/* -*- 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 "ns3/core-module.h"

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

#include "ns3/network-module.h"

#include "ns3/applications-module.h"

#include "ns3/wifi-module.h"

#include "ns3/mobility-module.h"

#include "ns3/csma-module.h"

#include "ns3/internet-module.h"

// Default Network Topology

//

// Number of wifi or csma nodes can be increased up to 250

//                          |

//                 Rank 0   |   Rank 1

// -------------------------|----------------------------

//   Wifi 10.1.3.0

//                 AP

//  *    *    *    *

//  |    |    |    |    10.1.1.0

// n5   n6   n7   n0 -------------- n1   n2   n3   n4

//                   point-to-point  |    |    |    |

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

//                                     LAN 10.1.2.0

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("ThirdScriptExample");

int 

main (int argc, char *argv[])

{

  bool verbose = true;

  uint32_t nCsma = 3;

  uint32_t nWifi = 3;

  bool tracing = false;

  CommandLine cmd;

  cmd.AddValue ("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma);

  cmd.AddValue ("nWifi", "Number of wifi STA devices", nWifi);

  cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose);

  cmd.AddValue ("tracing", "Enable pcap tracing", tracing);

  cmd.Parse (argc,argv);

  // Check for valid number of csma or wifi nodes

  // 250 should be enough, otherwise IP addresses 

  // soon become an issue

  if (nWifi > 250 || nCsma > 250)

    {

      std::cout << "Too many wifi or csma nodes, no more than 250 each." << std::endl;

      return 1;

    }

  if (verbose)

    {

      LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);

      LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);

    }

  NodeContainer p2pNodes;

  p2pNodes.Create (2);

  PointToPointHelper pointToPoint;

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

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

  NetDeviceContainer p2pDevices;

  p2pDevices = pointToPoint.Install (p2pNodes);

  NodeContainer csmaNodes;

  csmaNodes.Add (p2pNodes.Get (1));

  csmaNodes.Create (nCsma);

  CsmaHelper csma;

  csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps"));

  csma.SetChannelAttribute ("Delay", TimeValue (NanoSeconds (6560)));

  NetDeviceContainer csmaDevices;

  csmaDevices = csma.Install (csmaNodes);

  NodeContainer wifiStaNodes;

  wifiStaNodes.Create (nWifi);

  NodeContainer wifiApNode = p2pNodes.Get (0);

  YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();

  YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();

  phy.SetChannel (channel.Create ());

  WifiHelper wifi = WifiHelper::Default ();

  wifi.SetRemoteStationManager ("ns3::AarfWifiManager");

  NqosWifiMacHelper mac = NqosWifiMacHelper::Default ();

  Ssid ssid = Ssid ("ns-3-ssid");

  mac.SetType ("ns3::StaWifiMac",

               "Ssid", SsidValue (ssid),

               "ActiveProbing", BooleanValue (false));

  NetDeviceContainer staDevices;

  staDevices = wifi.Install (phy, mac, wifiStaNodes);

  mac.SetType ("ns3::ApWifiMac",

               "Ssid", SsidValue (ssid));

  NetDeviceContainer apDevices;

  apDevices = wifi.Install (phy, mac, wifiApNode);

  MobilityHelper mobility;

  mobility.SetPositionAllocator ("ns3::GridPositionAllocator",

                                 "MinX", DoubleValue (0.0),

                                 "MinY", DoubleValue (0.0),

                                 "DeltaX", DoubleValue (5.0),

                                 "DeltaY", DoubleValue (10.0),

                                 "GridWidth", UintegerValue (3),

                                 "LayoutType", StringValue ("RowFirst"));

  mobility.SetMobilityModel ("ns3::RandomWalk2dMobilityModel",

                             "Bounds", RectangleValue (Rectangle (-50, 50, -50, 50)));

  mobility.Install (wifiStaNodes);

  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");

  mobility.Install (wifiApNode);

  InternetStackHelper stack;

  stack.Install (csmaNodes);

  stack.Install (wifiApNode);

  stack.Install (wifiStaNodes);

  Ipv4AddressHelper address;

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

  Ipv4InterfaceContainer p2pInterfaces;

  p2pInterfaces = address.Assign (p2pDevices);

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

  Ipv4InterfaceContainer csmaInterfaces;

  csmaInterfaces = address.Assign (csmaDevices);

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

  address.Assign (staDevices);

  address.Assign (apDevices);

  UdpEchoServerHelper echoServer (9);

  ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma));

  serverApps.Start (Seconds (1.0));

  serverApps.Stop (Seconds (10.0));

  UdpEchoClientHelper echoClient (csmaInterfaces.GetAddress (nCsma), 9);

  echoClient.SetAttribute ("MaxPackets", UintegerValue (1));

  echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));

  echoClient.SetAttribute ("PacketSize", UintegerValue (1024));

  ApplicationContainer clientApps = 

    echoClient.Install (wifiStaNodes.Get (nWifi - 1));

  clientApps.Start (Seconds (2.0));

  clientApps.Stop (Seconds (10.0));

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Simulator::Stop (Seconds (10.0));

  if (tracing == true)

    {

      pointToPoint.EnablePcapAll ("third");

      phy.EnablePcap ("third", apDevices.Get (0));

      csma.EnablePcap ("third", csmaDevices.Get (0), true);

    }

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}