/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2009 INRIA
 *
 * 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: Mohamed Amine Ismail <amine.ismail@sophia.inria.fr>
 */

// Network topology
//
//       n0    n1
//       |     |
//       =======
//         LAN (CSMA)
//
// - UDP flow from n0 to n1 of packets drawn from a trace file
//  -- option to use IPv4 or IPv6 addressing
//  -- option to disable logging statements

#include <fstream>
#include "ns3/core-module.h"
#include "ns3/csma-module.h"
#include "ns3/applications-module.h"
#include "ns3/internet-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("UdpTraceClientServerExample");

int
main (int argc, char *argv[])
{
  // Declare variables used in command-line arguments
  bool useV6 = false;
  bool logging = true;
  Address serverAddress;

  CommandLine cmd (__FILE__);
  cmd.AddValue ("useIpv6", "Use Ipv6", useV6);
  cmd.AddValue ("logging", "Enable logging", logging);
  cmd.Parse (argc, argv);

  if (logging)
    {
      LogComponentEnable ("UdpClient", LOG_LEVEL_INFO);
      LogComponentEnable ("UdpServer", LOG_LEVEL_INFO);
    }

  NS_LOG_INFO ("Create nodes in above topology.");
  NodeContainer n;
  n.Create (2);

  InternetStackHelper internet;
  internet.Install (n);

  NS_LOG_INFO ("Create channel between the two nodes.");
  CsmaHelper csma;
  csma.SetChannelAttribute ("DataRate", DataRateValue (DataRate (5000000)));
  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
  csma.SetDeviceAttribute ("Mtu", UintegerValue (1500));
  NetDeviceContainer d = csma.Install (n);

  NS_LOG_INFO ("Assign IP Addresses.");
  if (useV6 == false)
    {
      Ipv4AddressHelper ipv4;
      ipv4.SetBase ("10.1.1.0", "255.255.255.0");
      Ipv4InterfaceContainer i = ipv4.Assign (d);
      serverAddress = Address (i.GetAddress (1));
    }
  else
    {
      Ipv6AddressHelper ipv6;
      ipv6.SetBase ("2001:0000:f00d:cafe::", Ipv6Prefix (64));
      Ipv6InterfaceContainer i6 = ipv6.Assign (d);
      serverAddress = Address(i6.GetAddress (1,1));
    }

  NS_LOG_INFO ("Create UdpServer application on node 1.");
  uint16_t port = 4000;
  UdpServerHelper server (port);
  ApplicationContainer apps = server.Install (n.Get (1));
  apps.Start (Seconds (1.0));
  apps.Stop (Seconds (10.0));

  NS_LOG_INFO ("Create UdpClient application on node 0 to send to node 1.");
  uint32_t MaxPacketSize = 1472;  // Back off 20 (IP) + 8 (UDP) bytes from MTU
  UdpTraceClientHelper client (serverAddress, port,"");
  client.SetAttribute ("MaxPacketSize", UintegerValue (MaxPacketSize));
  apps = client.Install (n.Get (0));
  apps.Start (Seconds (2.0));
  apps.Stop (Seconds (10.0));

  NS_LOG_INFO ("Run Simulation.");
  Simulator::Run ();
  Simulator::Destroy ();
  NS_LOG_INFO ("Done.");
}