/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   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.
 *
 *   Author:
 *      Fabian 'x3n' Landau
 *   Co-authors:
 *      ...
 *
 */

/**
    @file
    @ingroup Class Identifier
    @brief Declaration of Identifiable, the base of all classes that should own an Identifier.

    It stores the Identifier and has all needed functions to create and use the class-hierarchy.
*/

#ifndef _Identifiable_H__
#define _Identifiable_H__

#include "core/CorePrereqs.h"

#include <set>
#include <vector>

namespace orxonox
{
    /**
        @brief Identifiable is needed to create the class-hierarchy at startup and to store the Identifier.
    */
    class _CoreExport Identifiable
    {
        template <class T>
        friend class ClassIdentifier;

        public:
            Identifiable();
            virtual ~Identifiable() {}

            /// Returns the Identifier of the object.
            inline Identifier* getIdentifier() const { return this->identifier_; }

            bool isA(const Identifier* identifier);
            bool isExactlyA(const Identifier* identifier);
            bool isChildOf(const Identifier* identifier);
            bool isDirectChildOf(const Identifier* identifier);
            bool isParentOf(const Identifier* identifier);
            bool isDirectParentOf(const Identifier* identifier);

            /// Returns true if the object's class is of the given type or a derivative.
            template <class B> inline bool isA(const SubclassIdentifier<B>* identifier)
                { return this->isA(*identifier); }
            /// Returns true if the object's class is exactly of the given type.
            template <class B> inline bool isExactlyA(const SubclassIdentifier<B>* identifier)
                { return this->isExactlyA(*identifier); }
            /// Returns true if the object's class is a child of the given type.
            template <class B> inline bool isChildOf(const SubclassIdentifier<B>* identifier)
                { return this->isChildOf(*identifier); }
            /// Returns true if the object's class is a direct child of the given type.
            template <class B> inline bool isDirectChildOf(const SubclassIdentifier<B>* identifier)
                { return this->isDirectChildOf(*identifier); }
            /// Returns true if the object's class is a parent of the given type.
            template <class B> inline bool isParentOf(const SubclassIdentifier<B>* identifier)
                { return this->isParentOf(*identifier); }
            /// Returns true if the object's class is a direct parent of the given type.
            template <class B> inline bool isDirectParentOf(const SubclassIdentifier<B>* identifier)
                { return this->isDirectParentOf(*identifier); }

            bool isA(const Identifiable* object);
            bool isExactlyA(const Identifiable* object);
            bool isChildOf(const Identifiable* object);
            bool isDirectChildOf(const Identifiable* object);
            bool isParentOf(const Identifiable* object);
            bool isDirectParentOf(const Identifiable* object);

            /**
            @brief
                Returns a valid pointer of any derived type that is
                registered in the class hierarchy.
            @return
                Returns nullptr if the no pointer was found.
            */
            ORX_FORCEINLINE void* getDerivedPointer(unsigned int classID)
            {
                for (int i = this->objectPointers_.size() - 1; i >= 0; --i)
                {
                    if (this->objectPointers_[i].first == classID)
                        return this->objectPointers_[i].second;
                }
                return nullptr;
            }

            /// Version of getDerivedPointer with template
            template <class T> ORX_FORCEINLINE T* getDerivedPointer(unsigned int classID)
            {   return static_cast<T*>(this->getDerivedPointer(classID));   }
            /// Const version of getDerivedPointer with template
            template <class T> ORX_FORCEINLINE const T* getDerivedPointer(unsigned int classID) const
            {   return const_cast<Identifiable*>(this)->getDerivedPointer<T>(classID);   }

        private:
            Identifier* identifier_;               //!< The Identifier of the object

            /// 'Fast map' that holds this-pointers of all derived types
            std::vector<std::pair<unsigned int, void*>> objectPointers_;
    };
}

#endif /* _Identifiable_H__ */