/*
 * 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.artemis.jms.client;

import javax.jms.ConnectionConsumer;
import javax.jms.ConnectionMetaData;
import javax.jms.Destination;
import javax.jms.ExceptionListener;
import javax.jms.IllegalStateException;
import javax.jms.InvalidClientIDException;
import javax.jms.JMSException;
import javax.jms.JMSRuntimeException;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueSession;
import javax.jms.ServerSessionPool;
import javax.jms.Session;
import javax.jms.Topic;
import javax.jms.TopicConnection;
import javax.jms.TopicSession;
import java.lang.ref.WeakReference;
import java.util.HashSet;
import java.util.Set;

import org.apache.activemq.artemis.api.core.ActiveMQException;
import org.apache.activemq.artemis.api.core.ActiveMQExceptionType;
import org.apache.activemq.artemis.api.core.SimpleString;
import org.apache.activemq.artemis.api.core.client.ClientSession;
import org.apache.activemq.artemis.api.core.client.ClientSessionFactory;
import org.apache.activemq.artemis.api.core.client.FailoverEventListener;
import org.apache.activemq.artemis.api.core.client.FailoverEventType;
import org.apache.activemq.artemis.api.core.client.SessionFailureListener;
import org.apache.activemq.artemis.api.jms.ActiveMQJMSConstants;
import org.apache.activemq.artemis.core.client.impl.ClientSessionInternal;
import org.apache.activemq.artemis.core.version.Version;
import org.apache.activemq.artemis.reader.MessageUtil;
import org.apache.activemq.artemis.utils.ConcurrentHashSet;
import org.apache.activemq.artemis.utils.UUIDGenerator;
import org.apache.activemq.artemis.utils.VersionLoader;

/**
 * ActiveMQ Artemis implementation of a JMS Connection.
 * <p>
 * The flat implementation of {@link TopicConnection} and {@link QueueConnection} is per design,
 * following the common usage of these as one flat API in JMS 1.1.
 */
public class ActiveMQConnection extends ActiveMQConnectionForContextImpl implements TopicConnection, QueueConnection {

   // Constants ------------------------------------------------------------------------------------
   public static final int TYPE_GENERIC_CONNECTION = 0;

   public static final int TYPE_QUEUE_CONNECTION = 1;

   public static final int TYPE_TOPIC_CONNECTION = 2;

   public static final String EXCEPTION_FAILOVER = "FAILOVER";

   public static final String EXCEPTION_DISCONNECT = "DISCONNECT";

   public static final SimpleString CONNECTION_ID_PROPERTY_NAME = MessageUtil.CONNECTION_ID_PROPERTY_NAME;

   // Static ---------------------------------------------------------------------------------------

   // Attributes -----------------------------------------------------------------------------------

   private final int connectionType;

   private final Set<ActiveMQSession> sessions = new ConcurrentHashSet<ActiveMQSession>();

   private final Set<SimpleString> tempQueues = new ConcurrentHashSet<SimpleString>();

   private final Set<SimpleString> knownDestinations = new ConcurrentHashSet<SimpleString>();

   private volatile boolean hasNoLocal;

   private volatile ExceptionListener exceptionListener;

   private volatile FailoverEventListener failoverEventListener;

   private volatile boolean justCreated = true;

   private volatile ConnectionMetaData metaData;

   private volatile boolean closed;

   private volatile boolean started;

   private String clientID;

   private final ClientSessionFactory sessionFactory;

   private final SimpleString uid;

   private final String username;

   private final String password;

   private final SessionFailureListener listener = new JMSFailureListener(this);

   private final FailoverEventListener failoverListener = new FailoverEventListenerImpl(this);

   private final Version thisVersion;

   private final int dupsOKBatchSize;

   private final int transactionBatchSize;

   private ClientSession initialSession;

   private final Exception creationStack;

   private ActiveMQConnectionFactory factoryReference;

