/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2012 University of California, Los Angeles
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 */
// ndn-simple-with-pcap.cc
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/ndnSIM-module.h"

using namespace ns3;

class PcapWriter
{
public:
  PcapWriter (const std::string &file)
  {
    PcapHelper helper;
    m_pcap = helper.CreateFile (file, std::ios::out, PcapHelper::DLT_PPP);
  }

  void
  TracePacket (Ptr<const Packet> packet)
  {
    static PppHeader pppHeader;
    pppHeader.SetProtocol (0x0077);

    m_pcap->Write (Simulator::Now (), pppHeader, packet);
  }

private:
  Ptr<PcapFileWrapper> m_pcap;
};


int
main (int argc, char *argv[])
{
  // setting default parameters for PointToPoint links and channels
  Config::SetDefault ("ns3::PointToPointNetDevice::DataRate", StringValue ("1Mbps"));
  Config::SetDefault ("ns3::PointToPointChannel::Delay", StringValue ("10ms"));
  Config::SetDefault ("ns3::DropTailQueue::MaxPackets", StringValue ("20"));

  Config::SetGlobal ("ndn::WireFormat", StringValue ("1"));

  // Read optional command-line parameters (e.g., enable visualizer with ./waf --run=<> --visualize
  CommandLine cmd;
  cmd.Parse (argc, argv);
  
  // Creating nodes
  NodeContainer nodes;
  nodes.Create (3);

  // Connecting nodes using two links
  PointToPointHelper p2p;
  p2p.Install (nodes.Get (0), nodes.Get (1));
  p2p.Install (nodes.Get (1), nodes.Get (2));

  // Install NDN stack on all nodes
  ndn::StackHelper ndnHelper;
  ndnHelper.SetDefaultRoutes (true);
  ndnHelper.InstallAll ();

  // Installing applications

  // Consumer
  ndn::AppHelper consumerHelper ("ns3::ndn::ConsumerCbr");
  // Consumer will request /prefix/0, /prefix/1, ...
  consumerHelper.SetPrefix ("/prefix");
  consumerHelper.SetAttribute ("Frequency", StringValue ("10")); // 10 interests a second
  consumerHelper.Install (nodes.Get (0)); // first node

  // Producer
  ndn::AppHelper producerHelper ("ns3::ndn::Producer");
  // Producer will reply to all requests starting with /prefix
  producerHelper.SetPrefix ("/prefix");
  producerHelper.SetAttribute ("PayloadSize", StringValue("1024"));
  producerHelper.SetAttribute ("Signature", UintegerValue (100));
  producerHelper.SetAttribute ("KeyLocator", StringValue ("/unique/key/locator"));
  producerHelper.Install (nodes.Get (2)); // last node

  PcapWriter trace ("ndn-simple-trace.pcap");
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/$ns3::PointToPointNetDevice/MacTx",
				 MakeCallback (&PcapWriter::TracePacket, &trace));

  Simulator::Stop (Seconds (20.0));

  Simulator::Run ();
  Simulator::Destroy ();

  return 0;
}