/* -*- 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
 *
 * (c) 2009, GTech Systems, Inc. - Alfred Park <park@gtech-systems.com>
 *
 * DARPA NMS Campus Network Model
 *
 * This topology replicates the original NMS Campus Network model
 * with the exception of chord links (which were never utilized in the
 * original model)
 * Link Bandwidths and Delays may not be the same as the original
 * specifications
 *
 * The fundamental unit of the NMS model consists of a campus network. The
 * campus network topology can been seen here:
 * http://www.nsnam.org/~jpelkey3/nms.png
 * The number of hosts (default 42) is variable.  Finally, an arbitrary
 * number of these campus networks can be connected together (default 2)
 * to make very large simulations.
 */

// for timing functions
#include <cstdlib>
#include <sys/time.h>
#include <fstream>

#include "ns3/core-module.h"
#include "ns3/simulator-module.h"
#include "ns3/node-module.h"
#include "ns3/helper-module.h"
#include "ns3/global-routing-module.h"
#include "ns3/onoff-application.h"
#include "ns3/packet-sink.h"
#include "ns3/point-to-point-net-device.h"
#include "ns3/simulator.h"
#include "ns3/ipv4-static-routing-helper.h"
#include "ns3/ipv4-list-routing-helper.h"

using namespace std;
using namespace ns3;

typedef struct timeval TIMER_TYPE;
#define TIMER_NOW(_t) gettimeofday(&_t,NULL);
#define TIMER_SECONDS(_t) ((double)(_t).tv_sec + (_t).tv_usec*1e-6)
#define TIMER_DIFF(_t1, _t2) (TIMER_SECONDS(_t1)-TIMER_SECONDS(_t2))

NS_LOG_COMPONENT_DEFINE ("CampusNetworkModel");

void Progress ()
{
  Time now = Simulator::Now ();
  Simulator::Schedule (Seconds (0.1), Progress);
}

int
main (int argc, char *argv[])
{
  TIMER_TYPE t0, t1, t2;
  TIMER_NOW(t0);
  cout << " ==== DARPA NMS CAMPUS NETWORK SIMULATION ====" << endl;
  LogComponentEnable ("OnOffApplication", LOG_LEVEL_INFO);

  int nCN = 2, nLANClients = 42;
  bool nix = true;

  CommandLine cmd;
  cmd.AddValue ("CN", "Number of total CNs [2]", nCN);
  cmd.AddValue ("LAN", "Number of nodes per LAN [42]", nLANClients);
  cmd.AddValue ("NIX", "Toggle nix-vector routing", nix);
  cmd.Parse (argc,argv);

  if (nCN < 2) 
    {
      cout << "Number of total CNs (" << nCN << ") lower than minimum of 2"
        << endl;
      return 1;
    }

  cout << "Number of CNs: " << nCN << ", LAN nodes: " << nLANClients << endl;

  NodeContainer nodes_net0[nCN][3], nodes_net1[nCN][6], nodes_netLR[nCN],
                nodes_net2[nCN][14], nodes_net2LAN[nCN][7][nLANClients],
                nodes_net3[nCN][9], nodes_net3LAN[nCN][5][nLANClients];
  PointToPointHelper p2p_2gb200ms, p2p_1gb5ms, p2p_100mb1ms;
  InternetStackHelper stack;
  Ipv4InterfaceContainer ifs, ifs0[nCN][3], ifs1[nCN][6], ifs2[nCN][14],
                         ifs3[nCN][9], ifs2LAN[nCN][7][nLANClients],
                         ifs3LAN[nCN][5][nLANClients];
  Ipv4AddressHelper address;
  std::ostringstream oss;
  p2p_1gb5ms.SetDeviceAttribute ("DataRate", StringValue ("1Gbps"));
  p2p_1gb5ms.SetChannelAttribute ("Delay", StringValue ("5ms"));
  p2p_2gb200ms.SetDeviceAttribute ("DataRate", StringValue ("2Gbps"));
  p2p_2gb200ms.SetChannelAttribute ("Delay", StringValue ("200ms"));
  p2p_100mb1ms.SetDeviceAttribute ("DataRate", StringValue ("100Mbps"));
  p2p_100mb1ms.SetChannelAttribute ("Delay", StringValue ("1ms"));

