/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013 University of California, Los Angeles
 *                    Alexander Afanasyev
 *
 * 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>
 */

#ifndef NDN_IP_FACE_STACK_H
#define NDN_IP_FACE_STACK_H

#include "ns3/ndnSIM/model/ndn-common.hpp"

#include "ns3/application.h"
#include "ns3/socket.h"
#include "ns3/inet-socket-address.h"
#include "ns3/ptr.h"

#include <map>

namespace ns3 {

class Packet;

namespace ndn {

class Face;
class TcpFace;
class UdpFace;

/**
 * @ingroup ndn
 * @brief Application that provides functionality of creating IP-based faces on NDN nodes
 *
 * The class implements virtual calls onInterest, onNack, and onData
 */
class IpFaceStack : public Object {
public:
  static TypeId
  GetTypeId();

  /**
   * @brief Default constructor
   */
  IpFaceStack();
  virtual ~IpFaceStack();

  /**
   * @brief Lookup TcpFace for a given address
   */
  Ptr<TcpFace>
  GetTcpFaceByAddress(const Ipv4Address& addr);

  /**
   * @brief Destroy TcpFace, e.g., after TCP connection got dropped
   */
  void
  DestroyTcpFace(Ptr<TcpFace> face);

  /**
   * @brief Lookup UdpFace for a given address
   */
  Ptr<UdpFace>
  GetUdpFaceByAddress(const Ipv4Address& addr);

  /**
   * @brief Method allowing creation and lookup of faces
   *
   * All created UDP faces are stored internally in the map, and if the same face is created, it
   *will simply be looked up
   */
  Ptr<TcpFace>
  CreateOrGetTcpFace(Ipv4Address address,
                     Callback<void, Ptr<Face>> onCreate = NULL_CREATE_CALLBACK);

  /**
   * @brief Method allowing creation and lookup of faces
   *
   * All created TCP faces are stored internally in the map, and if the same face is created, it
   *will simply be looked up
   */
  Ptr<UdpFace>
  CreateOrGetUdpFace(Ipv4Address address);

protected:
  void
  NotifyNewAggregate();

private:
  void
  StartServer();

  bool
  OnTcpConnectionRequest(Ptr<Socket> sock, const Address& addr);

  void
  OnTcpConnectionAccept(Ptr<Socket> sock, const Address& addr);

  void
  OnTcpConnectionClosed(Ptr<Socket> sock);

  void
  OnUdpPacket(Ptr<Socket> sock);

public:
  const static Callback<void, Ptr<Face>> NULL_CREATE_CALLBACK;

protected:
  Ptr<Node> m_node;

  bool m_enableTcp;
  bool m_enableUdp;

  Ptr<Socket> m_tcpServer;
  Ptr<Socket> m_udpServer;

  typedef std::map<Ipv4Address, Ptr<TcpFace>> TcpFaceMap;
  typedef std::map<Ipv4Address, Ptr<UdpFace>> UdpFaceMap;
  TcpFaceMap m_tcpFaceMap;
  UdpFaceMap m_udpFaceMap;
};

} // namespace ndn
} // namespace ns3

#endif // NDN_IP_FACE_STACK_H