/*
* Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
* Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
* Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
*/

#ifndef ACORE_THREADINGMODEL_H
#define ACORE_THREADINGMODEL_H

/**
 * @class ThreadingModel<T>
 *
 */

#include "Define.h"

namespace acore
{
    template<typename MUTEX>
    class GeneralLock
    {
    public:
        GeneralLock(MUTEX& m)
            : i_mutex(m)
        {
            i_mutex.lock();
        }

        ~GeneralLock()
        {
            i_mutex.unlock();
        }

    private:
        GeneralLock(const GeneralLock&);
        GeneralLock& operator=(const GeneralLock&);
        MUTEX& i_mutex;
    };

    template<class T>
    class SingleThreaded
    {
    public:
        struct Lock                                     // empty object
        {
            Lock()
            {
            }
            Lock(const T&)
            {
            }

            Lock(const SingleThreaded<T>&)              // for single threaded we ignore this
            {
            }
        };
    };

    template<class T, class MUTEX>
    class ObjectLevelLockable
    {
    public:
        ObjectLevelLockable()
            : i_mtx()
        {
        }

        friend class Lock;

        class Lock
        {
        public:
            Lock(ObjectLevelLockable<T, MUTEX>& host)
                : i_lock(host.i_mtx)
            {
            }

        private:
            GeneralLock<MUTEX> i_lock;
        };

    private:
        // prevent the compiler creating a copy construct
        ObjectLevelLockable(const ObjectLevelLockable<T, MUTEX>&);
        ObjectLevelLockable<T, MUTEX>& operator=(const ObjectLevelLockable<T, MUTEX>&);

        MUTEX i_mtx;
    };

    template<class T, class MUTEX>
    class ClassLevelLockable
    {
    public:
        ClassLevelLockable()
        {
        }

        friend class Lock;

        class Lock
        {
        public:
            Lock(const T& /*host*/)
            {
                ClassLevelLockable<T, MUTEX>::si_mtx.lock();
            }

            Lock(const ClassLevelLockable<T, MUTEX>&)
            {
                ClassLevelLockable<T, MUTEX>::si_mtx.lock();
            }

            Lock()
            {
                ClassLevelLockable<T, MUTEX>::si_mtx.lock();
            }

            ~Lock()
            {
                ClassLevelLockable<T, MUTEX>::si_mtx.unlock();
            }
        };

    private:
        static MUTEX si_mtx;
    };
}

template<class T, class MUTEX> MUTEX acore::ClassLevelLockable<T, MUTEX>::si_mtx;

#define INSTANTIATE_CLASS_MUTEX(CTYPE, MUTEX) \
    template class acore::ClassLevelLockable<CTYPE, MUTEX>

#endif