/***
    Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: LoopQueue.NT.cpp
    Date: 2022-1-8
    Author: Reece
    Note: Win32 sewage lmao
***/
#include <Source/RuntimeInternal.hpp>
#include "Loop.NT.hpp"
#include "ILoopSourceEx.hpp"
#include "LSWin32.NT.hpp"
#include "LoopQueue.NT.hpp"

static bool WaitToRetStatus(DWORD ret)
{
    return  !((ret == WAIT_TIMEOUT) ||
              (ret == WAIT_IO_COMPLETION) ||
              (ret == WAIT_FAILED));
}

static bool WaitStatusFromAligned(DWORD ret, bool active)
{
    return (WaitToRetStatus(ret) && ((active) || (ret != WAIT_OBJECT_0 /*lock releaser*/)));
}

namespace Aurora::IO::Loop
{
    void ResetLoopSourceFalseAlarm(const AuSPtr<Loop::ILoopSource> &pLoopSource);

    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Loop Queue :: Extended Handle
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    LoopQueue::ExtendedSourceInfo::ExtendedSourceInfo(const AuSPtr<ILoopSourceEx> &in) : source(in), timeoutAbs(0)
    {

    }

    bool LoopQueue::ExtendedSourceInfo::ConsiderTimeout(AuUInt64 time) const
    {
        if (!this->timeoutAbs)
        {
            return false;
        }

        if (time < this->timeoutAbs)
        {
            return false;
        }

        for (const auto &handler : callbacks.extended)
        {
            try
            {
                handler->OnTimeout(sourceBase);
            }
            catch (...)
            {
                SysPushErrorCatch();
            }
        }

        return true;
    }

    AuPair<bool, bool> LoopQueue::ExtendedSourceInfo::DoWork(LoopQueue *queue, AuUInt handle)
    {
        bool bShouldRemove {true};
        AuUInt8 uPosition {};

        if (this->source && handle != -1)
        {
            if (!this->source->OnTrigger(handle))
            {
                return {};
            }
        }

        bool bOverload {};

        {
            AU_LOCK_GUARD(&this->lock);

            if ((this->callbacks.base.empty()) &&
                (this->callbacks.extended.empty()))
            {
                bOverload = true;
            }

            // Notify callbacks...
            for (auto itr = this->callbacks.extended.begin();
                      itr != this->callbacks.extended.end(); )
            {
                bool result;
                auto handler = *itr;

                try
                {
                    AU_DEBUG_REVERSE_MEMCRUNCH;

                    result = handler->OnFinished(this->sourceBase, uPosition++);
                }
                catch (...)
                {
                    SysPushErrorCatch();
                }

                bShouldRemove &= result;

                if (result)
                {
                    itr = this->callbacks.extended.erase(itr);
                }
                else
                {
                    itr++;
                }
            }

            for (auto itr = this->callbacks.base.begin();
                      itr != this->callbacks.base.end(); )
            {
                bool result;
                auto handler = *itr;

                try
                {
                    AU_DEBUG_REVERSE_MEMCRUNCH;

                    result = handler->OnFinished(this->sourceBase);
                }
                catch (...)
                {
                    SysPushErrorCatch();
                }

                bShouldRemove &= result;

                if (result)
                {
                    itr = this->callbacks.base.erase(itr);
                }
                else
                {
                    itr++;
                }
            }
        }

        // Evict when subs count hit zero, not when sub count started off at zero
        if (bOverload)
        {
            bShouldRemove = false;
        }

        // Notify global subscribers, allowing them to preempt removal
        if (bShouldRemove || bOverload)
        {
            AU_LOCK_GUARD(queue->sourceMutex_);
            for (const auto &handler : queue->globalSubcribers_)
            {
                try
                {
                    AU_DEBUG_REVERSE_MEMCRUNCH;

                    bShouldRemove &= handler->OnFinished(this->sourceBase);
                }
                catch (...)
                {
                    SysPushErrorCatch();
                }
            }
        }

        return AuMakePair(true, bShouldRemove);
    }

    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Loop Queue
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    LoopQueue::LoopQueue()
    {
        this->hEvent_ = ::CreateEventW(NULL, true, false, NULL);
        this->hDummy_ = ::CreateEventW(NULL, true, true, NULL);
    }

    LoopQueue::~LoopQueue()
    {
        AuWin32CloseHandle(this->hEvent_);
        AuWin32CloseHandle(this->hDummy_);
    }

    bool LoopQueue::Init()
    {
        return true;
    }

    bool LoopQueue::IsValid()
    {
        return this->hEvent_ != INVALID_HANDLE_VALUE && this->handleArrayOr_.size() && this->handleArrayAnd_.size();
    }

    struct LoopJoinable
    {
        LoopQueue *that;
        void Lock()
        {
            that->Sync();
        }

        bool TryLock()
        {
            return that->Sync2();
        }

        void Unlock()
        {
            that->Unlock();
        }
    };

    void LoopQueue::Sync()
    {
        if (this->hEvent_ == INVALID_HANDLE_VALUE)
        {
            this->rwMutex_->AsWritable()->Lock();
            return;
        }

