/* -*-  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 NQSTA_WIFI_MAC_H

#define NQSTA_WIFI_MAC_H

#include <stdint.h>

#include "ns3/mac48-address.h"

#include "ns3/callback.h"

#include "ns3/event-id.h"

#include "ns3/packet.h"

#include "ns3/nstime.h"

#include "wifi-mac.h"

#include "supported-rates.h"

namespace ns3 {

class WifiMacHeader;

class DcaTxop;

class WifiPhy;

class DcfManager;

class MacLow;

class MacRxMiddle;

/**

 * \brief a non-QoS STA state machine

 *

 * This state machine handles association, disassociation,

 * authentication and beacon monitoring. It does not perform

 * channel scanning.

 * If the station detects a certain number of missed beacons

 * while associated, it automatically attempts a new association

 * sequence.

 */

class NqstaWifiMac : public WifiMac

{

public:

  static TypeId GetTypeId (void);

  NqstaWifiMac ();

  ~NqstaWifiMac ();

  // inherited from WifiMac.

  virtual void SetSlot (Time slotTime);

  virtual void SetSifs (Time sifs);

  virtual void SetEifsNoDifs (Time eifsNoDifs);

  virtual Time GetSlot (void) const;

  virtual Time GetSifs (void) const;

  virtual Time GetEifsNoDifs (void) const;

  virtual void SetWifiPhy (Ptr<WifiPhy> phy);

  virtual void SetWifiRemoteStationManager (Ptr<WifiRemoteStationManager> stationManager);

  virtual void Enqueue (Ptr<const Packet> packet, Mac48Address to, Mac48Address from);

  virtual void SetForwardUpCallback (Callback<void,Ptr<Packet>, const Mac48Address &> upCallback);

  virtual void SetLinkUpCallback (Callback<void> linkUp);

  virtual void SetLinkDownCallback (Callback<void> linkDown);

  virtual Mac48Address GetAddress (void) const;

  virtual Ssid GetSsid (void) const;

  virtual Mac48Address GetBssid (void) const;

  virtual void SetAddress (Mac48Address address);

  virtual void SetSsid (Ssid ssid);

  /**

   * \param missed the number of beacons which must be missed

   * before a new association sequence is started.

   */

  void SetMaxMissedBeacons (uint32_t missed);

  /**

   * \param timeout

   *

   * If no probe response is received within the specified

   * timeout, the station sends a new probe request.

   */

  void SetProbeRequestTimeout (Time timeout);

  /**

   * \param timeout

   *

   * If no association response is received within the specified

   * timeout, the station sends a new association request.

   */

  void SetAssocRequestTimeout (Time timeout);

  /**

   * Start an active association sequence immediately.

   */

  void StartActiveAssociation (void);

private:

  void SetBssid (Mac48Address bssid);

  void SetActiveProbing (bool enable);

  bool GetActiveProbing (void) const;

  void ForwardUp (Ptr<Packet> packet, const Mac48Address &address);

  void Receive (Ptr<Packet> packet, WifiMacHeader const *hdr);

  Mac48Address GetBroadcastBssid (void);

  void SendProbeRequest (void);

  void SendAssociationRequest (void);

  void TryToEnsureAssociated (void);

  void AssocRequestTimeout (void);

  void ProbeRequestTimeout (void);

  bool IsAssociated (void);

  void MissedBeacons (void);

  void RestartBeaconWatchdog (Time delay);

  SupportedRates GetSupportedRates (void) const;

  virtual void DoDispose (void);

  NqstaWifiMac (const NqstaWifiMac & ctor_arg);

  enum {

    ASSOCIATED,

    WAIT_PROBE_RESP,

    WAIT_ASSOC_RESP,

    BEACON_MISSED,

    REFUSED

  } m_state;

  Time m_probeRequestTimeout;

  Time m_assocRequestTimeout;

  EventId m_probeRequestEvent;

  EventId m_assocRequestEvent;

  Callback<void, Ptr<Packet>,const Mac48Address &> m_forwardUp;

  Callback<void> m_linkUp;

  Callback<void> m_linkDown;

  Ptr<DcaTxop> m_dca;

  EventId m_beaconWatchdog;

  Time m_beaconWatchdogEnd;

  Mac48Address m_bssid;

  uint32_t m_maxMissedBeacons;

  Ptr<WifiPhy> m_phy;

  Ptr<WifiRemoteStationManager> m_stationManager;

  DcfManager *m_dcfManager;

  MacRxMiddle *m_rxMiddle;

  Ptr<MacLow> m_low;

  Mac48Address m_address;

  Ssid m_ssid;

  Time m_slot;

  Time m_sifs;

  Time m_eifsNoDifs;

};

} // namespace ns3

#endif /* NQSTA_WIFI_MAC_H */