/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2011-2015  Regents of the University of California.
 *
 * This file is part of ndnSIM. See AUTHORS for complete list of ndnSIM authors and
 * contributors.
 *
 * ndnSIM is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * ndnSIM 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
 * ndnSIM, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 **/

#ifndef L2_TRACER_H
#define L2_TRACER_H

#include "ns3/ndnSIM/model/ndn-common.hpp"

#include "ns3/ptr.h"
#include "ns3/simple-ref-count.h"
#include "ns3/packet.h"

namespace ns3 {

class Node;

/**
 * @ingroup ndn-tracers
 * @brief Link-layer tracer
 *
 * @todo Finish implementation
 */
class L2Tracer : public SimpleRefCount<L2Tracer> {
public:
  L2Tracer(Ptr<Node> node);
  virtual ~L2Tracer(){};

  void
  Connect();

  virtual void
  PrintHeader(std::ostream& os) const = 0;

  virtual void
  Print(std::ostream& os) const = 0;

  virtual void
  Drop(Ptr<const Packet>) = 0;

  // Rx/Tx is NetDevice specific
  // please refer to pyviz.cc in order to extend this tracer

protected:
  std::string m_node;
  Ptr<Node> m_nodePtr;

  struct Stats {
    void
    Reset()
    {
      m_in = 0;
      m_out = 0;
      m_drop = 0;
    }

    uint64_t m_in;
    uint64_t m_out;
    uint64_t m_drop;
  };
};

inline std::ostream&
operator<<(std::ostream& os, const L2Tracer& tracer)
{
  os << "# ";
  tracer.PrintHeader(os);
  os << "\n";
  tracer.Print(os);
  return os;
}

} // namespace ns3

#endif // L2_TRACER_H