        ::SetEvent(this->hEvent_);

        this->rwMutex_->AsWritable()->Lock();

        ::ResetEvent(this->hEvent_);
    }

    bool LoopQueue::Sync2()
    {
        if (this->hEvent_ != INVALID_HANDLE_VALUE)
        {
            ::SetEvent(this->hEvent_);
        }

        if (!this->rwMutex_->AsWritable()->TryLock())
        {
            return false;
        }

        if (this->hEvent_ != INVALID_HANDLE_VALUE)
        {
            ::ResetEvent(this->hEvent_);
        }
        return true;
    }

    void LoopQueue::Unlock()
    {
        this->rwMutex_->AsWritable()->Unlock();
    }

    bool LoopQueue::SourceAdd(const AuSPtr<ILoopSource> &source)
    {
        AU_LOCK_GUARD(this->sourceMutex_);

        if (!AuTryInsert(this->addedSources_, AuMakeTuple(source, 0, SourceCallbacks {})))
        {
            return false;
        }

        return true;
    }

    bool LoopQueue::SourceAddWithTimeout(const AuSPtr<ILoopSource> &source, AuUInt32 maxTimeout)
    {
        AU_LOCK_GUARD(this->sourceMutex_);

        if (!AuTryInsert(this->addedSources_, AuMakeTuple(source, AuTime::SteadyClockMS() + maxTimeout, SourceCallbacks {})))
        {
            return false;
        }

        return true;
    }

    bool LoopQueue::SourceRemove(const AuSPtr<ILoopSource> &source)
    {
        AU_LOCK_GUARD(this->sourceMutex_);
        return AuTryInsert(this->removedSources_, source) || AuTryRemoveByTupleN<0>(this->addedSources_, source);
    }

    bool LoopQueue::RemoveSourceNB(const AuSPtr<ILoopSource> &source)
    {
        if (source->GetType() == ELoopSource::eSourceWin32)
        {
            this->msgSource_.reset();
            this->msgCallbacks_ = {};
            this->bIsWinLoop_ = false;
            return {};
        }

        bool bRebuildFromAnd {};

        Iterator queueIterator(this);
        for (queueIterator.Start();
             queueIterator.End() != queueIterator.itr; )
        {
            if (queueIterator.itr->sourceBase == source)
            {
                if (queueIterator.itr->source)
                {
                    auto count = queueIterator.itr->source->Singular() ? 1 : queueIterator.itr->source->GetHandles().size();

                    if (this->handleArrayOr_.size() <= MAXIMUM_WAIT_OBJECTS)
                    {
                        AuRemoveRange(this->handleArrayOr_, queueIterator.startingIndexOr, count);
                        AuRemoveRange(this->handleArrayAnd_, queueIterator.startingIndexAnd, count);
                    }
                    else
                    {
                        bRebuildFromAnd = true;
                        AuRemoveRange(this->handleArrayAnd_, queueIterator.startingIndexAnd, count);
                    }

                    queueIterator.Delete(this->loopSourceExs_.erase(queueIterator.itr));
                    break;
                }
                else
                {
                    queueIterator.Delete(this->loopSourceExs_.erase(queueIterator.itr));
                    break;
                }
            }

            queueIterator.Next();
        }

        return bRebuildFromAnd;
    }

    bool LoopQueue::Commit()
    {
        if (this->isCommitableInFuture_)
        {
            this->willCommitInFuture_ = true;
            return true;
        }

        LoopJoinable joinable {this};
        AU_TRY_LOCK_GUARD_RET_DEF(joinable);

        return CommitLocked();
    }

    void LoopQueue::BuildFromAndArray()
    {
        this->handleArrayOr_.clear();

        this->handleArrayOr_.reserve(this->handleArrayAnd_.size() + 16);

        for (int i = 0; i < this->handleArrayAnd_.size();  i++)
        {
            if (((this->handleArrayOr_.size() % MAXIMUM_WAIT_OBJECTS)) == 0)
            {
                this->handleArrayOr_.push_back(this->hEvent_);
            }

            this->handleArrayOr_.push_back(this->handleArrayAnd_[i]);
        }
    }

    bool LoopQueue::CommitLocked()
    {
        try
        {
            AU_DEBUG_MEMCRUNCH;
            AU_LOCK_GUARD(this->sourceMutex_);

            bool bShouldRebuild {};

            for (const auto &re : this->removedSources_)
            {
                bShouldRebuild |= this->RemoveSourceNB(re);
            }

            // Reserve the cache arrays for initialization
            this->loopSourceExs_.reserve(this->loopSourceExs_.size() + this->addedSources_.size());
            this->handleArrayAnd_.reserve(this->loopSourceExs_.size() + this->addedSources_.size());
            this->handleArrayOr_.reserve(this->loopSourceExs_.size() + this->addedSources_.size());

            bShouldRebuild |= bool(this->addedSources_.size());

