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

/*

 * Copyright (c) 2003,2007 INRIA

 *

 * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "amrr-mac-stations.h"

#include "ns3/default-value.h"

#include "ns3/time-default-value.h"

#include "ns3/simulator.h"

#include "ns3/log.h"

NS_LOG_COMPONENT_DEFINE ("AmrrMacStation");

namespace ns3 {

static TimeDefaultValue g_updatePeriod

("WifiAmrrUpdatePeriod",

 "The interval between decisions about rate control changes",

 Seconds (1.0));

AmrrMacStations::AmrrMacStations (WifiMode defaultTxMode)

  : MacStations (defaultTxMode),

    m_updatePeriod (g_updatePeriod.GetValue ())

{}

MacStation *

AmrrMacStations::CreateStation (void)

{

  return new AmrrMacStation (this);

}

AmrrMacStation::AmrrMacStation (AmrrMacStations *stations)

  : m_stations (stations),

    m_nextModeUpdate (Simulator::Now () + stations->m_updatePeriod),

    m_shortRetry (0),

    m_longRetry (0),

    m_tx_ok (0),

    m_tx_err (0),

    m_tx_retr (0),

    m_tx_upper (0)

{}

AmrrMacStation::~AmrrMacStation ()

{}

void 

AmrrMacStation::ReportRxOk (double rxSnr, WifiMode txMode)

{}

void 

AmrrMacStation::ReportRtsFailed (void)

{

  m_shortRetry++;

}

void 

AmrrMacStation::ReportDataFailed (void)

{

  m_longRetry++;

}

void 

AmrrMacStation::ReportRtsOk (double ctsSnr, WifiMode ctsMode, double rtsSnr)

{}

void 

AmrrMacStation::ReportDataOk (double ackSnr, WifiMode ackMode, double dataSnr)

{

  UpdateRetry ();

  m_tx_ok++;

}

void 

AmrrMacStation::ReportFinalRtsFailed (void)

{

  UpdateRetry ();

  m_tx_err++;

}

void 

AmrrMacStation::ReportFinalDataFailed (void)

{

  UpdateRetry ();

  m_tx_err++;

}

void

AmrrMacStation::UpdateRetry (void)

{

  m_tx_retr += m_shortRetry + m_longRetry;

  m_shortRetry = 0;

  m_longRetry = 0;

}

void

AmrrMacStation::UpdateMode (void)

{

  if (Simulator::Now () < m_nextModeUpdate)

    {

      return;

    }

}

AmrrMacStations *

AmrrMacStation::GetStations (void) const

{

  return m_stations;

}

WifiMode 

AmrrMacStation::DoGetDataMode (uint32_t size)

{

  UpdateMode ();

  //XXX

  return GetSupportedMode (0);

}

WifiMode 

AmrrMacStation::DoGetRtsMode (void)

{

  UpdateMode ();

  // XXX: can we implement something smarter ?

  return GetSupportedMode (0);

}

} // namespace ns3