/* -*-  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/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 <iostream>
#include <fstream>
#include <vector>
#include <string>

NS_LOG_COMPONENT_DEFINE ("WifiSimpleAdhocGrid");

using namespace ns3;

void ReceivePacket (Ptr<Socket> socket)
{
  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 ("wifib-1mbs");
  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 ();
  // This is one parameter that matters when using FixedRssLossModel
  // set it to zero; otherwise, gain will be added
  wifiPhy.Set ("RxGain", DoubleValue (-10) ); 
  // ns-3 support RadioTap and Prism tracing extensions for 802.11b
  wifiPhy.SetPcapFormat (YansWifiPhyHelper::PCAP_FORMAT_80211_RADIOTAP); 

  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.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);
  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)
    {
      wifiPhy.EnablePcap ("wifi-simple-adhoc-grid", devices);
      std::ofstream ascii;
      ascii.open ("wifi-simple-adhoc-grid.tr");
      YansWifiPhyHelper::EnableAsciiAll (ascii);
      // 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 (32.0));
  Simulator::Run ();
  Simulator::Destroy ();

  return 0;
}