/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2014,  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/>.
 */

#ifndef NFD_DAEMON_MGMT_FACE_MANAGER_HPP
#define NFD_DAEMON_MGMT_FACE_MANAGER_HPP

#include "common.hpp"
#include "core/notification-stream.hpp"
#include "face/local-face.hpp"
#include "mgmt/manager-base.hpp"
#include "mgmt/face-status-publisher.hpp"
#include "mgmt/channel-status-publisher.hpp"
#include "mgmt/face-query-status-publisher.hpp"

#include <ndn-cxx/management/nfd-control-parameters.hpp>
#include <ndn-cxx/management/nfd-control-response.hpp>

namespace nfd {

const std::string FACE_MANAGER_PRIVILEGE = "faces";

class ConfigFile;
class Face;
class FaceTable;
class LocalFace;
class NetworkInterfaceInfo;
class ProtocolFactory;

class FaceManager : public ManagerBase
{
public:
  class Error : public ManagerBase::Error
  {
  public:
    Error(const std::string& what) : ManagerBase::Error(what) {}
  };

  /**
   * \throws FaceManager::Error if localPort is an invalid port number
   */
  FaceManager(FaceTable& faceTable,
              shared_ptr<InternalFace> face,
              ndn::KeyChain& keyChain);

  virtual
  ~FaceManager();

  /** \brief Subscribe to a face management section(s) for the config file
   */
  void
  setConfigFile(ConfigFile& configFile);

  void
  onFaceRequest(const Interest& request);

PUBLIC_WITH_TESTS_ELSE_PRIVATE:
  void
  listFaces(const Interest& request);

  void
  listChannels(const Interest& request);

  void
  listQueriedFaces(const Interest& request);

  shared_ptr<ProtocolFactory>
  findFactory(const std::string& protocol);

PROTECTED_WITH_TESTS_ELSE_PRIVATE:
  void
  onValidatedFaceRequest(const shared_ptr<const Interest>& request);

  VIRTUAL_WITH_TESTS void
  createFace(const Interest& request,
             ControlParameters& parameters);

  VIRTUAL_WITH_TESTS void
  destroyFace(const Interest& request,
              ControlParameters& parameters);

  VIRTUAL_WITH_TESTS bool
  extractLocalControlParameters(const Interest& request,
                                ControlParameters& parameters,
                                ControlCommand& command,
                                shared_ptr<LocalFace>& outFace,
                                LocalControlFeature& outFeature);

  VIRTUAL_WITH_TESTS void
  enableLocalControl(const Interest& request,
                     ControlParameters& parambeters);

  VIRTUAL_WITH_TESTS void
  disableLocalControl(const Interest& request,
                      ControlParameters& parameters);

  void
  ignoreUnsignedVerb(const Interest& request);

  void
  addCreatedFaceToForwarder(const shared_ptr<Face>& newFace);

  void
  onCreated(const Name& requestName,
            ControlParameters& parameters,
            const shared_ptr<Face>& newFace);

  void
  onConnectFailed(const Name& requestName, const std::string& reason);

  void
  onAddFace(shared_ptr<Face> face);

  void
  onRemoveFace(shared_ptr<Face> face);

private:
  void
  onConfig(const ConfigSection& configSection, bool isDryRun, const std::string& filename);

  /** \brief parse a config option that can be either "yes" or "no"
   *  \throw ConfigFile::Error value is neither "yes" nor "no"
   *  \return true if "yes", false if "no"
   */
  bool
  parseYesNo(const ConfigSection::const_iterator& i,
             const std::string& optionName,
             const std::string& sectionName);

PUBLIC_WITH_TESTS_ELSE_PRIVATE:
  typedef std::map<std::string/*protocol*/, shared_ptr<ProtocolFactory>> FactoryMap;
  FactoryMap m_factories;

private:
  FaceTable& m_faceTable;
  signal::ScopedConnection m_faceAddConn;
  signal::ScopedConnection m_faceRemoveConn;
  FaceStatusPublisher m_faceStatusPublisher;
  ChannelStatusPublisher m_channelStatusPublisher;
  NotificationStream<AppFace> m_notificationStream;

  typedef function<void(FaceManager*,
                        const Interest&,
                        ControlParameters&)> SignedVerbProcessor;

  typedef std::map<Name::Component, SignedVerbProcessor> SignedVerbDispatchTable;
  typedef std::pair<Name::Component, SignedVerbProcessor> SignedVerbAndProcessor;

  typedef function<void(FaceManager*, const Interest&)> UnsignedVerbProcessor;

  typedef std::map<Name::Component, UnsignedVerbProcessor> UnsignedVerbDispatchTable;
  typedef std::pair<Name::Component, UnsignedVerbProcessor> UnsignedVerbAndProcessor;

  const SignedVerbDispatchTable m_signedVerbDispatch;
  const UnsignedVerbDispatchTable m_unsignedVerbDispatch;

  static const Name COMMAND_PREFIX; // /localhost/nfd/faces

  // number of components in an invalid signed command (i.e. should be signed, but isn't)
  // (/localhost/nfd/faces + verb + parameters) = 5
  static const size_t COMMAND_UNSIGNED_NCOMPS;

  // number of components in a valid signed command.
  // (see UNSIGNED_NCOMPS), 9 with signed Interest support.
  static const size_t COMMAND_SIGNED_NCOMPS;

  static const SignedVerbAndProcessor SIGNED_COMMAND_VERBS[];
  static const UnsignedVerbAndProcessor UNSIGNED_COMMAND_VERBS[];

  static const Name FACES_LIST_DATASET_PREFIX;
  static const size_t FACES_LIST_DATASET_NCOMPS;

  static const Name CHANNELS_LIST_DATASET_PREFIX;
  static const size_t CHANNELS_LIST_DATASET_NCOMPS;

  static const Name FACES_QUERY_DATASET_PREFIX;
  static const size_t FACES_QUERY_DATASET_NCOMPS;

  static const Name FACE_EVENTS_PREFIX;
};

inline bool
FaceManager::parseYesNo(const ConfigSection::const_iterator& i,
                        const std::string& optionName,
                        const std::string& sectionName)
{
  const std::string value = i->second.get_value<std::string>();
  if (value == "yes")
    {
      return true;
    }
  else if (value == "no")
    {
      return false;
    }

  throw ConfigFile::Error("Invalid value for option \"" +
                          optionName + "\" in \"" +
                          sectionName + "\" section");
}

inline void
FaceManager::ignoreUnsignedVerb(const Interest& request)
{
  // do nothing
}

} // namespace nfd

#endif // NFD_DAEMON_MGMT_FACE_MANAGER_HPP