/*******************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate

Copyright 2002-2007, Rice University. Copyright 2006-2007, Max Planck Institute 
for Software Systems.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

- Neither the name of Rice  University (RICE), Max Planck Institute for Software 
Systems (MPI-SWS) nor the names of its contributors may be used to endorse or 
promote products derived from this software without specific prior written 
permission.

This software is provided by RICE, MPI-SWS and the contributors on an "as is" 
basis, without any representations or warranties of any kind, express or implied 
including, but not limited to, representations or warranties of 
non-infringement, merchantability or fitness for a particular purpose. In no 
event shall RICE, MPI-SWS or contributors be liable for any direct, indirect, 
incidental, special, exemplary, or consequential damages (including, but not 
limited to, procurement of substitute goods or services; loss of use, data, or 
profits; or business interruption) however caused and on any theory of 
liability, whether in contract, strict liability, or tort (including negligence
or otherwise) arising in any way out of the use of this software, even if 
advised of the possibility of such damage.

*******************************************************************************/ 
package org.mpisws.p2p.testing.transportlayer;

import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.JUnitCore;
import org.mpisws.p2p.transport.ErrorHandler;
import org.mpisws.p2p.transport.MessageCallback;
import org.mpisws.p2p.transport.MessageRequestHandle;
import org.mpisws.p2p.transport.P2PSocket;
import org.mpisws.p2p.transport.P2PSocketReceiver;
import org.mpisws.p2p.transport.SocketCallback;
import org.mpisws.p2p.transport.SocketRequestHandle;
import org.mpisws.p2p.transport.TransportLayer;
import org.mpisws.p2p.transport.TransportLayerCallback;
import org.mpisws.p2p.transport.wire.WireTransportLayer;
import org.mpisws.p2p.transport.wire.WireTransportLayerImpl;
import org.mpisws.p2p.transport.wire.exception.StalledSocketException;
import org.mpisws.p2p.transport.wire.magicnumber.MagicNumberTransportLayer;

import rice.Continuation;
import rice.environment.Environment;
import rice.environment.logging.Logger;

public class MagicNumberTest extends WireTest {
  static TransportLayer<InetSocketAddress, ByteBuffer> carol, dave;
  
  /**
   * Goes to Alice/Bob
   */
  public static final byte[] GOOD_HDR = {(byte)0xDE,(byte)0xAD,(byte)0xBE,(byte)0xEF};
  
  /**
   * Goes to Carol
   */
  public static final byte[] BAD_HDR = {(byte)0xDE,(byte)0xED,(byte)0xBE,(byte)0xEF};
  
  /**
   * Goes to Dave
   */
  public static final byte[] NO_HDR = {};
  
  
  
  @BeforeClass
  public static void setUpBeforeClass() throws Exception {
    int startPort = 5009;
    env = new Environment();
    logger = env.getLogManager().getLogger(MagicNumberTest.class, null);
    InetAddress addr = InetAddress.getLocalHost();    
//    InetAddress addr = InetAddress.getByName("10.0.0.10");
    alice = new MagicNumberTransportLayer(
        new WireTransportLayerImpl(new InetSocketAddress(addr,startPort),env, null)
        ,env, null,GOOD_HDR, 2000);
    bob = new MagicNumberTransportLayer(
      new WireTransportLayerImpl(new InetSocketAddress(addr,startPort+1),env, null)
      ,env, null, GOOD_HDR, 2000);
    carol = new MagicNumberTransportLayer<InetSocketAddress>(
        new WireTransportLayerImpl(new InetSocketAddress(addr,startPort+2),env, null)
        ,env, null,BAD_HDR, 2000);
    dave = new MagicNumberTransportLayer<InetSocketAddress>(
        new WireTransportLayerImpl(new InetSocketAddress(addr,startPort+3),env, null)
        ,env, null,NO_HDR, 2000);
  }

  /*********************** TCP *************************/  
  /**
   * 3 parts:
   * 
   * - Alice opens a TCP socket to Bob
   * - Alice sends to Bob
   * - Alice closes the Socket
   */
  @Test
  public void wrongHeaderTCP() throws Exception {
    Map<String, Object> options = new HashMap<String, Object>();
    options.put(WireTransportLayer.OPTION_TRANSPORT_TYPE, WireTransportLayer.TRANSPORT_TYPE_GUARANTEED);
    
    final List<P2PSocket> aliceSockets = new ArrayList<P2PSocket>();
    final List<P2PSocket> carolSockets = new ArrayList<P2PSocket>();
    final List<Throwable> exceptionList = new ArrayList<Throwable>(1);
    final List<byte[]> unexpectedData = new ArrayList<byte[]>(1);
    final Object lock = new Object();
    
    // Part I opening a connection
    carol.setCallback(new TransportLayerCallback<InetSocketAddress, ByteBuffer>() {
    
      public void messageReceived(InetSocketAddress i, ByteBuffer m, Map<String, Object> options)
          throws IOException {
        // TODO Auto-generated method stub
    
