/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014 Universita' di Firenze
 *
 * 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: Tommaso Pecorella <tommaso.pecorella@unifi.it>
 */

#include "ns3/log.h"
#include "ns3/nstime.h"
#include "ns3/packet-socket-address.h"
#include "ns3/packet-socket.h"
#include "ns3/packet-socket-factory.h"
#include "ns3/socket.h"
#include "ns3/simulator.h"
#include "ns3/socket-factory.h"
#include "ns3/packet.h"
#include "ns3/uinteger.h"
#include "ns3/abort.h"
#include "packet-socket-server.h"
#include <cstdlib>
#include <cstdio>

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("PacketSocketServer");

NS_OBJECT_ENSURE_REGISTERED (PacketSocketServer);

TypeId
PacketSocketServer::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::PacketSocketServer")
    .SetParent<Application> ()
    .SetGroupName("Network")
    .AddConstructor<PacketSocketServer> ()
    .AddTraceSource ("Rx", "A packet has been received",
                     MakeTraceSourceAccessor (&PacketSocketServer::m_rxTrace),
                     "ns3::Packet::AddressTracedCallback")
  ;
  return tid;
}

PacketSocketServer::PacketSocketServer ()
{
  NS_LOG_FUNCTION (this);
  m_pktRx = 0;
  m_bytesRx = 0;
  m_socket = 0;
  m_localAddressSet = false;
}

PacketSocketServer::~PacketSocketServer ()
{
  NS_LOG_FUNCTION (this);
}

void
PacketSocketServer::DoDispose (void)
{
  NS_LOG_FUNCTION (this);
  Application::DoDispose ();
}

void
PacketSocketServer::StartApplication (void)
{
  NS_LOG_FUNCTION (this);
  NS_ASSERT_MSG (m_localAddressSet, "Local address not set");

  if (m_socket == 0)
    {
      TypeId tid = TypeId::LookupByName ("ns3::PacketSocketFactory");
      m_socket = Socket::CreateSocket (GetNode (), tid);
      m_socket->Bind (m_localAddress);
    }

  m_socket->SetRecvCallback (MakeCallback (&PacketSocketServer::HandleRead, this));
}

void
PacketSocketServer::StopApplication (void)
{
  NS_LOG_FUNCTION (this);
  m_socket->SetRecvCallback (MakeNullCallback<void, Ptr<Socket> > ());
  m_socket->Close ();
}

void
PacketSocketServer::SetLocal (PacketSocketAddress addr)
{
  NS_LOG_FUNCTION (this << addr);
  m_localAddress = addr;
  m_localAddressSet = true;
}

void
PacketSocketServer::HandleRead (Ptr<Socket> socket)
{
  NS_LOG_FUNCTION (this << socket);
  Ptr<Packet> packet;
  Address from;
  while ((packet = socket->RecvFrom (from)))
    {
      if (PacketSocketAddress::IsMatchingType (from))
        {
          m_pktRx ++;
          m_bytesRx += packet->GetSize ();
          NS_LOG_INFO ("At time " << Simulator::Now ().GetSeconds ()
                       << "s packet sink received "
                       << packet->GetSize () << " bytes from "
                       << PacketSocketAddress::ConvertFrom (from)
                       << " total Rx " << m_pktRx << " packets"
                       << " and " << m_bytesRx << " bytes");
          m_rxTrace (packet, from);
        }
    }
}

} // Namespace ns3