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

/*

 * Copyright (c) 2008 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_MAC_H

#define WIFI_MAC_H

#include "ns3/packet.h"

#include "ns3/mac48-address.h"

#include "wifi-phy.h"

#include "wifi-remote-station-manager.h"

#include "ssid.h"

#include "qos-utils.h"

namespace ns3 {

class Dcf;

/**

 * \brief base class for all MAC-level wifi objects.

 *

 * This class encapsulates all the low-level MAC functionality

 * DCA, EDCA, etc) and all the high-level MAC functionality

 * (association/disassociation state machines).

 *

 */

class WifiMac : public Object

{

public:

  static TypeId GetTypeId (void);

  /**

   * \param slotTime the slot duration

   */

  virtual void SetSlot (Time slotTime) = 0;

  /**

   * \param sifs the sifs duration

   */

  virtual void SetSifs (Time sifs) = 0;

  /**

   * \param eifsNoDifs the duration of an EIFS minus DIFS.

   *

   * This value is used to calculate the EIFS depending

   * on AIFSN.

   */

  virtual void SetEifsNoDifs (Time eifsNoDifs) = 0;

  /**

   * \param pifs the pifs duration.

   */

  virtual void SetPifs (Time pifs) = 0;

  /**

   * \param ctsTimeout the duration of a CTS timeout.

   */

  virtual void SetCtsTimeout (Time ctsTimeout) = 0;

  /**

   * \param ackTimeout the duration of an ACK timeout.

   */

  virtual void SetAckTimeout (Time ackTimeout) = 0;

  /**

   * \param delay the max propagation delay.

   *

   * Unused for now.

   */

  void SetMaxPropagationDelay (Time delay);

  /**

   * \returns the current PIFS duration.

   */

  virtual Time GetPifs (void) const = 0;

  /**

   * \returns the current SIFS duration.

   */

  virtual Time GetSifs (void) const = 0;

  /**

   * \returns the current slot duration.

   */

  virtual Time GetSlot (void) const = 0;

  /**

   * \returns the current EIFS minus DIFS duration

   */

  virtual Time GetEifsNoDifs (void) const = 0;

  /**

   * \returns the current CTS timeout duration.

   */

  virtual Time GetCtsTimeout (void) const = 0;

  /**

   * \returns the current ACK timeout duration.

   */

  virtual Time GetAckTimeout (void) const = 0;

  /**

   * Unused for now.

   */

  Time GetMsduLifetime (void) const;

  /**

   * Unused for now.

   */

  Time GetMaxPropagationDelay (void) const;

  /**

   * \returns the maximum size of a MAC-level data payload.

   */

  uint32_t GetMaxMsduSize (void) const;

  /**

   * \returns the MAC address associated to this MAC layer.

   */

  virtual Mac48Address GetAddress (void) const = 0;

  /**

   * \returns the ssid which this MAC layer is going to try to stay in.

   */

  virtual Ssid GetSsid (void) const = 0;

  /**

   * \param address the current address of this MAC layer.

   */

  virtual void SetAddress (Mac48Address address) = 0;

  /**

   * \param ssid the current ssid of this MAC layer.

   */

  virtual void SetSsid (Ssid ssid) = 0;

  /**

   * \returns the bssid of the network this device belongs to.

   */

  virtual Mac48Address GetBssid (void) const = 0;

  /**

   * \param packet the packet to send.

   * \param to the address to which the packet should be sent.

   * \param from the address from which the packet should be sent.

   *

   * The packet should be enqueued in a tx queue, and should be

   * dequeued as soon as the DCF function determines that

   * access it granted to this MAC.  The extra parameter "from" allows

   * this device to operate in a bridged mode, forwarding received

   * frames without altering the source addresss.

   */

  virtual void Enqueue (Ptr<const Packet> packet, Mac48Address to, Mac48Address from) = 0;

  /**

   * \param packet the packet to send.

   * \param to the address to which the packet should be sent.

   *

   * The packet should be enqueued in a tx queue, and should be

   * dequeued as soon as the DCF function determines that

   * access it granted to this MAC.

   */

  virtual void Enqueue (Ptr<const Packet> packet, Mac48Address to) = 0;

  virtual bool SupportsSendFrom (void) const = 0;

  /**

   * \param phy the physical layer attached to this MAC.

   */

  virtual void SetWifiPhy (Ptr<WifiPhy> phy) = 0;

  /**

   * \param stationManager the station manager attached to this MAC.