      }
    
      public void incomingSocket(P2PSocket s)
          throws IOException {
        synchronized(lock) {
          carolSockets.add(s);
          lock.notify();
        }
      }
    
    });
    carol.setErrorHandler(new ErrorHandler<InetSocketAddress>() {      
      public void receivedException(InetSocketAddress i, Throwable error) {
        synchronized(lock) {
          error.printStackTrace();
          exceptionList.add(error); // should not happen
          lock.notify();
        }
      }    
      public void receivedUnexpectedData(InetSocketAddress i, byte[] bytes, int pos, Map<String, Object> options) {
        synchronized(lock) {
          unexpectedData.add(bytes); 
          lock.notify();
        }
      }    
    });

    
    alice.openSocket(carol.getLocalIdentifier(), new SocketCallback<InetSocketAddress>(){    
      public void receiveResult(SocketRequestHandle<InetSocketAddress> cancellable, P2PSocket<InetSocketAddress> result) {
        synchronized(lock) {
          aliceSockets.add(result);
          lock.notify();
        }
      }
    
      public void receiveException(SocketRequestHandle<InetSocketAddress> s, IOException exception) {
        synchronized(lock) {
          exceptionList.add(exception);
          lock.notify();
        }
      }
    }, 
    options);
    
    // wait for it to open
    long timeout = env.getTimeSource().currentTimeMillis()+4000;
    synchronized(lock) {
      while((env.getTimeSource().currentTimeMillis()<timeout) && exceptionList.isEmpty() && (aliceSockets.isEmpty() || unexpectedData.isEmpty())) {
        lock.wait(1000); 
      }
    }

    carol.setCallback(null);
    carol.setErrorHandler(null);
    
    assertTrue(aliceSockets.size() == 1);
    assertTrue(carolSockets.size() == 0);
    assertTrue(unexpectedData.size() == 1);
    assertTrue(exceptionList.isEmpty());
    assertTrue(unexpectedData.size() == 1);  // we got 1 result
    
    //hdr was the good hdr:
    assertTrue(unexpectedData.get(0).length >= GOOD_HDR.length);    
    byte[] hdrpart = new byte[GOOD_HDR.length];
    System.arraycopy(unexpectedData.get(0), 0, hdrpart, 0, GOOD_HDR.length);
    assertTrue(Arrays.equals(hdrpart, GOOD_HDR)); // it is equal
    
  }
  
  /**
   * 3 parts:
   * 
   * - Dave opens a TCP socket to Bob but withholds the HEADER
   * - Bob closes the Socket
   */
  @Test
  public void stallTCP() throws Exception {
    Map<String, Object> options = new HashMap<String, Object>();
    options.put(WireTransportLayer.OPTION_TRANSPORT_TYPE, WireTransportLayer.TRANSPORT_TYPE_GUARANTEED);
    
    final List<P2PSocket> aliceSockets = new ArrayList<P2PSocket>();
    final List<P2PSocket> daveSockets = new ArrayList<P2PSocket>();
    final List<Throwable> exceptionList = new ArrayList<Throwable>(1);
    final List<ByteBuffer> receivedList = new ArrayList<ByteBuffer>(1);
    final List<ByteBuffer> sentList = new ArrayList<ByteBuffer>(1);
    final Object lock = new Object();
    
    // Part I opening a connection
    alice.setCallback(new TransportLayerCallback<InetSocketAddress, ByteBuffer>() {    
      public void messageReceived(InetSocketAddress i, ByteBuffer m, Map<String, Object> options)
          throws IOException {
        // TODO Auto-generated method stub    
      }
    
      public void incomingSocket(P2PSocket s)
          throws IOException {
        synchronized(lock) {
          aliceSockets.add(s);
          lock.notify();
        }
      }    
    });
    
    alice.setErrorHandler(new ErrorHandler<InetSocketAddress>(){
    
      public void receivedUnexpectedData(InetSocketAddress i, byte[] bytes, int pos, Map<String, Object> options) {        
      }
    
      public void receivedException(InetSocketAddress i, Throwable error) {        
        synchronized(lock) {
          exceptionList.add(error); // should not happen
          lock.notify();
        }
      }    
    });
    
    dave.openSocket((InetSocketAddress)alice.getLocalIdentifier(), new SocketCallback<InetSocketAddress>(){    
      public void receiveResult(SocketRequestHandle<InetSocketAddress> cancellable, P2PSocket<InetSocketAddress> result) {
        synchronized(lock) {
          daveSockets.add(result);
          lock.notify();
        }
      }
    
      public void receiveException(SocketRequestHandle<InetSocketAddress> s, IOException exception) {
        synchronized(lock) {
          exceptionList.add(exception);
          lock.notify();
        }
      }
    }, 
    options);
    
