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

/*

 * Copyright (c) 2006 INRIA

 * All rights reserved.

 *

 * 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/simulator.h"

#include "ns3/scheduler-list.h"

#include "ns3/scheduler-map.h"

#include "ns3/scheduler-heap.h"

#include "ns3/system-wall-clock-ms.h"

#include <iostream>

#include <fstream>

#include <vector>

using namespace ns3;

bool g_debug = false;

class Bench 

{

public:

  void ReadDistribution (std::istream &istream);

  void SetTotal (uint32_t total);

  void RunBench (void);

private:

  void Cb (void);

  std::vector<uint64_t> m_distribution;

  std::vector<uint64_t>::const_iterator m_current;

  uint32_t m_n;

  uint32_t m_total;

};

void 

Bench::SetTotal (uint32_t total)

{

  m_total = total;

}

void

Bench::ReadDistribution (std::istream &input)

{

  double data;

  while (!input.eof ()) 

    {

      if (input >> data) 

        {

          uint64_t ns = (uint64_t) (data * 1000000000);

          m_distribution.push_back (ns);

        } 

      else 

        {

          input.clear ();

          std::string line;

          input >> line;

        }

    }

}

void

Bench::RunBench (void) 

{

  SystemWallClockMs time;

  double init, simu;

  time.Start ();

  for (std::vector<uint64_t>::const_iterator i = m_distribution.begin ();

       i != m_distribution.end (); i++) 

    {

      Simulator::Schedule (NanoSeconds (*i), &Bench::Cb, this);

    }

  init = time.End ();

  init /= 1000;

  m_current = m_distribution.begin ();

  time.Start ();

  Simulator::Run ();

  simu = time.End ();

  simu /= 1000;

  std::cout <<

      "init n=" << m_distribution.size () << ", time=" << init << "s" << std::endl <<

      "simu n=" << m_n << ", time=" <<simu << "s" << std::endl <<

      "init " << ((double)m_distribution.size ()) / init << " insert/s, avg insert=" <<

      init / ((double)m_distribution.size ())<< "s" << std::endl <<

      "simu " << ((double)m_n) / simu<< " hold/s, avg hold=" << 

      simu / ((double)m_n) << "s" << std::endl

      ;

}

void

Bench::Cb (void)

{

  if (m_n > m_total) 

    {

      return;

    }

  if (m_current == m_distribution.end ()) 

    {

      m_current = m_distribution.begin ();

    }

  if (g_debug) 

    {

      std::cerr << "event at " << Simulator::Now ().GetSeconds () << "s" << std::endl;

    }

  Simulator::Schedule (NanoSeconds (*m_current), &Bench::Cb, this);

  m_current++;

  m_n++;

}

void

PrintHelp (void)

{

  std::cout << "bench-simulator filename [options]"<<std::endl;

  std::cout << "  filename: a string which identifies the input distribution. \"-\" represents stdin." << std::endl;

  std::cout << "  Options:"<<std::endl;

  std::cout << "      --list: use std::list scheduler"<<std::endl;

  std::cout << "      --map: use std::map cheduler"<<std::endl;

  std::cout << "      --heap: use Binary Heap scheduler"<<std::endl;

  std::cout << "      --log=filename: log scheduler events for the event replay utility."<<std::endl;

  std::cout << "      --debug: enable some debugging"<<std::endl;

}

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

{

  char const *filename = argv[1];

  std::istream *input;

  uint32_t n = 1;

  uint32_t total = 20000;

  if (argc == 1)

    {

      PrintHelp ();

      return 0;

    }

  argc-=2;

  argv+= 2;

  if (strcmp (filename, "-") == 0) 

    {

      input = &std::cin;

    } 

  else 

    {

      input = new std::ifstream (filename);

    }

  while (argc > 0) 

    {

      if (strcmp ("--list", argv[0]) == 0) 

        {

          Simulator::SetScheduler (CreateObject<SchedulerList> ());

        } 

      else if (strcmp ("--heap", argv[0]) == 0) 

        {

          Simulator::SetScheduler (CreateObject<SchedulerHeap> ());

        } 

      else if (strcmp ("--map", argv[0]) == 0) 

        {

          Simulator::SetScheduler (CreateObject<SchedulerMap> ());

        } 

      else if (strcmp ("--debug", argv[0]) == 0) 

        {

          g_debug = true;

        } 

      else if (strncmp ("--log=", argv[0],strlen ("--log=")) == 0) 

        {

          char const *filename = argv[0] + strlen ("--log=");

          Simulator::EnableLogTo (filename);

        }

      else if (strncmp ("--total=", argv[0], strlen("--total=")) == 0) 

        {

          total = atoi (argv[0]+strlen ("--total="));

        } 

      else if (strncmp ("--n=", argv[0], strlen("--n=")) == 0) 

        {

          n = atoi (argv[0]+strlen ("--n="));

        } 

      argc--;

      argv++;

  }

  Bench *bench = new Bench ();

  bench->ReadDistribution (*input);

  bench->SetTotal (total);

  for (uint32_t i = 0; i < n; i++)

    {

      bench->RunBench ();

    }

  return 0;

}