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

/*

 * Copyright (c) 2005,2006 INRIA

 * All rights reserved.

 *

 * 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>

 */

#include <iostream>

#include <cassert>

#include "ns3/debug.h"

#include "protocol.h"

#include "demux.h"

#include "queue.h"

#include "serial-net-device.h"

#include "serial-channel.h"

namespace ns3 {

const int IPv4ProtocolNumber = 4;

namespace {

  int sndDebug = 0;

}

SerialNetDevice::SerialNetDevice(Node* node, const MacAddress& addr) : 

  NetDevice(node, addr)

{

  NS3_TRACE(sndDebug, 

    "SerialNetDevice::SerialNetDevice (" << node << ", " << &addr << ")")

  // BUGBUG FIXME

  //

  // You _must_ support broadcast to get any sort of packet from the ARP layer.

  EnableBroadcast (MacAddress ("ff:ff:ff:ff:ff:ff"));

  EnableMulticast();

  EnablePointToPoint();

  SetMtu(512); // bytes

}

SerialNetDevice::~SerialNetDevice()

{

  NS3_TRACE(sndDebug, 

    "SerialNetDevice::~SerialNetDevice ()")

}

  bool

SerialNetDevice::SendTo (Packet& p, const MacAddress& dest)

{

  NS3_TRACE(sndDebug, 

    "SerialNetDevice::SendTo (" << &p << ", " << &dest << ")")

  assert (IsLinkUp ());

#ifdef NOTYET

    struct NetDevicePacketDestAddress tag;

    tag.address = address;

    p.AddTag (tag);

#endif

    if (m_queue->Enque(p) )

      {

        NotifyDataAvailable ();

        return true;

      }

    return false;

}

  bool

SerialNetDevice::Attach (SerialChannel* ch)

{

  NS3_TRACE(sndDebug, 

    "SerialNetDevice::Attach (" << &ch << ")")

  m_channel = ch;

  /* 

   * For now, this device is up whenever a channel is attached to it.

   * In fact, it should become up only when the second device

   * is attached to the channel. So, there should be a way for

   * a SerialChannel to notify both of its attached devices

   * that the channel is 'complete', hence that the devices are

   * up, hence that they can call NotifyLinkUp. 

   */

  NotifyLinkUp ();

  return true;

}

void

SerialNetDevice::AddQueue (Queue* q)

{

  NS3_TRACE(sndDebug, 

    "SerialNetDevice::AddQueue (" << q << ")")

  m_queue = q;

}

void

SerialNetDevice::Receive (Packet& p)

{

  // ignore return value for now.

  NS3_TRACE(sndDebug, 

    "SerialNetDevice::Receive (" << &p << ")")

  ForwardUp (p);

}

void

SerialNetDevice::NotifyDataAvailable(void)

{

  NS3_TRACE(sndDebug, 

    "SerialNetDevice::NotifyDataAvailable ()")

  Packet p;

  bool found = GetQueue ()->Deque (p);

  if (found)

    {

#ifdef NOTYET

      struct NetDevicePacketDestAddress tag;

      p.PeekTag (tag);

      // send packet to address tag.address

#endif

      NS3_TRACE(sndDebug, 

        "SerialNetDevice::NotifyDataAvailable (): Dequeued")

      m_channel->Send(p, this);

    }

}

} // namespace ns3