/*
 * 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;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.TopicSubscriber;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.activemq.broker.BrokerFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.util.MessageIdList;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.rules.TestName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.junit.Assert.assertEquals;

/**
 * Test case support used to test multiple message comsumers and message
 * producers connecting to a single broker.
 */
public class JmsMultipleClientsTestSupport {

   @Rule
   public TestName testName = new TestName();

   protected static final Logger LOG = LoggerFactory.getLogger(JmsMultipleClientsTestSupport.class);

   protected Map<MessageConsumer, MessageIdList> consumers = new HashMap<>(); // Map of consumer with messages
   // received
   protected int consumerCount = 1;
   protected int producerCount = 1;

   protected int messageSize = 1024;

   protected boolean useConcurrentSend = true;
   protected boolean autoFail = true;
   protected boolean durable;
   public boolean topic;
   protected boolean persistent;

   protected BrokerService broker;
   protected Destination destination;
   protected List<Connection> connections = Collections.synchronizedList(new ArrayList<>());
   protected MessageIdList allMessagesList = new MessageIdList();

   protected void startProducers(Destination dest, int msgCount) throws Exception {
      startProducers(createConnectionFactory(), dest, msgCount);
   }

   protected void startProducers(final ConnectionFactory factory,
                                 final Destination dest,
                                 final int msgCount) throws Exception {
      // Use concurrent send
      if (useConcurrentSend) {
         final AtomicInteger producerLock = new AtomicInteger(producerCount);

         for (int i = 0; i < producerCount; i++) {
            Thread t = new Thread(() -> {
               try {
                  sendMessages(factory.createConnection(), dest, msgCount);
               } catch (Exception e) {
                  e.printStackTrace();
               }

               synchronized (producerLock) {
                  producerLock.decrementAndGet();
                  producerLock.notifyAll();
               }
            });

            t.start();
         }

         // Wait for all producers to finish sending
         synchronized (producerLock) {
            while (producerLock.get() != 0) {
               producerLock.wait(2000);
            }
         }

         // Use serialized send
      } else {
         for (int i = 0; i < producerCount; i++) {
            sendMessages(factory.createConnection(), dest, msgCount);
         }
      }
   }

   protected void sendMessages(Connection connection, Destination destination, int count) throws Exception {
      connections.add(connection);
      connection.start();

      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      MessageProducer producer = session.createProducer(destination);
      producer.setDeliveryMode(persistent ? DeliveryMode.PERSISTENT : DeliveryMode.NON_PERSISTENT);

      for (int i = 0; i < count; i++) {
         TextMessage msg = createTextMessage(session, "" + i);
         producer.send(msg);
      }

      producer.close();
      session.close();
      connection.close();
   }

   protected TextMessage createTextMessage(Session session, String initText) throws Exception {
      TextMessage msg = session.createTextMessage();

      // Pad message text
      if (initText.length() < messageSize) {
         char[] data = new char[messageSize - initText.length()];
         Arrays.fill(data, '*');
         String str = new String(data);
         msg.setText(initText + str);

         // Do not pad message text
      } else {
         msg.setText(initText);
      }

      return msg;
   }

   protected void startConsumers(Destination dest) throws Exception {
      startConsumers(createConnectionFactory(), dest);
   }

   protected void startConsumers(ConnectionFactory factory, Destination dest) throws Exception {
      MessageConsumer consumer;
      for (int i = 0; i < consumerCount; i++) {
         if (durable && topic) {
            consumer = createDurableSubscriber(factory.createConnection(), dest, "consumer" + (i + 1));
         } else {
            consumer = createMessageConsumer(factory.createConnection(), dest);
         }
         MessageIdList list = new MessageIdList();
         list.setParent(allMessagesList);
         consumer.setMessageListener(list);
         consumers.put(consumer, list);
      }
   }

   protected MessageConsumer createMessageConsumer(Connection conn, Destination dest) throws Exception {
      connections.add(conn);

      Session sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
      final MessageConsumer consumer = sess.createConsumer(dest);
      conn.start();

      return consumer;
   }

   protected TopicSubscriber createDurableSubscriber(Connection conn, Destination dest, String name) throws Exception {
      conn.setClientID(name);
      connections.add(conn);
      conn.start();