            // 
            for (auto &[source, timeout, callbacks] : this->addedSources_)
            {
                // Filter bad sources
                if (!source)
                {
                    continue;
                }

                // Win32 edge case
                if (source->GetType() == ELoopSource::eSourceWin32)
                {
                    this->bIsWinLoop_ = true;
                    this->msgSource_ = source;
                    this->msgCallbacks_ = AuMove(callbacks);
                    continue;
                }

                // Handle known ILoopSourceEx handle objects
                if (auto extended = AuDynamicCast<ILoopSourceEx>(source))
                {
                    ExtendedSourceInfo t {extended};
                    t.timeoutAbs = timeout;
                    t.sourceBase = source;
                    t.source = extended;
                    t.callbacks = AuMove(callbacks);
                    this->loopSourceExs_.push_back(t);

                    if (extended->Singular())
                    {
                        const auto handle = extended->GetHandle();
                        auto nthandle = reinterpret_cast<HANDLE>(handle);
                        this->handleArrayAnd_.push_back(nthandle);
                    }
                    else
                    {
                        for (const auto &handle : extended->GetHandles())
                        {
                            auto nthandle = reinterpret_cast<HANDLE>(handle);
                            this->handleArrayAnd_.push_back(nthandle);
                        }
                    }
                }
            }

            for (const auto &re : this->removedSources_)
            {
                bShouldRebuild |= this->RemoveSourceNB(re);
            }

            AuTryClear(this->addedSources_);
            AuTryClear(this->removedSources_);

            if (bShouldRebuild)
            {
                BuildFromAndArray();
            }

            return true;
        }
        catch (...)
        {
            return {};
        }
    }

    AuUInt32 LoopQueue::GetSourceCount()
    {
        return this->loopSourceExs_.size();
    }

    void LoopQueue::ChugPathConfigure(AuUInt32 sectionTickTime, AuSInt sectionDequeCount)
    {
        this->slowTickRate_ = AuMin(sectionDequeCount, AuSInt(MAXIMUM_WAIT_OBJECTS));
        this->slowTickMs_ = sectionTickTime ? sectionTickTime : 1;
    }

    void LoopQueue::ChugHint(bool value)
    {
        this->forceChug_ = value;
    }

    bool LoopQueue::AddCallback(const AuSPtr<ILoopSource> &source, const AuSPtr<ILoopSourceSubscriber> &subscriber)
    {
        AU_LOCK_GUARD(this->rwMutex_->AsReadable());

        if (!source)
        {
            SysPushErrorArg();
            return {};
        }

        if (!subscriber)
        {
            SysPushErrorArg();
            return {};
        }


        AuUInt32 count {};
        for (auto &sourceEx : this->loopSourceExs_)
        {
            if (sourceEx.sourceBase != source)
            {
                continue;
            }

            AU_LOCK_GUARD(sourceEx.lock);
            if (!AuTryInsert(sourceEx.callbacks.base, subscriber))
            {
                return {};
            }

            count++;
        }

        if (!count)
        {
            AU_LOCK_GUARD(this->sourceMutex_);
            for (auto &[innerSource, timeout, callbacks] : this->addedSources_)
            {
                if (innerSource == source)
                {
                    if (!AuTryInsert(callbacks.base, subscriber))
                    {
                        return {};
                    }
                    count++;
                }
            }
        }

        if (source->GetType() == ELoopSource::eSourceWin32)
        {
            AU_LOCK_GUARD(this->sourceMutex_);
            return AuTryInsert(this->msgCallbacks_.base, subscriber);
        }

        return count;
    }

    bool LoopQueue::AddCallbackEx(const AuSPtr<ILoopSource> &source, const AuSPtr<ILoopSourceSubscriberEx> &subscriber)
    {
        AU_LOCK_GUARD(this->rwMutex_->AsReadable());

        if (!source)
        {
            SysPushErrorArg();
            return {};
        }

        if (!subscriber)
        {
            SysPushErrorArg();
            return {};
        }


        AuUInt32 count {};
        for (auto &sourceEx : this->loopSourceExs_)
        {
            if (sourceEx.sourceBase != source)
            {
                continue;
            }

            // IMPORTANT: Soft-locks on this line, whose stack traces contain ExtendedSourceInfo::DoWork, are
            //            a re-add during io-tick before removal condition.
            AU_LOCK_GUARD(sourceEx.lock);
            if (!AuTryInsert(sourceEx.callbacks.extended, subscriber))
            {
                return {};
            }

            count++;
        }

        if (!count)
        {
            AU_LOCK_GUARD(this->sourceMutex_);
            for (auto &[innerSource, timeout, callbacks] : this->addedSources_)
            {
                if (innerSource == source)
                {
                    if (!AuTryInsert(callbacks.extended, subscriber))
                    {
                        return {};
                    }
                    count++;
                }
            }
        }

        if (source->GetType() == ELoopSource::eSourceWin32)
        {
            AU_LOCK_GUARD(this->sourceMutex_);
            return AuTryInsert(this->msgCallbacks_.extended, subscriber);
        }
        return count;
    }

    bool LoopQueue::AddCallback(const AuSPtr<ILoopSourceSubscriber> &subscriber)
    {
        AU_LOCK_GUARD(rwMutex_->AsReadable());

        if (!subscriber)
        {
            SysPushErrorArg();
            return {};
        }


