/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2011 University of California, Los Angeles
 *
 * 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 *
 */

#include "ndn-net-device-face.hpp"
#include "ndn-l3-protocol.hpp"

#include "ndn-ns3.hpp"

#include "ns3/net-device.h"
#include "ns3/log.h"
#include "ns3/packet.h"
#include "ns3/node.h"
#include "ns3/pointer.h"

// #include "ns3/address.h"
#include "ns3/point-to-point-net-device.h"
#include "ns3/channel.h"

#include "../utils/ndn-fw-hop-count-tag.hpp"

NS_LOG_COMPONENT_DEFINE("ndn.NetDeviceFace");

namespace ns3 {
namespace ndn {

NetDeviceFace::NetDeviceFace(Ptr<Node> node, const Ptr<NetDevice>& netDevice)
  : Face(FaceUri("netDeviceFace://"), FaceUri("netDeviceFace://"))
  , m_node(node)
  , m_netDevice(netDevice)
{
  NS_LOG_FUNCTION(this << netDevice);

  setMetric(1); // default metric

  NS_ASSERT_MSG(m_netDevice != 0, "NetDeviceFace needs to be assigned a valid NetDevice");

  m_node->RegisterProtocolHandler(MakeCallback(&NetDeviceFace::receiveFromNetDevice, this),
                                  L3Protocol::ETHERNET_FRAME_TYPE, m_netDevice,
                                  true /*promiscuous mode*/);
}

NetDeviceFace::~NetDeviceFace()
{
  NS_LOG_FUNCTION_NOARGS();

  m_node->UnregisterProtocolHandler(MakeCallback(&NetDeviceFace::receiveFromNetDevice, this));
}

void
NetDeviceFace::close()
{
}

Ptr<NetDevice>
NetDeviceFace::GetNetDevice() const
{
  return m_netDevice;
}

void
NetDeviceFace::send(Ptr<Packet> packet)
{
  NS_ASSERT_MSG(packet->GetSize() <= m_netDevice->GetMtu(),
                "Packet size " << packet->GetSize() << " exceeds device MTU "
                               << m_netDevice->GetMtu());

  FwHopCountTag tag;
  packet->RemovePacketTag(tag);
  tag.Increment();
  packet->AddPacketTag(tag);

  m_netDevice->Send(packet, m_netDevice->GetBroadcast(), L3Protocol::ETHERNET_FRAME_TYPE);
}

void
NetDeviceFace::sendInterest(const Interest& interest)
{
  NS_LOG_FUNCTION(this << &interest);

  this->onSendInterest(interest);

  Ptr<Packet> packet = Convert::ToPacket(interest);
  send(packet);
}

void
NetDeviceFace::sendData(const Data& data)
{
  NS_LOG_FUNCTION(this << &data);

  this->onSendData(data);

  Ptr<Packet> packet = Convert::ToPacket(data);
  send(packet);
}

// callback
void
NetDeviceFace::receiveFromNetDevice(Ptr<NetDevice> device, Ptr<const Packet> p, uint16_t protocol,
                                    const Address& from, const Address& to,
                                    NetDevice::PacketType packetType)
{
  NS_LOG_FUNCTION(device << p << protocol << from << to << packetType);

  Ptr<Packet> packet = p->Copy();
  try {
    uint32_t type = Convert::getPacketType(p);
    if (type == ::ndn::tlv::Interest) {
      shared_ptr<const Interest> i = Convert::FromPacket<Interest>(packet);
      this->onReceiveInterest(*i);
    }
    else if (type == ::ndn::tlv::Data) {
      shared_ptr<const Data> d = Convert::FromPacket<Data>(packet);
      this->onReceiveData(*d);
    }
    else {
      NS_LOG_ERROR("Unsupported TLV packet");
    }
  }
  catch (::ndn::tlv::Error&) {
    NS_LOG_ERROR("Unrecognized TLV packet");
  }
}

} // namespace ndn
} // namespace ns3