/**
 * 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.bugs;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

import javax.jms.Connection;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import junit.framework.TestCase;

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

public class SlowConsumerTest extends TestCase {

   private static final Logger LOG = LoggerFactory.getLogger(SlowConsumerTest.class);
   private static final int MESSAGES_COUNT = 10000;

   private final int messageLogFrequency = 2500;
   private final long messageReceiveTimeout = 10000L;

   private Socket stompSocket;
   private ByteArrayOutputStream inputBuffer;
   private int messagesCount;

   /**
    * @param args
    * @throws Exception
    */
   public void testRemoveSubscriber() throws Exception {
      final BrokerService broker = new BrokerService();
      broker.setPersistent(true);
      broker.setUseJmx(true);
      broker.setDeleteAllMessagesOnStartup(true);

      broker.addConnector("tcp://localhost:0").setName("Default");
      broker.start();
      ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(broker.getTransportConnectors().get(0).getPublishableConnectString());
      final Connection connection = factory.createConnection();
      connection.start();

      Thread producingThread = new Thread("Producing thread") {
         public void run() {
            try {
               Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
               MessageProducer producer = session.createProducer(new ActiveMQQueue(getDestinationName()));
               for (int idx = 0; idx < MESSAGES_COUNT; ++idx) {
                  Message message = session.createTextMessage("" + idx);
                  producer.send(message);
                  LOG.debug("Sending: " + idx);
               }
               producer.close();
               session.close();
            }
            catch (Throwable ex) {
               ex.printStackTrace();
            }
         }
      };
      producingThread.setPriority(Thread.MAX_PRIORITY);
      producingThread.start();
      Thread.sleep(1000);

      Thread consumingThread = new Thread("Consuming thread") {

         public void run() {
            try {
               Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
               MessageConsumer consumer = session.createConsumer(new ActiveMQQueue(getDestinationName()));
               int diff = 0;
               while (messagesCount != MESSAGES_COUNT) {
                  Message msg = consumer.receive(messageReceiveTimeout);
                  if (msg == null) {
                     LOG.warn("Got null message at count: " + messagesCount + ". Continuing...");
                     break;
                  }
                  String text = ((TextMessage) msg).getText();
                  int currentMsgIdx = Integer.parseInt(text);
                  LOG.debug("Received: " + text + " messageCount: " + messagesCount);
                  msg.acknowledge();
                  if ((messagesCount + diff) != currentMsgIdx) {
                     LOG.debug("Message(s) skipped!! Should be message no.: " + messagesCount + " but got: " + currentMsgIdx);
                     diff = currentMsgIdx - messagesCount;
                  }
                  ++messagesCount;
                  if (messagesCount % messageLogFrequency == 0) {
                     LOG.info("Received: " + messagesCount + " messages so far");
                  }
                  // Thread.sleep(70);
               }
            }
            catch (Throwable ex) {
               ex.printStackTrace();
            }
         }
      };
      consumingThread.start();
      consumingThread.join();

      assertEquals(MESSAGES_COUNT, messagesCount);

   }

   public void sendFrame(String data) throws Exception {
      byte[] bytes = data.getBytes("UTF-8");
      OutputStream outputStream = stompSocket.getOutputStream();
      for (int i = 0; i < bytes.length; i++) {
         outputStream.write(bytes[i]);
      }
      outputStream.flush();
   }

   public String receiveFrame(long timeOut) throws Exception {
      stompSocket.setSoTimeout((int) timeOut);
      InputStream is = stompSocket.getInputStream();
      int c = 0;
      for (;;) {
         c = is.read();
         if (c < 0) {
            throw new IOException("socket closed.");
         }
         else if (c == 0) {
            c = is.read();
            byte[] ba = inputBuffer.toByteArray();
            inputBuffer.reset();
            return new String(ba, "UTF-8");
         }
         else {
            inputBuffer.write(c);
         }
      }
   }

   protected String getDestinationName() {
      return getClass().getName() + "." + getName();
   }
}
