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

/*

 * Copyright (c) 2005,2006,2007 INRIA

 *

 * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "ns3/core-module.h"

#include "ns3/common-module.h"

#include "ns3/node-module.h"

#include "ns3/helper-module.h"

#include "ns3/mobility-module.h"

#include "ns3/contrib-module.h"

#include "ns3/wifi-module.h"

#include "ns3/athstats-helper.h"

#include <iostream>

using namespace ns3;

void

DevTxTrace (std::string context, Ptr<const Packet> p)

{

  std::cout << " TX p: " << *p << std::endl;

}

void

DevRxTrace (std::string context, Ptr<const Packet> p)

{

  std::cout << " RX p: " << *p << std::endl;

}

void

PhyRxOkTrace (std::string context, Ptr<const Packet> packet, double snr, WifiMode mode, enum WifiPreamble preamble)

{

  std::cout << "PHYRXOK mode=" << mode << " snr=" << snr << " " << *packet << std::endl;

}

void

PhyRxErrorTrace (std::string context, Ptr<const Packet> packet, double snr)

{

  std::cout << "PHYRXERROR snr=" << snr << " " << *packet << std::endl;

}

void

PhyTxTrace (std::string context, Ptr<const Packet> packet, WifiMode mode, WifiPreamble preamble, uint8_t txPower)

{

  std::cout << "PHYTX mode=" << mode << " " << *packet << std::endl;

}

void

PhyStateTrace (std::string context, Time start, Time duration, enum WifiPhy::State state)

{

  std::cout << " state=";

  switch (state) {

  case WifiPhy::TX:

    std::cout << "tx      ";

    break;

  case WifiPhy::SYNC:

    std::cout << "sync    ";

    break;

  case WifiPhy::CCA_BUSY:

    std::cout << "cca-busy";

    break;

  case WifiPhy::IDLE:

    std::cout << "idle    ";

    break;

  }

  std::cout << " start="<<start<<" duration="<<duration<<std::endl;

}

static void

SetPosition (Ptr<Node> node, Vector position)

{

  Ptr<MobilityModel> mobility = node->GetObject<MobilityModel> ();

  mobility->SetPosition (position);

}

static Vector

GetPosition (Ptr<Node> node)

{

  Ptr<MobilityModel> mobility = node->GetObject<MobilityModel> ();

  return mobility->GetPosition ();

}

static void 

AdvancePosition (Ptr<Node> node) 

{

  Vector pos = GetPosition (node);

  pos.x += 5.0;

  if (pos.x >= 210.0) 

    {

      return;

    }

  SetPosition (node, pos);

  //std::cout << "x="<<pos.x << std::endl;

  Simulator::Schedule (Seconds (1.0), &AdvancePosition, node);

}

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

{

  CommandLine cmd;

   cmd.Parse (argc, argv);

  Packet::EnablePrinting ();

  // enable rts cts all the time.

  Config::SetDefault ("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue ("0"));

  // disable fragmentation

  Config::SetDefault ("ns3::WifiRemoteStationManager::FragmentationThreshold", StringValue ("2200"));

  WifiHelper wifi = WifiHelper::Default ();

  MobilityHelper mobility;

  NodeContainer stas;

  NodeContainer ap;

  NetDeviceContainer staDevs;

  PacketSocketHelper packetSocket;

  stas.Create (2);

  ap.Create (1);

  // give packet socket powers to nodes.

  packetSocket.Install (stas);

  packetSocket.Install (ap);

  NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default ();

  YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();

  YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();

  wifiPhy.SetChannel (wifiChannel.Create ());

  Ssid ssid = Ssid ("wifi-default");

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

  // setup stas.

  wifiMac.SetType ("ns3::NqstaWifiMac", 

               "Ssid", SsidValue (ssid),

               "ActiveProbing", BooleanValue (false));

  staDevs = wifi.Install (wifiPhy, wifiMac, stas);

  // setup ap.

  wifiMac.SetType ("ns3::NqapWifiMac", "Ssid", SsidValue (ssid),

               "BeaconGeneration", BooleanValue (true),

               "BeaconInterval", TimeValue (Seconds (2.5)));

  wifi.Install (wifiPhy, wifiMac, ap);

  // mobility.

  mobility.Install (stas);

  mobility.Install (ap);

  Simulator::Schedule (Seconds (1.0), &AdvancePosition, ap.Get (0));

  PacketSocketAddress socket;

  socket.SetSingleDevice(staDevs.Get (0)->GetIfIndex ());

  socket.SetPhysicalAddress (staDevs.Get (1)->GetAddress ());

  socket.SetProtocol (1);

  OnOffHelper onoff ("ns3::PacketSocketFactory", Address (socket));

  onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (42)));

  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));

  ApplicationContainer apps = onoff.Install (stas.Get (0));

  apps.Start (Seconds (0.5));

  apps.Stop (Seconds (43.0));

  Simulator::Stop (Seconds (44.0));

  Config::Connect ("/NodeList/*/DeviceList/*/Mac/MacTx", MakeCallback (&DevTxTrace));

  Config::Connect ("/NodeList/*/DeviceList/*/Mac/MacRx", MakeCallback (&DevRxTrace));

  Config::Connect ("/NodeList/*/DeviceList/*/Phy/State/RxOk", MakeCallback (&PhyRxOkTrace));

  Config::Connect ("/NodeList/*/DeviceList/*/Phy/State/RxError", MakeCallback (&PhyRxErrorTrace));

  Config::Connect ("/NodeList/*/DeviceList/*/Phy/State/Tx", MakeCallback (&PhyTxTrace));

  Config::Connect ("/NodeList/*/DeviceList/*/Phy/State/State", MakeCallback (&PhyStateTrace));

  AthstatsHelper athstats;

  athstats.EnableAthstats("athstats-sta", stas);

  athstats.EnableAthstats("athstats-ap", ap);

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}