   */

  virtual void SetWifiRemoteStationManager (Ptr<WifiRemoteStationManager> stationManager) = 0;

  /**

   * \param upCallback the callback to invoke when a packet must be forwarded up the stack.

   */

  virtual void SetForwardUpCallback (Callback<void,Ptr<Packet>, Mac48Address, Mac48Address> upCallback) = 0;

  /**

   * \param linkUp the callback to invoke when the link becomes up.

   */

  virtual void SetLinkUpCallback (Callback<void> linkUp) = 0;

  /**

   * \param linkDown the callback to invoke when the link becomes down.

   */

  virtual void SetLinkDownCallback (Callback<void> linkDown) = 0;

  /**

   * Public method used to fire a MacTx trace.  Implemented for encapsulation 

   * purposes.

   */

  void NotifyTx (Ptr<const Packet> packet);

  /**

   * Public method used to fire a MacTxDrop trace.  Implemented for encapsulation 

   * purposes.

   */

  void NotifyTxDrop (Ptr<const Packet> packet);

  /**

   * Public method used to fire a MacRx trace.  Implemented for encapsulation 

   * purposes.

   */

  void NotifyRx (Ptr<const Packet> packet);

  /**

   * Public method used to fire a MacPromiscRx trace.  Implemented for encapsulation 

   * purposes.

   */

  void NotifyPromiscRx (Ptr<const Packet> packet);

  /**

   * Public method used to fire a MacRxDrop trace.  Implemented for encapsulation 

   * purposes.

   */

  void NotifyRxDrop (Ptr<const Packet> packet);

  /**

   * \param standard the wifi standard to be configured

   */

  void ConfigureStandard (enum WifiPhyStandard standard);

protected:

  void ConfigureDcf (Ptr<Dcf> dcf, uint32_t cwmin, uint32_t cwmax, enum AccessClass ac);

  void ConfigureCCHDcf (Ptr<Dcf> dcf, uint32_t cwmin, uint32_t cwmax, enum AccessClass ac);

private:

  static Time GetDefaultMaxPropagationDelay (void);

  static Time GetDefaultSlot (void);

  static Time GetDefaultSifs (void);

  static Time GetDefaultEifsNoDifs (void);

  static Time GetDefaultCtsAckDelay (void);

  static Time GetDefaultCtsAckTimeout (void);

  /**

   * \param standard the phy standard to be used

   *

   * This method is called by ns3::WifiMac::ConfigureStandard to complete

   * the configuration process for a requested phy standard. Subclasses should

   * implement this method to configure their dcf queues according to the

   * requested standard.

   */

  virtual void FinishConfigureStandard (enum WifiPhyStandard standard) = 0;

  Time m_maxPropagationDelay;

  uint32_t m_maxMsduSize;

  void Configure80211a (void);

  void Configure80211b (void);

  void Configure80211_10Mhz (void);

  void Configure80211_5Mhz ();

  void Configure80211p_CCH (void);

  void Configure80211p_SCH (void);

  /**

   * The trace source fired when packets come into the "top" of the device

   * at the L3/L2 transition, before being queued for transmission.

   *

   * \see class CallBackTraceSource

   */

  TracedCallback<Ptr<const Packet> > m_macTxTrace;

  /**

   * The trace source fired when packets coming into the "top" of the device

   * are dropped at the MAC layer during transmission.

   *

   * \see class CallBackTraceSource

   */

  TracedCallback<Ptr<const Packet> > m_macTxDropTrace;

  /**

   * The trace source fired for packets successfully received by the device

   * immediately before being forwarded up to higher layers (at the L2/L3 

   * transition).  This is a promiscuous trace.

   *

   * \see class CallBackTraceSource

   */

  TracedCallback<Ptr<const Packet> > m_macPromiscRxTrace;

  /**

   * The trace source fired for packets successfully received by the device

   * immediately before being forwarded up to higher layers (at the L2/L3 

   * transition).  This is a non- promiscuous trace.

   *

   * \see class CallBackTraceSource

   */

  TracedCallback<Ptr<const Packet> > m_macRxTrace;

  /**

   * The trace source fired when packets coming into the "top" of the device

   * are dropped at the MAC layer during reception.

   *

   * \see class CallBackTraceSource

   */

  TracedCallback<Ptr<const Packet> > m_macRxDropTrace;

};

} // namespace ns3

#endif /* WIFI_MAC_H */