/***
    Copyright (C) 2021-2024 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuConditionVariable.Generic.hpp
    Date: 2021-6-14
    Author: Reece
***/
#pragma once

#include "AuIConditionMutexEx.hpp"

#if defined(AURORA_IS_MODERNNT_DERIVED)
    #include "AuConditionVariable.NT.hpp"
#elif defined(AURORA_IS_LINUX_DERIVED)
    #include "AuConditionVariable.Linux.hpp"
#else
    #define _AURUNTIME_GENERICCV
    #include "AuConditionMutex.Generic.hpp"

    namespace Aurora::Threading::Primitives
    {
    #pragma pack(push)
    #pragma pack(4)
        struct ConditionVariableGeneric final
        {
            ConditionVariableGeneric();
            ~ConditionVariableGeneric();

            bool WaitForSignalNsEx(GenericConditionMutex *pMutex, AuUInt64 timeout, bool bSpin = true);
            void Signal();
            void Broadcast();
            bool WaitOne(AuUInt64 qwTimeout, bool bSpin);

        private:
            bool TryTakeOneNoSpin();
            bool TryTakeOneSpin();

            AuUInt32 uState_ {};
            AuUInt32 uSleeping_ {};
        };
    #pragma pack(pop)

        using ConditionVariableInternal = ConditionVariableGeneric;

        struct ConditionVariableGenericImpl final : IConditionVariable
        {
            inline ConditionVariableGenericImpl(const AuSPtr<IConditionMutex> &mutex) :
                mutex(mutex)
            { }

            auline AuSPtr<IConditionMutex> GetMutex() override
            {
                return mutex;
            }

            auline bool WaitForSignal(AuUInt32 timeout) override
            {
                return cond.WaitForSignalNsEx(&std::static_pointer_cast<ConditionMutexGenericImpl>(this->mutex)->mutex, AuMSToNS<AuUInt64>(timeout));
            }

            auline bool WaitForSignalNS(AuUInt64 qwTimeout) override
            {
                return cond.WaitForSignalNsEx(&std::static_pointer_cast<ConditionMutexGenericImpl>(this->mutex)->mutex, qwTimeout);
            }

            inline bool WaitForSignalNsEx(const std::shared_ptr<GenericConditionMutex> &pMutex, AuUInt64 timeout)
            {
                return cond.WaitForSignalNsEx(pMutex.get(), timeout);
            }

            auline void Signal() override
            {
                cond.Signal();
            }

            auline void Broadcast() override
            {
                cond.Broadcast();
            }

            ConditionVariableGeneric cond;
            std::shared_ptr<IConditionMutex> mutex;
        };

        static const auto kSizeOfDummyCondVar = sizeof(ConditionVariableInternal);
    }
#endif