/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
 * Copyright (C) 2013 Regents of the University of California.
 * @author: Jeff Thompson <jefft0@remap.ucla.edu>
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_FORWARDING_ENTRY_HPP
#define NDN_FORWARDING_ENTRY_HPP

#include "name.hpp"
#include "forwarding-flags.hpp"
#include "encoding/block.hpp"

namespace ndn {

/**
 * An ForwardingEntry holds an action and  Name prefix and other fields for an forwarding entry.
 */
class ForwardingEntry {
public:    
  ForwardingEntry(const std::string& action,
                  const Name& prefix,
                  int faceId,
                  const ForwardingFlags& forwardingFlags,
                  int freshnessPeriod) 
    : action_(action)
    , prefix_(prefix)
    , faceId_(faceId)
    , forwardingFlags_(forwardingFlags)
    , freshnessPeriod_(freshnessPeriod)
  {
  }

  ForwardingEntry()
  : faceId_(-1)
  , freshnessPeriod_(-1)
  {
  }
  
  const std::string& 
  getAction() const { return action_; }

  void 
  setAction(const std::string& action) { action_ = action; wire_.reset(); }
    
  const Name& 
  getPrefix() const { return prefix_; }
  
  void
  setPrefix(const Name &prefix) { prefix_ = prefix; wire_.reset(); }
  
  int 
  getFaceId() const { return faceId_; }

  void 
  setFaceId(int faceId) { faceId_ = faceId; wire_.reset(); }
      
  const ForwardingFlags& 
  getForwardingFlags() const { return forwardingFlags_; }

  void 
  setForwardingFlags(const ForwardingFlags& forwardingFlags) { forwardingFlags_ = forwardingFlags; wire_.reset(); }
      
  int 
  getFreshnessPeriod() const { return freshnessPeriod_; }

  void 
  setFreshnessPeriod(int freshnessPeriod) { freshnessPeriod_ = freshnessPeriod; wire_.reset(); }

  inline const Block&
  wireEncode() const;
  
  inline void 
  wireDecode(const Block &wire);
  
private:
  std::string action_;   /**< empty for none. */
  Name prefix_;
  int faceId_;           /**< -1 for none. */
  ForwardingFlags forwardingFlags_;
  int freshnessPeriod_; /**< -1 for none. */

  mutable Block wire_;
};

inline const Block&
ForwardingEntry::wireEncode() const
{
  if (wire_.hasWire())
    return wire_;

  // ForwardingEntry ::= FORWARDING-ENTRY TLV-LENGTH
  //                       Action?
  //                       Name?
  //                       FaceID?
  //                       ForwardingFlags?
  //                       FreshnessPeriod?
  
  wire_ = Block(Tlv::FaceManagement::ForwardingEntry);

  // Action
  if (!action_.empty())
    {
      wire_.push_back
        (dataBlock(Tlv::FaceManagement::Action, action_.c_str(), action_.size()));
    }

  // Name
  if (!prefix_.empty())
    {
      wire_.push_back
        (prefix_.wireEncode());
    }

  // FaceID
  if (faceId_ >= 0)
    {
      wire_.push_back
        (nonNegativeIntegerBlock(Tlv::FaceManagement::FaceID, faceId_));
    }

  // ForwardingFlags
  wire_.push_back
    (forwardingFlags_.wireEncode());

  // FreshnessPeriod
  if (freshnessPeriod_ >= 0)
    {
      wire_.push_back
        (nonNegativeIntegerBlock(Tlv::FreshnessPeriod, freshnessPeriod_));
    }
  
  wire_.encode();
  return wire_;    
}
  
inline void 
ForwardingEntry::wireDecode(const Block &wire)
{
  action_.clear();
  prefix_.clear();
  faceId_ = -1;
  forwardingFlags_ = ForwardingFlags();
  freshnessPeriod_ = -1;

  wire_ = wire;
  wire_.parse();

  // ForwardingEntry ::= FORWARDING-ENTRY TLV-LENGTH
  //                       Action?
  //                       Name?
  //                       FaceID?
  //                       ForwardingFlags?
  //                       FreshnessPeriod?

  // Action
  Block::element_iterator val = wire_.find(Tlv::FaceManagement::Action);
  if (val != wire_.getAll().end())
    {
      action_ = std::string(reinterpret_cast<const char*>(val->value()), val->value_size());
    }

  // Name
  val = wire_.find(Tlv::Name);
  if (val != wire_.getAll().end())
    {
      prefix_.wireDecode(*val);
    }

  // FaceID
  val = wire_.find(Tlv::FaceManagement::FaceID);
  if (val != wire_.getAll().end())
    {
      faceId_ = readNonNegativeInteger(*val);
    }

  // ForwardingFlags
  val = wire_.find(Tlv::FaceManagement::ForwardingFlags);
  if (val != wire_.getAll().end())
    {
      forwardingFlags_.wireDecode(*val);
    }

  // FreshnessPeriod
  val = wire_.find(Tlv::FreshnessPeriod);
  if (val != wire_.getAll().end())
    {
      freshnessPeriod_ = readNonNegativeInteger(*val);
    }
}

inline std::ostream&
operator << (std::ostream &os, const ForwardingEntry &entry)
{
  os << "ForwardingEntry(";
  
  // Action
  if (!entry.getAction().empty())
    {
      os << "Action:" << entry.getAction() << ", ";
    }

  // Name
  if (!entry.getPrefix().empty())
    {
      os << "Prefix:" << entry.getPrefix() << ", ";
    }

  // FaceID
  if (entry.getFaceId() >= 0)
    {
      os << "FaceID:" << entry.getFaceId() << ", ";
    }

  // ForwardingFlags
  os << "ForwardingFlags:" << entry.getForwardingFlags() << ", ";

  // FreshnessPeriod
  if (entry.getFreshnessPeriod() >= 0)
    {
      os << "FreshnessPeriod:" << entry.getFreshnessPeriod() << ", ";
    }

  os << ")";
  return os;
}

}

#endif