   // Constructors ---------------------------------------------------------------------------------

   public ActiveMQConnection(final String username,
                             final String password,
                             final int connectionType,
                             final String clientID,
                             final int dupsOKBatchSize,
                             final int transactionBatchSize,
                             final ClientSessionFactory sessionFactory) {
      this.username = username;

      this.password = password;

      this.connectionType = connectionType;

      this.clientID = clientID;

      this.sessionFactory = sessionFactory;

      uid = UUIDGenerator.getInstance().generateSimpleStringUUID();

      thisVersion = VersionLoader.getVersion();

      this.dupsOKBatchSize = dupsOKBatchSize;

      this.transactionBatchSize = transactionBatchSize;

      creationStack = new Exception();
   }

   /**
    * This internal method serves basically the Resource Adapter.
    * The resource adapter plays with an XASession and a non XASession.
    * When there is no enlisted transaction, the EE specification mandates that the commit should
    * be done as if it was a nonXA Session (i.e. SessionTransacted).
    * For that reason we have this method to force that nonXASession, since the JMS Javadoc
    * mandates createSession to return a XASession.
    */
   public Session createNonXASession(final boolean transacted, final int acknowledgeMode) throws JMSException {
      checkClosed();

      return createSessionInternal(false, transacted, acknowledgeMode, ActiveMQConnection.TYPE_GENERIC_CONNECTION);
   }

   /**
    * This internal method serves basically the Resource Adapter.
    * The resource adapter plays with an XASession and a non XASession.
    * When there is no enlisted transaction, the EE specification mandates that the commit should
    * be done as if it was a nonXA Session (i.e. SessionTransacted).
    * For that reason we have this method to force that nonXASession, since the JMS Javadoc
    * mandates createSession to return a XASession.
    */
   public Session createNonXATopicSession(final boolean transacted, final int acknowledgeMode) throws JMSException {
      checkClosed();

      return createSessionInternal(false, transacted, acknowledgeMode, ActiveMQConnection.TYPE_TOPIC_CONNECTION);
   }

   /**
    * This internal method serves basically the Resource Adapter.
    * The resource adapter plays with an XASession and a non XASession.
    * When there is no enlisted transaction, the EE specification mandates that the commit should
    * be done as if it was a nonXA Session (i.e. SessionTransacted).
    * For that reason we have this method to force that nonXASession, since the JMS Javadoc
    * mandates createSession to return a XASession.
    */
   public Session createNonXAQueueSession(final boolean transacted, final int acknowledgeMode) throws JMSException {
      checkClosed();

      return createSessionInternal(false, transacted, acknowledgeMode, ActiveMQConnection.TYPE_QUEUE_CONNECTION);
   }

   // Connection implementation --------------------------------------------------------------------

   public synchronized Session createSession(final boolean transacted, final int acknowledgeMode) throws JMSException {
      checkClosed();

      return createSessionInternal(false, transacted, checkAck(transacted, acknowledgeMode), ActiveMQConnection.TYPE_GENERIC_CONNECTION);
   }

   public String getClientID() throws JMSException {
      checkClosed();

      return clientID;
   }

   public void setClientID(final String clientID) throws JMSException {
      checkClosed();

      if (this.clientID != null) {
         throw new IllegalStateException("Client id has already been set");
      }

      if (!justCreated) {
         throw new IllegalStateException("setClientID can only be called directly after the connection is created");
      }

      try {
         initialSession.addUniqueMetaData(ClientSession.JMS_SESSION_CLIENT_ID_PROPERTY, clientID);
      }
      catch (ActiveMQException e) {
         if (e.getType() == ActiveMQExceptionType.DUPLICATE_METADATA) {
            throw new InvalidClientIDException("clientID=" + clientID + " was already set into another connection");
         }
      }

      this.clientID = clientID;
      try {
         this.addSessionMetaData(initialSession);
      }
      catch (ActiveMQException e) {
         JMSException ex = new JMSException("Internal error setting metadata jms-client-id");
         ex.setLinkedException(e);
         ex.initCause(e);
         throw ex;
      }

      justCreated = false;
   }

   public ConnectionMetaData getMetaData() throws JMSException {
      checkClosed();

      justCreated = false;

      if (metaData == null) {
         metaData = new ActiveMQConnectionMetaData(thisVersion);
      }

      return metaData;
   }

   public ExceptionListener getExceptionListener() throws JMSException {
      checkClosed();

      justCreated = false;

      return exceptionListener;
   }

   public void setExceptionListener(final ExceptionListener listener) throws JMSException {
      checkClosed();

      exceptionListener = listener;
      justCreated = false;
   }

   public synchronized void start() throws JMSException {
      checkClosed();

      for (ActiveMQSession session : sessions) {
         session.start();
      }

      justCreated = false;
      started = true;
   }

   public synchronized void signalStopToAllSessions() {
      for (ActiveMQSession session : sessions) {
         ClientSession coreSession = session.getCoreSession();
         if (coreSession instanceof ClientSessionInternal) {
            ClientSessionInternal internalSession = (ClientSessionInternal) coreSession;
            internalSession.setStopSignal();
         }
      }

