/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2015 LIPTEL.ieee.org
 *
 * 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: Miralem Mehic <miralem.mehic@ieee.org>
 */


// Network topology
//
//       n0 ---p2p-- n1 --p2p-- n2
//        |---------qkd---------|
//
// - udp flows from n0 to n2

#include <fstream>
#include "ns3/core-module.h" 
#include "ns3/applications-module.h"
#include "ns3/internet-module.h" 
#include "ns3/flow-monitor-module.h" 
#include "ns3/mobility-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/gnuplot.h" 

#include "ns3/qkd-helper.h" 
#include "ns3/qkd-app-charging-helper.h"
#include "ns3/qkd-send.h"

#include "ns3/aodv-module.h" 
#include "ns3/olsr-module.h"
#include "ns3/dsdv-module.h"
 
#include "ns3/network-module.h"
#include "ns3/fd-net-device-module.h"
#include "ns3/internet-apps-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("QKD_CHANNEL_TEST");
   
uint32_t m_bytes_total = 0; 
uint32_t m_bytes_received = 0; 
uint32_t m_bytes_sent = 0; 
uint32_t m_packets_received = 0; 
double m_time = 0;

void
SentPacket(std::string context, Ptr<const Packet> p){

    m_bytes_sent += p->GetSize();  
}

void
ReceivedPacket(std::string context, Ptr<const Packet> p, const Address& addr){
     
    m_bytes_received += p->GetSize(); 
    m_bytes_total += p->GetSize(); 
    m_packets_received++;

}

void
Ratio(uint32_t m_bytes_sent, uint32_t m_packets_sent ){
    std::cout << "Sent (bytes):\t" <<  m_bytes_sent
    << "\tReceived (bytes):\t" << m_bytes_received 
    << "\nSent (Packets):\t" <<  m_packets_sent
    << "\tReceived (Packets):\t" << m_packets_received 
    
    << "\nRatio (bytes):\t" << (float)m_bytes_received/(float)m_bytes_sent
    << "\tRatio (packets):\t" << (float)m_packets_received/(float)m_packets_sent << "\n";
}

 
int main (int argc, char *argv[])
{
    Packet::EnablePrinting(); 
    PacketMetadata::Enable ();
    //
    // Explicitly create the nodes required by the topology (shown above).
    //
    NS_LOG_INFO ("Create nodes.");
    NodeContainer n;
    n.Create (3); 

    NodeContainer n0n1 = NodeContainer (n.Get(0), n.Get (1));
    NodeContainer n1n2 = NodeContainer (n.Get(1), n.Get (2)); 

    //Enable OLSR
    //AodvHelper routingProtocol;
    //OlsrHelper routingProtocol;
    DsdvHelper routingProtocol; 
      
    InternetStackHelper internet;
    internet.SetRoutingHelper (routingProtocol);
    internet.Install (n);

    // Set Mobility for all nodes
    MobilityHelper mobility;
    Ptr<ListPositionAllocator> positionAlloc = CreateObject <ListPositionAllocator>();
    positionAlloc ->Add(Vector(0, 200, 0)); // node0 
    positionAlloc ->Add(Vector(200, 200, 0)); // node1
    positionAlloc ->Add(Vector(400, 200, 0)); // node2 
    mobility.SetPositionAllocator(positionAlloc);
    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
    mobility.Install(n);
       
    // We create the channels first without any IP addressing information
    NS_LOG_INFO ("Create channels.");
    PointToPointHelper p2p;
    p2p.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
    p2p.SetChannelAttribute ("Delay", StringValue ("2ms")); 

    NetDeviceContainer d0d1 = p2p.Install (n0n1); 
    NetDeviceContainer d1d2 = p2p.Install (n1n2);
 
    //
    // We've got the "hardware" in place.  Now we need to add IP addresses.
    // 
    NS_LOG_INFO ("Assign IP Addresses.");
    Ipv4AddressHelper ipv4;

    ipv4.SetBase ("10.1.1.0", "255.255.255.0");
    Ipv4InterfaceContainer i0i1 = ipv4.Assign (d0d1);

    ipv4.SetBase ("10.1.2.0", "255.255.255.0");
    Ipv4InterfaceContainer i1i2 = ipv4.Assign (d1d2);
     