  // Setup NixVector Routing
  Ipv4NixVectorHelper nixRouting;
  Ipv4StaticRoutingHelper staticRouting;

  Ipv4ListRoutingHelper list;
  list.Add (staticRouting, 0);
  list.Add (nixRouting, 10);

  if (nix)
    {
      stack.SetRoutingHelper (list);
    }

  // Create Campus Networks
  for (int z = 0; z < nCN; ++z) 
    {
      cout << "Creating Campus Network " << z << ":" << endl;
      // Create Net0
      cout << "  SubNet [ 0";
      for (int i = 0; i < 3; ++i) 
        {
          nodes_net0[z][i].Create (1);
          stack.Install (nodes_net0[z][i]);
        }
      nodes_net0[z][0].Add (nodes_net0[z][1].Get (0));
      nodes_net0[z][1].Add (nodes_net0[z][2].Get (0));
      nodes_net0[z][2].Add (nodes_net0[z][0].Get (0));
      NetDeviceContainer ndc0[3];
      for (int i = 0; i < 3; ++i) 
        {
          ndc0[i] = p2p_1gb5ms.Install (nodes_net0[z][i]);
        }
      // Create Net1
      cout << " 1";
      for (int i = 0; i < 6; ++i) 
        {
          nodes_net1[z][i].Create (1);
          stack.Install (nodes_net1[z][i]);
        }
      nodes_net1[z][0].Add (nodes_net1[z][1].Get (0));
      nodes_net1[z][2].Add (nodes_net1[z][0].Get (0));
      nodes_net1[z][3].Add (nodes_net1[z][0].Get (0));
      nodes_net1[z][4].Add (nodes_net1[z][1].Get (0));
      nodes_net1[z][5].Add (nodes_net1[z][1].Get (0));
      NetDeviceContainer ndc1[6];
      for (int i = 0; i < 6; ++i) 
        {
          if (i == 1)
            {
              continue;
            }
          ndc1[i] = p2p_1gb5ms.Install (nodes_net1[z][i]);
        }
      // Connect Net0 <-> Net1
      NodeContainer net0_1;
      net0_1.Add (nodes_net0[z][2].Get (0));
      net0_1.Add (nodes_net1[z][0].Get (0));
      NetDeviceContainer ndc0_1;
      ndc0_1 = p2p_1gb5ms.Install (net0_1);
      oss.str("");
      oss << 10 + z << ".1.252.0";
      address.SetBase (oss.str ().c_str (), "255.255.255.0");
      ifs = address.Assign (ndc0_1);
      // Create Net2
      cout << " 2";
      for (int i = 0; i < 14; ++i) 
        {
          nodes_net2[z][i].Create (1);
          stack.Install (nodes_net2[z][i]);
        }
      nodes_net2[z][0].Add (nodes_net2[z][1].Get (0));
      nodes_net2[z][2].Add (nodes_net2[z][0].Get (0));
      nodes_net2[z][1].Add (nodes_net2[z][3].Get (0));
      nodes_net2[z][3].Add (nodes_net2[z][2].Get (0));
      nodes_net2[z][4].Add (nodes_net2[z][2].Get (0));
      nodes_net2[z][5].Add (nodes_net2[z][3].Get (0));
      nodes_net2[z][6].Add (nodes_net2[z][5].Get (0));
      nodes_net2[z][7].Add (nodes_net2[z][2].Get (0));
      nodes_net2[z][8].Add (nodes_net2[z][3].Get (0));
      nodes_net2[z][9].Add (nodes_net2[z][4].Get (0));
      nodes_net2[z][10].Add (nodes_net2[z][5].Get (0));
      nodes_net2[z][11].Add (nodes_net2[z][6].Get (0));
      nodes_net2[z][12].Add (nodes_net2[z][6].Get (0));
      nodes_net2[z][13].Add (nodes_net2[z][6].Get (0));
      NetDeviceContainer ndc2[14];
      for (int i = 0; i < 14; ++i) 
        {
          ndc2[i] = p2p_1gb5ms.Install (nodes_net2[z][i]);
        }
      NetDeviceContainer ndc2LAN[7][nLANClients];
      for (int i = 0; i < 7; ++i) 
        {
