(JPAPlaceholderResolverStrategy.class);
    
    private  PoolingDataSource ds1;
    private EntityManagerFactory emf;
    private JtaTransactionManager txm;
    private boolean useTransactions = false;
    
    @Before
    public void setUp() throws Exception {
        ds1 = setupPoolingDataSource();
        
        ds1.init();
        emf = Persistence.createEntityManagerFactory( DROOLS_PERSISTENCE_UNIT_NAME );
        if( useTransactions() ) { 
            useTransactions = true;
            Environment env = createEnvironment();
            Object tm = env.get( EnvironmentName.TRANSACTION_MANAGER );
            this.txm = new JtaTransactionManager( env.get( EnvironmentName.TRANSACTION ),
                env.get( EnvironmentName.TRANSACTION_SYNCHRONIZATION_REGISTRY ),
                tm ); 
        }
    }
    
    @After
    public void tearDown() throws Exception {
        emf.close();
        ds1.close();
    }
    
    @Override
    protected StatefulKnowledgeSession createSession(KnowledgeBase kbase) {
        return JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, createEnvironment() );
    }

    @Override
    protected StatefulKnowledgeSession disposeAndReloadSession(StatefulKnowledgeSession ksession,
                                                               KnowledgeBase kbase) {
        int ksessionId = ksession.getId();
        ksession.dispose();
        return JPAKnowledgeService.loadStatefulKnowledgeSession( ksessionId, kbase, null, createEnvironment() );
    }

    @Override
    protected long getSavedSessionsCount() {
        logger.info("quering number of saved sessions.");
        boolean transactionOwner = false;
        if( useTransactions ) { 
            transactionOwner = txm.begin();
        }
        long savedSessionsCount =  emf.createEntityManager().createQuery( "FROM SessionInfo" ).getResultList().size();
        if( useTransactions ) { 
            txm.commit(transactionOwner);
        }
        return savedSessionsCount;
    }

    private Environment createEnvironment(){
        Environment env = KnowledgeBaseFactory.newEnvironment();
        env.set( EnvironmentName.ENTITY_MANAGER_FACTORY,
                 emf );
        env.set( EnvironmentName.TRANSACTION_MANAGER,
                 TransactionManagerServices.getTransactionManager() );
        env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );
        
        return env;
    }
}