    // wait for it to open
    long timeout = env.getTimeSource().currentTimeMillis()+34000;
    synchronized(lock) {
      while((env.getTimeSource().currentTimeMillis()<timeout) && (daveSockets.isEmpty() || exceptionList.isEmpty())) {
        lock.wait(1000); 
      }
    }
    
    alice.setCallback(null);
    alice.setErrorHandler(null);

    assertTrue(aliceSockets.size() == 0);
    assertTrue(daveSockets.size() == 1);
    
    // examine exception
    assertTrue(exceptionList.size() == 1);
    Throwable e = exceptionList.get(0);
    assertTrue(e instanceof StalledSocketException);
    
    // it's an ephimeral port
//    StalledSocketException sse = (StalledSocketException)e;
//    System.out.println(sse);
//    System.out.println(dave.getLocalIdentifier());
//    assertTrue(sse.getInetSocketAddress().equals(dave.getLocalIdentifier()));
  }

  
  /*********************** UDP *************************/  
  /**
   * Sends udp message from alice to carol, should fail.
   */
  @Test
  public void wrongHeaderUDP() throws Throwable {
    final byte[] sentBytes = {0,1,2,3,4,5,6,7};
    final ByteBuffer sentBuffer = ByteBuffer.wrap(sentBytes); 
   
    // added to every time bob receives something
    final List<ByteBuffer> receivedList = new ArrayList<ByteBuffer>(1);
    final List<Throwable> exceptionList = new ArrayList<Throwable>(1);
    final List<MessageRequestHandle> sentList = new ArrayList<MessageRequestHandle>(1);
    final List<byte[]> unexpectedData = new ArrayList<byte[]>(1);
    final Object lock = new Object();
    
    Map<String, Object> options = new HashMap<String, Object>();
    options.put(WireTransportLayer.OPTION_TRANSPORT_TYPE, WireTransportLayer.TRANSPORT_TYPE_DATAGRAM);
    
    
    
    // make a way for bob to receive the callback
    carol.setCallback(new TransportLayerCallback<InetSocketAddress, ByteBuffer>() {    
      public void messageReceived(InetSocketAddress i, ByteBuffer buf, Map<String, Object> options) throws IOException {
        synchronized(lock) {
          receivedList.add(buf);
          lock.notify();
        }
      }    
      public void incomingSocket(P2PSocket<InetSocketAddress> s) {}    
    });
    
    carol.setErrorHandler(new ErrorHandler<InetSocketAddress>() {
    
      public void receivedException(InetSocketAddress i, Throwable error) {
        synchronized(lock) {
          error.printStackTrace();
          exceptionList.add(error); // should not happen
          lock.notify();
        }
      }    
      public void receivedUnexpectedData(InetSocketAddress i, byte[] bytes, int pos, Map<String, Object> options) {
        synchronized(lock) {
          unexpectedData.add(bytes); 
          lock.notify();
        }
      }    
    });
    
    MessageCallback<InetSocketAddress, ByteBuffer> ret = new MessageCallback<InetSocketAddress, ByteBuffer>() {    
      public void ack(MessageRequestHandle<InetSocketAddress, ByteBuffer> msg) {
        synchronized(lock) {
          sentList.add(msg);
          lock.notify();
        }        
      }
      public void sendFailed(MessageRequestHandle<InetSocketAddress, ByteBuffer> msg, IOException reason) {
        synchronized(lock) {
          exceptionList.add(reason);
          lock.notify();
        }
      }
    };
    
    MessageRequestHandle handle = alice.sendMessage(
          carol.getLocalIdentifier(), 
          sentBuffer, 
          ret, 
          options);
      
    // block for completion
    long timeout = env.getTimeSource().currentTimeMillis()+4000;
    synchronized(lock) {
      while((env.getTimeSource().currentTimeMillis()<timeout) && exceptionList.isEmpty() && receivedList.isEmpty() && (sentList.isEmpty() || unexpectedData.isEmpty())) {
        lock.wait(1000); 
      }
    }

    // results
    carol.setCallback(null);
    carol.setErrorHandler(null);
    
    if (!exceptionList.isEmpty()) throw exceptionList.get(0); // we got no exceptions
    assertTrue(receivedList.isEmpty());  // we got 1 result
    assertTrue(sentList.size() >= 1); // we got one notification
    assertTrue(sentList.get(0) == handle); // it is the buffer we sent        
    assertTrue(handle.getMessage() == sentBuffer); // it is the buffer we sent        
    assertTrue(unexpectedData.size() >= 1);  // we got 1 result
    
    //hdr was the good hdr:
    assertTrue(unexpectedData.get(0).length >= GOOD_HDR.length);    
    byte[] hdrpart = new byte[GOOD_HDR.length];
    System.arraycopy(unexpectedData.get(0), 0, hdrpart, 0, GOOD_HDR.length);
    assertTrue(Arrays.equals(hdrpart, GOOD_HDR)); // it is equal
  }

  
  /**
   * @param args
   */
  public static void main(String[] args) throws Exception {
    JUnitCore.main("org.mpisws.p2p.testing.transportlayer.MagicNumberTest");
  }

}
