/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2008,2009 IITP RAS
 *
 * 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: Kirill Andreev <andreev@iitp.ru>
 *
 *
 * By default this script creates m_xSize * m_ySize square grid topology with
 * IEEE802.11s stack installed at each node with peering management
 * and HWMP protocol.
 * The side of the square cell is defined by m_step parameter.
 * When topology is created, UDP ping is installed to opposite corners
 * by diagonals. packet size of the UDP ping and interval between two
 * successive packets is configurable.
 * 
 *  m_xSize * step
 *  |<--------->|
 *   step
 *  |<--->|
 *  * --- * --- * <---Ping sink  _
 *  | \   |   / |                ^
 *  |   \ | /   |                |
 *  * --- * --- * m_ySize * step |
 *  |   / | \   |                |
 *  | /   |   \ |                |
 *  * --- * --- *                _
 *  ^ Ping source
 *
 *  See also MeshTest::Configure to read more about configurable
 *  parameters.
 */


#include "ns3/core-module.h"
#include "ns3/simulator-module.h"
#include "ns3/node-module.h"
#include "ns3/helper-module.h"
#include "ns3/global-routing-module.h"
#include "ns3/wifi-module.h"
#include "ns3/mesh-module.h"
#include "ns3/mobility-module.h"
#include "ns3/mesh-helper.h"

#include <iostream>
#include <sstream>
#include <fstream>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("TestMeshScript");
class MeshTest
{
  public:
    /// Init test
    MeshTest ();
    /// Configure test from command line arguments
    void Configure (int argc, char ** argv);
    /// Run test
    int Run ();
  private:
    int       m_xSize;
    int       m_ySize;
    double    m_step;
    double    m_randomStart;
    double    m_totalTime;
    double    m_packetInterval;
    uint16_t  m_packetSize;
    uint32_t  m_nIfaces;
    bool      m_chan;
    bool      m_pcap;
    std::string m_stack;
    std::string m_root;
    /// List of network nodes
    NodeContainer nodes;
    /// List of all mesh point devices
    NetDeviceContainer meshDevices;
    //Addresses of interfaces:
    Ipv4InterfaceContainer interfaces;
    // MeshHelper. Report is not static methods
    MeshHelper mesh;
  private:
    /// Create nodes and setup their mobility
    void CreateNodes ();
    /// Install internet m_stack on nodes
    void InstallInternetStack ();
    /// Install applications
    void InstallApplication ();
    /// Print mesh devices diagnostics
    void Report ();  
};
MeshTest::MeshTest () :
  m_xSize (3),
  m_ySize (3),
  m_step (100.0),
  m_randomStart (0.1),
  m_totalTime (100.0),
  m_packetInterval (0.1),
  m_packetSize (1024),
  m_nIfaces (1),
  m_chan (true),
  m_pcap (false),
  m_stack ("ns3::Dot11sStack"),
  m_root ("ff:ff:ff:ff:ff:ff")
{
}
void
MeshTest::Configure (int argc, char *argv[])
{
  CommandLine cmd;
  cmd.AddValue ("x-size", "Number of nodes in a row grid. [6]", m_xSize);
  cmd.AddValue ("y-size", "Number of rows in a grid. [6]", m_ySize);
  cmd.AddValue ("step",   "Size of edge in our grid, meters. [100 m]", m_step);
  /*
   * As soon as starting node means that it sends a beacon,
   * simultaneous start is not good.
   */
  cmd.AddValue ("start",  "Maximum random start delay, seconds. [0.1 s]", m_randomStart);
  cmd.AddValue ("time",  "Simulation time, seconds [100 s]", m_totalTime);
  cmd.AddValue ("packet-interval",  "Interval between packets in UDP ping, seconds [0.001 s]", m_packetInterval);
  cmd.AddValue ("packet-size",  "Size of packets in UDP ping", m_packetSize);
  cmd.AddValue ("interfaces", "Number of radio interfaces used by each mesh point. [1]", m_nIfaces);
  cmd.AddValue ("channels",   "Use different frequency channels for different interfaces. [0]", m_chan);
  cmd.AddValue ("pcap",   "Enable PCAP traces on interfaces. [0]", m_pcap);
  cmd.AddValue ("stack",  "Type of protocol stack. ns3::Dot11sStack by default", m_stack);
  cmd.AddValue ("root", "Mac address of root mesh point in HWMP", m_root);
  