   }

   public synchronized void stop() throws JMSException {
      threadAwareContext.assertNotMessageListenerThread();

      checkClosed();

      for (ActiveMQSession session : sessions) {
         session.stop();
      }

      justCreated = false;
      started = false;
   }

   public final synchronized void close() throws JMSException {
      threadAwareContext.assertNotCompletionListenerThread();
      threadAwareContext.assertNotMessageListenerThread();

      if (closed) {
         return;
      }

      sessionFactory.close();

      try {
         for (ActiveMQSession session : new HashSet<ActiveMQSession>(sessions)) {
            session.close();
         }

         try {
            if (!tempQueues.isEmpty()) {
               // Remove any temporary queues

               for (SimpleString queueName : tempQueues) {
                  if (!initialSession.isClosed()) {
                     try {
                        initialSession.deleteQueue(queueName);
                     }
                     catch (ActiveMQException ignore) {
                        // Exception on deleting queue shouldn't prevent close from completing
                     }
                  }
               }
            }
         }
         finally {
            if (initialSession != null) {
               initialSession.close();
            }
         }

         closed = true;
      }
      catch (ActiveMQException e) {
         throw JMSExceptionHelper.convertFromActiveMQException(e);
      }
   }

   public ConnectionConsumer createConnectionConsumer(final Destination destination,
                                                      final String messageSelector,
                                                      final ServerSessionPool sessionPool,
                                                      final int maxMessages) throws JMSException {
      checkClosed();

      checkTempQueues(destination);

      // We offer a RA, so no need to implement this for MDBs
      return null;
   }

   private void checkTempQueues(Destination destination) throws JMSException {
      ActiveMQDestination jbdest = (ActiveMQDestination) destination;

      if (jbdest.isTemporary() && !containsTemporaryQueue(jbdest.getSimpleAddress())) {
         throw new JMSException("Can not create consumer for temporary destination " + destination +
                                   " from another JMS connection");
      }
   }

   public ConnectionConsumer createDurableConnectionConsumer(final Topic topic,
                                                             final String subscriptionName,
                                                             final String messageSelector,
                                                             final ServerSessionPool sessionPool,
                                                             final int maxMessages) throws JMSException {
      checkClosed();
      // As spec. section 4.11
      if (connectionType == ActiveMQConnection.TYPE_QUEUE_CONNECTION) {
         String msg = "Cannot create a durable connection consumer on a QueueConnection";
         throw new javax.jms.IllegalStateException(msg);
      }
      checkTempQueues(topic);
      // We offer RA, so no need for this
      return null;
   }

   @Override
   public Session createSession(int sessionMode) throws JMSException {
      checkClosed();
      return createSessionInternal(false, sessionMode == Session.SESSION_TRANSACTED, sessionMode, ActiveMQSession.TYPE_GENERIC_SESSION);

   }

   @Override
   public Session createSession() throws JMSException {
      checkClosed();
      return createSessionInternal(false, false, Session.AUTO_ACKNOWLEDGE, ActiveMQSession.TYPE_GENERIC_SESSION);
   }

   // QueueConnection implementation ---------------------------------------------------------------

   public QueueSession createQueueSession(final boolean transacted, int acknowledgeMode) throws JMSException {
      checkClosed();
      return createSessionInternal(false, transacted, checkAck(transacted, acknowledgeMode), ActiveMQSession.TYPE_QUEUE_SESSION);
   }

   /**
    * I'm keeping this as static as the same check will be done within RA.
    * This is to conform with TCK Tests where we must return ackMode exactly as they want if transacted=false
    */
   public static int checkAck(boolean transacted, int acknowledgeMode) {
      if (!transacted && acknowledgeMode == Session.SESSION_TRANSACTED) {
         return Session.AUTO_ACKNOWLEDGE;
      }

      return acknowledgeMode;
   }

   public ConnectionConsumer createConnectionConsumer(final Queue queue,
                                                      final String messageSelector,
                                                      final ServerSessionPool sessionPool,
                                                      final int maxMessages) throws JMSException {
      checkClosed();
      checkTempQueues(queue);
      return null;
   }

   // TopicConnection implementation ---------------------------------------------------------------

   public TopicSession createTopicSession(final boolean transacted, final int acknowledgeMode) throws JMSException {
      checkClosed();
      return createSessionInternal(false, transacted, checkAck(transacted, acknowledgeMode), ActiveMQSession.TYPE_TOPIC_SESSION);
   }

   public ConnectionConsumer createConnectionConsumer(final Topic topic,
                                                      final String messageSelector,
                                                      final ServerSessionPool sessionPool,
                                                      final int maxMessages) throws JMSException {
      checkClosed();
      checkTempQueues(topic);
      return null;
   }

