/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2011 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>
 */

#ifndef _NDN_H_
#define _NDN_H_

#include "ns3/object.h"
#include "ns3/callback.h"
#include "ns3/traced-callback.h"

namespace ns3 {

class Node;
class NetDevice;
class Packet;
class NdnForwardingStrategy;
class NdnFace;
class NdnContentObjectHeader;
class NdnInterestHeader;
class NdnPit;

/// @cond include_hidden
/**
 * \internal
 * \brief Private namespace for Ndn content store implementation
 */
namespace __ndn_private
{
class i_face {};
class i_metric {};
class i_nth {};
class i_prefix {};
class i_ordered {}; ///< tag for Boost.MultiIndex container (ordered by prefix)
class i_mru {};
}
/// @endcond

// default data size
// #define NDN_DEFAULT_DATA_SIZE   1024
// #define NDN_INTEREST_RESET_PERIOD	(10*MILLI_SECOND)

/**
 * \defgroup ndn NDN abstraction
 *
 * This is an abstract implementation of NDN protocol
 */
/**
 * \ingroup ndn
 * \brief Interface to manage Ndn stack
 *
 * This class defines the API to manipulate the following aspects of
 * the Ndn stack implementation:
 * -# register a face (NdnFace-derived object) for use by the Ndn
 *    layer
 * -# register forwarding strategy (NdnForwardingStrategy-derived
 *    object) to use by Ndn stack
 * -# export Ndn configuration attributes
 * 
 * Each NdnFace-derived object has conceptually a single Ndn
 * interface associated with it.
 *
 * In addition, this class defines Ndn packet coding constants
 *
 * \see NdnFace, NdnForwardingStrategy
 */
class Ndn : public Object
{
public:
  /**
   * \brief Interface ID
   *
   * \return interface ID
   */
  static TypeId GetTypeId ();
  virtual ~Ndn ();
  
  /**
   * \brief Add face to Ndn stack
   *
   * \param face smart pointer to NdnFace-derived object
   * (NdnLocalFace, NdnNetDeviceFace, NdnUdpFace) \returns the
   * index of the Ndn interface added.
   * 
   * \see NdnLocalFace, NdnNetDeviceFace, NdnUdpFace
   */
  virtual uint32_t
  AddFace (const Ptr<NdnFace> &face) = 0;

  /**
   * \brief Get current number of faces added to Ndn stack
   *
   * \returns the number of faces
   */
  virtual uint32_t
  GetNFaces (void) const = 0;

  /**
   * \brief Get face by face index
   * \param face The face number of an Ndn interface.
   * \returns The NdnFace associated with the Ndn face number.
   */
  virtual Ptr<NdnFace>
  GetFace (uint32_t face) const = 0;

  /**
   * \brief Remove face from ndn stack (remove callbacks)
   */
  virtual void
  RemoveFace (Ptr<NdnFace> face) = 0;

  /**
   * \brief Get face for NetDevice
   */
  virtual Ptr<NdnFace>
  GetFaceByNetDevice (Ptr<NetDevice> netDevice) const = 0;

  // /**
  //  * \enum DropReason
  //  * \brief A reason why the packet has been dropped
  //  */
  // enum DropReason
  //   {
  //     DUPLICATED, // Interests
  //     SUPPRESSED, // Interests and Nacks
  //     NO_FACES,    // Interests
  //     NON_DUPLICATED, // Nacks
  //     AFTER_SATISFIED, // Nacks
  //     UNSOLICITED,      // data
  //     PIT_LIMIT         // PIT limit reached
  //   };
  };

} // namespace ns3 

#endif /* _NDN_H_ */