/*
 * Copyright (c) 2011 Bucknell University
 *
 * 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
 *
 * Authors: L. Felipe Perrone (perrone@bucknell.edu)
 *          Tiago G. Rodrigues (tgr002@bucknell.edu)
 *
 * Modified by: Mitch Watrous (watrous@u.washington.edu)
 */

#include "ns3/application-packet-probe.h"

#include "ns3/config.h"
#include "ns3/log.h"
#include "ns3/names.h"
#include "ns3/object.h"
#include "ns3/trace-source-accessor.h"

namespace ns3
{

NS_LOG_COMPONENT_DEFINE("ApplicationPacketProbe");

NS_OBJECT_ENSURE_REGISTERED(ApplicationPacketProbe);

TypeId
ApplicationPacketProbe::GetTypeId()
{
    static TypeId tid =
        TypeId("ns3::ApplicationPacketProbe")
            .SetParent<Probe>()
            .SetGroupName("Applications")
            .AddConstructor<ApplicationPacketProbe>()
            .AddTraceSource("Output",
                            "The packet plus its socket address that serve "
                            "as the output for this probe",
                            MakeTraceSourceAccessor(&ApplicationPacketProbe::m_output),
                            "ns3::Packet::AddressTracedCallback")
            .AddTraceSource("OutputBytes",
                            "The number of bytes in the packet",
                            MakeTraceSourceAccessor(&ApplicationPacketProbe::m_outputBytes),
                            "ns3::Packet::SizeTracedCallback");
    return tid;
}

ApplicationPacketProbe::ApplicationPacketProbe()
{
    NS_LOG_FUNCTION(this);
    m_packet = nullptr;
}

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

void
ApplicationPacketProbe::SetValue(Ptr<const Packet> packet, const Address& address)
{
    NS_LOG_FUNCTION(this << packet << address);
    m_packet = packet;
    m_address = address;
    m_output(packet, address);

    uint32_t packetSizeNew = packet->GetSize();
    m_outputBytes(m_packetSizeOld, packetSizeNew);
    m_packetSizeOld = packetSizeNew;
}

void
ApplicationPacketProbe::SetValueByPath(std::string path,
                                       Ptr<const Packet> packet,
                                       const Address& address)
{
    NS_LOG_FUNCTION(path << packet << address);
    Ptr<ApplicationPacketProbe> probe = Names::Find<ApplicationPacketProbe>(path);
    NS_ASSERT_MSG(probe, "Error:  Can't find probe for path " << path);
    probe->SetValue(packet, address);
}

bool
ApplicationPacketProbe::ConnectByObject(std::string traceSource, Ptr<Object> obj)
{
    NS_LOG_FUNCTION(this << traceSource << obj);
    NS_LOG_DEBUG("Name of probe (if any) in names database: " << Names::FindPath(obj));
    bool connected = obj->TraceConnectWithoutContext(
        traceSource,
        MakeCallback(&ns3::ApplicationPacketProbe::TraceSink, this));
    return connected;
}

void
ApplicationPacketProbe::ConnectByPath(std::string path)
{
    NS_LOG_FUNCTION(this << path);
    NS_LOG_DEBUG("Name of probe to search for in config database: " << path);
    Config::ConnectWithoutContext(path,
                                  MakeCallback(&ns3::ApplicationPacketProbe::TraceSink, this));
}

void
ApplicationPacketProbe::TraceSink(Ptr<const Packet> packet, const Address& address)
{
    NS_LOG_FUNCTION(this << packet << address);
    if (IsEnabled())
    {
        m_packet = packet;
        m_address = address;
        m_output(packet, address);

        uint32_t packetSizeNew = packet->GetSize();
        m_outputBytes(m_packetSizeOld, packetSizeNew);
        m_packetSizeOld = packetSizeNew;
    }
}

} // namespace ns3
