/* -*-  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_NET_DEVICE_H

#define WIFI_NET_DEVICE_H

#include "ns3/net-device.h"

#include "ns3/packet.h"

#include "ns3/callback-trace-source.h"

#include "ns3/mac48-address.h"

#include "ssid.h"

#include <string>

namespace ns3 {

class WifiChannel;

class WifiPhy;

class MacStations;

class MacLow;

class MacRxMiddle;

class MacTxMiddle;

class MacParameters;

class DcaTxop;

class MacHighAdhoc;

class MacHighNqsta;

class MacHighNqap;

/**

 * \brief hold the type of trace event generated by 

 * a WifiNetDevice.

 */

class WifiNetDeviceTraceType : public TraceContextElement

{

public:

  enum Type {

    RX,

    TX

  };

  WifiNetDeviceTraceType ();

  WifiNetDeviceTraceType (enum Type type);

  /**

   * \returns the type of event

   */

  enum Type Get (void) const;

  static uint16_t GetUid (void);

  void Print (std::ostream &os) const;

  std::string GetTypeName (void) const;

private:

  enum Type m_type;

};

/**

 * \brief the base class for 802.11 network interfaces

 *

 */

class WifiNetDevice : public NetDevice {

public:

  virtual ~WifiNetDevice ();

  /**

   * \param channel the channel to connect this 802.11 

   *        interface to.

   */

  void ConnectTo (Ptr<WifiChannel> channel);

  /**

   * \returns the Mac48Address of this 802.11 interface.

   *

   * This method is equivalent to NetDevice::GetAddress. The only

   * difference is its return type.

   */

  Mac48Address GetSelfAddress (void) const;

  /**

   * \returns the bssid of this 802.11 interface.

   */

  virtual Mac48Address GetBssid (void) const = 0;

  /**

   * \returns the ssid of this 802.11 interface.

   */

  virtual Ssid GetSsid (void) const = 0;

private:

  // inherited from parent.

  virtual bool DoNeedsArp (void) const;

  virtual Ptr<Channel> DoGetChannel (void) const;

  virtual bool SendTo (const Packet &packet, const Address &to, uint16_t protocolNumber);

  virtual Ptr<TraceResolver> GetTraceResolver (void) const;

  // defined for children

  virtual void NotifyConnected (void) = 0;

  virtual bool DoSendTo (const Packet &packet, const Mac48Address &to) = 0;

  // private helper

  void Construct (void);

  friend class WifiNetDeviceFactory;

  CallbackTraceSource<Packet, Mac48Address> m_rxLogger;

  CallbackTraceSource<Packet, Mac48Address> m_txLogger;

protected:

  WifiNetDevice (Ptr<Node> node);

  void DoForwardUp (Packet packet, const Mac48Address &from);

  virtual void DoDispose (void);

  DcaTxop *CreateDca (uint32_t minCw, uint32_t maxCw) const;

  Ptr<WifiChannel> m_channel;

  MacStations *m_stations;

  MacLow *m_low;

  MacRxMiddle *m_rxMiddle;

  MacTxMiddle *m_txMiddle;

  MacParameters *m_parameters;

};

/**

 * \brief a 802.11 adhoc network interface

 *

 * This network interface is a very simple pass-through 

 * from the higher layers down to the MAC DCF layer.

 */

class AdhocWifiNetDevice : public WifiNetDevice {

public:

  AdhocWifiNetDevice (Ptr<Node> node);

  virtual ~AdhocWifiNetDevice ();

  virtual Mac48Address GetBssid (void) const;

  virtual Ssid GetSsid (void) const;

  void SetSsid (Ssid ssid);

protected:

  virtual void DoDispose (void);

private:

  void ForwardUp (void);

  virtual bool DoSendTo (const Packet &packet, Mac48Address const & to);

  virtual void NotifyConnected (void);

  Ssid m_ssid;

  DcaTxop *m_dca;

  MacHighAdhoc *m_high;

};

/**

 * \brief a 802.11 STA network interface 

 *

 * This network interface implements the MAC-level STA 

 * active probing, association, and disassociation prototols.

 *

 * By default, it starts a new probing phase whenever a new 

 * data packet must be sent and the STA is not yet associated

 * to the AP.

 */

class NqstaWifiNetDevice : public WifiNetDevice 

{

public:

  NqstaWifiNetDevice (Ptr<Node> node);

  virtual ~NqstaWifiNetDevice ();

  virtual Mac48Address GetBssid (void) const;

  virtual Ssid GetSsid (void) const;

  /**

   * \param ssid the ssid we want to associate with

   *

   * Start a new active probing phase with the specified

   * ssid.

   */

  void StartActiveAssociation (Ssid ssid);

protected:

  virtual void DoDispose (void);

private:

  void Associated (void);

  void DisAssociated (void);

  virtual bool DoSendTo (const Packet &packet, Mac48Address const & to);

  virtual void NotifyConnected (void);

  friend class WifiNetDeviceFactory;

  Ssid m_ssid;

  DcaTxop *m_dca;

  MacHighNqsta *m_high;

};

/**

 * \brief a 802.11 AP network interface

 *

 * This network interface implements the MAC-level

 * AP-side of the beacon, probing, and, association

 * protocols. By default, every STA which tries

 * to associate is accepted.

 */

class NqapWifiNetDevice : public WifiNetDevice 

{

public:

  NqapWifiNetDevice (Ptr<Node> node);

  virtual ~NqapWifiNetDevice ();

  virtual Mac48Address GetBssid (void) const;

  virtual Ssid GetSsid (void) const;

  void SetSsid (Ssid ssid);

protected:

  virtual void DoDispose (void);

private:

  virtual bool DoSendTo (const Packet &packet, Mac48Address const & to);

  virtual void NotifyConnected (void);

  friend class WifiNetDeviceFactory;

  Ssid m_ssid;

  DcaTxop *m_dca;

  MacHighNqap *m_high;

};

} // namespace ns3

#endif /* WIFI_NET_DEVICE_H */