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

/*

 * Copyright (c) 2006,2007 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_CHANNEL_H

#define WIFI_CHANNEL_H

#include <vector>

#include <stdint.h>

#include "ns3/packet.h"

#include "ns3/channel.h"

#include "wifi-mode.h"

#include "wifi-preamble.h"

namespace ns3 {

class NetDevice;

class PropagationLossModel;

class PropagationDelayModel;

/**

 * \brief A 802.11 Channel

 *

 * This channel subclass can be used to connect together a set of 

 * ns3::WifiNetDevice network interfaces. A WifiChannel contains

 * a PropagationLossModel and a PropagationDelayModel which can

 * be overriden by the WifiChannel::SetPropagationLossModel

 * and the WifiChannel::SetPropagationDelayModel methods. By default,

 * The PropagationDelayModel is a ns3::ConstantSpeedPropagationModel,

 * and the PropagationLossModel is a ns3::PathLossPropagationModel.

 */

class WifiChannel : public Channel

{

public:

  /**

   * arg1: the packet to receive

   * arg2: the rx power of the packet to receive (dbm)

   * arg3: the tx mode of the packet to receive

   * arg4: the preamble of the packet to receive

   */

  WifiChannel ();

  virtual ~WifiChannel ();

  /**

   * \returns the number of network interfaces connected to 

   *          this channel.

   *

   * Overriden from the NetDevice base class.

   */

  virtual uint32_t GetNDevices (void) const;

  /**

   * \param loss the new propagation loss model.

   */

  void SetPropationLossModel (Ptr<PropagationLossModel> loss);

  /**

   * \param delay the new propagation delay model.

   */

  void SetPropagationDelayModel (Ptr<PropagationDelayModel> delay);

  /**

   * \param device the device to add to the list of connected

   *        devices.

   * \param callback the callback to invoke when a packet must

   *        be received.

   *

   * This method should not be invoked by normal users. It is 

   * currently invoked only from WifiPhy::SetChannel.

   */

  void Add (Ptr<NetDevice> device,  ReceiveCallback callback);

  /**

   * \param sender the device from which the packet is originating.

   * \param packet the packet to send

   * \param txPowerDbm the tx power associated to the packet

   * \param wifiMode the tx mode associated to the packet

   * \param preamble the preamble associated to the packet

   *

   * This method should not be invoked by normal users. It is 

   * currently invoked only from WifiPhy::Send.

   */

             WifiMode wifiMode, WifiPreamble preamble) const;

private:

  typedef std::vector<std::pair<Ptr<NetDevice>, ReceiveCallback> > DeviceList;

                WifiMode txMode, WifiPreamble preamble) const;

  /**

   * \param i index of the requested network interface.

   * \returns the requested network interfaces connected to 

   *          this channel.

   *

   * Overriden from the NetDevice base class.

   * Indexes start at 0 and end at n-1.

   */

  virtual Ptr<NetDevice> DoGetDevice (uint32_t i) const ;

  DeviceList m_deviceList;

  Ptr<PropagationLossModel> m_loss;

  Ptr<PropagationDelayModel> m_delay;

};

} // namespace ns3

#endif /* WIFI_CHANNEL_H */