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

/*

 * Copyright (c) 2009 University of Washington

 *

 * 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

 *

 */

//

// This program configures a grid (default 5x5) of nodes on an 

// 802.11b physical layer, with

// 802.11b NICs in adhoc mode, and by default, sends one packet of 1000 

// (application) bytes to node 1.

//

// The default layout is like this, on a 2-D grid.

//

// n20  n21  n22  n23  n24

// n15  n16  n17  n18  n19

// n10  n11  n12  n13  n14

// n5   n6   n7   n8   n9

// n0   n1   n2   n3   n4

//

// the layout is affected by the parameters given to GridPositionAllocator;

// by default, GridWidth is 5 and numNodes is 25..

//

// There are a number of command-line options available to control

// the default behavior.  The list of available command-line options

// can be listed with the following command:

// ./waf --run "wifi-simple-adhoc-grid --help"

//

// Note that all ns-3 attributes (not just the ones exposed in the below

// script) can be changed at command line; see the ns-3 documentation.

//

// For instance, for this configuration, the physical layer will

// stop successfully receiving packets when distance increases beyond

// the default of 500m.

// To see this effect, try running:

//

// ./waf --run "wifi-simple-adhoc --distance=500"

// ./waf --run "wifi-simple-adhoc --distance=1000"

// ./waf --run "wifi-simple-adhoc --distance=1500"

// 

// The source node and sink node can be changed like this:

// 

// ./waf --run "wifi-simple-adhoc --sourceNode=20 --sinkNode=10"

//

// This script can also be helpful to put the Wifi layer into verbose

// logging mode; this command will turn on all wifi logging:

// 

// ./waf --run "wifi-simple-adhoc-grid --verbose=1"

//

// By default, trace file writing is off-- to enable it, try:

// ./waf --run "wifi-simple-adhoc-grid --tracing=1"

//

// When you are done tracing, you will notice many pcap trace files 

// in your directory.  If you have tcpdump installed, you can try this:

//

// tcpdump -r wifi-simple-adhoc-grid-0-0.pcap -nn -tt

//

#include "ns3/core-module.h"

#include "ns3/network-module.h"

#include "ns3/mobility-module.h"

#include "ns3/config-store-module.h"

#include "ns3/wifi-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 <iostream>

#include <fstream>

#include <vector>

#include <string>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("WifiSimpleAdhocGrid");

void ReceivePacket (Ptr<Socket> socket)

{

  while (socket->Recv ())

    {

      NS_LOG_UNCOND ("Received one packet!");

    }

}

static void GenerateTraffic (Ptr<Socket> socket, uint32_t pktSize, 

                             uint32_t pktCount, Time pktInterval )

{

  if (pktCount > 0)

    {

      socket->Send (Create<Packet> (pktSize));

      Simulator::Schedule (pktInterval, &GenerateTraffic, 

                           socket, pktSize,pktCount-1, pktInterval);

    }

  else

    {

      socket->Close ();

    }

}

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

{

  std::string phyMode ("DsssRate1Mbps");

  double distance = 500;  // m

  uint32_t packetSize = 1000; // bytes

  uint32_t numPackets = 1;

  uint32_t numNodes = 25;  // by default, 5x5

  uint32_t sinkNode = 0;

  uint32_t sourceNode = 24;

  double interval = 1.0; // seconds

  bool verbose = false;

  bool tracing = false;

  CommandLine cmd;

  cmd.AddValue ("phyMode", "Wifi Phy mode", phyMode);

  cmd.AddValue ("distance", "distance (m)", distance);

  cmd.AddValue ("packetSize", "size of application packet sent", packetSize);

  cmd.AddValue ("numPackets", "number of packets generated", numPackets);

  cmd.AddValue ("interval", "interval (seconds) between packets", interval);

  cmd.AddValue ("verbose", "turn on all WifiNetDevice log components", verbose);

  cmd.AddValue ("tracing", "turn on ascii and pcap tracing", tracing);

  cmd.AddValue ("numNodes", "number of nodes", numNodes);

  cmd.AddValue ("sinkNode", "Receiver node number", sinkNode);

  cmd.AddValue ("sourceNode", "Sender node number", sourceNode);

  cmd.Parse (argc, argv);

