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/*
 * Copyright © 2008 Dennis Kasprzyk
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of
 * Dennis Kasprzyk not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior permission.
 * Dennis Kasprzyk makes no representations about the suitability of this
 * software for any purpose. It is provided "as is" without express or
 * implied warranty.
 *
 * DENNIS KASPRZYK DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
 * NO EVENT SHALL DENNIS KASPRZYK BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Authors: Dennis Kasprzyk <onestone@compiz-fusion.org>
 */

#ifndef _COMPWRAPSYSTEM_H_
#define _COMPWRAPSYSTEM_H_

#include <stdlib.h>
#include <vector>

#define WRAPABLE_DEF(func, ...) 		 \
{ 						 \
    mHandler-> func ## SetEnabled (this, false); \
    return mHandler-> func (__VA_ARGS__); 	 \
}

#define WRAPABLE_HND(num,itype,rtype, func, ...) 	\
   rtype func (__VA_ARGS__); 				\
   void  func ## SetEnabled (itype *obj, bool enabled)	\
   {							\
       functionSetEnabled (obj, num, enabled);		\
   }							\
   unsigned int func ## GetCurrentIndex ()		\
   {							\
       return mCurrFunction[num];			\
   }							\
   void func ## SetCurrentIndex (unsigned int index)	\
   {							\
       mCurrFunction[num] = index;			\
   }

#define WRAPABLE_HND_FUNC(num, func, ...) 				\
{ 									\
    unsigned int curr = mCurrFunction[num]; 				\
    while (mCurrFunction[num] < mInterface.size() && 			\
           !mInterface[mCurrFunction[num]].enabled[num]) 		\
        mCurrFunction[num]++;						\
    if (mCurrFunction[num] < mInterface.size()) 			\
    { 									\
	mInterface[mCurrFunction[num]++].obj-> func (__VA_ARGS__); 	\
	mCurrFunction[num] = curr; 					\
	return; 							\
    } 									\
    mCurrFunction[num] = curr; 						\
}

#define WRAPABLE_HND_FUNC_RETURN(num, rtype, func, ...) 		\
{ 									\
    unsigned int curr = mCurrFunction[num]; 				\
    rtype rv; 								\
    while (mCurrFunction[num] < mInterface.size() && 			\
           !mInterface[mCurrFunction[num]].enabled[num]) 		\
        mCurrFunction[num]++; 						\
    if (mCurrFunction[num] < mInterface.size()) 			\
    { 									\
	rv = mInterface[mCurrFunction[num]++].obj-> func (__VA_ARGS__); \
	mCurrFunction[num] = curr; 					\
	return rv; 							\
    } 									\
    mCurrFunction[num] = curr; 						\
}

template <typename T, typename T2>
class WrapableInterface {
    protected:
	WrapableInterface () : mHandler(0) {};
	virtual ~WrapableInterface ()
	{
	    if (mHandler)
		mHandler->unregisterWrap (static_cast<T2*> (this));
	};

	void setHandler (T *handler, bool enabled = true)
	{
	    if (mHandler)
		mHandler->unregisterWrap (static_cast<T2*> (this));
	    if (handler)
		handler->registerWrap (static_cast<T2*> (this), enabled);
	    mHandler = handler;
	}
        T *mHandler;
};

template <typename T, unsigned int N>
class WrapableHandler : public T {
		
    public:
	void registerWrap (T *, bool);
	void unregisterWrap (T *);

 	unsigned int numWrapClients () { return mInterface.size (); };
	
    protected:

	class Interface {
	    public:
		T    *obj;
		bool *enabled;
	};

	WrapableHandler () : mInterface ()
	{
	    mCurrFunction = new unsigned int [N];
	    if (!mCurrFunction)
		abort ();
	    for (unsigned int i = 0; i < N; i++)
		mCurrFunction[i] = 0;
	};

	~WrapableHandler ()
	{
	    typename std::vector<Interface>::iterator it;
		for (it = mInterface.begin(); it != mInterface.end(); it++)
		    delete [] (*it).enabled;
	    mInterface.clear ();
	    delete [] mCurrFunction;
	};

	void functionSetEnabled (T *, unsigned int, bool);

	unsigned int *mCurrFunction;
        std::vector<Interface> mInterface;
};

template <typename T, unsigned int N>
void WrapableHandler<T,N>::registerWrap (T *obj, bool enabled)
{
    typename WrapableHandler<T,N>::Interface in;
    in.obj = obj;
    in.enabled = new bool [N];
    if (!in.enabled)
	return;
    for (unsigned int i = 0; i < N; i++)
	in.enabled[i] = enabled;
    mInterface.insert (mInterface.begin(), in);
};

template <typename T, unsigned int N>
void WrapableHandler<T,N>::unregisterWrap (T *obj)
{
    typename std::vector<Interface>::iterator it;
    for (it = mInterface.begin(); it != mInterface.end(); it++)
	if ((*it).obj == obj)
	{
	    delete [] (*it).enabled;
	    mInterface.erase (it);
	    break;
	}
}

template <typename T, unsigned int N>
void WrapableHandler<T,N>::functionSetEnabled (T *obj, unsigned int num,
					       bool enabled)
{
    for (unsigned int i = 0; i < mInterface.size(); i++)
	if (mInterface[i].obj == obj)
	{
	    mInterface[i].enabled[num] = enabled;
	    break;
	}
}

#endif