/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013 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>
 *       : Saran Tarnoi <saran.tarnoi@gmail.com>
 */

#include "ndn-link-control-helper.hpp"

#include "ns3/assert.h"
#include "ns3/names.h"
#include "ns3/point-to-point-net-device.h"
#include "ns3/point-to-point-channel.h"
#include "ns3/channel.h"
#include "ns3/log.h"

#include "ns3/ndn-l3-protocol.hpp"
#include "ns3/ndn-net-device-face.hpp"

NS_LOG_COMPONENT_DEFINE("ndn.LinkControlHelper");

namespace ns3 {
namespace ndn {

void
LinkControlHelper::FailLink(Ptr<Node> node1, Ptr<Node> node2)
{
  NS_LOG_FUNCTION(node1 << node2);

  NS_ASSERT(node1 != 0);
  NS_ASSERT(node2 != 0);

  Ptr<ndn::L3Protocol> ndn1 = node1->GetObject<ndn::L3Protocol>();
  Ptr<ndn::L3Protocol> ndn2 = node2->GetObject<ndn::L3Protocol>();

  NS_ASSERT(ndn1 != 0);
  NS_ASSERT(ndn2 != 0);

  // iterate over all faces to find the right one
  for (uint32_t faceId = 0; faceId < ndn1->GetNFaces(); faceId++) {
    Ptr<ndn::NetDeviceFace> ndFace = ndn1->GetFace(faceId)->GetObject<ndn::NetDeviceFace>();
    if (ndFace == 0)
      continue;

    Ptr<PointToPointNetDevice> nd1 = ndFace->GetNetDevice()->GetObject<PointToPointNetDevice>();
    if (nd1 == 0)
      continue;

    Ptr<Channel> channel = nd1->GetChannel();
    if (channel == 0)
      continue;

    Ptr<PointToPointChannel> ppChannel = DynamicCast<PointToPointChannel>(channel);

    Ptr<NetDevice> nd2 = ppChannel->GetDevice(0);
    if (nd2->GetNode() == node1)
      nd2 = ppChannel->GetDevice(1);

    if (nd2->GetNode() == node2) {
      Ptr<ndn::Face> face1 = ndn1->GetFaceByNetDevice(nd1);
      Ptr<ndn::Face> face2 = ndn2->GetFaceByNetDevice(nd2);

      face1->SetUp(false);
      face2->SetUp(false);
      break;
    }
  }
}
void
LinkControlHelper::FailLinkByName(const std::string& node1, const std::string& node2)
{
  FailLink(Names::Find<Node>(node1), Names::Find<Node>(node2));
}

void
LinkControlHelper::UpLink(Ptr<Node> node1, Ptr<Node> node2)
{
  NS_LOG_FUNCTION(node1 << node2);

  NS_ASSERT(node1 != 0);
  NS_ASSERT(node2 != 0);

  Ptr<ndn::L3Protocol> ndn1 = node1->GetObject<ndn::L3Protocol>();
  Ptr<ndn::L3Protocol> ndn2 = node2->GetObject<ndn::L3Protocol>();

  NS_ASSERT(ndn1 != 0);
  NS_ASSERT(ndn2 != 0);

  // iterate over all faces to find the right one
  for (uint32_t faceId = 0; faceId < ndn1->GetNFaces(); faceId++) {
    Ptr<ndn::NetDeviceFace> ndFace = ndn1->GetFace(faceId)->GetObject<ndn::NetDeviceFace>();
    if (ndFace == 0)
      continue;

    Ptr<PointToPointNetDevice> nd1 = ndFace->GetNetDevice()->GetObject<PointToPointNetDevice>();
    if (nd1 == 0)
      continue;

    Ptr<Channel> channel = nd1->GetChannel();
    if (channel == 0)
      continue;

    Ptr<PointToPointChannel> ppChannel = DynamicCast<PointToPointChannel>(channel);

    Ptr<NetDevice> nd2 = ppChannel->GetDevice(0);
    if (nd2->GetNode() == node1)
      nd2 = ppChannel->GetDevice(1);

    if (nd2->GetNode() == node2) {
      Ptr<ndn::Face> face1 = ndn1->GetFaceByNetDevice(nd1);
      Ptr<ndn::Face> face2 = ndn2->GetFaceByNetDevice(nd2);

      face1->SetUp(true);
      face2->SetUp(true);
      break;
    }
  }
}

void
LinkControlHelper::UpLinkByName(const std::string& node1, const std::string& node2)
{
  UpLink(Names::Find<Node>(node1), Names::Find<Node>(node2));
}
}
}