/**
 * 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.activemq.bugs;

import java.io.File;
import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.Message;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
import org.apache.activemq.util.ConsumerThread;
import org.apache.activemq.util.ProducerThread;
import org.apache.activemq.util.Wait;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class AMQ4323Test {

   private static final Logger LOG = LoggerFactory.getLogger(AMQ4323Test.class);

   BrokerService broker = null;
   File kahaDbDir = null;
   private final Destination destination = new ActiveMQQueue("q");
   final String payload = new String(new byte[1024]);

   protected void startBroker(boolean delete) throws Exception {
      broker = new BrokerService();

      //Start with a clean directory
      kahaDbDir = new File(broker.getBrokerDataDirectory(), "KahaDB");
      deleteDir(kahaDbDir);

      broker.setSchedulerSupport(false);
      broker.setDeleteAllMessagesOnStartup(delete);
      broker.setPersistent(true);
      broker.setUseJmx(false);
      broker.addConnector("tcp://localhost:0");

      PolicyMap map = new PolicyMap();
      PolicyEntry entry = new PolicyEntry();
      entry.setUseCache(false);
      map.setDefaultEntry(entry);
      broker.setDestinationPolicy(map);

      configurePersistence(broker, delete);

      broker.start();
      LOG.info("Starting broker..");
   }

   protected void configurePersistence(BrokerService brokerService, boolean deleteAllOnStart) throws Exception {
      KahaDBPersistenceAdapter adapter = (KahaDBPersistenceAdapter) brokerService.getPersistenceAdapter();

      // ensure there are a bunch of data files but multiple entries in each
      adapter.setJournalMaxFileLength(1024 * 20);

      // speed up the test case, checkpoint and cleanup early and often
      adapter.setCheckpointInterval(500);
      adapter.setCleanupInterval(500);

      if (!deleteAllOnStart) {
         adapter.setForceRecoverIndex(true);
      }

   }

   private boolean deleteDir(File dir) {
      if (dir.isDirectory()) {
         String[] children = dir.list();
         for (int i = 0; i < children.length; i++) {
            boolean success = deleteDir(new File(dir, children[i]));
            if (!success) {
               return false;
            }
         }
      }

      return dir.delete();
   }

   private int getFileCount(File dir) {
      if (dir.isDirectory()) {
         String[] children = dir.list();
         return children.length;
      }

      return 0;
   }

   @Test
   public void testCleanupOfFiles() throws Exception {
      final int messageCount = 500;
      startBroker(true);
      int fileCount = getFileCount(kahaDbDir);
      assertEquals(4, fileCount);

      Connection connection = new ActiveMQConnectionFactory(broker.getTransportConnectors().get(0).getConnectUri()).createConnection();
      connection.start();
      Session producerSess = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Session consumerSess = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

      ProducerThread producer = new ProducerThread(producerSess, destination) {
         @Override
         protected Message createMessage(int i) throws Exception {
            return sess.createTextMessage(payload + "::" + i);
         }
      };
      producer.setMessageCount(messageCount);
      ConsumerThread consumer = new ConsumerThread(consumerSess, destination);
      consumer.setBreakOnNull(false);
      consumer.setMessageCount(messageCount);

      producer.start();
      producer.join();

      consumer.start();
      consumer.join();

      assertEquals("consumer got all produced messages", producer.getMessageCount(), consumer.getReceived());

      // verify cleanup
      assertTrue("gc worked", Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            int fileCount = getFileCount(kahaDbDir);
            LOG.info("current filecount:" + fileCount);
            return 4 == fileCount;
         }
      }));

      broker.stop();
      broker.waitUntilStopped();

   }

}
