/* -*- 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 YANS_WIFI_CHANNEL_H

#define YANS_WIFI_CHANNEL_H

#include <vector>

#include <stdint.h>

#include "ns3/packet.h"

#include "wifi-channel.h"

#include "wifi-mode.h"

#include "wifi-preamble.h"

namespace ns3 {

class NetDevice;

class PropagationLossModel;

class PropagationDelayModel;

class YansWifiPhy;

/**

 * \brief A Yans wifi channel

 * \ingroup wifi

 *

 * This wifi channel implements the propagation model described in

 * "Yet Another Network Simulator", (http://cutebugs.net/files/wns2-yans.pdf).

 *

 * This class is expected to be used in tandem with the ns3::YansWifiPhy

 * class and contains a ns3::PropagationLossModel and a ns3::PropagationDelayModel.

 * By default, no propagation models are set so, it is the caller's responsability

 * to set them before using the channel.

 */

class YansWifiChannel : public WifiChannel

{

public:

  static TypeId GetTypeId (void);

  YansWifiChannel ();

  virtual ~YansWifiChannel ();

  // inherited from Channel.

  virtual uint32_t GetNDevices (void) const;

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

  void Add (Ptr<YansWifiPhy> phy);

  /**

   * \param loss the new propagation loss model.

   */

  void SetPropagationLossModel (Ptr<PropagationLossModel> loss);

  /**

   * \param delay the new propagation delay model.

   */

  void SetPropagationDelayModel (Ptr<PropagationDelayModel> delay);

  /**

   * \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. YansWifiChannel

   * delivers packets only between PHYs with the same m_channelNumber,

   * e.g. PHYs that are operating on the same channel.

   */

  void Send (Ptr<YansWifiPhy> sender, Ptr<const Packet> packet, double txPowerDbm,

 /**

  * Assign a fixed random variable stream number to the random variables

  * used by this model.  Return the number of streams (possibly zero) that

  * have been assigned.

  *

  * \param stream first stream index to use

  * \return the number of stream indices assigned by this model

  */

  int64_t AssignStreams (int64_t stream);

private:

  YansWifiChannel& operator = (const YansWifiChannel &);

  YansWifiChannel (const YansWifiChannel &);

  typedef std::vector<Ptr<YansWifiPhy> > PhyList;

  void Receive (uint32_t i, Ptr<Packet> packet, double rxPowerDbm,

  PhyList m_phyList;

  Ptr<PropagationLossModel> m_loss;

  Ptr<PropagationDelayModel> m_delay;

};

} // namespace ns3

#endif /* YANS_WIFI_CHANNEL_H */