   @Override
   public ConnectionConsumer createSharedConnectionConsumer(Topic topic,
                                                            String subscriptionName,
                                                            String messageSelector,
                                                            ServerSessionPool sessionPool,
                                                            int maxMessages) throws JMSException {
      return null; // we offer RA
   }

   @Override
   public ConnectionConsumer createSharedDurableConnectionConsumer(Topic topic,
                                                                   String subscriptionName,
                                                                   String messageSelector,
                                                                   ServerSessionPool sessionPool,
                                                                   int maxMessages) throws JMSException {
      return null; // we offer RA
   }

   // Public ---------------------------------------------------------------------------------------

   /**
    * Sets a FailureListener for the session which is notified if a failure occurs on the session.
    *
    * @param listener the listener to add
    * @throws JMSException
    */
   public void setFailoverListener(final FailoverEventListener listener) throws JMSException {
      checkClosed();

      justCreated = false;

      this.failoverEventListener = listener;

   }

   /**
    * @return {@link FailoverEventListener} the current failover event listener for this connection
    * @throws JMSException
    */
   public FailoverEventListener getFailoverListener() throws JMSException {
      checkClosed();

      justCreated = false;

      return failoverEventListener;
   }

   public void addTemporaryQueue(final SimpleString queueAddress) {
      tempQueues.add(queueAddress);
      knownDestinations.add(queueAddress);
   }

   public void removeTemporaryQueue(final SimpleString queueAddress) {
      tempQueues.remove(queueAddress);
   }

   public void addKnownDestination(final SimpleString address) {
      knownDestinations.add(address);
   }

   public boolean containsKnownDestination(final SimpleString address) {
      return knownDestinations.contains(address);
   }

   public boolean containsTemporaryQueue(final SimpleString queueAddress) {
      return tempQueues.contains(queueAddress);
   }

   public boolean hasNoLocal() {
      return hasNoLocal;
   }

   public void setHasNoLocal() {
      hasNoLocal = true;
   }

   public SimpleString getUID() {
      return uid;
   }

   public void removeSession(final ActiveMQSession session) {
      sessions.remove(session);
   }

   public ClientSession getInitialSession() {
      return initialSession;
   }

   // Package protected ----------------------------------------------------------------------------

   // Protected ------------------------------------------------------------------------------------

   // In case the user forgets to close the connection manually

   @Override
   protected final void finalize() throws Throwable {
      if (!closed) {
         ActiveMQJMSClientLogger.LOGGER.connectionLeftOpen(creationStack);

         close();
      }
   }

   protected boolean isXA() {
      return false;
   }

   protected final ActiveMQSession createSessionInternal(final boolean isXA,
                                                         final boolean transacted,
                                                         int acknowledgeMode,
                                                         final int type) throws JMSException {
      if (transacted) {
         acknowledgeMode = Session.SESSION_TRANSACTED;
      }

      try {
         ClientSession session;

         if (acknowledgeMode == Session.SESSION_TRANSACTED) {
            session = sessionFactory.createSession(username, password, isXA, false, false, sessionFactory.getServerLocator().isPreAcknowledge(), transactionBatchSize);
         }
         else if (acknowledgeMode == Session.AUTO_ACKNOWLEDGE) {
            session = sessionFactory.createSession(username, password, isXA, true, true, sessionFactory.getServerLocator().isPreAcknowledge(), 0);
         }
         else if (acknowledgeMode == Session.DUPS_OK_ACKNOWLEDGE) {
            session = sessionFactory.createSession(username, password, isXA, true, true, sessionFactory.getServerLocator().isPreAcknowledge(), dupsOKBatchSize);
         }
         else if (acknowledgeMode == Session.CLIENT_ACKNOWLEDGE) {
            session = sessionFactory.createSession(username, password, isXA, true, false, sessionFactory.getServerLocator().isPreAcknowledge(), transactionBatchSize);
         }
         else if (acknowledgeMode == ActiveMQJMSConstants.INDIVIDUAL_ACKNOWLEDGE) {
            session = sessionFactory.createSession(username, password, isXA, true, false, false, transactionBatchSize);
         }
         else if (acknowledgeMode == ActiveMQJMSConstants.PRE_ACKNOWLEDGE) {
            session = sessionFactory.createSession(username, password, isXA, true, false, true, transactionBatchSize);
         }
         else {
            throw new JMSRuntimeException("Invalid ackmode: " + acknowledgeMode);
         }

         justCreated = false;

