/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: LockGuard.hpp
    Date: 2021-6-10
    Author: Reece
***/
#pragma once

namespace Aurora::Threading
{
    template<typename T>
    class LockGuard
    {
    private:
        using Internal_t = AuRemovePointer_t<T>;

    public:
        
        LockGuard(T &lock) 
        {
            if constexpr (AuIsPointer_v<T>)
            {
                annoying_ = lock;
            }
            else
            {
                annoying_ = &lock;
            }

            if constexpr (AuIsBaseOfTemplate<AURORA_RUNTIME_AU_SHARED_PTR, Internal_t>::value || AuIsBaseOfTemplate<AURORA_RUNTIME_AU_UNIQUE_PTR, Internal_t>::value)
            {
                annoying_->get()->Lock();
            }
            else
            {
                annoying_->Lock();
            }

            constructed_ = true;
        }

        LockGuard(T &&lock) 
        {
            if constexpr (AuIsPointer_v<T>)
            {
                annoying_ = lock;
            }
            else
            {
                annoying_ = &lock;
            }

            if constexpr (AuIsBaseOfTemplate<AURORA_RUNTIME_AU_SHARED_PTR, Internal_t>::value || AuIsBaseOfTemplate<AURORA_RUNTIME_AU_UNIQUE_PTR, Internal_t>::value)
            {
                annoying_->get()->Lock();
            }
            else
            {
                annoying_->Lock();
            }

            constructed_ = true;
        }

        ~LockGuard()
        {
            if (!constructed_)
            {
                return;
            }

            if constexpr (AuIsBaseOfTemplate<AURORA_RUNTIME_AU_SHARED_PTR, Internal_t>::value || AuIsBaseOfTemplate<AURORA_RUNTIME_AU_UNIQUE_PTR, Internal_t>::value)
            {
                annoying_->get()->Unlock();
            }
            else
            {
                annoying_->Unlock();
            }
        }

    private:
        AuConditional_t<AuIsPointer_v<T>, T, T*> annoying_;
        bool constructed_ {};
    };
    
    #define AU_LOCK_GUARD(variable) Aurora::Threading::LockGuard<decltype(variable)>  AU_CONCAT(__stack_lock, __COUNTER__) (variable);
}