/////////////////////////////////////////////////////////////////////////////
// Name:        ipcbase.h
// Purpose:     Base classes for IPC
// Author:      Julian Smart
// Modified by:
// Created:     4/1/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:   	wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_IPCBASEH__
#define _WX_IPCBASEH__

#ifdef __GNUG__
#pragma interface "ipcbase.h"
#endif

#include "wx/defs.h"
#include "wx/object.h"
#include "wx/string.h"

enum wxIPCFormat
{
  wxIPC_INVALID =          0,
  wxIPC_TEXT =             1,  /* CF_TEXT */
  wxIPC_BITMAP =           2,  /* CF_BITMAP */
  wxIPC_METAFILE =         3,  /* CF_METAFILEPICT */
  wxIPC_SYLK =             4,
  wxIPC_DIF =              5,
  wxIPC_TIFF =             6,
  wxIPC_OEMTEXT =          7,  /* CF_OEMTEXT */
  wxIPC_DIB =              8,  /* CF_DIB */
  wxIPC_PALETTE =          9,
  wxIPC_PENDATA =          10,
  wxIPC_RIFF =             11,
  wxIPC_WAVE =             12,
  wxIPC_UNICODETEXT =      13,
  wxIPC_ENHMETAFILE =      14,
  wxIPC_FILENAME =         15, /* CF_HDROP */
  wxIPC_LOCALE =           16,
  wxIPC_PRIVATE =          20
};

class WXDLLEXPORT wxDDEServerBase;
class WXDLLEXPORT wxDDEClientBase;

class WXDLLEXPORT wxConnectionBase: public wxObject
{
  DECLARE_CLASS(wxConnectionBase)
 public:
  inline wxConnectionBase(void) {}
  inline ~wxConnectionBase(void) {}

  // Calls that CLIENT can make
  virtual bool Execute(wxChar *data, int size = -1, wxIPCFormat format = wxIPC_TEXT ) = 0;
  virtual bool Execute(const wxString& str) { return Execute(WXSTRINGCAST str, -1, wxIPC_TEXT); }
  virtual char *Request(const wxString& item, int *size = (int *) NULL, wxIPCFormat format = wxIPC_TEXT) = 0;
  virtual bool Poke(const wxString& item, wxChar *data, int size = -1, wxIPCFormat format = wxIPC_TEXT) = 0;
  virtual bool StartAdvise(const wxString& item) = 0;
  virtual bool StopAdvise(const wxString& item) = 0;

  // Calls that SERVER can make
  virtual bool Advise(const wxString& item, wxChar *data, int size = -1, wxIPCFormat format = wxIPC_TEXT) = 0;

  // Calls that both can make
  virtual bool Disconnect(void) = 0;

  // Callbacks to SERVER - override at will
  virtual bool OnExecute( const wxString& WXUNUSED(topic), char *WXUNUSED(data), int WXUNUSED(size), 
                          int WXUNUSED(format) ) { return FALSE; };
  virtual char *OnRequest( const wxString& WXUNUSED(topic), const wxString& WXUNUSED(item), 
			     int *WXUNUSED(size), int WXUNUSED(format) ) { return (char *) NULL; };
  virtual bool OnPoke( const wxString& WXUNUSED(topic), const wxString& WXUNUSED(item), wxChar *WXUNUSED(data), 
		       int WXUNUSED(size), int WXUNUSED(format) ) { return FALSE; };
  virtual bool OnStartAdvise( const wxString& WXUNUSED(topic), const wxString& WXUNUSED(item) ) 
                              { return FALSE; };
  virtual bool OnStopAdvise( const wxString& WXUNUSED(topic), const wxString& WXUNUSED(item) ) 
                             { return FALSE; };

  // Callbacks to CLIENT - override at will
  virtual bool OnAdvise( const wxString& WXUNUSED(topic), const wxString& WXUNUSED(item), char *WXUNUSED(data), 
			 int WXUNUSED(size), int WXUNUSED(format) ) { return FALSE; };

  // Callbacks to BOTH

  // Default behaviour is to delete connection and return TRUE
  virtual bool OnDisconnect(void) = 0;
};

class WXDLLEXPORT wxServerBase: public wxObject
{
  DECLARE_CLASS(wxServerBase)
 public:

  inline wxServerBase(void) {}
  inline ~wxServerBase(void) {};
  virtual bool Create(const wxString& serverName) = 0; // Returns FALSE if can't create server (e.g. port
                                  // number is already in use)
  virtual wxConnectionBase *OnAcceptConnection(const wxString& topic) = 0;

};

class WXDLLEXPORT wxClientBase: public wxObject
{
  DECLARE_CLASS(wxClientBase)
 public:
  inline wxClientBase(void) {};
  inline ~wxClientBase(void) {};
  virtual bool ValidHost(const wxString& host) = 0;
  virtual wxConnectionBase *MakeConnection(const wxString& host, const wxString& server, const wxString& topic) = 0;
                                                // Call this to make a connection.
                                                // Returns NULL if cannot.
  virtual wxConnectionBase *OnMakeConnection(void) = 0; // Tailor this to return own connection.

};

#endif
    // _WX_IPCBASEH__