/**
 * 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.broker.region.cursors;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.CombinationTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 */
public abstract class CursorSupport extends CombinationTestSupport {

   public int MESSAGE_COUNT = 500;
   public int PREFETCH_SIZE = 50;
   private static final Logger LOG = LoggerFactory.getLogger(CursorSupport.class);

   protected BrokerService broker;
   protected String bindAddress = "tcp://localhost:60706";

   protected abstract Destination getDestination(Session session) throws JMSException;

   protected abstract MessageConsumer getConsumer(Connection connection) throws Exception;

   protected abstract void configureBroker(BrokerService answer) throws Exception;

   public void testSendFirstThenConsume() throws Exception {
      ConnectionFactory factory = createConnectionFactory();
      Connection consumerConnection = getConsumerConnection(factory);
      MessageConsumer consumer = getConsumer(consumerConnection);
      consumerConnection.close();
      Connection producerConnection = factory.createConnection();
      producerConnection.start();
      Session session = producerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      MessageProducer producer = session.createProducer(getDestination(session));
      List<Message> senderList = new ArrayList<>();
      for (int i = 0; i < MESSAGE_COUNT; i++) {
         Message msg = session.createTextMessage("test" + i);
         senderList.add(msg);
         producer.send(msg);
      }
      producerConnection.close();
      // now consume the messages
      consumerConnection = getConsumerConnection(factory);
      // create durable subs
      consumer = getConsumer(consumerConnection);
      List<Message> consumerList = new ArrayList<>();
      for (int i = 0; i < MESSAGE_COUNT; i++) {
         Message msg = consumer.receive(1000 * 5);
         assertNotNull("Message " + i + " was missing.", msg);
         consumerList.add(msg);
      }
      assertEquals(senderList, consumerList);
      consumerConnection.close();
   }

   public void initCombosForTestSendWhilstConsume() {
      addCombinationValues("MESSAGE_COUNT", new Object[]{Integer.valueOf(400), Integer.valueOf(500)});
      addCombinationValues("PREFETCH_SIZE", new Object[]{Integer.valueOf(100), Integer.valueOf(50)});
   }

   public void testSendWhilstConsume() throws Exception {
      ConnectionFactory factory = createConnectionFactory();
      Connection consumerConnection = getConsumerConnection(factory);
      // create durable subs
      MessageConsumer consumer = getConsumer(consumerConnection);
      consumerConnection.close();
      Connection producerConnection = factory.createConnection();
      producerConnection.start();
      Session session = producerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      MessageProducer producer = session.createProducer(getDestination(session));
      List<TextMessage> senderList = new ArrayList<>();
      for (int i = 0; i < MESSAGE_COUNT / 10; i++) {
         TextMessage msg = session.createTextMessage("test" + i);
         senderList.add(msg);
         producer.send(msg);
      }
      // now consume the messages
      consumerConnection = getConsumerConnection(factory);
      // create durable subs
      consumer = getConsumer(consumerConnection);
      final List<Message> consumerList = new ArrayList<>();
      final CountDownLatch latch = new CountDownLatch(1);
      consumer.setMessageListener(new MessageListener() {

         @Override
         public void onMessage(Message msg) {
            try {
               // sleep to act as a slow consumer
               // which will force a mix of direct and polled dispatching
               // using the cursor on the broker
               Thread.sleep(50);
            } catch (Exception e) {
               e.printStackTrace();
            }
            consumerList.add(msg);
            if (consumerList.size() == MESSAGE_COUNT) {
               latch.countDown();
            }
         }
      });
      for (int i = MESSAGE_COUNT / 10; i < MESSAGE_COUNT; i++) {
         TextMessage msg = session.createTextMessage("test" + i);
         senderList.add(msg);
         producer.send(msg);
      }
      latch.await(300000, TimeUnit.MILLISECONDS);
      producerConnection.close();
      consumerConnection.close();
      assertEquals("Still dipatching - count down latch not sprung", latch.getCount(), 0);
      //assertEquals("cosumerList - expected: " + MESSAGE_COUNT + " but was: " + consumerList.size(), consumerList.size(), senderList.size());
      for (int i = 0; i < senderList.size(); i++) {
         Message sent = senderList.get(i);
         Message consumed = consumerList.get(i);
         if (!sent.equals(consumed)) {
            LOG.error("BAD MATCH AT POS " + i);
            LOG.error(sent.toString());
            LOG.error(consumed.toString());
                /*
                 * log.error("\n\n\n\n\n"); for (int j = 0; j <
                 * consumerList.size(); j++) { log.error(consumerList.get(j)); }
                 */
         }
         assertEquals("This should be the same at pos " + i + " in the list", sent.getJMSMessageID(), consumed.getJMSMessageID());
      }
   }

   protected Connection getConsumerConnection(ConnectionFactory fac) throws JMSException {
      Connection connection = fac.createConnection();
      connection.setClientID("testConsumer");
      connection.start();
      return connection;
   }

   @Override
   protected void setUp() throws Exception {
      if (broker == null) {
         broker = createBroker();
      }
      super.setUp();
   }

   @Override
   protected void tearDown() throws Exception {
      super.tearDown();
      if (broker != null) {
         broker.stop();
      }
   }

   protected ActiveMQConnectionFactory createConnectionFactory() throws Exception {
      ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory(bindAddress);
      Properties props = new Properties();
      props.setProperty("prefetchPolicy.durableTopicPrefetch", "" + PREFETCH_SIZE);
      props.setProperty("prefetchPolicy.optimizeDurableTopicPrefetch", "" + PREFETCH_SIZE);
      props.setProperty("prefetchPolicy.queuePrefetch", "" + PREFETCH_SIZE);
      cf.setProperties(props);
      return cf;
   }

   protected BrokerService createBroker() throws Exception {
      BrokerService answer = new BrokerService();
      configureBroker(answer);
      answer.start();
      return answer;
   }
}
