/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * 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
 */

#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/csma-module.h"
#include "ns3/internet-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/applications-module.h"
#include "ns3/ipv4-global-routing-helper.h"

// Default Network Topology
//
//                    n1   n2   n3   
//                    |    |    |  
//                    ===========
//                      LAN 10.1.2.0


using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("SecondScriptExample");

int 
main (int argc, char *argv[])
{
  bool verbose = true;
  uint32_t nCsma = 3;

  CommandLine cmd;
  cmd.AddValue ("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma);
  cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose);

  cmd.Parse (argc,argv);

  if (verbose)
    {
      LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);
      LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);
    }

  nCsma = nCsma == 0 ? 1 : nCsma;


  NodeContainer csmaNodes;
  csmaNodes.Create (nCsma);


  CsmaHelper csma;
  csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps"));
  csma.SetChannelAttribute ("Delay", TimeValue (NanoSeconds (6560)));

  NetDeviceContainer csmaDevices;
  csmaDevices = csma.Install (csmaNodes);

  InternetStackHelper stack;
  stack.Install (csmaNodes);

  Ipv4AddressHelper address;

  address.SetBase ("10.1.2.0", "255.255.255.0");
  Ipv4InterfaceContainer csmaInterfaces;
  csmaInterfaces = address.Assign (csmaDevices);


  uint16_t sinkPort = 8080;
  PacketSinkHelper packetSinkHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), sinkPort));
  ApplicationContainer sinkApps = packetSinkHelper.Install (csmaNodes.Get (nCsma-1));
  sinkApps.Add(packetSinkHelper.Install (csmaNodes.Get (nCsma-2)));
  sinkApps.Start (Seconds (0.));
  sinkApps.Stop (Seconds (20.));

  OnOffHelper onOffHelper ("ns3::UdpSocketFactory", Address ());
  onOffHelper.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
  onOffHelper.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));
  AddressValue remoteAddress (InetSocketAddress ("10.1.2.255", sinkPort));
  onOffHelper.SetAttribute ("Remote", remoteAddress);

  ApplicationContainer clientApps = onOffHelper.Install (csmaNodes.Get (0));
  clientApps.Start (Seconds (2.0));
  clientApps.Stop (Seconds (3.0));

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  csma.EnablePcap ("second", csmaDevices.Get (1), true);

  Simulator::Run ();
  Simulator::Destroy ();
  return 0;
}