/* -*- 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 _CCNX_H_
#define _CCNX_H_

#include "ns3/object.h"
#include "ns3/socket.h"
#include "ns3/callback.h"

#include "ccnx-face.h"

namespace ns3 {

class Node;
class NetDevice;
class Packet;
class CcnxForwardingStrategy;

/**
 * \defgroup ccnx NDN abstraction
 *
 * This is an abstract implementation of NDN protocol
 */
/**
 * \ingroup ccnx
 * \brief Interface to manage Ccnx stack
 *
 * This class defines the API to manipulate the following aspects of
 * the Ccnx stack implementation:
 * -# register a face (CcnxFace-derived object) for use by the Ccnx
 *    layer
 * -# register forwarding strategy (CcnxForwardingStrategy-derived
 *    object) to use by Ccnx stack
 * -# export Ccnx configuration attributes
 * 
 * Each CcnxFace-derived object has conceptually a single Ccnx
 * interface associated with it.
 *
 * In addition, this class defines CCNx packet coding constants
 *
 * \see CcnxFace, CcnxForwardingStrategy
 */
class Ccnx : public Object
{
public:
  /**
   * \brief Interface ID
   *
   * \return interface ID
   */
  static TypeId GetTypeId ();

  /**
   * \brief Register a new forwarding strategy to be used by this Ccnx
   * stack
   *
   * This call will replace any forwarding strategy that has been
   * previously registered.
   * 
   * \param forwardingStrategy smart pointer to CcnxForwardingStrategy
   * object
   */
  virtual void SetForwardingStrategy (Ptr<CcnxForwardingStrategy> forwardingStrategy) = 0;

  /**
   * \brief Get the forwarding strategy being used by this Ccnx stack
   * 
   * \returns smart pointer to CcnxForwardingStrategy object, or null
   * pointer if none
   */
  virtual Ptr<CcnxForwardingStrategy> GetForwardingStrategy (void) const = 0;

  /**
   * \brief Add face to CCNx stack
   *
   * \param face smart pointer to CcnxFace-derived object
   * (CcnxLocalFace, CcnxNetDeviceFace, CcnxUdpFace) \returns the
   * index of the Ccnx interface added.
   * 
   * \see CcnxLocalFace, CcnxNetDeviceFace, CcnxUdpFace
   */
  virtual uint32_t AddFace (const Ptr<CcnxFace> &face) = 0;

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

  /**
   * \brief Send a packet to a specified face
   *
   * \param face face where to send this packet
   * \param packet fully prepared CCNx packet to send
   *
   * Higher-level layers (forwarding strategy in particular) call this
   * method to send a packet down the stack to the MAC and PHY layers.
   */
  virtual void Send (const Ptr<CcnxFace> &face, Ptr<Packet> packet) = 0;

  /**
   * \brief Lower layers calls this method after demultiplexing
   *
   * Lower-layer-dependent implementation of CcnxFace will do actual work
   * to set up demultiplexing and call this function as a callback
   *
   * \param face face from which packet came from
   * \param p the packet
   */
  void ReceiveFromLower (const Ptr<Face> &device, Ptr<const Packet> p);

  /**
   * \param face The face number of an Ccnx interface.
   * \returns The CcnxFace associated with the Ccnx face number.
   */
  virtual Ptr<CcnxFace> GetFace (uint32_t face) const = 0;

public:
   /**
   * \brief Type tag for a ccnb start marker.
   *
   * \see http://www.ccnx.org/releases/latest/doc/technical/DTAG.html
   */
  enum ccn_tt {
    CCN_EXT,        /**< starts composite extension - numval is subtype */
    CCN_TAG,        /**< starts composite - numval is tagnamelen-1 */ 
    CCN_DTAG,       /**< starts composite - numval is tagdict index (enum ccn_dtag) */
    CCN_ATTR,       /**< attribute - numval is attrnamelen-1, value follows */
    CCN_DATTR,      /**< attribute numval is attrdict index */
    CCN_BLOB,       /**< opaque binary data - numval is byte count */
    CCN_UDATA,      /**< UTF-8 encoded character data - numval is byte count */
    CCN_NO_TOKEN    /**< should not occur in encoding */
  };

  /** \brief CCN_CLOSE terminates composites */
  enum {CCN_CLOSE = 0};