  cmd.Parse (argc, argv);
  NS_LOG_DEBUG ("Grid:" << m_xSize << "*" << m_ySize);
  NS_LOG_DEBUG ("Simulation time: " << m_totalTime << " s");
}
void
MeshTest::CreateNodes ()
{ 
  /*
   * Create m_ySize*m_xSize stations to form a grid topology
   */
  nodes.Create (m_ySize*m_xSize);
  // Configure YansWifiChannel
  YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
  YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();
  wifiPhy.SetChannel (wifiChannel.Create ());
  /*
   * Create mesh helper and set stack installer to it
   * Stack installer creates all needed protocols and install them to
   * mesh point device
   */
  mesh = MeshHelper::Default ();
  mesh.SetStackInstaller (m_stack, "Root", Mac48AddressValue (Mac48Address (m_root.c_str ())));
  if (m_chan)
    {
      mesh.SetSpreadInterfaceChannels (MeshHelper::SPREAD_CHANNELS);
    }
  else
    {
      mesh.SetSpreadInterfaceChannels (MeshHelper::ZERO_CHANNEL);
    }
  mesh.SetMacType ("RandomStart", TimeValue (Seconds(m_randomStart)));
  // Set number of interfaces - default is single-interface mesh point
  mesh.SetNumberOfInterfaces (m_nIfaces);
  // Install protocols and return container if MeshPointDevices
  meshDevices = mesh.Install (wifiPhy, nodes);
  // Setup mobility - static grid topology
  MobilityHelper mobility;
  mobility.SetPositionAllocator ("ns3::GridPositionAllocator",
                                 "MinX", DoubleValue (0.0),
                                 "MinY", DoubleValue (0.0),
                                 "DeltaX", DoubleValue (m_step),
                                 "DeltaY", DoubleValue (m_step),
                                 "GridWidth", UintegerValue (m_xSize),
                                 "LayoutType", StringValue ("RowFirst"));
  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  mobility.Install (nodes);
  if (m_pcap)
    wifiPhy.EnablePcapAll (std::string ("mp-"));
}
void
MeshTest::InstallInternetStack ()
{
  InternetStackHelper internetStack;
  internetStack.Install (nodes);
  Ipv4AddressHelper address;
  address.SetBase ("10.1.1.0", "255.255.255.0");
  interfaces = address.Assign (meshDevices);
}
void
MeshTest::InstallApplication ()
{
  UdpEchoServerHelper echoServer (9);
  ApplicationContainer serverApps = echoServer.Install (nodes.Get (0));
  serverApps.Start (Seconds (0.0));
  serverApps.Stop (Seconds (m_totalTime));
  UdpEchoClientHelper echoClient (interfaces.GetAddress (0), 9);
  echoClient.SetAttribute ("MaxPackets", UintegerValue ((uint32_t)(m_totalTime*(1/m_packetInterval))));
  echoClient.SetAttribute ("Interval", TimeValue (Seconds (m_packetInterval)));
  echoClient.SetAttribute ("PacketSize", UintegerValue (m_packetSize));
  ApplicationContainer clientApps = echoClient.Install (nodes.Get (m_xSize*m_ySize-1));
  clientApps.Start (Seconds (0.0));
  clientApps.Stop (Seconds (m_totalTime));
}
int
MeshTest::Run ()
{
  CreateNodes ();
  InstallInternetStack ();
  InstallApplication ();
  Simulator::Schedule (Seconds(m_totalTime), & MeshTest::Report, this);
  Simulator::Stop (Seconds (m_totalTime));
  Simulator::Run ();
  Simulator::Destroy ();
  return 0;
}
void
MeshTest::Report ()
{
  unsigned n (0);
  for (NetDeviceContainer::Iterator i = meshDevices.Begin (); i != meshDevices.End (); ++i, ++n)
  {
    std::ostringstream os;
    os << "mp-report-" << n << ".xml";
    std::cerr << "Printing mesh point device #" << n << " diagnostics to " << os.str () << "\n";
    std::ofstream of;
    of.open (os.str().c_str());
    if (! of.is_open ())
    {
      std::cerr << "Error: Can't open file " << os.str() << "\n";
      return;
    }
    mesh.Report (*i, of);
    of.close ();
  }
}
int
main (int argc, char *argv[])
{
  MeshTest t; 
  t.Configure (argc, argv);
  return t.Run();
}