#ifndef __CONTEXT_CLIENT_HPP__
#define __CONTEXT_CLIENT_HPP__

#include "xios_spl.hpp"
#include "buffer_out.hpp"
#include "buffer_in.hpp"
#include "buffer_client.hpp"
#include "event_client.hpp"
#include "event_server.hpp"
#include "mpi.hpp"
#include "registry.hpp"

namespace xios
{
  class CContext;
  class CContextServer ;
  /*!
  \class CContextClient
  A context can be both on client and on server side. In order to differenciate the role of
  context on each side, e.x client sending events, server receiving and processing events, there is a need of
  concrete "context" classes for both sides.
  CContextClient processes and sends events from client to server where CContextServer receives these events
  and processes them.
  */
  class COneSidedContextClient ;

  class CContextClient
  {
    public:
      enum ETransport { generic, legacy, oneSided}  ;
      
      template<ETransport transport=generic> 
      static CContextClient* getNew(CContext* parent, MPI_Comm intraComm, MPI_Comm interComm, CContext* parentServer = 0) ;

            // Contructor
      CContextClient(CContext* parent, MPI_Comm intraComm, MPI_Comm interComm, CContext* parentServer = 0);

      bool isServerLeader(void) const;
      bool isServerNotLeader(void) const;
      const std::list<int>& getRanksServerLeader(void) const;
      const std::list<int>& getRanksServerNotLeader(void) const;
      bool isAttachedModeEnabled() const { return isAttached_ ; } 
      static void computeLeader(int clientRank, int clientSize, int serverSize,
                                std::list<int>& rankRecvLeader,
                                std::list<int>& rankRecvNotLeader);
      int getRemoteSize(void) {return serverSize;}
      int getServerSize(void) {return serverSize;}
      MPI_Comm getIntraComm(void)  {return intraComm ;} 
      int getIntraCommSize(void) {return clientSize ;}
      int getIntraCommRank(void) {return clientRank ;}
      /*! set the associated server (dual chanel client/server) */      
      void setAssociatedServer(CContextServer* associatedServer) { associatedServer=associatedServer_;}
      /*! get the associated server (dual chanel client/server) */      
      CContextServer* getAssociatedServer(void) { return associatedServer_;}
      


      // Send event to server
      virtual void sendEvent(CEventClient& event)=0;
      virtual void eventLoop(void)=0 ;
      virtual void releaseBuffers(void)=0;
      virtual bool havePendingRequests(void)=0;


      virtual bool isNotifiedFinalized(void)=0 ;
      virtual void finalize(void)=0;

      virtual void setBufferSize(const std::map<int,StdSize>& mapSize)=0;


    protected:

      CContext* context_; //!< Context for client

      CContext* parentServer; //!< Context for server (Only used in attached mode)

      int clientRank; //!< Rank of current client

      int clientSize; //!< Size of client group

      int serverSize; //!< Size of server group

      MPI_Comm interComm; //!< Communicator of server group (interCommunicator)

      MPI_Comm intraComm; //!< Communicator of client group
     
      std::list<int> ranksServerLeader; //!< List of server ranks for which the client is leader

      std::list<int> ranksServerNotLeader; //!< List of server ranks for which the client is not leader

      size_t hashId_ ; //!< hash id on the context client that will be used for context server to identify the remote calling context client.

      bool isAttached_ ;
      CContextServer* associatedServer_ ; //!< The server associated to the pair client/server
  };

  template<>
  CContextClient* CContextClient::getNew<CContextClient::generic>(CContext* parent, MPI_Comm intraComm, MPI_Comm interComm, CContext* parentServer) ;
 
  template<>
  CContextClient* CContextClient::getNew<CContextClient::oneSided>(CContext* parent, MPI_Comm intraComm, MPI_Comm interComm, CContext* parentServer) ;

  template<>
  CContextClient* CContextClient::getNew<CContextClient::legacy>(CContext* parent, MPI_Comm intraComm, MPI_Comm interComm, CContext* parentServer) ;


}

#endif // __CONTEXT_CLIENT_HPP__