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

/*

 * Copyright (c) 2007 University of Washington

 *

 * 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: Craig Dowell <craigdo@ee.washington.edu>

 */

#ifndef POINT_TO_POINT_NET_DEVICE_H

#define POINT_TO_POINT_NET_DEVICE_H

#include <string.h>

#include "ns3/mac-address.h"

#include "ns3/node.h"

#include "ns3/net-device.h"

#include "ns3/callback.h"

#include "ns3/packet.h"

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

#include "ns3/nstime.h"

#include "ns3/data-rate.h"

namespace ns3 {

class PointToPointChannel;

class PointToPointNetDevice : public NetDevice {

public:

  enum TraceType {

    QUEUE,

    RX,

  };

  PointToPointNetDevice (Node* node);

  PointToPointNetDevice (const PointToPointNetDevice& nd);

  virtual ~PointToPointNetDevice();

  PointToPointNetDevice& operator= (PointToPointNetDevice nd);

  void SetDataRate(DataRate bps);

  void SetInterframeGap(Time t);

public:

  bool Attach(PointToPointChannel* ch);

  void AddQueue(Queue*);

  void Receive (Packet& p);

protected:

  Queue* GetQueue(void) const; 

private:

  virtual bool SendTo (Packet& p, const MacAddress& dest);

  bool TransmitStart (Packet &p);

  void TransmitCompleteEvent (void);

  void TransmitReadyEvent (void);

  virtual TraceResolver *DoCreateTraceResolver (TraceContext const &context);

  enum TxMachineState

    {

      READY,

      BUSY,

      GAP

    };

  TxMachineState m_txMachineState;

  DataRate       m_bps;

  Time           m_tInterframeGap;

  PointToPointChannel* m_channel;

  Queue* m_queue;

  CallbackTraceSource<Packet &> m_rxTrace;

};

}; // namespace ns3

#endif // POINT_TO_POINT_NET_DEVICE_H