/*
Copyright (C) 1999-2007 id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant 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 2 of the License, or
(at your option) any later version.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

//-----------------------------------------------------------------------------
//
// DESCRIPTION:
// interface for all-purpose messaging and UI
// window class for MFC, Gtk or Q3 UI
// each version of Radiant implements the API, using the native code that it needs

#ifndef __IUI_H_
#define __IUI_H_

// this one can be hooked in the GL window procs for customizing GUI through plugins
// the class is implemented by the plugin module, and given to Radiant who calls into it
class IWindowListener
{
public:
  // Increment the number of references to this object
  virtual void IncRef () = 0;
  // Decrement the reference count
  virtual void DecRef () = 0;
  // since Radiant is MFC we don't use a WNDPROC, we wrap the MFC handlers
  // the handler is called first, if returns false Radiant continues processing
  //++timo maybe add more later ? OnKeyUp and OnKeyDown for instance
  //++timo TODO: add handlers everywhere
  // Gef: Changed 2nd & 3rd params to gdouble's for sub-integer grid sizes
  virtual bool OnLButtonDown(guint32 nFlags, gdouble x, gdouble y) = 0;
  virtual bool OnMButtonDown(guint32 nFlags, gdouble x, gdouble y) = 0;
  virtual bool OnRButtonDown(guint32 nFlags, gdouble x, gdouble y) = 0;
  virtual bool OnLButtonUp(guint32 nFlags, gdouble x, gdouble y) = 0;
  virtual bool OnMButtonUp(guint32 nFlags, gdouble x, gdouble y) = 0;
  virtual bool OnRButtonUp(guint32 nFlags, gdouble x, gdouble y) = 0;
  virtual bool OnMouseMove(guint32 nFlags, gdouble x, gdouble y) = 0;
  virtual bool OnKeyPressed(char *s) = 0;

  // paint message, the caller makes the GL context current, calls Paint, then swaps GL buffers
  // return value might be false if something failed and closure is requested .. then the buffer swap will be cancelled
  virtual bool Paint() = 0;
  // window is closing (nothing you can do, just telling)
  virtual void Close() = 0;
};

// IWindowListener with additional properties
// NOTE: for now it is both a window and the GL widget
//   in the case of Gtk, there are two widgets, the window widget (a container) and the GL widget
class IWindow
{
public:
  // Increment the number of references to this object
  virtual void IncRef () = 0;
  // Decrement the reference count
  virtual void DecRef () = 0;
  // misc data ------------------------------------------------
  // get pixel size
  virtual int getHeight() = 0;
  virtual int getWidth() = 0;
  // initialisation stuff -------------------------------------
  // set pixel size and other parameters before showing it
  virtual void setSizeParm(int width, int height) = 0;
  // set the IWindowListener (implemented by the plugin using this window)
  virtual void setListener(IWindowListener *) = 0;
  // set the window name
  virtual void setName(char *) = 0;
  // will actually create the GL and the window based on the parameters
  virtual bool Show() = 0;
  // commands -------------------------------------------------
  // call this to ask for a Redraw
  virtual void Redraw() = 0;
};

// various Radiant messages --------
// this one holds the total number of supported messages (this is used to allocate structs)
#define RADIANT_MSGCOUNT 5
// they start with a 0, can be indexed in an array
// something was selected / deselected
#define RADIANT_SELECTION 0
// a brush face was selected / deselected
#define RADIANT_SFACE     1
// current texture / shader changed
#define RADIANT_TEXTURE   2
// Radiant is going to enter "sleep mode" (all GL contexts will be destroyed)
#define RADIANT_SLEEP     3
// Radiant has left "sleep mode" (GL contexts are recreated)
#define RADIANT_WAKEUP    4


// this one can be used to listen for Radiant-specific events, not related to a window
class IListener
{
public:
  // Increment the number of references to this object
  virtual void IncRef () = 0;
  // Decrement the reference count
  virtual void DecRef () = 0;
  // message is one of the RADIANT_* consts
  virtual void DispatchRadiantMsg( int Msg ) = 0;
};

// this one is provided by Radiant, it's a wrapper for some usefull functions
class IXYWndWrapper
{
public:
  virtual void SnapToGrid( int x1, int y1, vec3_t pt ) = 0;
  virtual VIEWTYPE GetViewType( void ) = 0;
};

#define UI_MAJOR "ui"

// create an IWindow with GL context
typedef IWindow* (WINAPI* PFN_QERAPP_CREATEGLWINDOW) ();

// will hook the given IWindowListener to the XY window and increment the ref count
//++timo TODO: add hooking in the CAM view and Z view
typedef void (WINAPI* PFN_QERAPP_HOOKWINDOW)	(IWindowListener *);
// will unhook the given IWindowListener
typedef void (WINAPI* PFN_QERAPP_UNHOOKWINDOW)	(IWindowListener *);
// to retrieve the IXYWndWrapper
typedef IXYWndWrapper* (WINAPI* PFN_QERAPP_GETXYWNDWRAPPER)	();

// will hook a given listener into Radiant listening for the given message and increment ref count
// call several times to listen for several messages
typedef void (WINAPI* PFN_QERAPP_HOOKLISTENER)	(IListener *, int Msg);
// will unhook the listener and return the number of messages the given listener was removed from
typedef int  (WINAPI* PFN_QERAPP_UNHOOKLISTENER)(IListener *);

// TODO: create GL widget, destroy it

struct _QERUITable
{
  int m_nSize;
  PFN_QERAPP_CREATEGLWINDOW m_pfnCreateGLWindow;
  PFN_QERAPP_HOOKWINDOW		m_pfnHookWindow;
  PFN_QERAPP_UNHOOKWINDOW	m_pfnUnHookWindow;
  PFN_QERAPP_GETXYWNDWRAPPER	m_pfnGetXYWndWrapper;
  PFN_QERAPP_HOOKLISTENER	m_pfnHookListener;
  PFN_QERAPP_UNHOOKLISTENER	m_pfnUnHookListener;
};

#endif