/* -*-  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/wifi-net-device.h"

#include "ns3/wifi-channel.h"

#include "ns3/wifi-phy.h"

#include "ns3/simulator.h"

#include "ns3/callback.h"

#include "ns3/ptr.h"

#include "ns3/node.h"

#include "ns3/internet-node.h"

#include "ns3/onoff-application.h"

#include "ns3/static-mobility-model.h"

#include "ns3/ipv4.h"

#include "ns3/random-variable.h"

#include "ns3/inet-socket-address.h"

#include "ns3/global-route-manager.h"

#include "ns3/packet.h"

#include "ns3/node-list.h"

#include <iostream>

using namespace ns3;

static void

WifiNetDeviceTrace (const TraceContext &context, Packet p, Mac48Address address)

{

  std::cout << context << " ad=" << address << " p: " << p << std::endl;

}

static void

WifiPhyStateTrace (const TraceContext &context, Time start, Time duration, enum WifiPhy::State state)

{

  std::cout << context << " 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 Ptr<Node>

CreateApNode (Ptr<WifiChannel> channel,

              Position position, 

              const char *ipAddress,

              Ssid ssid)

{

  Ptr<Node> node = Create<InternetNode> ();  

  Ptr<NqapWifiNetDevice> device = Create<NqapWifiNetDevice> (node);

  device->SetSsid (ssid);

  device->ConnectTo (channel);

  Ptr<MobilityModel> mobility = Create<StaticMobilityModel> ();

  mobility->Set (position);

  node->AddInterface (mobility);

  Ptr<Ipv4> ipv4 = node->QueryInterface<Ipv4> (Ipv4::iid);

  uint32_t index = ipv4->AddInterface (device);

  ipv4->SetAddress (index, Ipv4Address (ipAddress));

  ipv4->SetNetworkMask (index, Ipv4Mask ("255.255.0.0"));

  ipv4->SetUp (index);

  return node;

}

static Ptr<Node>

CreateStaNode (Ptr<WifiChannel> channel,

               Position position, 

               const char *ipAddress,

               Ssid ssid)

{

  Ptr<Node> node = Create<InternetNode> ();  

  Ptr<NqstaWifiNetDevice> device = Create<NqstaWifiNetDevice> (node);

  Simulator::ScheduleNow (&NqstaWifiNetDevice::StartActiveAssociation, device, 

                          ssid);

  device->ConnectTo (channel);

  Ptr<MobilityModel> mobility = Create<StaticMobilityModel> ();

  mobility->Set (position);

  node->AddInterface (mobility);

  Ptr<Ipv4> ipv4 = node->QueryInterface<Ipv4> (Ipv4::iid);

  uint32_t index = ipv4->AddInterface (device);

  ipv4->SetAddress (index, Ipv4Address (ipAddress));

  ipv4->SetNetworkMask (index, Ipv4Mask ("255.255.0.0"));

  ipv4->SetUp (index);

  return node;

}

static void

SetPosition (Ptr<Node> node, Position position)

{

  Ptr<MobilityModel> mobility = node->QueryInterface<MobilityModel> (MobilityModel::iid);

  mobility->Set (position);

}

static Position

GetPosition (Ptr<Node> node)

{

  Ptr<MobilityModel> mobility = node->QueryInterface<MobilityModel> (MobilityModel::iid);

  return mobility->Get ();

}

static void 

AdvancePosition (Ptr<Node> node) 

{

  Position 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[])

{

  Simulator::SetLinkedList ();

  Packet::EnableMetadata ();

  //Simulator::EnableLogTo ("80211.log");

  // enable rts cts all the time.

  DefaultValue::Bind ("WifiRtsCtsThreshold", "0");

  // disable fragmentation

  DefaultValue::Bind ("WifiFragmentationThreshold", "2200");

  DefaultValue::Bind ("WifiRateControlAlgorithm", "Aarf");

  //DefaultValue::Bind ("WifiRateControlAlgorithm", "Arf");

  Ptr<WifiChannel> channel = Create<WifiChannel> ();

  Ssid ssid = Ssid ("mathieu");

  Ptr<Node> a = CreateApNode (channel, 

                              Position (5.0,0.0,0.0),

                              "192.168.0.1",

                              ssid);

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

  Ptr<Node> b = CreateStaNode (channel,

                               Position (0.0, 0.0, 0.0),

                               "192.168.0.2",

                               ssid);

  Ptr<Node> c = CreateStaNode (channel,

                               Position (0.0, 0.0, 0.0),

                               "192.168.0.3",

                               ssid);

  Ptr<Application> app = Create<OnOffApplication> (b, InetSocketAddress ("192.168.0.3", 10), 

                                                   "Udp", 

                                                   ConstantVariable (42),

                                                   ConstantVariable (0));

  app->Start (Seconds (0.5));

  app->Stop (Seconds (43.0));

  GlobalRouteManager::PopulateRoutingTables ();

  NodeList::Connect ("/nodes/*/devices/*/*", MakeCallback (&WifiNetDeviceTrace));

  NodeList::Connect ("/nodes/*/devices/*/phy/state", MakeCallback (&WifiPhyStateTrace));

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}