/**
 * 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.reliable;

import java.util.Queue;

import junit.framework.TestCase;

import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.transport.StubTransport;
import org.apache.activemq.transport.StubTransportListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 */
public class ReliableTransportTest extends TestCase {

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

   protected ReliableTransport transport;
   protected StubTransportListener listener = new StubTransportListener();
   protected ReplayStrategy replayStrategy;

   public void testValidSequenceOfPackets() throws Exception {
      int[] sequenceNumbers = {1, 2, 3, 4, 5, 6, 7};

      sendStreamOfCommands(sequenceNumbers, true);
   }

   public void testValidWrapAroundPackets() throws Exception {
      int[] sequenceNumbers = new int[10];

      int value = Integer.MAX_VALUE - 3;
      transport.setExpectedCounter(value);

      for (int i = 0; i < 10; i++) {
         LOG.info("command: " + i + " = " + value);
         sequenceNumbers[i] = value++;
      }

      sendStreamOfCommands(sequenceNumbers, true);
   }

   public void testDuplicatePacketsDropped() throws Exception {
      int[] sequenceNumbers = {1, 2, 2, 3, 4, 5, 6, 7};

      sendStreamOfCommands(sequenceNumbers, true, 7);
   }

   public void testOldDuplicatePacketsDropped() throws Exception {
      int[] sequenceNumbers = {1, 2, 3, 4, 5, 2, 6, 7};

      sendStreamOfCommands(sequenceNumbers, true, 7);
   }

   public void testOldDuplicatePacketsDroppedUsingNegativeCounters() throws Exception {
      int[] sequenceNumbers = {-3, -1, -3, -2, -1, 0, 1, -1, 3, 2, 0, 2, 4};

      transport.setExpectedCounter(-3);

      sendStreamOfCommands(sequenceNumbers, true, 8);
   }

   public void testWrongOrderOfPackets() throws Exception {
      int[] sequenceNumbers = {4, 3, 1, 5, 2, 7, 6, 8, 10, 9};

      sendStreamOfCommands(sequenceNumbers, true);
   }

   public void testMissingPacketsFails() throws Exception {
      int[] sequenceNumbers = {1, 2, /* 3, */4, 5, 6, 7, 8, 9, 10};

      sendStreamOfCommands(sequenceNumbers, false);
   }

   protected void sendStreamOfCommands(int[] sequenceNumbers, boolean expected) {
      sendStreamOfCommands(sequenceNumbers, expected, sequenceNumbers.length);
   }

   protected void sendStreamOfCommands(int[] sequenceNumbers, boolean expected, int expectedCount) {
      for (int i = 0; i < sequenceNumbers.length; i++) {
         int commandId = sequenceNumbers[i];

         ConsumerInfo info = new ConsumerInfo();
         info.setSelector("Cheese: " + commandId);
         info.setCommandId(commandId);

         transport.onCommand(info);
      }

      Queue exceptions = listener.getExceptions();
      Queue commands = listener.getCommands();
      if (expected) {
         if (!exceptions.isEmpty()) {
            Exception e = (Exception) exceptions.remove();
            e.printStackTrace();
            fail("Caught exception: " + e);
         }
         assertEquals("number of messages received", expectedCount, commands.size());

         assertEquals("Should have no buffered commands", 0, transport.getBufferedCommandCount());
      }
      else {
         assertTrue("Should have received an exception!", exceptions.size() > 0);
         Exception e = (Exception) exceptions.remove();
         LOG.info("Caught expected response: " + e);
      }
   }

   protected void setUp() throws Exception {
      if (replayStrategy == null) {
         replayStrategy = new ExceptionIfDroppedReplayStrategy();
      }
      transport = new ReliableTransport(new StubTransport(), replayStrategy);
      transport.setTransportListener(listener);
      transport.start();
   }

}