          oss.str ("");
          oss << 10 + z << ".4." << 15 + i << ".0";
          address.SetBase (oss.str ().c_str (), "255.255.255.0");
          for (int j = 0; j < nLANClients; ++j) 
            {
              nodes_net2LAN[z][i][j].Create (1);
              stack.Install (nodes_net2LAN[z][i][j]);
              nodes_net2LAN[z][i][j].Add (nodes_net2[z][i+7].Get (0));
              ndc2LAN[i][j] = p2p_100mb1ms.Install (nodes_net2LAN[z][i][j]);
              ifs2LAN[z][i][j] = address.Assign (ndc2LAN[i][j]);
            }
        }
      // Create Net3
      cout << " 3 ]" << endl;
      for (int i = 0; i < 9; ++i) 
        {
          nodes_net3[z][i].Create (1);
          stack.Install(nodes_net3[z][i]);
        }
      nodes_net3[z][0].Add (nodes_net3[z][1].Get (0));
      nodes_net3[z][1].Add (nodes_net3[z][2].Get (0));
      nodes_net3[z][2].Add (nodes_net3[z][3].Get (0));
      nodes_net3[z][3].Add (nodes_net3[z][1].Get (0));
      nodes_net3[z][4].Add (nodes_net3[z][0].Get (0));
      nodes_net3[z][5].Add (nodes_net3[z][0].Get (0));
      nodes_net3[z][6].Add (nodes_net3[z][2].Get (0));
      nodes_net3[z][7].Add (nodes_net3[z][3].Get (0));
      nodes_net3[z][8].Add (nodes_net3[z][3].Get (0));
      NetDeviceContainer ndc3[9];
      for (int i = 0; i < 9; ++i) 
        {
          ndc3[i] = p2p_1gb5ms.Install (nodes_net3[z][i]);
        }
      NetDeviceContainer ndc3LAN[5][nLANClients];
      for (int i = 0; i < 5; ++i) 
        {
          oss.str ("");
          oss << 10 + z << ".5." << 10 + i << ".0";
          address.SetBase (oss.str ().c_str (), "255.255.255.255");
          for (int j = 0; j < nLANClients; ++j) 
            {
              nodes_net3LAN[z][i][j].Create (1);
              stack.Install (nodes_net3LAN[z][i][j]);
              nodes_net3LAN[z][i][j].Add (nodes_net3[z][i+4].Get (0));
              ndc3LAN[i][j] = p2p_100mb1ms.Install (nodes_net3LAN[z][i][j]);
              ifs3LAN[z][i][j] = address.Assign (ndc3LAN[i][j]);
            }
        }
      cout << "  Connecting Subnets..." << endl;
      // Create Lone Routers (Node 4 & 5) 
      nodes_netLR[z].Create (2);
      stack.Install (nodes_netLR[z]);
      NetDeviceContainer ndcLR;
      ndcLR = p2p_1gb5ms.Install (nodes_netLR[z]);
      // Connect Net2/Net3 through Lone Routers to Net0
      NodeContainer net0_4, net0_5, net2_4a, net2_4b, net3_5a, net3_5b;
      net0_4.Add (nodes_netLR[z].Get (0));
      net0_4.Add (nodes_net0[z][0].Get (0));
      net0_5.Add (nodes_netLR[z].Get  (1));
      net0_5.Add (nodes_net0[z][1].Get (0));
      net2_4a.Add (nodes_netLR[z].Get (0));
      net2_4a.Add (nodes_net2[z][0].Get (0));
      net2_4b.Add (nodes_netLR[z].Get (1));
      net2_4b.Add (nodes_net2[z][1].Get (0));
      net3_5a.Add (nodes_netLR[z].Get (1));
      net3_5a.Add (nodes_net3[z][0].Get (0));
      net3_5b.Add (nodes_netLR[z].Get (1));
      net3_5b.Add (nodes_net3[z][1].Get (0));
      NetDeviceContainer ndc0_4, ndc0_5, ndc2_4a, ndc2_4b, ndc3_5a, ndc3_5b;
      ndc0_4 = p2p_1gb5ms.Install (net0_4);
      oss.str ("");
      oss << 10 + z << ".1.253.0";