  /**
   * \brief DTAG identifies ccnb-encoded elements.
   *
   * \see http://www.ccnx.org/releases/latest/doc/technical/DTAG.html
   */
  enum ccn_dtag {
    CCN_DTAG_Any = 13,
    CCN_DTAG_Name = 14,
    CCN_DTAG_Component = 15,
    CCN_DTAG_Certificate = 16,
    CCN_DTAG_Collection = 17,
    CCN_DTAG_CompleteName = 18,
    CCN_DTAG_Content = 19,
    CCN_DTAG_SignedInfo = 20,
    CCN_DTAG_ContentDigest = 21,
    CCN_DTAG_ContentHash = 22,
    CCN_DTAG_Count = 24,
    CCN_DTAG_Header = 25,
    CCN_DTAG_Interest = 26,	/* 20090915 */
    CCN_DTAG_Key = 27,
    CCN_DTAG_KeyLocator = 28,
    CCN_DTAG_KeyName = 29,
    CCN_DTAG_Length = 30,
    CCN_DTAG_Link = 31,
    CCN_DTAG_LinkAuthenticator = 32,
    CCN_DTAG_NameComponentCount = 33,	/* DeprecatedInInterest */
    CCN_DTAG_RootDigest = 36,
    CCN_DTAG_Signature = 37,
    CCN_DTAG_Start = 38,
    CCN_DTAG_Timestamp = 39,
    CCN_DTAG_Type = 40,
    CCN_DTAG_Nonce = 41,
    CCN_DTAG_Scope = 42,
    CCN_DTAG_Exclude = 43,
    CCN_DTAG_Bloom = 44,
    CCN_DTAG_BloomSeed = 45,
    CCN_DTAG_AnswerOriginKind = 47,
    CCN_DTAG_InterestLifetime = 48,
    CCN_DTAG_Witness = 53,
    CCN_DTAG_SignatureBits = 54,
    CCN_DTAG_DigestAlgorithm = 55,
    CCN_DTAG_BlockSize = 56,
    CCN_DTAG_FreshnessSeconds = 58,
    CCN_DTAG_FinalBlockID = 59,
    CCN_DTAG_PublisherPublicKeyDigest = 60,
    CCN_DTAG_PublisherCertificateDigest = 61,
    CCN_DTAG_PublisherIssuerKeyDigest = 62,
    CCN_DTAG_PublisherIssuerCertificateDigest = 63,
    CCN_DTAG_ContentObject = 64,	/* 20090915 */
    CCN_DTAG_WrappedKey = 65,
    CCN_DTAG_WrappingKeyIdentifier = 66,
    CCN_DTAG_WrapAlgorithm = 67,
    CCN_DTAG_KeyAlgorithm = 68,
    CCN_DTAG_Label = 69,
    CCN_DTAG_EncryptedKey = 70,
    CCN_DTAG_EncryptedNonceKey = 71,
    CCN_DTAG_WrappingKeyName = 72,
    CCN_DTAG_Action = 73,
    CCN_DTAG_FaceID = 74,
    CCN_DTAG_IPProto = 75,
    CCN_DTAG_Host = 76,
    CCN_DTAG_Port = 77,
    CCN_DTAG_MulticastInterface = 78,
    CCN_DTAG_ForwardingFlags = 79,
    CCN_DTAG_FaceInstance = 80,
    CCN_DTAG_ForwardingEntry = 81,
    CCN_DTAG_MulticastTTL = 82,
    CCN_DTAG_MinSuffixComponents = 83,
    CCN_DTAG_MaxSuffixComponents = 84,
    CCN_DTAG_ChildSelector = 85,
    CCN_DTAG_RepositoryInfo = 86,
    CCN_DTAG_Version = 87,
    CCN_DTAG_RepositoryVersion = 88,
    CCN_DTAG_GlobalPrefix = 89,
    CCN_DTAG_LocalName = 90,
    CCN_DTAG_Policy = 91,
    CCN_DTAG_Namespace = 92,
    CCN_DTAG_GlobalPrefixName = 93,
    CCN_DTAG_PolicyVersion = 94,
    CCN_DTAG_KeyValueSet = 95,
    CCN_DTAG_KeyValuePair = 96,
    CCN_DTAG_IntegerValue = 97,
    CCN_DTAG_DecimalValue = 98,
    CCN_DTAG_StringValue = 99,
    CCN_DTAG_BinaryValue = 100,
    CCN_DTAG_NameValue = 101,
    CCN_DTAG_Entry = 102,
    CCN_DTAG_ACL = 103,
    CCN_DTAG_ParameterizedName = 104,
    CCN_DTAG_Prefix = 105,
    CCN_DTAG_Suffix = 106,
    CCN_DTAG_Root = 107,
    CCN_DTAG_ProfileName = 108,
    CCN_DTAG_Parameters = 109,
    CCN_DTAG_InfoString = 110,
    CCN_DTAG_StatusResponse = 112,
    CCN_DTAG_StatusCode = 113,
    CCN_DTAG_StatusText = 114,
    CCN_DTAG_SequenceNumber = 256,
    CCN_DTAG_CCNProtocolDataUnit = 17702112
  };
};

} // namespace ns3 

#endif /* _CCNX_H_ */