/* -*- 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"
#include "ns3/olsr-helper.h"
#include "ns3/ipv4-static-routing-helper.h"
#include "ns3/ipv4-list-routing-helper.h"
#include "ns3/config-store-module.h"
#include "ns3/packet-sink-helper.h"
#include "ns3/onoff-application.h"
#include "ns3/flow-monitor-module.h"



// Default Network Topology
//
//   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;
using namespace std;
#include<iostream>
#include<fstream>
#include <cmath>
#include <functional>
#include <cstdlib>
#include <string>
#include <ctime>
#include <sstream>  
#include <vector>

#include "ns3/gnuplot.h"



NS_LOG_COMPONENT_DEFINE ("ThirdScriptExample");

/* for the netanim
void
CourseChange (string context, Ptr<const MobilityModel> model)
{
Vector position = model->GetPosition ();
NS_LOG_UNCOND (context <<
" x = " << position.x << ", y = " << position.y);
}

*/

/// selfish node specification , the min and max cw will be change 


// modify the CW min 
void SetCwMin(uint16_t cw)
{
   Config::Set("/NodeList/0/DeviceList/0/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/DcaTxop/CwMin", UintegerValue(cw));

}

/*
// modify the CW max 
void SetCwMax(uint16_t cw)
{
   Config::Set("/NodeList/0/DeviceList/0/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/DcaTxop/CwMax", UintegerValue(cw));
}
*/



uint32_t totalBytesReceived(0), mbs (0);
//uint32_t mbs (0);
ofstream rdTrace;
int const TN= 4;
//vector <uint32_t> totalBytesReceived(TN);
 //vector <double> mbs(TN);



//-- Callback function is called whenever a packet is received successfully.
//-- This function cumulatively add the size of data packet to totalBytesReceived counter.
//---------------------------------------------------------------------------------------
	void
	ReceivePacket(string context, Ptr <const Packet> p)
	{

		//char c= context.at(10);
		//int index= c - '0';
	    //totalBytesReceived[index] += p->GetSize();
		totalBytesReceived += p->GetSize();
		//cout<< "this is the context : " << context.at(10)<< endl;
	   //cout<< "this is the context : " << totalBytesReceived[0] << endl;
	}

void
CalculateThroughput()
{

  //for (int f=0; f<TN; f++)
	//{
  double mbs = ((totalBytesReceived*8.0)/100000);
   //mbs[f] = ((totalBytesReceived[f]*8.0)/100000);

  totalBytesReceived =0;
 // rdTrace << Simulator::Now ().GetSeconds() << "\t"<< f << "\t" << mbs[f] <<"\n";
    rdTrace << Simulator::Now ().GetSeconds() << "\t"<< "\t" << mbs <<"\n";

		//}
    Simulator::Schedule (Seconds (0.1), &CalculateThroughput);

}


int main (int argc, char *argv[])
{

string phyMode ("DsssRate11Mbps");
cout<<"phyMode is "<<phyMode<<std::endl;

bool verbose = true;
uint32_t nWifi = 4;
bool tracing = false;



CommandLine cmd;
cmd.AddValue ("nWifi", "Number of wifi STA devices", nWifi);
cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose);

cmd.Parse (argc,argv);

  if (verbose)
    {
      LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);
      LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);
	   // LogComponentEnable ("DcaTxop", LOG_LEVEL_ALL);

    }

  
  rdTrace.open("throughputmeasurementstestEST0.dat", ios::out);                                             //
  rdTrace << "# Time \t Throughput \n";


  // create the nodes 
NS_LOG_INFO ("Create nodes.");
NodeContainer wifiStaNodes; // create the nodes that will be part of the wifi network
wifiStaNodes.Create (nWifi); // nwifi= 20

// set up the wifi channel 

 // physical specifications

WifiHelper wifi = WifiHelper::Default (); //*helps to create WifiNetDevice objects:* 1-This class can help to create a large set of similar WifiNetDevice objects 
   //and* 2-to configure a large set of their attributes during creation.
YansWifiPhyHelper phy = YansWifiPhyHelper::Default (); // physical 
phy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO); // ns-3 supports RadioTap and Prism tracing extensions for 802.11b
  // ns-3 supports RadioTap and Prism tracing extensions for 802.11b
phy.Set("TxGain", DoubleValue (20.0)); // Use 5.0 to extend range to about 300 meters 
phy.Set("RxGain", DoubleValue (20.0)); // Use 5.0 to extend range to about 300 meters


