/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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.

 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

/*
 * This code is based on Broken Sword 2.5 engine
 *
 * Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
 *
 * Licensed under GNU GPL v2
 *
 */

#ifndef SWORD25_CALLBACK_REGISTRY_H
#define SWORD25_CALLBACK_REGISTRY_H

// -----------------------------------------------------------------------------
// Includes
// -----------------------------------------------------------------------------

#include "common/scummsys.h"
#include "common/str.h"
#include "common/hash-str.h"
#include "common/hashmap.h"
#include "sword25/kernel/bs_stdint.h"
#include "sword25/kernel/common.h"

namespace Sword25 {

// -----------------------------------------------------------------------------
// Klassendeklaration
// -----------------------------------------------------------------------------

typedef void (*CallbackPtr)(int command);

class CallbackRegistry {
public:
	static CallbackRegistry &getInstance() {
		static CallbackRegistry _instance;
		return _instance;
	}

	bool        registerCallbackFunction(const Common::String &name, CallbackPtr ptr);
	CallbackPtr     resolveCallbackFunction(const Common::String &name) const;
	Common::String  resolveCallbackPointer(CallbackPtr ptr) const;

private:
	typedef Common::HashMap<Common::String, CallbackPtr, Common::CaseSensitiveString_Hash, Common::CaseSensitiveString_EqualTo> NameToPtrMap;
	NameToPtrMap _nameToPtrMap;

	struct CallbackPtr_EqualTo {
		bool operator()(CallbackPtr x, CallbackPtr y) const {
			return x == y;
		}
	};
	struct CallbackPtr_Hash {
		uint operator()(CallbackPtr x) const {
			return static_cast<uint>((int64)x % ((int64)1 << sizeof(uint)));
		}
	};

	typedef Common::HashMap<CallbackPtr, Common::String, CallbackPtr_Hash, CallbackPtr_EqualTo> PtrToNameMap;
	PtrToNameMap _ptrToNameMap;

	CallbackPtr     findPtrByName(const Common::String &name) const;
	Common::String  findNameByPtr(CallbackPtr ptr) const;
	void        storeCallbackFunction(const Common::String &name, CallbackPtr ptr);
};

} // End of namespace Sword25

#endif