/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.qpid.server.store.berkeleydb;

import java.io.File;
import java.util.Map;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.Session;

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

import org.apache.qpid.server.model.VirtualHostNode;
import org.apache.qpid.server.virtualhostnode.berkeleydb.BDBVirtualHostNode;
import org.apache.qpid.test.utils.QpidBrokerTestCase;
import org.apache.qpid.util.FileUtils;
import org.apache.qpid.util.Strings;

/**
 * Tests the BDB backup can successfully perform a backup and that
 * backup can be restored and used by the Broker.
 */
public class BDBBackupTest extends QpidBrokerTestCase
{
    protected static final Logger LOGGER = LoggerFactory.getLogger(BDBBackupTest.class);

    private static final String TEST_VHOST = "test";
    private static final String SYSTEM_TMP_DIR = System.getProperty("java.io.tmpdir");

    private File _backupToDir;
    private File _backupFromDir;

    @Override
    public void setUp() throws Exception
    {
        super.setUp();
        _backupToDir = new File(SYSTEM_TMP_DIR + File.separator + getTestName());
        _backupToDir.mkdirs();

        Map<String, Object> virtualHostNodeAttributes = getDefaultBrokerConfiguration().getObjectAttributes(VirtualHostNode.class, TEST_VHOST);
        setSystemProperty("qpid.work_dir", getDefaultBroker().getWorkDir().toString());
        _backupFromDir = new File(Strings.expand((String) virtualHostNodeAttributes.get(BDBVirtualHostNode.STORE_PATH)));
        boolean fromDirExistsAndIsDir = _backupFromDir.isDirectory();
        assertTrue("backupFromDir " + _backupFromDir + " should already exist", fromDirExistsAndIsDir);
    }

    @Override
    public void tearDown() throws Exception
    {
        try
        {
            super.tearDown();
        }
        finally
        {
            FileUtils.delete(_backupToDir, true);
        }
    }

    public void testBackupAndRestoreMaintainsMessages() throws Exception
    {
        sendNumberedMessages(0, 10);
        invokeBdbBackup(_backupFromDir, _backupToDir);
        sendNumberedMessages(10, 20);
        confirmBrokerHasMessages(0, 20);
        stopDefaultBroker();

        deleteStore(_backupFromDir);
        replaceStoreWithBackup(_backupToDir, _backupFromDir);

        startDefaultBroker();
        confirmBrokerHasMessages(0, 10);
    }

    private void sendNumberedMessages(final int startIndex, final int endIndex) throws JMSException, Exception
    {
        Connection con = getConnection();
        Session session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Destination destination = createTestQueue(session);

        final int numOfMessages = endIndex - startIndex;
        final int batchSize = 0;
        sendMessage(session, destination, numOfMessages, startIndex, batchSize);
        con.close();
    }

    private void confirmBrokerHasMessages(final int startIndex, final int endIndex) throws Exception
    {
        Connection con = getConnection();
        Session session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
        con.start();
        Destination destination = session.createQueue(getTestQueueName());
        MessageConsumer consumer = session.createConsumer(destination);
        for (int i = startIndex; i < endIndex; i++)
        {
            Message msg = consumer.receive(RECEIVE_TIMEOUT);
            assertNotNull("Message " + i + " not received", msg);
            assertEquals("Did not receive the expected message", i, msg.getIntProperty(INDEX));
        }

        Message msg = consumer.receive(100);
        if(msg != null)
        {
            fail("No more messages should be received, but received additional message with index: " + msg.getIntProperty(INDEX));
        }
        con.close();
    }

    private void invokeBdbBackup(final File backupFromDir, final File backupToDir) throws Exception
    {
        BDBBackup.main(new String[]{"-todir", backupToDir.getAbsolutePath(), "-fromdir", backupFromDir.getAbsolutePath()});
    }

    private void replaceStoreWithBackup(File source, File dst) throws Exception
    {
        LOGGER.debug("Copying store " + source  + " to " + dst);
        FileUtils.copyRecursive(source, dst);
    }

    private void deleteStore(File storeDir)
    {
        LOGGER.debug("Deleting store " + storeDir);
        FileUtils.delete(storeDir, true);
    }

}