// crete the channel 
YansWifiChannelHelper wifichannel = YansWifiChannelHelper::Default (); // construct the wifi devices and the interconnection channel between the wifi nodes
wifichannel.SetPropagationDelay ("ns3::ConstantSpeedPropagationDelayModel"); // specify the propagtion delay
wifichannel.AddPropagationLoss("ns3::FriisPropagationLossModel"); // specify the propagtion model 
phy.SetChannel (wifichannel.Create ());

// create the mac parameters 
NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default (); // * \brief create non QoS-enabled MAC layers for a ns3::WifiNetDevice.

wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager", 
                                "DataMode",StringValue (phyMode), 
                                "ControlMode",StringValue (phyMode));

//wifi.SetRemoteStationManager ("ns3::AarfWifiManager");
wifi.SetStandard (WIFI_PHY_STANDARD_80211b);
wifiMac.SetType ("ns3::AdhocWifiMac"); // Set it to adhoc mode


NetDeviceContainer staDevices;   // It used to be the case that if you wanted to connect a computer to a network,ex:NIC
staDevices = wifi.Install (phy, wifiMac, wifiStaNodes);
// In ns-3 the net device abstraction covers both the software driver and the simulated hardware. A net device is “installed”
//in a Node in order to enable the Node to communicate with other Nodes in the simulation via Channels.
//Just as in a real computer, a Node may be connected to more than one Channel via multiple NetDevices.



  // assigning mobility to nodes

   MobilityHelper mobility;
 mobility.SetPositionAllocator
("ns3::GridPositionAllocator",
 "MinX", DoubleValue (0.0),
 "MinY", DoubleValue (0.0),
 "GridWidth", UintegerValue
(5),
 "LayoutType", StringValue
("RowFirst"));

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

 mobility.Install (wifiStaNodes);


// for routing / OLSR protocol
OlsrHelper olsr;
//Ipv4StaticRoutingHelper staticRouting;
Ipv4ListRoutingHelper list;
//list.Add (staticRouting, 0);
list.Add (olsr, 10);

// setup the internet stack 
InternetStackHelper internet;
internet.SetRoutingHelper (list); // has effect on the next Install ()
internet.Install(wifiStaNodes);

  // assign IPv4 to devices 
Ipv4AddressHelper address;
NS_LOG_INFO ("Assign IP Addresses.");
address.SetBase ("10.1.1.0", "255.255.255.0");
Ipv4InterfaceContainer  interface ;
 interface = address.Assign (staDevices);




 /*
TypeId tid = TypeId::LookupByName
("ns3::UdpSocketFactory");

Ptr<Socket> recvSink = Socket::CreateSocket (wifiStaNodes.Get(sinkNode), tid);//


InetSocketAddress local = InetSocketAddress
(Ipv4Address::GetAny (), 80);
 recvSink->Bind (local);
 recvSink->SetRecvCallback (MakeCallback (&ReceivePacket));
 Ptr<Socket> source = Socket::CreateSocket (wifiStaNodes.Get(sourceNode), tid);
 InetSocketAddress remote = InetSocketAddress (interface.GetAddress(sinkNode, 0), 80);
 source->Connect (remote);
 if (tracing == true)
 {
 AsciiTraceHelper ascii;
 phy.EnableAsciiAll (ascii.CreateFileStream ("wifisimple-adhoc-grid.tr"));
 phy.EnablePcap ("wifi-simple-adhoc-grid",staDevices);
 // Trace routing tables
 Ptr<OutputStreamWrapper> routingStream = Create<OutputStreamWrapper> ("wifi-simple-adhocgrid.routes",std::ios::out);

 olsr.PrintRoutingTableAllEvery (Seconds (2),routingStream);

 }
 //UdpEchoServerHelper echoServer (9);