        AU_LOCK_GUARD(this->sourceMutex_);
        return AuTryInsert(this->globalSubcribers_, subscriber);
    }

    bool LoopQueue::IsSignaledPeek()
    {
        AuUInt32 askers {};
        bool bAskers {};
        return WaitAnyNBSpurious(0, askers, nullptr, true, bAskers);
    }

    bool LoopQueue::WaitAll(AuUInt32 timeout)
    {
        AU_DEBUG_MEMCRUNCH;

        AU_LOCK_GUARD(this->rwMutex_->AsReadable());

        for (const auto &source : this->loopSourceExs_)
        {
            source.source->OnPresleep();
        }

        bool bFinished {};
        auto bRet = WaitAllEx(timeout, bFinished);

        if (!bFinished)
        {
            for (const auto &source : this->loopSourceExs_)
            {
                source.source->OnFinishSleep();
            }
        }

        return bRet;
    }

    bool LoopQueue::WaitAllEx(AuUInt32 timeout, bool &bFinished)
    {
        bool bReturnStatus {false};
        bool bTimeout {false};
        AuUInt32 count {};
        AuUInt32 index {};

        if (this->handleArrayAnd_.empty())
        {
            return true;
        }

        count = this->handleArrayAnd_.size();

        AuUInt64 startTime = AuTime::SteadyClockNS();
        AuUInt64 endTime   = timeout ? startTime + AuMSToNS<AuUInt64>(timeout) : 0;

        while (count != index)
        {
            auto next = AuMin(count - index, AuUInt32(MAXIMUM_WAIT_OBJECTS));

            startTime = AuTime::SteadyClockNS();

            AuUInt32 timeDelta {};

            if (!timeout)
            {
                timeDelta = INFINITE;
            }
            else
            {
                if (endTime > startTime)
                {
                    timeDelta = AuNSToMS<AuUInt32>(endTime - startTime);
                }
                else if (endTime == startTime)
                {

                }
                else
                {
                    Iterator queueIterator(this);
                    for (queueIterator.Start(); queueIterator.End() != queueIterator.itr; )
                    {
                        auto &source = *queueIterator.itr;

                        if (queueIterator.startingIndexAnd >= index)
                        {
                            break;
                        }

                        ResetLoopSourceFalseAlarm(queueIterator.itr->source);

                        queueIterator.Next();
                    }

                    if (!StartUserAndTakeOwn())
                    {
                        return false;
                    }

                    ConsiderEvicitingTimeoutsAll();
                    StartUserAndTakeOwn_Release();
                    bFinished = true;
                    return false;
                }

                if (!timeDelta)
                {
                    timeDelta = 1;
                }
            }

            DWORD status {};
            do
            {
                if (this->bIsWinLoop_ && 
                    pMsgWaitForMultipleObjectsEx)
                {
                    status = pMsgWaitForMultipleObjectsEx(next, this->handleArrayAnd_.data() + index, timeDelta, QS_ALLPOSTMESSAGE | QS_ALLINPUT | QS_ALLEVENTS, MWMO_INPUTAVAILABLE | MWMO_ALERTABLE | MWMO_WAITALL);
                }
                else
                {
                    status = ::WaitForMultipleObjectsEx(next, this->handleArrayAnd_.data() + index, true, timeDelta, true);
                }
            }
            while (status == WAIT_IO_COMPLETION);

            if (status == WAIT_OBJECT_0 + next)
            {
                TryPumpWin32();
                continue;
            }

            if (WaitToRetStatus(status))
            {
                index += (status + 1);
                continue;
            }

            // Account for win32 failures
            if (status == WAIT_FAILED)
            {
                bReturnStatus = false;
                break;
            }
            
            // Ingore the other unrelated errors (APC notification, timeout, etc)
        }

        // OK - All signals are set

        // Take ownership of the queue ready for a potential purge of objects
        if (!StartUserAndTakeOwn())
        {
            StartUserAndTakeOwn_Release();
            bFinished = true;
            return bReturnStatus;
        }