    //
    // Explicitly create the channels required by the topology (shown above).
    //
    //  install QKD Managers on the nodes 
    QKDHelper QHelper;  
    QHelper.InstallQKDManager (n); 
 

    //create QKD connection between nodes 0 and 1 
    NetDeviceContainer qkdNetDevices01 = QHelper.InstallQKD (
        d0d1.Get(0), d0d1.Get(1),
        1048576,    //min
        11324620, //thr
        52428800,   //max
        52428800     //current    //20485770
    );
   
    //Create graph to monitor buffer changes
    QHelper.AddGraph(n.Get(0), d0d1.Get(0)); //srcNode, destinationAddress, BufferTitle
 

    //create QKD connection between nodes 1 and 2 
    NetDeviceContainer qkdNetDevices12 = QHelper.InstallQKD (
        d1d2.Get(0), d1d2.Get(1),
        1048576,    //min
        11324620, //thr
        52428800,   //max
        52428800     //current    //20485770
    );
    
    //Create graph to monitor buffer changes
    QHelper.AddGraph(n.Get(1), d0d1.Get(0)); //srcNode, destinationAddress, BufferTitle

    NS_LOG_INFO ("Create Applications.");

    std::cout << "Source IP address: " << i0i1.GetAddress(0) << std::endl;
    std::cout << "Destination IP address: " << i1i2.GetAddress(1) << std::endl;

    /* QKD APPs for charing  */
    QKDAppChargingHelper qkdChargingApp("ns3::TcpSocketFactory", i0i1.GetAddress(0),  i0i1.GetAddress(1), 3072000);
    ApplicationContainer qkdChrgApps = qkdChargingApp.Install ( d0d1.Get(0), d0d1.Get(1) );
    qkdChrgApps.Start (Seconds (5.));
    qkdChrgApps.Stop (Seconds (1500.)); 

    QKDAppChargingHelper qkdChargingApp12("ns3::TcpSocketFactory", i1i2.GetAddress(0),  i1i2.GetAddress(1), 3072000);
    ApplicationContainer qkdChrgApps12 = qkdChargingApp12.Install ( d1d2.Get(0), d1d2.Get(1) );
    qkdChrgApps12.Start (Seconds (5.));
    qkdChrgApps12.Stop (Seconds (1500.)); 
    
   
    /* Create user's traffic between v0 and v1 */
    /* Create sink app */
    uint16_t sinkPort = 8080;
    QKDSinkAppHelper packetSinkHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), sinkPort));
    ApplicationContainer sinkApps = packetSinkHelper.Install (n.Get (2));
    sinkApps.Start (Seconds (25.));
    sinkApps.Stop (Seconds (300.));
    
    /* Create source app  */
    Address sinkAddress (InetSocketAddress (i1i2.GetAddress(1), sinkPort));
    Address sourceAddress (InetSocketAddress (i0i1.GetAddress(0), sinkPort));
    Ptr<Socket> socket = Socket::CreateSocket (n.Get (0), UdpSocketFactory::GetTypeId ());
 
    Ptr<QKDSend> app = CreateObject<QKDSend> ();
    app->Setup (socket, sourceAddress, sinkAddress, 640, 5, DataRate ("160kbps"));
    n.Get (0)->AddApplication (app);
    app->SetStartTime (Seconds (25.));
    app->SetStopTime (Seconds (300.));
  
    //////////////////////////////////////
    ////         STATISTICS
    //////////////////////////////////////

    //if we need we can create pcap files
    p2p.EnablePcapAll ("QKD_channel_test");  

    Config::Connect("/NodeList/*/ApplicationList/*/$ns3::QKDSend/Tx", MakeCallback(&SentPacket));
    Config::Connect("/NodeList/*/ApplicationList/*/$ns3::QKDSink/Rx", MakeCallback(&ReceivedPacket));
 
    Simulator::Stop (Seconds (50));
    Simulator::Run ();

    Ratio(app->sendDataStats(), app->sendPacketStats());
 
    //Finally print the graphs
    QHelper.PrintGraphs();
    Simulator::Destroy ();
}