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

/*

 * Copyright (c) 2012 NICT

 *

 * 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: Hajime Tazaki <tazaki@nict.go.jp>

 */

#include "ns3/log.h"

#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/dce-module.h"

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

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("DceFirst");

std::string m_stack = "dce";

std::string sock_factory = "ns3::LinuxTcpSocketFactory";

int m_seed = 1;

double startTime = 4.0;

double stopTime = 20.0;

int m_nNodes = 2;

bool enablePcap = false;

std::string m_pktSize = "1024";

bool m_frag = false;

bool m_bulk = false;

int

main (int argc, char *argv[])

{

  // LogComponentEnable ("OnOffApplication", LOG_LEVEL_INFO);

  // LogComponentEnable ("PacketSink", LOG_LEVEL_INFO);

  CommandLine cmd;

  cmd.AddValue ("stack", "choose network stack", m_stack);

  cmd.AddValue ("seed", "randomize seed", m_seed);

  cmd.AddValue ("nNodes", "the number of nodes in left side", m_nNodes);

  cmd.AddValue ("stopTime", "duration", stopTime);

  cmd.AddValue ("enablePcap", "pcap", enablePcap);

  cmd.AddValue ("pktSize", "packet size", m_pktSize);

  cmd.AddValue ("frag", "fragment", m_frag);

  cmd.AddValue ("bulk", "use BulkSendApp instead of OnOffApp", m_bulk);

  cmd.Parse (argc, argv);

  SeedManager::SetSeed (m_seed);

  NodeContainer lefts, routers, rights, nodes;

  lefts.Create (m_nNodes);

  routers.Create (2);

  rights.Create (m_nNodes);

  nodes = NodeContainer (lefts, routers, rights);

  DceManagerHelper dceManager;

  LinuxStackHelper stack;

  InternetStackHelper internetStack;

  GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));

  if (m_stack == "dce")

    {

      //      internetStack.Install (routers);

      sock_factory = "ns3::LinuxTcpSocketFactory";

      dceManager.SetNetworkStack ("ns3::LinuxSocketFdFactory",

                                  "Library", StringValue ("liblinux.so"));

      stack.Install (routers);

      stack.Install (lefts);

      stack.Install (rights);

    }

  else if (m_stack == "dce-linux3")

    {

      //internetStack.Install (routers);

      dceManager.SetNetworkStack ("ns3::LinuxSocketFdFactory",

                                  "Library", StringValue ("liblinux-stable.so"));

      stack.Install (lefts);

      stack.Install (rights);

      stack.Install (routers);

    }

  else if (m_stack == "dce-dccp")

    {

      dceManager.SetNetworkStack ("ns3::LinuxSocketFdFactory",

                                  "Library", StringValue ("liblinux.so"));

      sock_factory = "ns3::LinuxDccpSocketFactory";

      stack.Install (routers);

      stack.Install (lefts);

      stack.Install (rights);

    }

  else if (m_stack == "dce-dccp3")

    {

      internetStack.Install (routers);

      dceManager.SetNetworkStack ("ns3::LinuxSocketFdFactory",

                                  "Library", StringValue ("liblinux-stable.so"));

      sock_factory = "ns3::LinuxDccpSocketFactory";

      stack.Install (lefts);

      stack.Install (rights);

    }

  else if (m_stack == "ns3")

    {

      // Thx, Brian !

      Config::SetDefault ("ns3::TcpSocket::SegmentSize", UintegerValue (1448));

      Config::SetDefault ("ns3::TcpSocket::DelAckCount", UintegerValue (1));

      sock_factory = "ns3::TcpSocketFactory";

      internetStack.Install (nodes);

    }

  else if (m_stack == "nsc-linux")

    {

      internetStack.Install (routers);

      sock_factory = "ns3::TcpSocketFactory";

      internetStack.SetTcp ("ns3::NscTcpL4Protocol",

                            "Library", StringValue ("liblinux2.6.26.so"));

      internetStack.Install (lefts);

      internetStack.Install (rights);

      // Config::Set ("/NodeList/*/$ns3::Ns3NscStack<linux2.6.26>/net.ipv4.tcp_congestion_control",

      //              StringValue ("reno"));

    }

  else if (m_stack == "nsc-freebsd")

    {

      // didn't work under 64bit (12/11/13)

      sock_factory = "ns3::TcpSocketFactory";

      internetStack.SetTcp ("ns3::NscTcpL4Protocol",

                            "Library", StringValue ("libfreebsd5.3.so"));

      internetStack.Install (nodes);

    }

  else

    {

      NS_ASSERT_MSG (0, "no stack " << m_stack << " is available");

    }

  PointToPointHelper pointToPoint;

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

  pointToPoint.SetChannelAttribute ("Delay", StringValue ("1ns"));

  Ipv4AddressHelper address;

  Ipv4InterfaceContainer interfaces;

  NetDeviceContainer dev0, dev1, dev2;

  for (uint32_t i = 0; i < m_nNodes; i++)

    {

      std::ostringstream oss;

      oss << "10.0." << i << ".0";

      address.SetBase (oss.str ().c_str (), "255.255.255.0");

      dev0 = pointToPoint.Install (NodeContainer (lefts.Get (i), routers.Get (0)));

      address.Assign (dev0);

