/* -*- 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: Ilya Moiseenko <iliamo@cs.ucla.edu>
 *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 */

#ifndef _CCNX_CONTENT_OBJECT_HEADER_H_
#define _CCNX_CONTENT_OBJECT_HEADER_H_

#include "ns3/integer.h"
#include "ns3/header.h"
#include "ns3/simple-ref-count.h"
#include "ns3/trailer.h"
#include "ns3/nstime.h"

#include <string>
#include <vector>
#include <list>

#include "ccnx-name-components.h"

namespace ns3
{

/**
 * CCNx XML definition of ContentObject
 * 
 * Only few important fields are actually implemented in the simulation
 *
 *
 * ContentObjectHeader serializes/deserializes header up-to and including <Content> tags
 * Necessary closing tags should be added using ContentObjectTail
 *
 * This hacks are necessary to optimize memory use (i.e., virtual payload)
 *
 * "<ContentObject><Signature>..</Signature><Name>...</Name><SignedInfo>...</SignedInfo><Content>"
 * 
 */
  
class CcnxContentObjectHeader : public SimpleRefCount<CcnxContentObjectHeader,Header>
{
public:
  /**
   * Constructor
   *
   * Creates a null header
   **/
  CcnxContentObjectHeader ();

  /**
   * \brief Set interest name
   *
   * Sets name of the interest. For example, SetName( CcnxNameComponents("prefix")("postfix") );
   **/
  void
  SetName (const Ptr<CcnxNameComponents> &name);

  const CcnxNameComponents&
  GetName () const;

  // void
  // SetSignature ();

  // ?
  // GetSignature () const;

  void
  SetTimestamp (const Time &timestamp);

  Time
  GetTimestamp () const;
  
  void
  SetFreshness (const Time &freshness);

  Time
  GetFreshness () const;
  
  //////////////////////////////////////////////////////////////////
  
  static TypeId GetTypeId (void);
  virtual TypeId GetInstanceTypeId (void) const;
  virtual void Print (std::ostream &os) const;
  virtual uint32_t GetSerializedSize (void) const;
  virtual void Serialize (Buffer::Iterator start) const;
  virtual uint32_t Deserialize (Buffer::Iterator start);

  struct SignedInfo
  {
    // PublisherPublicKeyDigest
    Time m_timestamp;
    // Type (ContentType)
    Time m_freshness;
    // FinalBlockID
    // KeyLocator
  };
  
private:
  // m_signature;
  Ptr<CcnxNameComponents> m_name;
  SignedInfo m_signedInfo;
};

/**
 * ContentObjectTail should always be 2 bytes, representing two closing tags:
 * "</Content><ContentObject>"
 */
class CcnxContentObjectTail : public Trailer
{
public:
  CcnxContentObjectTail ();
  //////////////////////////////////////////////////////////////////
  
  static TypeId GetTypeId (void);
  virtual TypeId GetInstanceTypeId (void) const;
  virtual void Print (std::ostream &os) const;
  virtual uint32_t GetSerializedSize (void) const;
  virtual void Serialize (Buffer::Iterator start) const;
  virtual uint32_t Deserialize (Buffer::Iterator start);
};

class CcnxContentObjectHeaderException {};
  
} // namespace ns3

#endif // _CCNX_CONTENT_OBJECT_HEADER_H_