      address.SetBase (oss.str ().c_str (), "255.255.255.0");
      ifs = address.Assign (ndc0_4);
      ndc0_5 = p2p_1gb5ms.Install (net0_5);
      oss.str ("");
      oss << 10 + z << ".1.254.0";
      address.SetBase (oss.str ().c_str (), "255.255.255.0");
      ifs = address.Assign (ndc0_5);
      ndc2_4a = p2p_1gb5ms.Install (net2_4a);
      oss.str ("");
      oss << 10 + z << ".4.253.0";
      address.SetBase (oss.str ().c_str (), "255.255.255.0");
      ifs = address.Assign (ndc2_4a);
      ndc2_4b = p2p_1gb5ms.Install (net2_4b);
      oss.str ("");
      oss << 10 + z << ".4.254.0";
      address.SetBase (oss.str ().c_str (), "255.255.255.0");
      ifs = address.Assign (ndc2_4b);
      ndc3_5a = p2p_1gb5ms.Install (net3_5a);
      oss.str ("");
      oss << 10 + z << ".5.253.0";
      address.SetBase (oss.str ().c_str (), "255.255.255.0");
      ifs = address.Assign (ndc3_5a);
      ndc3_5b = p2p_1gb5ms.Install (net3_5b);
      oss.str ("");
      oss << 10 + z << ".5.254.0";
      address.SetBase (oss.str ().c_str (), "255.255.255.0");
      ifs = address.Assign (ndc3_5b);
      // Assign IP addresses
      cout << "  Assigning IP addresses..." << endl;
      for (int i = 0; i < 3; ++i) 
        {
          oss.str ("");
          oss << 10 + z << ".1." << 1 + i << ".0";
          address.SetBase (oss.str ().c_str (), "255.255.255.0");
          ifs0[z][i] = address.Assign (ndc0[i]);
        }
      for (int i = 0; i < 6; ++i) 
        {
          if (i == 1) 
            {
              continue;
            }
          oss.str ("");
          oss << 10 + z << ".2." << 1 + i << ".0";
          address.SetBase (oss.str ().c_str (), "255.255.255.0");
          ifs1[z][i] = address.Assign (ndc1[i]);
        }
      oss.str ("");
      oss << 10 + z << ".3.1.0";
      address.SetBase (oss.str ().c_str (), "255.255.255.0");
      ifs = address.Assign (ndcLR);
      for (int i = 0; i < 14; ++i) 
        {
          oss.str ("");
          oss << 10 + z << ".4." << 1 + i << ".0";
          address.SetBase (oss.str ().c_str (), "255.255.255.0");
          ifs2[z][i] = address.Assign (ndc2[i]);
        }
      for (int i = 0; i < 9; ++i) 
        {
          oss.str ("");
          oss << 10 + z << ".5." << 1 + i << ".0";
          address.SetBase (oss.str ().c_str (), "255.255.255.0");
          ifs3[z][i] = address.Assign (ndc3[i]);
        }
    }
    // Create Ring Links
  if (nCN > 1) 
    {
      cout << "Forming Ring Topology..." << endl;
      NodeContainer nodes_ring[nCN];
      for (int z = 0; z < nCN-1; ++z) 
        {
          nodes_ring[z].Add (nodes_net0[z][0].Get (0));
          nodes_ring[z].Add (nodes_net0[z+1][0].Get (0));
        }
      nodes_ring[nCN-1].Add (nodes_net0[nCN-1][0].Get (0));
      nodes_ring[nCN-1].Add (nodes_net0[0][0].Get (0));
      NetDeviceContainer ndc_ring[nCN];
      for (int z = 0; z < nCN; ++z) 
        {
          ndc_ring[z] = p2p_2gb200ms.Install (nodes_ring[z]);
          oss.str ("");
          oss << "254.1." << z + 1 << ".0";
          address.SetBase (oss.str ().c_str (), "255.255.255.0");
          ifs = address.Assign (ndc_ring[z]);
        }
    }

