/**
 * 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.transport.discovery;

import javax.jms.Connection;
import javax.jms.JMSException;
import java.net.URI;
import java.util.Map;
import java.util.Vector;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.CombinationTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.TransportConnector;
import org.apache.activemq.command.DiscoveryEvent;
import org.apache.activemq.transport.StubCompositeTransport;
import org.apache.activemq.util.URISupport;
import org.apache.activemq.util.URISupport.CompositeData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DiscoveryTransportNoBrokerTest extends CombinationTestSupport {

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

   @Override
   public void setUp() throws Exception {
      setAutoFail(true);
      super.setUp();
   }

   public void testNoExtraThreads() throws Exception {
      BrokerService broker = new BrokerService();
      TransportConnector tcp = broker.addConnector("tcp://localhost:0?transport.closeAsync=false");
      String group = "GR-" + System.currentTimeMillis();
      URI discoveryUri = new URI("multicast://default?group=" + group);
      tcp.setDiscoveryUri(discoveryUri);
      broker.start();
      broker.waitUntilStarted();

      Vector<String> existingNames = new Vector<>();
      Thread[] threads = getThreads();
      for (Thread t : threads) {
         existingNames.add(t.getName());
      }
      final int idleThreadCount = threads.length;
      LOG.info("Broker started - thread Count:" + idleThreadCount);

      final int noConnectionToCreate = 10;
      for (int i = 0; i < 10; i++) {
         ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("discovery:(multicast://239.255.2.3:6155?group=" + group + ")?closeAsync=false&startupMaxReconnectAttempts=10&initialReconnectDelay=1000");
         LOG.info("Connecting.");
         Connection connection = factory.createConnection();
         connection.setClientID("test");
         connection.close();
      }
      Thread.sleep(2000);
      threads = getThreads();
      for (Thread t : threads) {
         if (!existingNames.contains(t.getName())) {
            LOG.info("Remaining thread:" + t);
         }
      }
      assertTrue("no extra threads per connection", Thread.activeCount() - idleThreadCount < noConnectionToCreate);
   }

   private Thread[] getThreads() {
      Thread[] threads = new Thread[Thread.activeCount()];
      Thread.enumerate(threads);
      return threads;
   }

   public void testMaxReconnectAttempts() throws JMSException {
      try {
         ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("discovery:(multicast://doesNOTexist)");
         LOG.info("Connecting.");
         Connection connection = factory.createConnection();
         connection.setClientID("test");
         fail("Did not fail to connect as expected.");
      } catch (JMSException expected) {
         assertTrue("reason is java.io.IOException, was: " + expected.getCause(), expected.getCause() instanceof java.io.IOException);
      }
   }

   public void testInitialConnectDelayWithNoBroker() throws Exception {
      // the initialReconnectDelay only kicks in once a set of connect URL have
      // been returned from the discovery agent.
      // Up to that point the reconnectDelay is used which has a default value of 10
      //
      long initialReconnectDelay = 4000;
      long startT = System.currentTimeMillis();
      String groupId = "WillNotMatch" + startT;
      try {
         String urlStr = "discovery:(multicast://default?group=" + groupId +
            ")?useExponentialBackOff=false&maxReconnectAttempts=2&reconnectDelay=" + initialReconnectDelay;
         ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(urlStr);
         LOG.info("Connecting.");
         Connection connection = factory.createConnection();
         connection.setClientID("test");
         fail("Did not fail to connect as expected.");
      } catch (JMSException expected) {
         assertTrue("reason is java.io.IOException, was: " + expected.getCause(), expected.getCause() instanceof java.io.IOException);
         long duration = System.currentTimeMillis() - startT;
         assertTrue("took at least initialReconnectDelay time: " + duration + " e:" + expected, duration >= initialReconnectDelay);
      }
   }

   public void testSetDiscoveredBrokerProperties() throws Exception {
      final String extraParameterName = "connectionTimeout";
      final String extraParameterValue = "3000";
      final URI uri = new URI("discovery:(multicast://default)?initialReconnectDelay=100&" + DiscoveryListener.DISCOVERED_OPTION_PREFIX + extraParameterName + "=" + extraParameterValue);
      CompositeData compositeData = URISupport.parseComposite(uri);

      StubCompositeTransport compositeTransport = new StubCompositeTransport();
      DiscoveryTransport discoveryTransport = DiscoveryTransportFactory.createTransport(compositeTransport, compositeData, compositeData.getParameters());

      discoveryTransport.onServiceAdd(new DiscoveryEvent("tcp://localhost:61616"));
      assertEquals("expected added URI after discovery event", compositeTransport.getTransportURIs().length, 1);

      URI discoveredServiceURI = compositeTransport.getTransportURIs()[0];
      Map<String, String> parameters = URISupport.parseParameters(discoveredServiceURI);
      assertTrue("unable to add parameter to discovered service", parameters.containsKey(extraParameterName));
      assertEquals("incorrect value for parameter added to discovered service", parameters.get(extraParameterName), extraParameterValue);
   }

   public void testSetDiscoveredStaticBrokerProperties() throws Exception {
      final String extraParameterName = "connectionTimeout";
      final String extraParameterValue = "3000";
      final URI uri = new URI("discovery:(static:tcp://localhost:61616)?initialReconnectDelay=100&" + DiscoveryListener.DISCOVERED_OPTION_PREFIX + extraParameterName + "=" + extraParameterValue);
      CompositeData compositeData = URISupport.parseComposite(uri);

      StubCompositeTransport compositeTransport = new StubCompositeTransport();
      DiscoveryTransport discoveryTransport = DiscoveryTransportFactory.createTransport(compositeTransport, compositeData, compositeData.getParameters());

      discoveryTransport.start();
      assertEquals("expected added URI after discovery event", 1, compositeTransport.getTransportURIs().length);

      URI discoveredServiceURI = compositeTransport.getTransportURIs()[0];
      Map<String, String> parameters = URISupport.parseParameters(discoveredServiceURI);
      assertTrue("unable to add parameter to discovered service", parameters.containsKey(extraParameterName));
      assertEquals("incorrect value for parameter added to discovered service", parameters.get(extraParameterName), extraParameterValue);
   }

   public void testAddRemoveDiscoveredBroker() throws Exception {
      final URI uri = new URI("discovery:(multicast://default)?initialReconnectDelay=100&connectionTimeout=3000");
      CompositeData compositeData = URISupport.parseComposite(uri);

      StubCompositeTransport compositeTransport = new StubCompositeTransport();
      DiscoveryTransport discoveryTransport = DiscoveryTransportFactory.createTransport(compositeTransport, compositeData, compositeData.getParameters());

      final String serviceName = "tcp://localhost:61616";
      discoveryTransport.onServiceAdd(new DiscoveryEvent(serviceName));
      assertEquals("expected added URI after discovery event", 1, compositeTransport.getTransportURIs().length);

      discoveryTransport.onServiceRemove(new DiscoveryEvent(serviceName));
      assertEquals("expected URI removed after discovery event", 0, compositeTransport.getTransportURIs().length);
   }
}
