/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2014-2015,  Regents of the University of California,
 *                           Arizona Board of Regents,
 *                           Colorado State University,
 *                           University Pierre & Marie Curie, Sorbonne University,
 *                           Washington University in St. Louis,
 *                           Beijing Institute of Technology,
 *                           The University of Memphis.
 *
 * This file is part of NFD (Named Data Networking Forwarding Daemon).
 * See AUTHORS.md for complete list of NFD authors and contributors.
 *
 * NFD is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * NFD 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
 * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "client-control-strategy.hpp"
#include "core/logger.hpp"

namespace nfd {
namespace fw {

NFD_LOG_INIT("ClientControlStrategy");

const Name
ClientControlStrategy::STRATEGY_NAME("ndn:/localhost/nfd/strategy/client-control/%FD%01");
NFD_REGISTER_STRATEGY(ClientControlStrategy);

ClientControlStrategy::ClientControlStrategy(Forwarder& forwarder, const Name& name)
  : BestRouteStrategy(forwarder, name)
{
}

ClientControlStrategy::~ClientControlStrategy()
{
}

void
ClientControlStrategy::afterReceiveInterest(const Face& inFace,
                                            const Interest& interest,
                                            shared_ptr<fib::Entry> fibEntry,
                                            shared_ptr<pit::Entry> pitEntry)
{
  // Strategy needn't check whether LocalControlHeader-NextHopFaceId is enabled.
  // LocalFace does this check.
  if (!interest.getLocalControlHeader().hasNextHopFaceId()) {
    this->BestRouteStrategy::afterReceiveInterest(inFace, interest, fibEntry, pitEntry);
    return;
  }

  FaceId outFaceId = static_cast<FaceId>(interest.getNextHopFaceId());
  shared_ptr<Face> outFace = this->getFace(outFaceId);
  if (!static_cast<bool>(outFace)) {
    // If outFace doesn't exist, it's better to reject the Interest
    // than to use BestRouteStrategy.
    NFD_LOG_WARN("Interest " << interest.getName() <<
                 " NextHopFaceId=" << outFaceId << " non-existent face");
    this->rejectPendingInterest(pitEntry);
    return;
  }

  this->sendInterest(pitEntry, outFace);
}

} // namespace fw
} // namespace nfd