        // Le great iterate
        Iterator queueIterator(this);
        AuSInt indexOffset {};
        auto now = AuTime::SteadyClockMS();
        for (queueIterator.Start(); queueIterator.End() != queueIterator.itr; )
        {
            auto &source = *queueIterator.itr;

            auto [ticked, bShouldRemove] = source.DoWork(this, source.source->Singular() ? source.source->GetHandle() : source.source->GetHandles()[0]);

            if (!bShouldRemove && source.ConsiderTimeout(now))
            {
                bShouldRemove = true;
            }
            
            if (this->handleArrayOr_[queueIterator.startingIndexOr] == AuReinterpretCast<HANDLE>(this->hDummy_))
            {
                auto handle = AuReinterpretCast<HANDLE>(source.source->Singular() ? source.source->GetHandle() : source.source->GetHandles()[0]);
                this->handleArrayAnd_[queueIterator.startingIndexAnd] = handle;
                this->handleArrayOr_[queueIterator.startingIndexOr] = handle;
            }

            if (!bShouldRemove && !ticked)
            {
                bool bCompletedInTimeout = { };
                AuUInt64 uStartTime {};

                do
                {
                    if (!source.timeoutAbs)
                    {
                        bCompletedInTimeout = source.source->WaitOnAbsExt(0, endTime);
                    }
                    else
                    {
                        bCompletedInTimeout = source.source->WaitOnAbsExt(0, !endTime ? AuMSToNS<AuUInt64>(source.timeoutAbs)  : AuMin(endTime, AuMSToNS<AuUInt64>(source.timeoutAbs)));
                    }
                
                    if (bCompletedInTimeout)
                    {
                        AuTupleTie(ticked, bShouldRemove) = source.DoWork(this, -1);
                        if (!ticked)
                        {
                            bCompletedInTimeout = false;
                        }
                    }
                }
                while (!bCompletedInTimeout && (!timeout || ((uStartTime = AuTime::SteadyClockNS()) < endTime)));
                
                if (!bCompletedInTimeout)
                {
                    Iterator queueIterator2(this);
                    for (queueIterator2.Start(); queueIterator2.End() != queueIterator2.itr; )
                    {
                        auto &source = *queueIterator2.itr;
                
                        if (queueIterator2.startingIndexAnd >= index)
                        {
                            break;
                        }
                
                        if (queueIterator2.itr->source)
                        {
                            ResetLoopSourceFalseAlarm(queueIterator2.itr->source);
                        }

                        queueIterator2.Next();
                    }

                    if (StartUserAndTakeOwn())
                    {
                        ConsiderEvicitingTimeoutsAll();
                        StartUserAndTakeOwn_Release();
                    }
                
                    return false;
                }
                else
                {
                    ticked = true;
                }
            }

            if (ticked)
            {
                bReturnStatus |= true;
            }

            if (bShouldRemove)
            {
                AuStaticCast<ILoopSourceEx>(source.source)->OnFinishSleep();

                if (source.source->GetType() == ELoopSource::eSourceWin32)
                {
                    SysPanic("?");
                }
                else
                {
                    AuUInt uHandles = (source.source->Singular() ? 1 : source.source->GetHandles().size());
                    int sOffset = -((int)uHandles);
                    if (this->handleArrayOr_.size() > MAXIMUM_WAIT_OBJECTS)
                    {
                        this->RemoveSourceNB(source.source);
                        this->willCommitInFuture_ = true;
                    }
                    else
                    {
                        AuRemoveRange(this->handleArrayOr_, queueIterator.startingIndexOr + indexOffset, uHandles);
                        AuRemoveRange(this->handleArrayAnd_, queueIterator.startingIndexAnd + indexOffset, uHandles);
                        queueIterator.Delete(this->loopSourceExs_.erase(queueIterator.itr));
                        continue;
                    }
                }
            }
            //else
            {
                queueIterator.Next();
            }
        }

        bFinished = true;
        StartUserAndTakeOwn_Release();

        return bReturnStatus;
    }

    AuUInt32 LoopQueue::WaitAny(AuUInt32 timeout)
    {
        AuUInt32 ret {};
        bool lastItr {};

        AuUInt64 startTime = AuTime::SteadyClockMS();
        AuUInt64 endTime = timeout ? (startTime + timeout) : AuUInt64(-1);
        AuUInt32 chuggerIndex {};
        bool  bTriggerWin32 {};

        do
        {
            if (WaitAnyNBSpurious(endTime, chuggerIndex, nullptr, false, bTriggerWin32))
            {
                ret++;
            }

            PumpHooks();
        }
        while (!bTriggerWin32 &&
               !ret &&
               WaitForSingleObject(this->hEvent_, 0) == WAIT_OBJECT_0);

        return ret;
    }

    AuList<AuSPtr<ILoopSource>> LoopQueue::WaitAnyEx(AuUInt32 timeout)
    {
        AuList<AuSPtr<ILoopSource>> trigger;

        AuUInt64 startTime = AuTime::SteadyClockMS();
        AuUInt64 endTime = timeout ? (startTime + timeout) : AuUInt64(-1);
        AuUInt32 chuggerIndex {};
        bool  bTriggerWin32 {};

        do
        {
            if (WaitAnyNBSpurious(endTime, chuggerIndex, &trigger, false, bTriggerWin32))
            {
                return trigger;
            }

            PumpHooks();
        }
        while (!bTriggerWin32 &&
               WaitForSingleObject(this->hEvent_, 0) == WAIT_OBJECT_0);

        return trigger;
    }

    AuUInt32 LoopQueue::PumpNonblocking()
    {
        AuUInt32 ret {};
        bool lastItr {};

        bool  bTriggerWin32 {};
        AuUInt32 chuggerIndex {};

        do
        {
            if (WaitAnyNBSpurious(0, chuggerIndex, nullptr, false, bTriggerWin32))
            {
                ret++;
            }

