/*
	osgLua: use Lua to access dynamically to osg using osgIntrospection
	Copyright(C) 2006 Jose L. Hidalgo Valiño (PpluX) (pplux at pplux.com)

    This library is open source and may be redistributed and/or modified under  
    the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
    (at your option) any later version.  The full license is in LICENSE file
    included with this distribution, and on the openscenegraph.org website.
    
    This library 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 
    OpenSceneGraph Public License for more details.
*/

#ifndef OSGLUA_CALLBACK_
#define OSGLUA_CALLBACK_

#if defined(_MSC_VER)
	#  if defined( _LIB ) || defined( USE_STATIC )
	#    define OSGLUA_API
	#  elif defined( OSGLUA_LIBRARY )
	#    define OSGLUA_API   __declspec(dllexport)
	#  else
	#    define OSGLUA_API   __declspec(dllimport)
	#  endif /* OSGLUA_API */
#else
	#  define OSGLUA_API
#endif 

#include <osgLua/Script>

extern "C" {
	#include "lua.h"
}

namespace osgLua {

	class OSGLUA_API Callback {
	public:
		/// creates a callback using funcName in the Script s.
		Callback(Script *s, const char *funcName);

		/// creates a callback directly using a lua_State
		Callback(lua_State *L);

	protected:
		typedef const osgIntrospection::Value &P;
		virtual ~Callback();

		void execute();
		void execute(P);
		void execute(P,P);
		void execute(P,P,P);
		void execute(P,P,P,P);

	private:
		void init(lua_State *L);
		void pushFunc();
		void call(int num);

		osg::ref_ptr<Script> _script;
		int _ref;
		lua_State *_L;
	};

} // end of osgLua namespace


/*************************************************************/
/********************* osg::NodeCallback *********************/
/*************************************************************/
#include <osg/Node>
#include <osg/NodeVisitor>
#include <osg/NodeCallback>
#include <iostream>

namespace osgLua {

	class OSGLUA_API NodeCallback :
		public osg::NodeCallback, 
		public Callback
	{
	public:
		NodeCallback(Script *s, const char *name) : Callback(s,name) {}
		NodeCallback(lua_State *L) : Callback(L) {}

		void operator() (osg::Node *node, osg::NodeVisitor *nv)
		{ 
			execute(node,nv);
		}
		// A function to create a NodeCallback from lua
		static int createFromLua(lua_State *L);
	protected:
		virtual ~NodeCallback() {}
	};

} // end of osgLua namespace


#endif