  // Convert to time object

  Time interPacketInterval = Seconds (interval);

  // disable fragmentation for frames below 2200 bytes

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

  // turn off RTS/CTS for frames below 2200 bytes

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

  // Fix non-unicast data rate to be the same as that of unicast

  Config::SetDefault ("ns3::WifiRemoteStationManager::NonUnicastMode", 

                      StringValue (phyMode));

  NodeContainer c;

  c.Create (numNodes);

  // The below set of helpers will help us to put together the wifi NICs we want

  WifiHelper wifi;

  if (verbose)

    {

      wifi.EnableLogComponents ();  // Turn on all Wifi logging

    }

  YansWifiPhyHelper wifiPhy =  YansWifiPhyHelper::Default ();

  // set it to zero; otherwise, gain will be added

  wifiPhy.Set ("RxGain", DoubleValue (-10) ); 

  // ns-3 supports RadioTap and Prism tracing extensions for 802.11b

  wifiPhy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO); 

  YansWifiChannelHelper wifiChannel;

  wifiChannel.SetPropagationDelay ("ns3::ConstantSpeedPropagationDelayModel");

  wifiChannel.AddPropagationLoss ("ns3::FriisPropagationLossModel");

  wifiPhy.SetChannel (wifiChannel.Create ());

  // Add a non-QoS upper mac, and disable rate control

  NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default ();

  wifi.SetStandard (WIFI_PHY_STANDARD_80211b);

  wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",

                                "DataMode",StringValue (phyMode),

                                "ControlMode",StringValue (phyMode));

  // Set it to adhoc mode

  wifiMac.SetType ("ns3::AdhocWifiMac");

  NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, c);

  MobilityHelper mobility;

  mobility.SetPositionAllocator ("ns3::GridPositionAllocator",

                                 "MinX", DoubleValue (0.0),

                                 "MinY", DoubleValue (0.0),

                                 "DeltaX", DoubleValue (distance),

                                 "DeltaY", DoubleValue (distance),

                                 "GridWidth", UintegerValue (5),

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

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

  mobility.Install (c);

  // Enable OLSR

  OlsrHelper olsr;

  Ipv4StaticRoutingHelper staticRouting;

  Ipv4ListRoutingHelper list;

  list.Add (staticRouting, 0);

  list.Add (olsr, 10);

  InternetStackHelper internet;

  internet.SetRoutingHelper (list); // has effect on the next Install ()

  internet.Install (c);

  Ipv4AddressHelper ipv4;

  NS_LOG_INFO ("Assign IP Addresses.");

  ipv4.SetBase ("10.1.1.0", "255.255.255.0");

  Ipv4InterfaceContainer i = ipv4.Assign (devices);

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

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

  InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 80);

  recvSink->Bind (local);

  recvSink->SetRecvCallback (MakeCallback (&ReceivePacket));

  Ptr<Socket> source = Socket::CreateSocket (c.Get (sourceNode), tid);

  InetSocketAddress remote = InetSocketAddress (i.GetAddress (sinkNode, 0), 80);

  source->Connect (remote);

  if (tracing == true)

    {

      AsciiTraceHelper ascii;

      wifiPhy.EnableAsciiAll (ascii.CreateFileStream ("wifi-simple-adhoc-grid.tr"));

      wifiPhy.EnablePcap ("wifi-simple-adhoc-grid", devices);

      // Trace routing tables

      Ptr<OutputStreamWrapper> routingStream = Create<OutputStreamWrapper> ("wifi-simple-adhoc-grid.routes", std::ios::out);

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

      Ptr<OutputStreamWrapper> neighborStream = Create<OutputStreamWrapper> ("wifi-simple-adhoc-grid.neighbors", std::ios::out);

      olsr.PrintNeighborCacheAllEvery (Seconds (2), neighborStream);

      // To do-- enable an IP-level trace that shows forwarding events only

    }

  // Give OLSR time to converge-- 30 seconds perhaps

  Simulator::Schedule (Seconds (30.0), &GenerateTraffic, 

                       source, packetSize, numPackets, interPacketInterval);

  // Output what we are doing

  NS_LOG_UNCOND ("Testing from node " << sourceNode << " to " << sinkNode << " with grid distance " << distance);

  Simulator::Stop (Seconds (33.0));

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}