/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2013 University of California, Los Angeles
 *
 * 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 */

#include "ndn-app-delay-tracer.hpp"
#include "ns3/node.h"
#include "ns3/packet.h"
#include "ns3/config.h"
#include "ns3/names.h"
#include "ns3/callback.h"

#include "ns3/ndn-app.hpp"
#include "ns3/ndn-interest.hpp"
#include "ns3/ndn-data.hpp"
#include "ns3/simulator.h"
#include "ns3/node-list.h"
#include "ns3/log.h"

#include <boost/lexical_cast.hpp>
#include <boost/make_shared.hpp>

#include <fstream>

NS_LOG_COMPONENT_DEFINE("ndn.AppDelayTracer");

using namespace std;

namespace ns3 {
namespace ndn {

static std::list<boost::tuple<boost::shared_ptr<std::ostream>, std::list<Ptr<AppDelayTracer>>>>
  g_tracers;

template<class T>
static inline void
NullDeleter(T* ptr)
{
}

void
AppDelayTracer::Destroy()
{
  g_tracers.clear();
}

void
AppDelayTracer::InstallAll(const std::string& file)
{
  using namespace boost;
  using namespace std;

  std::list<Ptr<AppDelayTracer>> tracers;
  boost::shared_ptr<std::ostream> outputStream;
  if (file != "-") {
    boost::shared_ptr<std::ofstream> os(new std::ofstream());
    os->open(file.c_str(), std::ios_base::out | std::ios_base::trunc);

    if (!os->is_open()) {
      NS_LOG_ERROR("File " << file << " cannot be opened for writing. Tracing disabled");
      return;
    }

    outputStream = os;
  }
  else {
    outputStream = boost::shared_ptr<std::ostream>(&std::cout, NullDeleter<std::ostream>);
  }

  for (NodeList::Iterator node = NodeList::Begin(); node != NodeList::End(); node++) {
    Ptr<AppDelayTracer> trace = Install(*node, outputStream);
    tracers.push_back(trace);
  }

  if (tracers.size() > 0) {
    // *m_l3RateTrace << "# "; // not necessary for R's read.table
    tracers.front()->PrintHeader(*outputStream);
    *outputStream << "\n";
  }

  g_tracers.push_back(boost::make_tuple(outputStream, tracers));
}

void
AppDelayTracer::Install(const NodeContainer& nodes, const std::string& file)
{
  using namespace boost;
  using namespace std;

  std::list<Ptr<AppDelayTracer>> tracers;
  boost::shared_ptr<std::ostream> outputStream;
  if (file != "-") {
    boost::shared_ptr<std::ofstream> os(new std::ofstream());
    os->open(file.c_str(), std::ios_base::out | std::ios_base::trunc);

    if (!os->is_open()) {
      NS_LOG_ERROR("File " << file << " cannot be opened for writing. Tracing disabled");
      return;
    }

    outputStream = os;
  }
  else {
    outputStream = boost::shared_ptr<std::ostream>(&std::cout, NullDeleter<std::ostream>);
  }

  for (NodeContainer::Iterator node = nodes.Begin(); node != nodes.End(); node++) {
    Ptr<AppDelayTracer> trace = Install(*node, outputStream);
    tracers.push_back(trace);
  }

  if (tracers.size() > 0) {
    // *m_l3RateTrace << "# "; // not necessary for R's read.table
    tracers.front()->PrintHeader(*outputStream);
    *outputStream << "\n";
  }

  g_tracers.push_back(boost::make_tuple(outputStream, tracers));
}

void
AppDelayTracer::Install(Ptr<Node> node, const std::string& file)
{
  using namespace boost;
  using namespace std;

  std::list<Ptr<AppDelayTracer>> tracers;
  boost::shared_ptr<std::ostream> outputStream;
  if (file != "-") {
    boost::shared_ptr<std::ofstream> os(new std::ofstream());
    os->open(file.c_str(), std::ios_base::out | std::ios_base::trunc);

    if (!os->is_open()) {
      NS_LOG_ERROR("File " << file << " cannot be opened for writing. Tracing disabled");
      return;
    }

    outputStream = os;
  }
  else {
    outputStream = boost::shared_ptr<std::ostream>(&std::cout, NullDeleter<std::ostream>);
  }

  Ptr<AppDelayTracer> trace = Install(node, outputStream);
  tracers.push_back(trace);

  if (tracers.size() > 0) {
    // *m_l3RateTrace << "# "; // not necessary for R's read.table
    tracers.front()->PrintHeader(*outputStream);
    *outputStream << "\n";
  }

  g_tracers.push_back(boost::make_tuple(outputStream, tracers));
}

Ptr<AppDelayTracer>
AppDelayTracer::Install(Ptr<Node> node, boost::shared_ptr<std::ostream> outputStream)
{
  NS_LOG_DEBUG("Node: " << node->GetId());

  Ptr<AppDelayTracer> trace = Create<AppDelayTracer>(outputStream, node);

  return trace;
}

//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////

AppDelayTracer::AppDelayTracer(boost::shared_ptr<std::ostream> os, Ptr<Node> node)
  : m_nodePtr(node)
  , m_os(os)
{
  m_node = boost::lexical_cast<string>(m_nodePtr->GetId());

  Connect();

  string name = Names::FindName(node);
  if (!name.empty()) {
    m_node = name;
  }
}

AppDelayTracer::AppDelayTracer(boost::shared_ptr<std::ostream> os, const std::string& node)
  : m_node(node)
  , m_os(os)
{
  Connect();
}

AppDelayTracer::~AppDelayTracer(){};

void
AppDelayTracer::Connect()
{
  Config::ConnectWithoutContext("/NodeList/" + m_node
                                  + "/ApplicationList/*/LastRetransmittedInterestDataDelay",
                                MakeCallback(&AppDelayTracer::LastRetransmittedInterestDataDelay,
                                             this));

  Config::ConnectWithoutContext("/NodeList/" + m_node + "/ApplicationList/*/FirstInterestDataDelay",
                                MakeCallback(&AppDelayTracer::FirstInterestDataDelay, this));
}

void
AppDelayTracer::PrintHeader(std::ostream& os) const
{
  os << "Time"
     << "\t"
     << "Node"
     << "\t"
     << "AppId"
     << "\t"
     << "SeqNo"
     << "\t"

     << "Type"
     << "\t"
     << "DelayS"
     << "\t"
     << "DelayUS"
     << "\t"
     << "RetxCount"
     << "\t"
     << "HopCount"
     << "";
}

void
AppDelayTracer::LastRetransmittedInterestDataDelay(Ptr<App> app, uint32_t seqno, Time delay,
                                                   int32_t hopCount)
{
  *m_os << Simulator::Now().ToDouble(Time::S) << "\t" << m_node << "\t" << app->GetId() << "\t"
        << seqno << "\t"
        << "LastDelay"
        << "\t" << delay.ToDouble(Time::S) << "\t" << delay.ToDouble(Time::US) << "\t" << 1 << "\t"
        << hopCount << "\n";
}

void
AppDelayTracer::FirstInterestDataDelay(Ptr<App> app, uint32_t seqno, Time delay, uint32_t retxCount,
                                       int32_t hopCount)
{
  *m_os << Simulator::Now().ToDouble(Time::S) << "\t" << m_node << "\t" << app->GetId() << "\t"
        << seqno << "\t"
        << "FullDelay"
        << "\t" << delay.ToDouble(Time::S) << "\t" << delay.ToDouble(Time::US) << "\t" << retxCount
        << "\t" << hopCount << "\n";
}

} // namespace ndn
} // namespace ns3