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

/*

 * Copyright (c) 2005,2006 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>

 */

#ifndef WIFI_PHY_STATE_HELPER_H

#define WIFI_PHY_STATE_HELPER_H

#include "wifi-phy.h"

#include "ns3/traced-callback.h"

#include "ns3/object.h"

#include <vector>

namespace ns3 {

class WifiPhyStateHelper : public Object

{

public:

  static TypeId GetTypeId (void);

  WifiPhyStateHelper ();

  void SetReceiveOkCallback (WifiPhy::RxOkCallback callback);

  void SetReceiveErrorCallback (WifiPhy::RxErrorCallback callback);

  void RegisterListener (WifiPhyListener *listener);

  enum WifiPhy::State GetState (void);

  bool IsStateCcaBusy (void);

  bool IsStateIdle (void);

  bool IsStateBusy (void);

  bool IsStateRx (void);

  bool IsStateTx (void);

  bool IsStateSwitching (void);

  Time GetStateDuration (void);

  Time GetDelayUntilIdle (void);

  Time GetLastRxStartTime (void) const;

  void SwitchToTx (Time txDuration, Ptr<const Packet> packet, WifiMode txMode, WifiPreamble preamble, uint8_t txPower);

  void SwitchToRx (Time rxDuration);

  void SwitchToChannelSwitching (Time switchingDuration); 

  void SwitchFromRxEndOk (Ptr<Packet> packet, double snr, WifiMode mode, enum WifiPreamble preamble);

  void SwitchFromRxEndError (Ptr<const Packet> packet, double snr);

  void SwitchMaybeToCcaBusy (Time duration);

  TracedCallback<Time,Time,enum WifiPhy::State> m_stateLogger;

private:

  typedef std::vector<WifiPhyListener *> Listeners;

  void LogPreviousIdleAndCcaBusyStates (void);

  void NotifyTxStart (Time duration);

  void NotifyWakeup (void);

  void NotifyRxStart (Time duration);

  void NotifyRxEndOk (void);

  void NotifyRxEndError (void);

  void NotifyMaybeCcaBusyStart (Time duration);

  void NotifySwitchingStart (Time duration); 

  void DoSwitchFromRx (void);

  bool m_rxing;

  Time m_endTx;

  Time m_endRx;

  Time m_endCcaBusy;

  Time m_endSwitching; 

  Time m_startTx;

  Time m_startRx;

  Time m_startCcaBusy;

  Time m_startSwitching; 

  Time m_previousStateChangeTime;

  Listeners m_listeners;

  TracedCallback<Ptr<const Packet>, double, WifiMode, enum WifiPreamble> m_rxOkTrace;

  TracedCallback<Ptr<const Packet>, double> m_rxErrorTrace;

  TracedCallback<Ptr<const Packet>,WifiMode,WifiPreamble,uint8_t> m_txTrace;

  WifiPhy::RxOkCallback m_rxOkCallback;

  WifiPhy::RxErrorCallback m_rxErrorCallback;

};

} // namespace ns3

#endif /* WIFI_PHY_STATE_HELPER_H */