            PumpHooks();
        }
        while (!bTriggerWin32 &&
               !ret &&
               WaitForSingleObject(this->hEvent_, 0) == WAIT_OBJECT_0);

        return ret;
    }

    AuList<AuSPtr<ILoopSource>> LoopQueue::PumpNonblockingEx()
    {
        AuList<AuSPtr<ILoopSource>> trigger;
        AuUInt32 chuggerIndex {};
        bool  bTriggerWin32 {};

        do
        {
            if (WaitAnyNBSpurious(0, chuggerIndex, &trigger, false, bTriggerWin32))
            {
                return trigger;
            }
            PumpHooks();
        }
        while (!bTriggerWin32 &&
               WaitForSingleObject(this->hEvent_, 0) == WAIT_OBJECT_0);

        return trigger;
    }

    bool LoopQueue::ChugWaitAny(AuUInt64 internalEndTime, AuUInt32 &chuggerIndex, AuUInt32 &indexOfTriggered)
    {
        AuUInt32 count {};
        AuUInt32 &index {chuggerIndex};

        count = this->handleArrayOr_.size();
        indexOfTriggered = -1;

        if (index > count) index = 0;
        bool active = this->hEvent_ == INVALID_HANDLE_VALUE;


        while (count != index)
        {
            auto next = AuMin(count - index, AuUInt32(MAXIMUM_WAIT_OBJECTS));

            auto sleepMS = this->slowTickMs_;
            if (internalEndTime && internalEndTime != AuUInt64(-1))
            {
                auto now = AuTime::SteadyClockMS();
                auto delta = AuInt64(internalEndTime) - AuInt64(now);

                if (delta <= 0)
                {
                    return false;
                }

                sleepMS = AuMin(sleepMS, AuUInt32(delta));
            }

            DWORD status {};
            if (this->bIsWinLoop_ &&
                pMsgWaitForMultipleObjectsEx)
            {
                do
                {
                    status = pMsgWaitForMultipleObjectsEx(next, this->handleArrayOr_.data() + index, sleepMS, QS_ALLINPUT | QS_ALLPOSTMESSAGE, MWMO_ALERTABLE);

                    {
                        auto temp2 = status;
                        while (temp2 == WAIT_IO_COMPLETION)
                        {
                            temp2 = SleepEx(0, true);
                        }
                    }
                }
                while (status == WAIT_IO_COMPLETION);

                if (status == next)
                {
                    indexOfTriggered = this->handleArrayOr_.size();
                    return true;
                }
            }
            else
            {
                do
                {
                    if (pNtWaitForMultipleObjects)
                    {
                        AuUInt64 uTimeout = -(AuMSToNS<AuUInt64>(1) / 2ull / 100ull);
                        if (AuSwInfo::IsWindows10OrGreater())
                        {
                            uTimeout /= 2ull;
                        }
                        status = pNtWaitForMultipleObjects(next, this->handleArrayOr_.data() + index, (_OBJECT_WAIT_TYPE)1, TRUE, &uTimeout);
                    }
                    else
                    {
                        status = ::WaitForMultipleObjectsEx(next, this->handleArrayOr_.data() + index, false, sleepMS, true);
                    }
                }
                while (status == WAIT_IO_COMPLETION);
            }

            if (WaitStatusFromAligned(status, active))
            {
                DWORD offset = status - WAIT_OBJECT_0;
                indexOfTriggered = offset + index;
                return true;
            }

            if (status == WAIT_OBJECT_0 && !active)
            {
                return false;
            }
            
            if (status == WAIT_FAILED)
            {
                return false;
            }

            index += count;
        }

        return false;
    }

    bool LoopQueue::WaitAnyNBSpurious(AuUInt64 internalEndTime, AuUInt32 &chuggerIndex, AuList<AuSPtr<ILoopSource>> *trigger, bool poll, bool &bTriggerWin32)
    {
        AU_DEBUG_MEMCRUNCH;

        AU_LOCK_GUARD(this->rwMutex_->AsReadable()); // the spurious wake up comes from an event that tells all to release me

        for (const auto &source : this->loopSourceExs_)
        {
            source.source->OnPresleep();
        }
        
        bool bFinished {};
        auto bRet = WaitAnyNBSpuriousEx(internalEndTime, chuggerIndex, trigger, poll, bTriggerWin32, bFinished);

        if (!bFinished)
        {
            for (const auto &source : this->loopSourceExs_)
            {
                source.source->OnFinishSleep();
            }
        }

        return bRet;
    }

    bool LoopQueue::WaitAnyNBSpuriousEx(AuUInt64 internalEndTime, AuUInt32 &chuggerIndex, AuList<AuSPtr<ILoopSource>> *trigger, bool poll, bool &bTriggerWin32, bool &bFinished)
    {
        bool status {};
        DWORD temp;
        AuUInt32 indexOfTriggered {};
        AuUInt32 triggeredCount {};