 */

 // create application (the on off applicatiopn )
 uint16_t port = 9;
 
 /*
 OnOffHelper onoff("ns3::UdpSocketFactory",InetSocketAddress("10.1.1.4", port));
//OnOffHelper onoffHelper ("ns3::UdpSocketFactory", InetSocketAddress (interface.Get(staDevices))); 
onoff.SetAttribute ("OnTime",  StringValue("ns3::ConstantRandomVariable[Constant=1]"));
onoff.SetAttribute ("OffTime",  StringValue("ns3::ConstantRandomVariable[Constant=0]"));
onoff.SetAttribute("DataRate", StringValue("512Kbps"));
onoff.SetAttribute("PacketSize", StringValue("512"));
ApplicationContainer apps = onoff.Install(wifiStaNodes);
apps.Start(Seconds(5.0));
apps.Stop(Seconds(20.0));

// create an application (the packet sink application)
PacketSinkHelper sink ("ns3::UdpSocketFactory",InetSocketAddress("10.1.1.4", port));
ApplicationContainer sinkApps= sink.Install(wifiStaNodes);
sinkApps.Start (Seconds (1.0));
sinkApps.Stop (Seconds (20.0));
*/

 int const N= 4; // number of nodes
 int m [N];
for (int i=0; i<nWifi;i++)
{

for (int j= 0; j<nWifi;j++)	
{
	if(i!=j)
	{
   m[i] = rand() % nWifi;// v1 in the range 0 to 19
	}

}

OnOffHelper onoff("ns3::UdpSocketFactory",InetSocketAddress(interface.GetAddress (i), port));
onoff.SetAttribute ("OnTime",  StringValue("ns3::ConstantRandomVariable[Constant=1]"));
onoff.SetAttribute ("OffTime",  StringValue("ns3::ConstantRandomVariable[Constant=0]"));
onoff.SetAttribute("DataRate", StringValue("2.4Mbps"));
onoff.SetAttribute("PacketSize", StringValue("1000"));
ApplicationContainer apps = onoff.Install(wifiStaNodes.Get(m[i]));
//ApplicationContainer apps = onoff.Install(wifiStaNodes.Get(4-i));

apps.Start(Seconds((0.1)*i));
apps.Stop(Seconds(150.0));



// create an application (the packet sink application)
PacketSinkHelper sink ("ns3::UdpSocketFactory",InetSocketAddress(interface.GetAddress (i), port));
ApplicationContainer sinkApps= sink.Install(wifiStaNodes.Get(i));
sinkApps.Start (Seconds ((0.1)*i));
sinkApps.Stop (Seconds (150.0));


  
  //-----------------------------------------------------
  //-- Connect MacRx event at MAC layer of sink node to ReceivePacket function
  //-- for throughput calculation.
  //-----------------------------------------------------
  
stringstream ST;
ST<<"/NodeList/"<< 0 <<"/DeviceList/*/$ns3::WifiNetDevice/Mac/MacRx";                 //
Config::Connect (ST.str(), MakeCallback(&ReceivePacket) ); 


}





// Tracing 
AsciiTraceHelper ascii;
phy.EnableAscii(ascii.CreateFileStream ("network.tr"), staDevices);
phy.EnablePcap("network", staDevices, false);

//phy.EnablePcapAll ("example");
//phy.EnablePcap ("example", p2pNodes.Get (0)->GetId (), 0);
//OnOffHelper onoffHelper ("ns3::UdpSocketFactory", InetSocketAddress (interfaces, port)); 
 // system("pause");



/*
// Calculate Throughput using Flowmonitor
 FlowMonitorHelper flowmon;
 Ptr<FlowMonitor> monitor = flowmon.InstallAll();
 */


// Now, do the actual simulation.

Simulator::Schedule(Seconds(20.0), &SetCwMin, 2); 
//Simulator::Schedule(Seconds(20.0), &SetCwMax, 2); 
Simulator::Schedule (Seconds(0.1),&CalculateThroughput);
Simulator::Stop (Seconds (155.0));	
Simulator::Run ();
Simulator::Destroy ();
  return 0;
}