/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2019 Ritsumeikan University, Shiga, Japan
 *
 * 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: Alberto Gallegos Ramonet <ramonet@fc.ritsumei.ac.jp>
 *
 *
 * TraceRoute application example using AODV routing protocol.
 *
 *
 */

#include "ns3/aodv-module.h"
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/internet-module.h"
#include "ns3/mobility-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/wifi-module.h"
#include "ns3/v4traceroute-helper.h"
#include <iostream>
#include <cmath>

using namespace ns3;

/**
 * \ingroup aodv-examples
 * \ingroup examples
 * \brief Test script.
 *
 * This script creates 1-dimensional grid topology and Traceroute the last node from the first one:
 *
 * [10.0.0.1] <-- step --> [10.0.0.2] <-- step --> [10.0.0.3] <-- step --> [10.0.0.4]
 *
 * The results should be all the intermediate hops all the way to 10.0.0.10
 *
 * Usage:
 *
 * traceroute 10.0.0.10
 */
class TracerouteExample
{
public:
  TracerouteExample ();
  /**
   * \brief Configure script parameters
   * \param argc is the command line argument count
   * \param argv is the command line arguments
   * \return true on successful configuration
  */
  bool Configure (int argc, char **argv);
  /// Run simulation
  void Run ();
  /**
   * Report results
   * \param os the output stream
   */
  void Report (std::ostream & os);

private:
  // parameters
  /// Number of nodes
  uint32_t size;
  /// Distance between nodes, meters
  double step;
  /// Simulation time, seconds
  double totalTime;
  /// Write per-device PCAP traces if true
  bool pcap;
  /// Print aodv routes if true
  bool printRoutes;
  /// nodes used in the example
  NodeContainer nodes;
  /// devices used in the example
  NetDeviceContainer devices;
  /// interfaces used in the example
  Ipv4InterfaceContainer interfaces;

private:
  /// Create the nodes
  void CreateNodes ();
  /// Create the devices
  void CreateDevices ();
  /// Create the network
  void InstallInternetStack ();
  /// Create the simulation applications

  void InstallApplications ();
};

int main (int argc, char **argv)
{
  TracerouteExample test;
  if (!test.Configure (argc, argv))
    {
      NS_FATAL_ERROR ("Configuration failed. Aborted.");
    }

  test.Run ();
  test.Report (std::cout);
  return 0;
}

//-----------------------------------------------------------------------------
TracerouteExample::TracerouteExample ()
  : size (10),
    step (50),
    totalTime (100),
    pcap (false),
    printRoutes (false)
{
}

bool
TracerouteExample::Configure (int argc, char **argv)
{
  // Enable AODV logs by default. Comment this if too noisy
  // LogComponentEnable("AodvRoutingProtocol", LOG_LEVEL_ALL);

  SeedManager::SetSeed (12345);
  CommandLine cmd (__FILE__);

  cmd.AddValue ("pcap", "Write PCAP traces.", pcap);
  cmd.AddValue ("printRoutes", "Print routing table dumps.", printRoutes);
  cmd.AddValue ("size", "Number of nodes.", size);
  cmd.AddValue ("time", "Simulation time, s.", totalTime);
  cmd.AddValue ("step", "Grid step, m", step);

  cmd.Parse (argc, argv);
  return true;
}

void
TracerouteExample::Run ()
{
  CreateNodes ();

  CreateDevices ();

  InstallInternetStack ();

  InstallApplications ();

  std::cout << "Starting simulation for " << totalTime << " s ...\n";

  Simulator::Stop (Seconds (totalTime));
  Simulator::Run ();
  Simulator::Destroy ();
}

void
TracerouteExample::Report (std::ostream &)
{
}

void
TracerouteExample::CreateNodes ()
{
  std::cout << "Creating " << (unsigned)size << " nodes " << step << " m apart.\n";
  nodes.Create (size);
  // Name nodes
  for (uint32_t i = 0; i < size; ++i)
    {
      std::ostringstream os;
      os << "node-" << i;
      Names::Add (os.str (), nodes.Get (i));
    }
  // Create static grid
  MobilityHelper mobility;
  mobility.SetPositionAllocator ("ns3::GridPositionAllocator",
                                 "MinX", DoubleValue (0.0),
                                 "MinY", DoubleValue (0.0),
                                 "DeltaX", DoubleValue (step),
                                 "DeltaY", DoubleValue (0),
                                 "GridWidth", UintegerValue (size),
                                 "LayoutType", StringValue ("RowFirst"));
  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  mobility.Install (nodes);
}

void
TracerouteExample::CreateDevices ()
{
  WifiMacHelper wifiMac;
  wifiMac.SetType ("ns3::AdhocWifiMac");
  YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
  YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();
  wifiPhy.SetChannel (wifiChannel.Create ());
  WifiHelper wifi;
  wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager", "DataMode", StringValue ("OfdmRate6Mbps"), "RtsCtsThreshold", UintegerValue (0));
  devices = wifi.Install (wifiPhy, wifiMac, nodes);

  if (pcap)
    {
      wifiPhy.EnablePcapAll (std::string ("aodv"));
    }
}

void
TracerouteExample::InstallInternetStack ()
{
  AodvHelper aodv;
  // you can configure AODV attributes here using aodv.Set(name, value)
  InternetStackHelper stack;
  stack.SetRoutingHelper (aodv); // has effect on the next Install ()
  stack.Install (nodes);
  Ipv4AddressHelper address;
  address.SetBase ("10.0.0.0", "255.0.0.0");
  interfaces = address.Assign (devices);

  if (printRoutes)
    {
      Ptr<OutputStreamWrapper> routingStream = Create<OutputStreamWrapper> ("aodv.routes", std::ios::out);
      aodv.PrintRoutingTableAllAt (Seconds (8), routingStream);

    }
}

void
TracerouteExample::InstallApplications ()
{
  V4TraceRouteHelper traceroute (Ipv4Address ("10.0.0.10")); //size - 1
  traceroute.SetAttribute ("Verbose", BooleanValue (true));
  ApplicationContainer p = traceroute.Install (nodes.Get (0));

  // Used when we wish to dump the traceroute results into a file

  //Ptr<OutputStreamWrapper> printstrm = Create<OutputStreamWrapper> ("mytrace", std::ios::out);
  //traceroute.PrintTraceRouteAt(nodes.Get(0),printstrm);

  p.Start (Seconds (0));
  p.Stop (Seconds (totalTime) - Seconds (0.001));

}

