/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.testing.tm;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.LinkedList;
import javax.transaction.HeuristicMixedException;
import javax.transaction.HeuristicRollbackException;
import javax.transaction.RollbackException;
import javax.transaction.Status;
import javax.transaction.Synchronization;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import javax.transaction.xa.XAResource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * SimpleJtaTransactionImpl implementation
 *
 * @author Steve Ebersole
 */
public class SimpleJtaTransactionImpl implements Transaction {
	private static final Logger log = LoggerFactory.getLogger( SimpleJtaTransactionImpl.class );

	private int status;
	private LinkedList synchronizations;
	private Connection connection; // the only resource we care about is jdbc connection
	private final SimpleJtaTransactionManagerImpl jtaTransactionManager;

	public SimpleJtaTransactionImpl(SimpleJtaTransactionManagerImpl jtaTransactionManager) {
		this.jtaTransactionManager = jtaTransactionManager;
		this.status = Status.STATUS_ACTIVE;
	}

	public int getStatus() {
		return status;
	}

	public void commit()
			throws RollbackException, HeuristicMixedException, HeuristicRollbackException, IllegalStateException, SystemException {

		if ( status == Status.STATUS_MARKED_ROLLBACK ) {
			log.trace( "on commit, status was marked for rollback-only" );
			rollback();
		}
		else {
			status = Status.STATUS_PREPARING;

			for ( int i = 0; i < synchronizations.size(); i++ ) {
				Synchronization s = ( Synchronization ) synchronizations.get( i );
				s.beforeCompletion();
			}

			status = Status.STATUS_COMMITTING;

			if ( connection != null ) {
				try {
					connection.commit();
					connection.close();
				}
				catch ( SQLException sqle ) {
					status = Status.STATUS_UNKNOWN;
					throw new SystemException();
				}
			}

			status = Status.STATUS_COMMITTED;

			for ( int i = 0; i < synchronizations.size(); i++ ) {
				Synchronization s = ( Synchronization ) synchronizations.get( i );
				s.afterCompletion( status );
			}

			//status = Status.STATUS_NO_TRANSACTION;
			jtaTransactionManager.endCurrent( this );
		}
	}

	public void rollback() throws IllegalStateException, SystemException {
		status = Status.STATUS_ROLLEDBACK;

		if ( connection != null ) {
			try {
				connection.rollback();
				connection.close();
			}
			catch ( SQLException sqle ) {
				status = Status.STATUS_UNKNOWN;
				throw new SystemException();
			}
		}

		for ( int i = 0; i < synchronizations.size(); i++ ) {
			Synchronization s = ( Synchronization ) synchronizations.get( i );
			s.afterCompletion( status );
		}

		//status = Status.STATUS_NO_TRANSACTION;
		jtaTransactionManager.endCurrent( this );
	}

	public void setRollbackOnly() throws IllegalStateException, SystemException {
		status = Status.STATUS_MARKED_ROLLBACK;
	}

	public void registerSynchronization(Synchronization synchronization)
			throws RollbackException, IllegalStateException, SystemException {
		// todo : find the spec-allowable statuses during which synch can be registered...
		if ( synchronizations == null ) {
			synchronizations = new LinkedList();
		}
		synchronizations.add( synchronization );
	}

	public void enlistConnection(Connection connection) {
		if ( this.connection != null ) {
			throw new IllegalStateException( "Connection already registered" );
		}
		this.connection = connection;
	}

	public Connection getEnlistedConnection() {
		return connection;
	}


	public boolean enlistResource(XAResource xaResource)
			throws RollbackException, IllegalStateException, SystemException {
		return false;
	}

	public boolean delistResource(XAResource xaResource, int i) throws IllegalStateException, SystemException {
		return false;
	}
}
