/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2009 CTTC

 *

 * 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: Nicola Baldo <nbaldo@cttc.es>

 */

#include "spectrum-error-model.h"

#include <ns3/nstime.h>

#include <ns3/log.h>

NS_LOG_COMPONENT_DEFINE ("ShannonSpectrumErrorModel");

namespace ns3 {

SpectrumErrorModel::~SpectrumErrorModel ()

{

}

void

ShannonSpectrumErrorModel::DoDispose ()

{

  NS_LOG_FUNCTION (this);

  SpectrumErrorModel::DoDispose ();

}

void

ShannonSpectrumErrorModel::StartRx (Ptr<const Packet> p)

{

  NS_LOG_FUNCTION (this);

  m_bytes = p->GetSize ();

  NS_LOG_LOGIC ("bytes to deliver: " << m_bytes);

  m_deliverableBytes = 0;

}

void

ShannonSpectrumErrorModel::EvaluateChunk (const SpectrumValue& sinr, Time duration)

{

  NS_LOG_FUNCTION (this << sinr << duration);

  SpectrumValue CapacityPerHertz = Log2 (1 + sinr);

  double capacity = 0;

  Bands::const_iterator bi = CapacityPerHertz.ConstBandsBegin ();

  Values::const_iterator vi = CapacityPerHertz.ConstValuesBegin ();

  while (bi != CapacityPerHertz.ConstBandsEnd ())

    {

      NS_ASSERT (vi != CapacityPerHertz.ConstValuesEnd ());

      capacity += (bi->fh - bi->fl) * (*vi);

      ++bi;

      ++vi;

    }

  NS_ASSERT (vi == CapacityPerHertz.ConstValuesEnd ());

  NS_LOG_LOGIC ("ChunkCapacity = " << capacity);

  m_deliverableBytes += capacity * duration.GetSeconds () / 8;

  NS_LOG_LOGIC ("DeliverableBytes = " << m_deliverableBytes);

}

bool

ShannonSpectrumErrorModel::IsRxCorrect ()

{

  NS_LOG_FUNCTION (this);

  return (m_deliverableBytes > m_bytes);

}

} // namespace ns3