/**
 * 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.usecases;

import javax.jms.Connection;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import junit.framework.Test;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.store.PersistenceAdapter;
import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
import org.apache.activemq.store.kahadb.KahaDBStore;
import org.apache.activemq.util.Wait;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DurableSubsOfflineSelectorConcurrentConsumeIndexUseTest extends org.apache.activemq.TestSupport {

   private static final Logger LOG = LoggerFactory.getLogger(DurableSubsOfflineSelectorConcurrentConsumeIndexUseTest.class);
   public int messageCount = 10000;
   private BrokerService broker;
   private ActiveMQTopic topic;
   private final List<Throwable> exceptions = new ArrayList<>();

   @Override
   protected ActiveMQConnectionFactory createConnectionFactory() throws Exception {
      ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("vm://" + getName(true));
      connectionFactory.setWatchTopicAdvisories(false);
      return connectionFactory;
   }

   @Override
   protected Connection createConnection() throws Exception {
      return createConnection("id");
   }

   protected Connection createConnection(String name) throws Exception {
      Connection con = getConnectionFactory().createConnection();
      con.setClientID(name);
      con.start();
      return con;
   }

   public static Test suite() {
      return suite(DurableSubsOfflineSelectorConcurrentConsumeIndexUseTest.class);
   }

   @Override
   protected void setUp() throws Exception {
      exceptions.clear();
      topic = (ActiveMQTopic) createDestination();
      createBroker();
      super.setUp();
   }

   @Override
   protected void tearDown() throws Exception {
      super.tearDown();
      destroyBroker();
   }

   private void createBroker() throws Exception {
      createBroker(true);
   }

   private void createBroker(boolean deleteAllMessages) throws Exception {
      broker = BrokerFactory.createBroker("broker:(vm://" + getName(true) + ")");
      broker.setBrokerName(getName(true));
      broker.setDeleteAllMessagesOnStartup(deleteAllMessages);
      broker.getManagementContext().setCreateConnector(false);
      broker.setAdvisorySupport(false);
      broker.addConnector("tcp://0.0.0.0:0");

      setDefaultPersistenceAdapter(broker);

      ((KahaDBPersistenceAdapter) broker.getPersistenceAdapter()).getStore().getPageFile().setPageSize(1024);

      broker.start();
   }

   private void destroyBroker() throws Exception {
      if (broker != null)
         broker.stop();
   }

   public void testIndexPageUsage() throws Exception {
      Connection con = createConnection();
      Session session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
      session.createDurableSubscriber(topic, "true", "filter = 'true'", true);
      session.close();

      session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
      session.createDurableSubscriber(topic, "false", "filter = 'false'", true);
      session.close();

      session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
      session.createDurableSubscriber(topic, "all", null, true);
      session.close();

      session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
      session.createDurableSubscriber(topic, "all2", null, true);
      session.close();

      con.close();

      // send messages

      final CountDownLatch goOn = new CountDownLatch(1);
      Thread sendThread = new Thread() {
         @Override
         public void run() {
            try {

               final Connection sendCon = createConnection("send");
               final Session sendSession = sendCon.createSession(false, Session.AUTO_ACKNOWLEDGE);
               final MessageProducer producer = sendSession.createProducer(null);

               for (int i = 0; i < messageCount; i++) {
                  boolean filter = i % 2 == 1;
                  Message message = sendSession.createMessage();
                  message.setStringProperty("filter", filter ? "true" : "false");
                  producer.send(topic, message);

                  if (i > 0 && i % 10000 == 0) {
                     LOG.info("Sent:" + i);
                  }
                  if (i > messageCount / 2) {
                     goOn.countDown();
                  }
               }
               sendSession.close();
               sendCon.close();
            } catch (Exception e) {
               exceptions.add(e);
            }
         }
      };
      sendThread.start();

      goOn.await(5, TimeUnit.MINUTES);
      LOG.info("Activating consumers");

      // consume messages in parallel
      con = createConnection();
      session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);

      MessageConsumer consumerTrue = session.createDurableSubscriber(topic, "true", "filter = 'true'", true);
      Listener listenerT = new Listener();
      consumerTrue.setMessageListener(listenerT);

      MessageConsumer consumerFalse = session.createDurableSubscriber(topic, "false", "filter = 'false'", true);
      Listener listenerF = new Listener();
      consumerFalse.setMessageListener(listenerF);

      MessageConsumer consumerAll = session.createDurableSubscriber(topic, "all", null, true);
      Listener listenerA = new Listener();
      consumerAll.setMessageListener(listenerA);

      MessageConsumer consumerAll2 = session.createDurableSubscriber(topic, "all2", null, true);
      Listener listenerA2 = new Listener();
      consumerAll2.setMessageListener(listenerA2);

      waitFor(listenerA, messageCount);
      assertEquals(messageCount, listenerA.count);

      waitFor(listenerA2, messageCount);
      assertEquals(messageCount, listenerA2.count);

      assertEquals(messageCount / 2, listenerT.count);
      assertEquals(messageCount / 2, listenerF.count);

      consumerTrue.close();
      session.unsubscribe("true");

      consumerFalse.close();
      session.unsubscribe("false");

      consumerAll.close();
      session.unsubscribe("all");

      session.close();
      con.close();

      PersistenceAdapter persistenceAdapter = broker.getPersistenceAdapter();
      if (persistenceAdapter instanceof KahaDBPersistenceAdapter) {
         final KahaDBStore store = ((KahaDBPersistenceAdapter) persistenceAdapter).getStore();
         LOG.info("Store page count: " + store.getPageFile().getPageCount());
         LOG.info("Store free page count: " + store.getPageFile().getFreePageCount());
         LOG.info("Store page in-use: " + (store.getPageFile().getPageCount() - store.getPageFile().getFreePageCount()));

         assertTrue("no leak of pages, always use just 11", Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
               return 11 == store.getPageFile().getPageCount() - store.getPageFile().getFreePageCount();
            }
         }, TimeUnit.SECONDS.toMillis(10)));
      }
   }

   private void waitFor(final Listener listener, final int count) throws Exception {

      assertTrue("got all messages on time", Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return listener.count == count;
         }
      }, TimeUnit.MINUTES.toMillis(10)));

   }

   public static class Listener implements MessageListener {

      int count = 0;
      String id = null;

      Listener() {
      }

      @Override
      public void onMessage(Message message) {
         count++;
         if (id != null) {
            try {
               LOG.info(id + ", " + message.getJMSMessageID());
            } catch (Exception ignored) {
            }
         }
      }
   }
}