         // Setting multiple times on different sessions doesn't matter since RemotingConnection
         // maintains
         // a set (no duplicates)
         session.addFailureListener(listener);
         session.addFailoverListener(failoverListener);

         ActiveMQSession jbs = createAMQSession(isXA, transacted, acknowledgeMode, session, type);

         sessions.add(jbs);

         if (started) {
            session.start();
         }

         this.addSessionMetaData(session);

         return jbs;
      }
      catch (ActiveMQException e) {
         throw JMSExceptionHelper.convertFromActiveMQException(e);
      }
   }

   // Private --------------------------------------------------------------------------------------

   /**
    * @param transacted
    * @param acknowledgeMode
    * @param session
    * @param type
    * @return
    */
   protected ActiveMQSession createAMQSession(boolean isXA,
                                              boolean transacted,
                                              int acknowledgeMode,
                                              ClientSession session,
                                              int type) {
      if (isXA) {
         return new ActiveMQXASession(this, transacted, true, acknowledgeMode, session, type);
      }
      else {
         return new ActiveMQSession(this, transacted, false, acknowledgeMode, session, type);
      }
   }

   protected final void checkClosed() throws JMSException {
      if (closed) {
         throw new IllegalStateException("Connection is closed");
      }
   }

   public void authorize() throws JMSException {
      try {
         initialSession = sessionFactory.createSession(username, password, false, false, false, false, 0);

         addSessionMetaData(initialSession);

         initialSession.addFailureListener(listener);
         initialSession.addFailoverListener(failoverListener);
      }
      catch (ActiveMQException me) {
         throw JMSExceptionHelper.convertFromActiveMQException(me);
      }
   }

   private void addSessionMetaData(ClientSession session) throws ActiveMQException {
      session.addMetaData(ClientSession.JMS_SESSION_IDENTIFIER_PROPERTY, "");
      if (clientID != null) {
         session.addMetaData(ClientSession.JMS_SESSION_CLIENT_ID_PROPERTY, clientID);
      }
   }

   public void setReference(ActiveMQConnectionFactory factory) {
      this.factoryReference = factory;
   }

   public boolean isStarted() {
      return started;
   }

   // Inner classes --------------------------------------------------------------------------------

   private static class JMSFailureListener implements SessionFailureListener {

      private final WeakReference<ActiveMQConnection> connectionRef;

      JMSFailureListener(final ActiveMQConnection connection) {
         connectionRef = new WeakReference<ActiveMQConnection>(connection);
      }

      @Override
      public synchronized void connectionFailed(final ActiveMQException me, boolean failedOver) {
         if (me == null) {
            return;
         }

         ActiveMQConnection conn = connectionRef.get();

         if (conn != null) {
            try {
               final ExceptionListener exceptionListener = conn.getExceptionListener();

               if (exceptionListener != null) {
                  final JMSException je = new JMSException(me.toString(), failedOver ? EXCEPTION_FAILOVER : EXCEPTION_DISCONNECT);

                  je.initCause(me);

                  new Thread(new Runnable() {
                     public void run() {
                        exceptionListener.onException(je);
                     }
                  }).start();
               }
            }
            catch (JMSException e) {
               if (!conn.closed) {
                  ActiveMQJMSClientLogger.LOGGER.errorCallingExcListener(e);
               }
            }
         }
      }

      @Override
      public void connectionFailed(final ActiveMQException me, boolean failedOver, String scaleDownTargetNodeID) {
         connectionFailed(me, failedOver);
      }

      public void beforeReconnect(final ActiveMQException me) {

      }

   }

   private static class FailoverEventListenerImpl implements FailoverEventListener {

      private final WeakReference<ActiveMQConnection> connectionRef;

      FailoverEventListenerImpl(final ActiveMQConnection connection) {
         connectionRef = new WeakReference<ActiveMQConnection>(connection);
      }

      @Override
      public void failoverEvent(final FailoverEventType eventType) {
         ActiveMQConnection conn = connectionRef.get();

         if (conn != null) {
            try {
               final FailoverEventListener failoverListener = conn.getFailoverListener();

               if (failoverListener != null) {

                  new Thread(new Runnable() {
                     public void run() {
                        failoverListener.failoverEvent(eventType);
                     }
                  }).start();
               }
            }
            catch (JMSException e) {
               if (!conn.closed) {
                  ActiveMQJMSClientLogger.LOGGER.errorCallingFailoverListener(e);
               }
            }
         }

      }
   }
}
