/* -*- 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 <fstream>

#include "ns3/core-module.h"

#include "ns3/node-module.h"

#include "ns3/helper-module.h"

#include "ns3/simulator-module.h"

#include "ns3/global-route-manager.h"

NS_LOG_COMPONENT_DEFINE ("DumbbellSimulation");

using namespace ns3;

// Network topology

//

//                       point to point

//                      +--------------+

//                      |              |

//       n0   n1   n2   n3             n4   n5   n6   n7

//       |    |    |    |              |    |    |    |

//       ================              ================

//             lan1                          lan2

//

int 

main (int argc, char *argv[])

{

  LogComponentEnable ("DumbbellSimulation", LOG_LEVEL_INFO);

  NS_LOG_INFO ("Dumbbell Topology Simulation");

//

// Create the lan on the left side of the dumbbell.

//

  NodeContainer lan1;

  lan1.Create (4);

  InternetStackHelper internet;

  internet.Install (lan1);

  CsmaHelper csma;

  csma.SetChannelParameter ("BitRate", StringValue ("10Mbps"));

  csma.SetChannelParameter ("Delay", StringValue ("2ms"));

  NetDeviceContainer dev1 = csma.Install (lan1);

  Ipv4AddressHelper ipv4;

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

  Ipv4InterfaceContainer i1 = ipv4.Assign (dev1);

//

// Create the lan on the right side of the dumbbell.

//

  NodeContainer lan2;

  lan2.Create (4);

  internet.Install (lan2);

  NetDeviceContainer dev2 = csma.Install (lan2);

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

  Ipv4InterfaceContainer i2 = ipv4.Assign (dev2);

//

// Create the point-to-point link to connect the two lans.

//

  NodeContainer backbone = NodeContainer (lan1.Get (3), lan2.Get (0));

  PointToPointHelper p2p;

  p2p.SetChannelParameter ("BitRate", StringValue ("38400bps"));

  p2p.SetChannelParameter ("Delay", StringValue ("20ms"));

  NetDeviceContainer dev3 = p2p.Install (backbone);

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

  ipv4.Assign (dev3);

//

// Create data flows across the link:

//   n0 ==> n4 ==> n0

//   n1 ==> n5 ==> n1

//   n2 ==> n6 ==> n2

//   n3 ==> n7 ==> n3

//

  uint16_t port = 7;

  UdpEchoClientHelper client;

  client.SetRemote (i2.GetAddress (0), port);

  client.SetAppAttribute ("MaxPackets", UintegerValue (100));

  client.SetAppAttribute ("Interval", StringValue ("10ms"));

  client.SetAppAttribute ("PacketSize", UintegerValue (1024));

  ApplicationContainer apps = client.Install (lan1.Get (0));

  apps.Start (Seconds(2.));

  apps.Stop (Seconds (10.0));

  client.SetRemote (i2.GetAddress (1), port);

  apps = client.Install (lan1.Get (1));

  apps.Start (Seconds(2.1));

  apps.Stop (Seconds (10.0));

  client.SetRemote (i2.GetAddress (2), port);

  apps = client.Install (lan1.Get (2));

  apps.Start (Seconds(2.2));

  apps.Stop (Seconds (10.0));

  client.SetRemote (i2.GetAddress (3), port);

  apps = client.Install (lan1.Get (3));

  apps.Start (Seconds(2.3));

  apps.Stop (Seconds (10.0));

  UdpEchoServerHelper server;

  server.SetPort (port);

  apps = server.Install (lan2.Get (0));

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  apps = server.Install (lan2.Get (1));

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  apps = server.Install (lan2.Get (2));

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  apps = server.Install (lan2.Get (3));

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  GlobalRouteManager::PopulateRoutingTables ();

  std::ofstream os;

  os.open ("tutorial.tr");

  PointToPointHelper::EnableAscii (os);

  CsmaHelper::EnableAscii (os);

  PointToPointHelper::EnablePcap ("tutorial");

  CsmaHelper::EnablePcap ("tutorial");

  Simulator::Run ();

  Simulator::Destroy ();

}