        if (trigger)
        {
            trigger->reserve(this->loopSourceExs_.size());
        }

        if (AuExchange(this->bIOUWin32FastPath, false))
        {
            status = this->handleArrayOr_.size();
        }
        else if ((this->handleArrayOr_.size() > MAXIMUM_WAIT_OBJECTS) || (this->forceChug_))
        {
            status = ChugWaitAny(internalEndTime, chuggerIndex, indexOfTriggered);
        }
        else
        {
            AuUInt32 sleepDelta {};

            do
            {
                if (internalEndTime)
                {
                    if (internalEndTime == AuUInt64(-1))
                    {
                        sleepDelta = INFINITE;
                    }
                    else
                    {
                        auto now = AuTime::SteadyClockMS();
                        if (internalEndTime <= now)
                        {
                            return false;
                        }
                        sleepDelta = internalEndTime - now;
                    }
                }
                else
                {
                    sleepDelta = 0;
                }

                if (this->bIsWinLoop_ &&
                    pMsgWaitForMultipleObjectsEx)
                {
                    // TODO: this might be a symptom of something else 
                    if (!AuSwInfo::IsWindows10OrGreater() && 
                        sleepDelta == INFINITE)

                    {
                    #if 0
                        auto DoTryIf = [&]
                        {
                            temp = ::WaitForMultipleObjectsEx(this->handleArrayOr_.size(), this->handleArrayOr_.data(), false, 4, true);
                            return WaitToRetStatus(temp);
                        };

                        if (!DoTryIf())
                    #endif
                        {
                            temp = pMsgWaitForMultipleObjectsEx(this->handleArrayOr_.size(), this->handleArrayOr_.data(), sleepDelta, QS_ALLPOSTMESSAGE | QS_ALLINPUT | QS_ALLEVENTS, MWMO_INPUTAVAILABLE | MWMO_ALERTABLE);
                        }
                    }
                    else
                    {
                        temp = pMsgWaitForMultipleObjectsEx(this->handleArrayOr_.size(), this->handleArrayOr_.data(), sleepDelta, QS_ALLPOSTMESSAGE | QS_ALLINPUT | QS_ALLEVENTS, MWMO_INPUTAVAILABLE | MWMO_ALERTABLE);
                    }
                }
                else
                {
                    temp = ::WaitForMultipleObjectsEx(this->handleArrayOr_.size(), this->handleArrayOr_.data(), false, sleepDelta, true);
                }

                {
                    auto temp2 = temp;
                    while (temp2 == WAIT_IO_COMPLETION)
                    {
                        temp2 = SleepEx(0, true);
                    }
                }
            } 
            while (temp == WAIT_IO_COMPLETION);

            status = WaitToRetStatus(temp);

            if (status)
            {
                indexOfTriggered = temp - WAIT_OBJECT_0;
            }
        }

        bool bIsPump = this->handleArrayOr_.size() == indexOfTriggered;

        if (bIsPump)
        {
            if (poll)
            {
                this->bIOUWin32FastPath = true;
                return true;
            }
            else if (TryPumpWin32())
            {
                triggeredCount++;
                bTriggerWin32 = true;
            }
            return triggeredCount;
        }
        else if (!status)
        {
            if (!StartUserAndTakeOwn())
            {
                return false;
            }

            ConsiderEvicitingTimeoutsAll();
            bFinished = true;
            StartUserAndTakeOwn_Release();
            return false;
        }
        else
        {
            static Aurora::Utility::RateLimiter limit(AuMSToNS<AuUInt64>(24));

            if (limit.CheckExchangePass())
            {
                if (!poll && TryPumpWin32())
                {
                    triggeredCount++;
                    bTriggerWin32 = true;
                }
            }
        }

        if (!StartUserAndTakeOwn())
        {
            bFinished = true;
            StartUserAndTakeOwn_Release();
            return true;
        }

        AuUInt firstTriggered { reinterpret_cast<AuUInt>(this->handleArrayOr_[indexOfTriggered])  };
        {
            {
                Iterator queueIterator(this);
                AuSInt indexOffset {};
                auto now = AuTime::SteadyClockMS();
                for (queueIterator.Start(); queueIterator.End() != queueIterator.itr; )
                {
                    bool shouldRemove {false};
                    auto &source = *queueIterator.itr;

                    AuUInt lastHandle {};
                    bool wasTriggered {};

                    if (source.source)
                    {
                        bool singular = source.source->Singular();
                        bool bPollTriggered = this->handleArrayOr_[queueIterator.startingIndexOr] == this->hDummy_;

                        bool bAltTrigger {};

                        if (!bPollTriggered)
                        {
                            if (!singular)
                            {
                                for (const auto &handle : source.source->GetHandles())
                                {
                                    if ((firstTriggered == handle) ||
                                        (bAltTrigger = source.source->IsSignaledNoSpinIfUserland()))
                                    {
                                        lastHandle = handle;
                                        wasTriggered = !bAltTrigger;
                                        break;
                                    }
                                }
                            }
                            else
                            {
                                auto handle = source.source->GetHandle();
                                if ((firstTriggered == handle) ||
                                     (bAltTrigger = source.source->IsSignaledNoSpinIfUserland()))
                                {
                                    lastHandle = firstTriggered;
                                    wasTriggered = !bAltTrigger;
                                }
                            }
                        }

