/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * 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

 */

#ifndef NSC_TCP_SOCKET_IMPL_H

#define NSC_TCP_SOCKET_IMPL_H

#include <stdint.h>

#include <queue>

#include <vector>

#include "ns3/callback.h"

#include "ns3/traced-value.h"

#include "ns3/tcp-socket.h"

#include "ns3/ptr.h"

#include "ns3/ipv4-address.h"

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

#include "ns3/event-id.h"

#include "tcp-typedefs.h"

#include "pending-data.h"

#include "ns3/sequence-number.h"

struct INetStreamSocket;

namespace ns3 {

class Ipv4EndPoint;

class Node;

class Packet;

class NscTcpL4Protocol;

class TcpHeader;

/**

 * \ingroup socket

 * \ingroup nsctcp

 *

 * \brief Socket logic for the NSC TCP sockets.  

 * 

 * Most of the TCP internal

 * logic is handled by the NSC tcp library itself; this class maps ns3::Socket

 * calls to the NSC TCP library.

 */

class NscTcpSocketImpl : public TcpSocket

{

public:

  static TypeId GetTypeId (void);

  /**

   * Create an unbound tcp socket.

   */

  NscTcpSocketImpl ();

  NscTcpSocketImpl (const NscTcpSocketImpl& sock);

  virtual ~NscTcpSocketImpl ();

  void SetNode (Ptr<Node> node);

  void SetTcp (Ptr<NscTcpL4Protocol> tcp);

  virtual enum SocketErrno GetErrno (void) const;

  virtual Ptr<Node> GetNode (void) const;

  virtual int Bind (void);

  virtual int Bind (const Address &address);

  virtual int Close (void);

  virtual int ShutdownSend (void);

  virtual int ShutdownRecv (void);

  virtual int Connect(const Address &address);

  virtual int Listen(void);

  virtual uint32_t GetTxAvailable (void) const;

  virtual int Send (Ptr<Packet> p, uint32_t flags);

  virtual int SendTo(Ptr<Packet> p, uint32_t flags, const Address &toAddress);

  virtual uint32_t GetRxAvailable (void) const;

  virtual Ptr<Packet> Recv (uint32_t maxSize, uint32_t flags);

  virtual Ptr<Packet> RecvFrom (uint32_t maxSize, uint32_t flags,

    Address &fromAddress);

  virtual int GetSockName (Address &address) const; 

private:

  void NSCWakeup(void);

  friend class Tcp;

  // invoked by Tcp class

  int FinishBind (void);

  void ForwardUp (Ptr<Packet> p, Ipv4Address saddr, Ipv4Address daddr, uint16_t port);

  void Destroy (void);

  //methods for state

  bool SendPendingData(void);

  bool ReadPendingData(void);

  bool Accept(void);

  void CompleteFork(void);

  void ConnectionSucceeded();

  // Manage data tx/rx

  // XXX This should be virtual and overridden

  Ptr<NscTcpSocketImpl> Copy ();

  // attribute related

  virtual void SetSndBufSize (uint32_t size);

  virtual uint32_t GetSndBufSize (void) const;

  virtual void SetRcvBufSize (uint32_t size);

  virtual uint32_t GetRcvBufSize (void) const;

  virtual void SetSegSize (uint32_t size);

  virtual uint32_t GetSegSize (void) const;

  virtual void SetAdvWin (uint32_t window);

  virtual uint32_t GetAdvWin (void) const;

  virtual void SetSSThresh (uint32_t threshold);

  virtual uint32_t GetSSThresh (void) const;

  virtual void SetInitialCwnd (uint32_t cwnd);

  virtual uint32_t GetInitialCwnd (void) const;

  virtual void SetConnTimeout (Time timeout);

  virtual Time GetConnTimeout (void) const;

  virtual void SetConnCount (uint32_t count);

  virtual uint32_t GetConnCount (void) const;

  virtual void SetDelAckTimeout (Time timeout);

  virtual Time GetDelAckTimeout (void) const;

  virtual void SetDelAckMaxCount (uint32_t count);

  virtual uint32_t GetDelAckMaxCount (void) const;

  enum Socket::SocketErrno GetNativeNs3Errno(int err) const;

  uint32_t m_delAckMaxCount;

  Time m_delAckTimeout;

  Ipv4EndPoint *m_endPoint;

  Ptr<Node> m_node;

  Ptr<NscTcpL4Protocol> m_tcp;

  Ipv4Address m_remoteAddress;

  uint16_t m_remotePort;

  //these two are so that the socket/endpoint cloning works

  Ipv4Address m_localAddress;

  uint16_t m_localPort;

  InetSocketAddress m_peerAddress;

  enum SocketErrno m_errno;

  bool m_shutdownSend;

  bool m_shutdownRecv;

  bool m_connected;

  //manage the state information

  States_t m_state;

  bool m_closeOnEmpty;

  //needed to queue data when in SYN_SENT state

  std::queue<Ptr<Packet> > m_txBuffer;

  uint32_t m_txBufferSize;

  // Window management

  uint32_t                       m_segmentSize;          //SegmentSize

  uint32_t                       m_rxWindowSize;

  uint32_t                       m_advertisedWindowSize; //Window to advertise

  TracedValue<uint32_t>          m_cWnd;                 //Congestion window

  uint32_t                       m_ssThresh;             //Slow Start Threshold

  uint32_t                       m_initialCWnd;          //Initial cWnd value

  // Round trip time estimation

  Time m_lastMeasuredRtt;

  // Timer-related members

  Time              m_cnTimeout; 

  uint32_t          m_cnCount;

  // Temporary queue for delivering data to application

  std::queue<Ptr<Packet> > m_deliveryQueue;

  uint32_t m_rxAvailable;

  INetStreamSocket* m_nscTcpSocket;

  // Attributes

  uint32_t m_sndBufSize;   // buffer limit for the outgoing queue

  uint32_t m_rcvBufSize;   // maximum receive socket buffer size

};

}//namespace ns3

#endif /* NSC_TCP_SOCKET_IMPL_H */