  // Create Traffic Flows
  cout << "Creating TCP Traffic Flows:" << endl;
  Config::SetDefault ("ns3::OnOffApplication::MaxBytes", UintegerValue (500000));
  Config::SetDefault ("ns3::OnOffApplication::OnTime",
      RandomVariableValue (ConstantVariable (1)));
  Config::SetDefault ("ns3::OnOffApplication::OffTime",
      RandomVariableValue (ConstantVariable (0)));
  Config::SetDefault ("ns3::TcpSocket::SegmentSize", UintegerValue (512));
  
  UniformVariable urng;
  int r1;
  double r2;
  for (int z = 0; z < nCN; ++z) 
    {
      int x = z + 1;
      if (z == nCN - 1) 
        {
          x = 0;
        }
      // Subnet 2 LANs
      cout << "  Campus Network " << z << " Flows [ Net2 ";
      for (int i = 0; i < 7; ++i) 
        {
          for (int j = 0; j < nLANClients; ++j) 
            {
              // Sinks
              PacketSinkHelper sinkHelper ("ns3::TcpSocketFactory",
                  InetSocketAddress (Ipv4Address::GetAny (), 9999));
              ApplicationContainer sinkApp = sinkHelper.Install (
                  nodes_net2LAN[z][i][j].Get (0));
              sinkApp.Start (Seconds (0.0));
              // Sources
              r1 = 2 + (int)(4 * urng.GetValue ());
              r2 = 10 * urng.GetValue ();
              OnOffHelper client ("ns3::TcpSocketFactory", Address ());
              AddressValue remoteAddress(InetSocketAddress (
                  ifs2LAN[z][i][j].GetAddress (0), 9999));
            client.SetAttribute ("Remote", remoteAddress);
            ApplicationContainer clientApp;
            clientApp.Add (client.Install (nodes_net1[x][r1].Get (0)));
            clientApp.Start (Seconds (r2));
          }
        }
      // Subnet 3 LANs
      cout << "Net3 ]" << endl;
      for (int i = 0; i < 5; ++i) 
        {
          for (int j = 0; j < nLANClients; ++j) 
            {
              // Sinks
              PacketSinkHelper sinkHelper ("ns3::TcpSocketFactory",
                  InetSocketAddress (Ipv4Address::GetAny (), 9999));
              ApplicationContainer sinkApp = sinkHelper.Install (
                  nodes_net3LAN[z][i][j].Get (0));
              sinkApp.Start (Seconds (0.0));
              // Sources
              r1 = 2 + (int)(4 * urng.GetValue ());
              r2 = 10 * urng.GetValue ();
              OnOffHelper client ("ns3::TcpSocketFactory", Address ());
              AddressValue remoteAddress (InetSocketAddress (
                  ifs3LAN[z][i][j].GetAddress (0), 9999));
              client.SetAttribute ("Remote", remoteAddress);
              ApplicationContainer clientApp;
              clientApp.Add (client.Install (nodes_net1[x][r1].Get (0)));
              clientApp.Start (Seconds (r2));
            }
        }
    }

  cout << "Created " << NodeList::GetNNodes () << " nodes." << endl;
  TIMER_TYPE routingStart;
  TIMER_NOW (routingStart);

  if (nix)
    {
      // Calculate routing tables
      cout << "Using Nix-vectors..." << endl;
    }
  else
    {
      // Calculate routing tables
      cout << "Populating Global Static Routing Tables..." << endl;
      Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
    }

  TIMER_TYPE routingEnd;
  TIMER_NOW (routingEnd);
  cout << "Routing tables population took " 
       << TIMER_DIFF (routingEnd, routingStart) << endl;

  Simulator::ScheduleNow (Progress);
  cout << "Running simulator..." << endl;
  TIMER_NOW (t1);
  Simulator::Stop (Seconds (100.0));
  Simulator::Run ();
  TIMER_NOW (t2);
  cout << "Simulator finished." << endl;
  Simulator::Destroy ();

  double d1 = TIMER_DIFF (t1, t0), d2 = TIMER_DIFF (t2, t1);
  cout << "-----" << endl << "Runtime Stats:" << endl;
  cout << "Simulator init time: " << d1 << endl;
  cout << "Simulator run time: " << d2 << endl;
  cout << "Total elapsed time: " << d1+d2 << endl;
  return 0;
}
