/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2011-2012 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>
 */

// dumb-requester.cc

#include "dumb-requester.hpp"
#include "ns3/ptr.h"
#include "ns3/log.h"
#include "ns3/simulator.h"
#include "ns3/packet.h"
#include "ns3/random-variable.h"
#include "ns3/string.h"

#include "ns3/ndn-app-face.hpp"
#include "ns3/ndn-interest.hpp"
#include "ns3/ndn-data.hpp"

NS_LOG_COMPONENT_DEFINE("DumbRequester");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED(DumbRequester);

// register NS-3 type
TypeId
DumbRequester::GetTypeId()
{
  static TypeId tid =
    TypeId("DumbRequester")
      .SetParent<ndn::App>()
      .AddConstructor<DumbRequester>()

      .AddAttribute("Prefix", "Requested name", StringValue("/dumb-interest"),
                    ndn::MakeNameAccessor(&DumbRequester::m_name), ndn::MakeNameChecker());
  return tid;
}

DumbRequester::DumbRequester()
  : m_isRunning(false)
{
}

// Processing upon start of the application
void
DumbRequester::StartApplication()
{
  // initialize ndn::App
  ndn::App::StartApplication();

  m_isRunning = true;
  Simulator::ScheduleNow(&DumbRequester::SendInterest, this);
}

// Processing when application is stopped
void
DumbRequester::StopApplication()
{
  m_isRunning = false;
  // cleanup ndn::App
  ndn::App::StopApplication();
}

void
DumbRequester::SendInterest()
{
  if (!m_isRunning)
    return;

  /////////////////////////////////////
  // Sending one Interest packet out //
  /////////////////////////////////////

  Ptr<ndn::Name> prefix = Create<ndn::Name>(m_name); // another way to create name

  // Create and configure ndn::Interest
  Ptr<ndn::Interest> interest = Create<ndn::Interest>();
  UniformVariable rand(0, std::numeric_limits<uint32_t>::max());
  interest->SetNonce(rand.GetValue());
  interest->SetName(prefix);
  interest->SetInterestLifetime(Seconds(1.0));

  NS_LOG_DEBUG("Sending Interest packet for " << *prefix);

  // Call trace (for logging purposes)
  m_transmittedInterests(interest, this, m_face);

  // Forward packet to lower (network) layer
  m_face->ReceiveInterest(interest);

  Simulator::Schedule(Seconds(1.0), &DumbRequester::SendInterest, this);
}

void
DumbRequester::OnData(Ptr<const ndn::Data> contentObject)
{
  NS_LOG_DEBUG("Receiving Data packet for " << contentObject->GetName());
}

} // namespace ns3