      Session sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
      final TopicSubscriber consumer = sess.createDurableSubscriber((javax.jms.Topic) dest, name);

      return consumer;
   }

   protected void waitForAllMessagesToBeReceived(int messageCount) throws Exception {
      allMessagesList.waitForMessagesToArrive(messageCount);
   }

   protected ActiveMQDestination createDestination() throws JMSException {
      String name = "." + getClass().getName() + "." + getName();
      // ensure not inadvertently composite because of combos
      name = name.replace(' ', '_');
      name = name.replace(',', '&');
      if (topic) {
         destination = new ActiveMQTopic("Topic" + name);
         return (ActiveMQDestination) destination;
      } else {
         destination = new ActiveMQQueue("Queue" + name);
         return (ActiveMQDestination) destination;
      }
   }

   protected ConnectionFactory createConnectionFactory() throws Exception {
      return new ActiveMQConnectionFactory("vm://localhost");
   }

   protected BrokerService createBroker() throws Exception {
      return BrokerFactory.createBroker(new URI("broker://()/localhost?persistent=false&useJmx=true"));
   }

   @Before
   public void setUp() throws Exception {
      broker = createBroker();
      broker.start();
   }

   @After
   public void tearDown() throws Exception {
      for (Iterator<Connection> iter = connections.iterator(); iter.hasNext(); ) {
         Connection conn = iter.next();
         try {
            conn.close();
         } catch (Throwable e) {
         }
      }
      if (broker != null) { // FIXME remove
         broker.stop();
         allMessagesList.flushMessages();
         consumers.clear();
      }
   }

   /*
    * Some helpful assertions for multiple consumers.
    */
   protected void assertConsumerReceivedAtLeastXMessages(MessageConsumer consumer, int msgCount) {
      MessageIdList messageIdList = consumers.get(consumer);
      messageIdList.assertAtLeastMessagesReceived(msgCount);
   }

   protected void assertConsumerReceivedAtMostXMessages(MessageConsumer consumer, int msgCount) {
      MessageIdList messageIdList = consumers.get(consumer);
      messageIdList.assertAtMostMessagesReceived(msgCount);
   }

   protected void assertConsumerReceivedXMessages(MessageConsumer consumer, int msgCount) {
      MessageIdList messageIdList = consumers.get(consumer);
      messageIdList.assertMessagesReceivedNoWait(msgCount);
   }

   protected void assertEachConsumerReceivedAtLeastXMessages(int msgCount) {
      for (Iterator<MessageConsumer> i = consumers.keySet().iterator(); i.hasNext(); ) {
         assertConsumerReceivedAtLeastXMessages(i.next(), msgCount);
      }
   }

   protected void assertEachConsumerReceivedAtMostXMessages(int msgCount) {
      for (Iterator<MessageConsumer> i = consumers.keySet().iterator(); i.hasNext(); ) {
         assertConsumerReceivedAtMostXMessages(i.next(), msgCount);
      }
   }

   protected void assertEachConsumerReceivedXMessages(int msgCount) {
      for (Iterator<MessageConsumer> i = consumers.keySet().iterator(); i.hasNext(); ) {
         assertConsumerReceivedXMessages(i.next(), msgCount);
      }
   }

   protected void assertTotalMessagesReceived(int msgCount) {
      allMessagesList.assertMessagesReceivedNoWait(msgCount);

      // now lets count the individual messages received
      int totalMsg = 0;
      for (Iterator<MessageConsumer> i = consumers.keySet().iterator(); i.hasNext(); ) {
         MessageIdList messageIdList = consumers.get(i.next());
         totalMsg += messageIdList.getMessageCount();
      }
      assertEquals("Total of consumers message count", msgCount, totalMsg);
   }

   public String getName() {
      return getName(false);
   }

   public String getName(boolean original) {
      String currentTestName = testName.getMethodName();
      currentTestName = currentTestName.replace("[", "");
      currentTestName = currentTestName.replace("]", "");
      return currentTestName;
   }

   public void assertDestinationMemoryUsageGoesToZero() throws Exception {
      assertEquals("destination memory is back to 0", 0, TestSupport.getDestination(broker, ActiveMQDestination.transform(destination)).getMemoryUsage().getPercentUsage());
   }

   /*
    * This is copied from AutoFailTestSupport.  We may want to move it to someplace where more
    * tests can use it.
    */
   public static void dumpAllThreads(String prefix) {
      Map<Thread, StackTraceElement[]> stacks = Thread.getAllStackTraces();
      for (Map.Entry<Thread, StackTraceElement[]> stackEntry : stacks.entrySet()) {
         System.err.println(prefix + " " + stackEntry.getKey());
         for (StackTraceElement element : stackEntry.getValue()) {
            System.err.println("     " + element);
         }
      }
   }
}
