/**
 * 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.advisory;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;

import org.apache.activemq.EmbeddedBrokerTestSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 *
 */
public class ConsumerListenerTest extends EmbeddedBrokerTestSupport implements ConsumerListener {

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

   protected Session consumerSession1;
   protected Session consumerSession2;
   protected int consumerCounter;
   protected ConsumerEventSource consumerEventSource;
   protected BlockingQueue<ConsumerEvent> eventQueue = new ArrayBlockingQueue<>(1000);
   private Connection connection;

   public void testConsumerEvents() throws Exception {
      consumerEventSource.start();

      consumerSession1 = createConsumer();
      assertConsumerEvent(1, true);

      consumerSession2 = createConsumer();
      assertConsumerEvent(2, true);

      consumerSession1.close();
      consumerSession1 = null;
      assertConsumerEvent(1, false);

      consumerSession2.close();
      consumerSession2 = null;
      assertConsumerEvent(0, false);
   }

   public void testListenWhileAlreadyConsumersActive() throws Exception {
      consumerSession1 = createConsumer();
      consumerSession2 = createConsumer();

      consumerEventSource.start();
      assertConsumerEvent(2, true);
      assertConsumerEvent(2, true);

      consumerSession1.close();
      consumerSession1 = null;
      assertConsumerEvent(1, false);

      consumerSession2.close();
      consumerSession2 = null;
      assertConsumerEvent(0, false);
   }

   public void testConsumerEventsOnTemporaryDestination() throws Exception {

      Session s = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
      Destination dest = useTopic ? s.createTemporaryTopic() : s.createTemporaryQueue();
      consumerEventSource = new ConsumerEventSource(connection, dest);
      consumerEventSource.setConsumerListener(this);
      consumerEventSource.start();
      MessageConsumer consumer = s.createConsumer(dest);
      assertConsumerEvent(1, true);
      consumer.close();
      assertConsumerEvent(0, false);
   }

   @Override
   public void onConsumerEvent(ConsumerEvent event) {
      eventQueue.add(event);
   }

   @Override
   protected void setUp() throws Exception {
      super.setUp();

      connection = createConnection();
      connection.start();
      consumerEventSource = new ConsumerEventSource(connection, destination);
      consumerEventSource.setConsumerListener(this);
   }

   @Override
   protected void tearDown() throws Exception {
      if (consumerEventSource != null) {
         consumerEventSource.stop();
      }
      if (consumerSession2 != null) {
         consumerSession2.close();
      }
      if (consumerSession1 != null) {
         consumerSession1.close();
      }
      if (connection != null) {
         connection.close();
      }
      super.tearDown();
   }

   protected void assertConsumerEvent(int count, boolean started) throws InterruptedException {
      ConsumerEvent event = waitForConsumerEvent();
      assertEquals("Consumer count", count, event.getConsumerCount());
      assertEquals("started", started, event.isStarted());
   }

   protected Session createConsumer() throws JMSException {
      final String consumerText = "Consumer: " + (++consumerCounter);
      LOG.info("Creating consumer: " + consumerText + " on destination: " + destination);

      Session answer = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      MessageConsumer consumer = answer.createConsumer(destination);
      consumer.setMessageListener(new MessageListener() {
         @Override
         public void onMessage(Message message) {
            LOG.info("Received message by: " + consumerText + " message: " + message);
         }
      });
      return answer;
   }

   protected ConsumerEvent waitForConsumerEvent() throws InterruptedException {
      ConsumerEvent answer = eventQueue.poll(100000, TimeUnit.MILLISECONDS);
      assertTrue("Should have received a consumer event!", answer != null);
      return answer;
   }

}
