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

/*

 * Copyright (c) 2004,2005,2006 INRIA

 *

 * This program is free software; you can redistribute it and/or modify

 * 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: Federico Maguolo <maguolof@dei.unipd.it>

 */

#include "cara-wifi-manager.h"

#include "ns3/assert.h"

#include "ns3/log.h"

#include "ns3/double.h"

#include "ns3/uinteger.h"

#include "ns3/simulator.h"

NS_LOG_COMPONENT_DEFINE ("Cara");

namespace ns3 {

struct CaraWifiRemoteStation : public WifiRemoteStation

{

  uint32_t m_timer;

  uint32_t m_success;

  uint32_t m_rate;

};

CaraWifiManager::GetTypeId (void)

{

}

CaraWifiManager::CaraWifiManager ()

  : WifiRemoteStationManager ()

CaraWifiManager::~CaraWifiManager ()

WifiRemoteStation *

CaraWifiManager::DoCreateStation (void) const

{

  CaraWifiRemoteStation *station = new CaraWifiRemoteStation ();

  station->m_rate = 0;

  station->m_success = 0;

  station->m_failed = 0;

  station->m_timer = 0;

  return station;

}

CaraWifiManager::DoReportRtsFailed (WifiRemoteStation *st)

CaraWifiManager::DoReportDataFailed (WifiRemoteStation *st)

{

  CaraWifiRemoteStation *station = (CaraWifiRemoteStation *) st;

  NS_LOG_FUNCTION (station);

  station->m_timer++;

  station->m_failed++;

  station->m_success = 0;

    {

      if (station->m_rate != 0)

        {

          station->m_rate--;

        }

      station->m_failed = 0;

      station->m_timer = 0;

    }

}

CaraWifiManager::DoReportRxOk (WifiRemoteStation *st,

CaraWifiManager::DoReportRtsOk (WifiRemoteStation *st,

{

}

CaraWifiManager::DoReportDataOk (WifiRemoteStation *st,

{

  CaraWifiRemoteStation *station = (CaraWifiRemoteStation *) st;

  station->m_timer++;

  station->m_success++;

  station->m_failed = 0;

    {

      if (station->m_rate < GetNSupported (station) - 1)

        {

          station->m_rate++;

        }

      station->m_timer = 0;

      station->m_success = 0;

    }

}

CaraWifiManager::DoReportFinalRtsFailed (WifiRemoteStation *st)

CaraWifiManager::DoReportFinalDataFailed (WifiRemoteStation *st)

WifiMode

CaraWifiManager::DoGetDataMode (WifiRemoteStation *st,

{

  CaraWifiRemoteStation *station = (CaraWifiRemoteStation *) st;

  return GetSupported (station, station->m_rate);

}

WifiMode

CaraWifiManager::DoGetRtsMode (WifiRemoteStation *st)

{

  // XXX: we could/should implement the Arf algorithm for

  // RTS only by picking a single rate within the BasicRateSet.

  return GetSupported (st, 0);

}

bool

CaraWifiManager::DoNeedRts (WifiRemoteStation *st,

{

  CaraWifiRemoteStation *station = (CaraWifiRemoteStation *) st;

  return normally || station->m_failed >= m_probeThreshold;

}

CaraWifiManager::IsLowLatency (void) const

{

  return true;

}

} // namespace ns3