/* -*- 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>
 */

#include "ccnx-pit-impl.h"
#include "ns3/log.h"
#include "ns3/string.h"
#include "ns3/uinteger.h"
#include "ns3/simulator.h"
#include "ccnx-interest-header.h"
#include "ccnx-content-object-header.h"

#include <boost/lambda/bind.hpp>
#include <boost/lambda/lambda.hpp>

NS_LOG_COMPONENT_DEFINE ("CcnxPitImpl");

using namespace boost::tuples;
using namespace boost;
namespace ll = boost::lambda;

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (CcnxPitImpl);

TypeId
CcnxPitImpl::GetTypeId ()
{
  static TypeId tid = TypeId ("ns3::CcnxPit")
    .SetGroupName ("Ccnx")
    .SetParent<CcnxPit> ()
    .AddConstructor<CcnxPitImpl> ()
    .AddAttribute ("MaxSize",
                   "Set maximum number of entries in PIT. If 0, limit is not enforced",
                   StringValue ("0"),
                   MakeUintegerAccessor (&CcnxPitImpl::GetMaxSize, &CcnxPitImpl::SetMaxSize),
                   MakeUintegerChecker<uint32_t> ())
    ;

  return tid;
}

CcnxPitImpl::CcnxPitImpl ()
{
}

CcnxPitImpl::~CcnxPitImpl ()
{
}

uint32_t
CcnxPitImpl::GetMaxSize () const
{
  return 0;
}

void
CcnxPitImpl::SetMaxSize (uint32_t maxSize)
{
}

void 
CcnxPitImpl::NotifyNewAggregate ()
{
  if (m_fib == 0)
    {
      m_fib = GetObject<CcnxFib> ();
    }
}

void 
CcnxPitImpl::DoDispose ()
{
  // clear ();
}

void
CcnxPitImpl::DoCleanExpired ()
{
  // NS_LOG_LOGIC ("Cleaning PIT. Total: " << size ());
  Time now = Simulator::Now ();

  // // uint32_t count = 0;
  // while (!empty ())
  //   {
  //     CcnxPit::index<i_timestamp>::type::iterator entry = get<i_timestamp> ().begin ();
  //     if (entry->GetExpireTime () <= now) // is the record stale?
  //       {
  //         get<i_timestamp> ().erase (entry);
  //         // count ++;
  //       }
  //     else
  //       break; // nothing else to do. All later records will not be stale
  //   }
}

Ptr<CcnxPitEntry>
CcnxPitImpl::Lookup (const CcnxContentObjectHeader &header) const
{
  return 0;
  // iterator entry = end ();

  // // do the longest prefix match
  // const CcnxNameComponents &name = header.GetName ();
  // for (size_t componentsCount = name.GetComponents ().size ()+1;
  //      componentsCount > 0;
  //      componentsCount--)
  //   {
  //     CcnxNameComponents subPrefix (name.GetSubComponents (componentsCount-1));

  //     entry = get<i_prefix> ().find (subPrefix);
  //     if (entry != end())
  //       return entry;
  //   }

  // return end ();
}

Ptr<CcnxPitEntry>
CcnxPitImpl::Lookup (const CcnxInterestHeader &header)
{
  return 0;
  // NS_LOG_FUNCTION (header.GetName ());
  // NS_ASSERT_MSG (m_fib != 0, "FIB should be set");

  // iterator entry = get<i_prefix> ().find (header.GetName ());
  // if (entry == end ())
  //   return end ();
   
  // return entry;
}

bool
CcnxPitImpl::CheckIfDuplicate (Ptr<CcnxPitEntry> entry, const CcnxInterestHeader &header)
{
  // if (!entry->IsNonceSeen (header.GetNonce ()))
  //   {
  //     modify (entry,
  //             boost::bind(&CcnxPitEntry::AddSeenNonce, ll::_1, header.GetNonce ()));
  //     return false;
  //   }
  // else
    // return true;
  return false;
}

Ptr<CcnxPitEntry>
CcnxPitImpl::Create (const CcnxInterestHeader &header)
{
  // NS_ASSERT_MSG (get<i_prefix> ().find (header.GetName ()) == end (),
  //                "Entry already exists, Create must not be called!!!");
  
  // if (m_maxSize > 0 &&
  //     size () >= m_maxSize)
  //   {
  //     // remove old record
  //     get<i_timestamp> ().erase (get<i_timestamp> ().begin ());
  //   }
      
  // Ptr<CcnxFibEntry> fibEntry = m_fib->LongestPrefixMatch (header);
  // // NS_ASSERT_MSG (fibEntry != m_fib->m_fib.end (),
  // //                "There should be at least default route set" << " Prefix = "<<header.GetName() << "NodeID == " << m_fib->GetObject<Node>()->GetId() << "\n" << *m_fib);

  // return insert (end (),
  //                CcnxPitEntry (ns3::Create<CcnxNameComponents> (header.GetName ()),
  //                              header.GetInterestLifetime ().IsZero ()?m_PitEntryDefaultLifetime
  //                              :                                       header.GetInterestLifetime (),
  //                              fibEntry));
  return 0;
}


void
CcnxPitImpl::MarkErased (Ptr<CcnxPitEntry> entry)
{
  // modify (entry,
  //         ll::bind (&CcnxPitEntry::SetExpireTime, ll::_1,
  //                   Simulator::Now () + m_PitEntryPruningTimout));
}


void
CcnxPitImpl::Print (std::ostream& os) const
{
  os << "Should be implemented soon\n";
  // BOOST_FOREACH (const CcnxPitEntry &entry, pit)
  //   {
  //     if (entry.m_incoming.size () == 0 && entry.m_outgoing.size () == 0)
  //       continue; // these are stale to-be-removed records, so there is no need to print them out
      
  //     os << entry << std::endl;
  //   }
}

} // namespace ns3