    }

  // bottle neck link

  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("2Mbps"));

  pointToPoint.SetChannelAttribute ("Delay", StringValue ("100ms"));

  dev1 = pointToPoint.Install (NodeContainer (routers.Get (0), routers.Get (1)));

  if (m_frag)

    {

      dev1.Get (0)->SetMtu (1000);

      dev1.Get (1)->SetMtu (1000);

    }

  // bottle neck link

  Ptr<RateErrorModel> em1 =

                                                "ErrorRate", DoubleValue (0.05),

                                                "ErrorUnit", EnumValue (RateErrorModel::ERROR_UNIT_PACKET)

                                                );

  dev1.Get (1)->SetAttribute ("ReceiveErrorModel", PointerValue (em1));

  address.SetBase ("10.1.0.0", "255.255.255.0");

  address.Assign (dev1);

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

  pointToPoint.SetChannelAttribute ("Delay", StringValue ("1ns"));

  // for right links

  for (uint32_t i = 0; i < m_nNodes; i++)

    {

      std::ostringstream oss;

      oss << "10.2." << i << ".0";

      address.SetBase (oss.str ().c_str (), "255.255.255.0");

      dev2 = pointToPoint.Install (NodeContainer (routers.Get (1), rights.Get (i)));

      address.Assign (dev2);

    }

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  if (m_stack.find ("dce") != std::string::npos)

    {

      LinuxStackHelper::PopulateRoutingTables ();

      dceManager.Install (nodes);

      stack.SysctlSet (nodes, ".net.ipv4.conf.default.forwarding", "1");

    }

  // dceManager.RunIp (lefts.Get (0), Seconds (0.2), "route add default via 10.0.0.2");

  // dceManager.RunIp (lefts.Get (1), Seconds (0.2), "route add default via 10.0.1.2");

  // dceManager.RunIp (routers.Get (0), Seconds (0.2), "route add 10.2.0.0/16 via 10.1.0.2");

  // dceManager.RunIp (routers.Get (1), Seconds (0.2), "route add 10.0.0.0/16 via 10.1.0.1");

  // dceManager.RunIp (routers.Get (1), Seconds (0.2), "route show");

  // dceManager.RunIp (routers.Get (1), Seconds (0.2), "link set lo up");

  // dceManager.RunIp (rights.Get (0), Seconds (0.2), "route add 0.0.0.0/0 via 10.2.0.1");

  // dceManager.RunIp (rights.Get (1), Seconds (0.2), "route add default via 10.2.1.1");

  // dceManager.RunIp (rights.Get (0), Seconds (0.2), "route show");

  ApplicationContainer apps;

  DceApplicationHelper process;

  OnOffHelper onoff = OnOffHelper (sock_factory,

                                   InetSocketAddress (Ipv4Address ("10.2.0.2"), 2000));

  onoff.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));

  onoff.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));

  onoff.SetAttribute ("PacketSize", StringValue (m_pktSize));

  onoff.SetAttribute ("DataRate", StringValue ("1Mbps"));

  BulkSendHelper bulk = BulkSendHelper (sock_factory,

                                        InetSocketAddress ("10.2.0.2", 2000));

  // Set the amount of data to send in bytes.  Zero is unlimited.

  bulk.SetAttribute ("MaxBytes", UintegerValue (0));

  bulk.SetAttribute ("SendSize", UintegerValue (atoi (m_pktSize.c_str ())));

  // Flow 1 - n

  for (uint32_t i = 0; i < m_nNodes; i++)

    {

      std::ostringstream oss;

      oss << "10.2." << i << ".2";

      if (!m_bulk)

        {

          onoff.SetAttribute ("Remote", 

                              AddressValue (InetSocketAddress (Ipv4Address (oss.str ().c_str ()), 2000)));

          onoff.SetAttribute ("StartTime", TimeValue (Seconds (startTime)));

          apps = onoff.Install (lefts.Get (i));

        }

      else

        {

          bulk.SetAttribute ("Remote", 

                             AddressValue (InetSocketAddress (Ipv4Address (oss.str ().c_str ()), 2000)));

          apps = bulk.Install (lefts.Get (i));

          apps.Start (Seconds (startTime));

        }

    }

  PacketSinkHelper sink = PacketSinkHelper (sock_factory,

                                            InetSocketAddress (Ipv4Address::GetAny (), 2000));

  apps = sink.Install (rights);

  apps.Start (Seconds (3.9999));

  if (enablePcap)

    {

      pointToPoint.EnablePcapAll ("dce-tcp-comparison");

    }

  Simulator::Stop (Seconds (stopTime));

  Simulator::Run ();

  Ptr<PacketSink> pktsink;

  uint64_t total = 0;

  std::cout << "Total ";

  for (uint32_t i = 0; i < m_nNodes; i++)

    {

      pktsink = apps.Get (i)->GetObject<PacketSink> ();

      std::cout << "Rx(" << i << ") = " << pktsink->GetTotalRx ()

                << " bytes ("

                << pktsink->GetTotalRx () * 8 / (stopTime - startTime)

                << " bps), ";

      total += pktsink->GetTotalRx () ;

    }

  std::cout << " total = " << total * 8 / (stopTime - startTime) << " bps";

  std::cout << std::endl;

  Simulator::Destroy ();

  return 0;

}