/* -*- 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

 *

 */

//

// Network topology

//

//  n0

//     \ 5 Mb/s, 2ms

//      \          1.5Mb/s, 10ms

//       n2 -------------------------n3

//      /

//     / 5 Mb/s, 2ms

//   n1

//

// - all links are point-to-point links with indicated one-way BW/delay

// - CBR/UDP flows from n0 to n3, and from n3 to n1

// - FTP/TCP flow from n0 to n3, starting at time 1.2 to time 1.35 sec.

// - UDP packet size of 210 bytes, with per-packet interval 0.00375 sec.

//   (i.e., DataRate of 448,000 bps)

// - DropTail queues 

// - Tracing of queues and packet receptions to file "simple-global-routing.tr"

#include <iostream>

#include <fstream>

#include <string>

#include <cassert>

#include "ns3/core-module.h"

#include "ns3/network-module.h"

#include "ns3/internet-module.h"

#include "ns3/point-to-point-module.h"

#include "ns3/applications-module.h"

#include "ns3/flow-monitor-helper.h"

#include "ns3/ipv4-global-routing-helper.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("SimpleGlobalRoutingExample");

int 

main (int argc, char *argv[])

{

  // Users may find it convenient to turn on explicit debugging

  // for selected modules; the below lines suggest how to do this

#if 0 

  LogComponentEnable ("SimpleGlobalRoutingExample", LOG_LEVEL_INFO);

#endif

  // Set up some default values for the simulation.  Use the 

  Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (210));

  Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("448kb/s"));

  //DefaultValue::Bind ("DropTailQueue::m_maxPackets", 30);

  // Allow the user to override any of the defaults and the above

  // DefaultValue::Bind ()s at run-time, via command-line arguments

  CommandLine cmd;

  bool enableFlowMonitor = false;

  cmd.AddValue ("EnableMonitor", "Enable Flow Monitor", enableFlowMonitor);

  cmd.Parse (argc, argv);

  // Here, we will explicitly create four nodes.  In more sophisticated

  // topologies, we could configure a node factory.

  NS_LOG_INFO ("Create nodes.");

  NodeContainer c;

  c.Create (4);

  NodeContainer n0n2 = NodeContainer (c.Get (0), c.Get (2));

  NodeContainer n1n2 = NodeContainer (c.Get (1), c.Get (2));

  NodeContainer n3n2 = NodeContainer (c.Get (3), c.Get (2));

  InternetStackHelper internet;

  internet.Install (c);

  // We create the channels first without any IP addressing information

  NS_LOG_INFO ("Create channels.");

  PointToPointHelper p2p;

  p2p.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));

  p2p.SetChannelAttribute ("Delay", StringValue ("2ms"));

  NetDeviceContainer d0d2 = p2p.Install (n0n2);

  NetDeviceContainer d1d2 = p2p.Install (n1n2);

  p2p.SetDeviceAttribute ("DataRate", StringValue ("1500kbps"));

  p2p.SetChannelAttribute ("Delay", StringValue ("10ms"));

  NetDeviceContainer d3d2 = p2p.Install (n3n2);

  // Later, we add IP addresses.

  NS_LOG_INFO ("Assign IP Addresses.");

  Ipv4AddressHelper ipv4;

  ipv4.SetBase ("10.1.1.0", "255.255.255.0");

  Ipv4InterfaceContainer i0i2 = ipv4.Assign (d0d2);

  ipv4.SetBase ("10.1.2.0", "255.255.255.0");

  Ipv4InterfaceContainer i1i2 = ipv4.Assign (d1d2);

  ipv4.SetBase ("10.1.3.0", "255.255.255.0");

  Ipv4InterfaceContainer i3i2 = ipv4.Assign (d3d2);

  // Create router nodes, initialize routing database and set up the routing

  // tables in the nodes.

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  // Create the OnOff application to send UDP datagrams of size

  // 210 bytes at a rate of 448 Kb/s

  NS_LOG_INFO ("Create Applications.");

  uint16_t port = 9;   // Discard port (RFC 863)

  OnOffHelper onoff ("ns3::UdpSocketFactory", 

                     Address (InetSocketAddress (i3i2.GetAddress (0), port)));

  ApplicationContainer apps = onoff.Install (c.Get (0));

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  // Create a packet sink to receive these packets

  PacketSinkHelper sink ("ns3::UdpSocketFactory",

                         Address (InetSocketAddress (Ipv4Address::GetAny (), port)));

  apps = sink.Install (c.Get (3));

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  // Create a similar flow from n3 to n1, starting at time 1.1 seconds

  onoff.SetAttribute ("Remote", 

                      AddressValue (InetSocketAddress (i1i2.GetAddress (0), port)));

  apps = onoff.Install (c.Get (3));

  apps.Start (Seconds (1.1));

  apps.Stop (Seconds (10.0));

  // Create a packet sink to receive these packets

  apps = sink.Install (c.Get (1));

  apps.Start (Seconds (1.1));

  apps.Stop (Seconds (10.0));

  AsciiTraceHelper ascii;

  p2p.EnableAsciiAll (ascii.CreateFileStream ("simple-global-routing.tr"));

  p2p.EnablePcapAll ("simple-global-routing");

  // Flow Monitor

  Ptr<FlowMonitor> flowmon;

  if (enableFlowMonitor)

    {

      FlowMonitorHelper flowmonHelper;

      flowmon = flowmonHelper.InstallAll ();

    }

  NS_LOG_INFO ("Run Simulation.");

  Simulator::Stop (Seconds (11));

  Simulator::Run ();

  NS_LOG_INFO ("Done.");

  if (enableFlowMonitor)

    {

      flowmon->SerializeToXmlFile ("simple-global-routing.flowmon", false, false);

    }

  Simulator::Destroy ();

  return 0;

}