/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2011 UCLA
 *
 * 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>
 *          Ilya Moiseenko <iliamo@cs.ucla.edu> 
 */

#ifndef CCNX_STACK_HELPER_H
#define CCNX_STACK_HELPER_H

#include "ns3/packet.h"
#include "ns3/ptr.h"
#include "ns3/object-factory.h"
#include "ns3/nstime.h"

namespace ns3 {

class Node;
class CcnxFaceContainer;
class CcnxFace;

/**
 * \ingroup ccnx
 * \defgroup ccnx-helpers Helpers
 */
/**
 * \ingroup ccnx-helpers
 * \brief Adding CCNx functionality to existing Nodes.
 *
 * This helper enables pcap and ascii tracing of events in the ccnx stack
 * associated with a node.  This is substantially similar to the tracing that
 * happens in device helpers, but the important difference is that, well, there
 * is no device.  This means that the creation of output file names will change,
 * and also the user-visible methods will not reference devices and therefore
 * the number of trace enable methods is reduced.
 *
 * Normally we eschew multiple inheritance, however, the classes
 * PcapUserHelperForCcnx and AsciiTraceUserHelperForCcnx are treated as
 * "mixins".  A mixin is a self-contained class that encapsulates a general
 * attribute or a set of functionality that may be of interest to many other
 * classes.
 */
class CcnxStackHelper 
{
public:
  /**
   * \brief Create a new CcnxStackHelper with a default NDN_FLOODING forwarding stategy
   */
  CcnxStackHelper();
  
  /**
   * \brief Destroy the CcnxStackHelper
   */
  virtual ~CcnxStackHelper ();

  /**
   * @brief Set forwarding strategy helper
   *
   * \param forwarding a new forwarding helper
   *
   * Set the forwarding helper to use during Install. The forwarding helper is
   * really an object factory which is used to create an object of type
   * ns3::CcnxL3Protocol per node. This forwarding object is then associated to
   * a single ns3::Ccnx object through its ns3::Ccnx::SetforwardingProtocol.
   */
  void
  SetForwardingStrategy (std::string forwardingStrategy);

  /**
   * @brief Enable Interest limits (disabled by default)
   *
   * @param enable           Enable or disable limits
   * @param avgRtt           Average RTT
   * @param avgContentObject Average size of contentObject packets (including all headers)
   * @param avgInterest      Average size of interest packets (including all headers)
   */
  void
  EnableLimits (bool enable = true, Time avgRtt=Seconds(0.1), uint32_t avgContentObject=1100, uint32_t avgInterest=40);
  
  /**
   * \brief Install CCNx stack on the node
   *
   * This method will assert if called on a node that already has Ccnx object
   * installed on it
   * 
   * \param nodeName The name of the node on which to install the stack.
   *
   * \returns list of installed faces in the form of a smart pointer
   * to CcnxFaceContainer object
   */
  Ptr<CcnxFaceContainer>
  Install (std::string nodeName) const;

  /**
   * \brief Install CCNx stack on the node
   *
   * This method will assert if called on a node that already has Ccnx object
   * installed on it
   * 
   * \param node The node on which to install the stack.
   *
   * \returns list of installed faces in the form of a smart pointer
   * to CcnxFaceContainer object
   */
  Ptr<CcnxFaceContainer>
  Install (Ptr<Node> node) const;

  /**
   * \brief Install CCNx stack on each node in the input container
   *
   * The program will assert if this method is called on a container with a node
   * that already has an ccnx object aggregated to it.
   * 
   * \param c NodeContainer that holds the set of nodes on which to install the
   * new stacks.
   *
   * \returns list of installed faces in the form of a smart pointer
   * to CcnxFaceContainer object
   */
  Ptr<CcnxFaceContainer>
  Install (NodeContainer c) const;

  /**
   * \brief Install CCNx stack on all nodes in the simulation
   *
   * \returns list of installed faces in the form of a smart pointer
   * to CcnxFaceContainer object
   */
  Ptr<CcnxFaceContainer>
  InstallAll () const;

  /**
   * \brief Add forwarding entry in FIB
   *
   * \param nodeName Node name
   * \param prefix Routing prefix
   * \param faceId Face index
   * \param metric Routing metric
   */
  static void
  AddRoute (std::string nodeName, std::string prefix, uint32_t faceId, int32_t metric);

  /**
   * \brief Add forwarding entry in FIB
   *
   * \param node   Node
   * \param prefix Routing prefix
   * \param face   Face
   * \param metric Routing metric
   */
  static void
  AddRoute (Ptr<Node> node, std::string prefix, Ptr<CcnxFace> face, int32_t metric);

  /**
   * \brief Set flag indicating necessity to install default routes in FIB
   */
  void
  SetDefaultRoutes (bool needSet);

private:
  CcnxStackHelper (const CcnxStackHelper &);
  CcnxStackHelper &operator = (const CcnxStackHelper &o);
  
private:
  ObjectFactory m_strategyFactory;
  bool m_limitsEnabled;
  Time     m_avgRtt;
  uint32_t m_avgContentObjectSize;
  uint32_t m_avgInterestSize;
  bool m_needSetDefaultRoutes;  
};

} // namespace ns3

#endif /* CCNX_STACK_HELPER_H */