                        if (bPollTriggered || (bAltTrigger) || (wasTriggered && source.source->OnTrigger(lastHandle)))
                        {
                            bool failing {};

                            if (!lastHandle)
                            {
                                lastHandle = (AuUInt)this->handleArrayAnd_[queueIterator.startingIndexAnd];
                            }

                            if (poll)
                            {
                                if (!bPollTriggered)
                                {
                                    failing = !AuTryInsert(this->handleArrayTainted_, AuMakeTuple(queueIterator.startingIndexAnd, 1, reinterpret_cast<HANDLE>(lastHandle)));

                                    if (!failing)
                                    {
                                        triggeredCount++;

                                        this->handleArrayAnd_[queueIterator.startingIndexAnd ] = reinterpret_cast<HANDLE>(this->hDummy_);
                                        this->handleArrayOr_[queueIterator.startingIndexOr ] = reinterpret_cast<HANDLE>(this->hDummy_);
                                    }
                                }
                                else
                                {
                                    triggeredCount++;
                                }
                            }

                            if (!poll)
                            {
                                if (this->handleArrayTainted_.size() &&
                                    bPollTriggered)
                                {
                                    AuTuple<int, int, HANDLE> ref;

                                    bool matched = AuRemoveIf(this->handleArrayTainted_, [&](const AuTuple<int, int, HANDLE> &in) -> bool
                                    {
                                        bool bMatched = queueIterator.startingIndexAnd == AuGet<0>(in);
                                        if (!bMatched)
                                        {
                                            return false;
                                        }

                                        ref = in;
                                        return true;
                                    });

                                    if (matched)
                                    {
                                        if (AuGet<1>(ref) == 1)
                                        {
                                            auto handle = AuGet<2>(ref);
                                            this->handleArrayOr_[queueIterator.startingIndexOr] = handle;
                                            this->handleArrayAnd_[queueIterator.startingIndexAnd] = handle;
                                        }
                                    }
                                }
                            }

                            if (!poll || failing)
                            {
                                triggeredCount++;
                                shouldRemove = true;

                                auto [ticked, bShouldRemove] = source.DoWork(this, -1);
                                shouldRemove = bShouldRemove;

                                if (trigger)
                                {
                                    AuTryInsert(*trigger, source.source);
                                }
                            }
                        }
                    }

                    if (shouldRemove)
                    {
                        AuStaticCast<ILoopSourceEx>(source.source)->OnFinishSleep();

                        if (source.source->GetType() == ELoopSource::eSourceWin32)
                        {
                            SysPanic("?");
                        }
                        else
                        {
                            AuUInt uHandles = (source.source->Singular() ? 1 : source.source->GetHandles().size());
                            int sOffset = -(uHandles);
                            if (this->handleArrayOr_.size() > MAXIMUM_WAIT_OBJECTS)
                            {
                                this->RemoveSourceNB(source.source);
                                this->willCommitInFuture_ = true;
                            }
                            else
                            {
                                AuRemoveRange(this->handleArrayOr_, queueIterator.startingIndexOr + indexOffset, uHandles);
                                AuRemoveRange(this->handleArrayAnd_, queueIterator.startingIndexAnd + indexOffset, uHandles);
                                queueIterator.Delete(this->loopSourceExs_.erase(queueIterator.itr));
                                continue;
                            }
                        }
                    }
                    //else
                    {
                        queueIterator.Next();
                    }
                }
            }

        }

        bFinished = true;
        StartUserAndTakeOwn_Release();

        return triggeredCount;
    }

    bool LoopQueue::StartUserAndTakeOwn()
    {
        if (AuAtomicAdd(&this->uNestedWriteLock_, 1u) > 1)
        {
            return false;
        }

        if (!this->rwMutex_->UpgradeReadToWrite(100))
        {
            return false;
        }
        
        this->isCommitableInFuture_ = true;
        return true;
    }

    bool LoopQueue::TryPumpWin32()
    {
        bool bMsgPump {};
        
        if (!this->msgSource_)
        {
            return false;
        }

        if (pPeekMessageW &&
            pTranslateMessage &&
            pDispatchMessageW)
        {
            MSG msg;

            if (AuStaticCast<Win32Dummy>(this->msgSource_)->bIsPumping_)
            {
                try
                {
                    while (pPeekMessageW(&msg, NULL, 0, 0, PM_REMOVE))
                    {
                        pTranslateMessage(&msg);
                        pDispatchMessageW(&msg);
                        bMsgPump = true;
                    }
                }
                catch (...)
                {
                    SysPushErrorCatch("Win32 Pump <-> Aur LoopQueue. Window handler threw a C++ exception.");
                }
            }
            else
            {
                if (pPeekMessageW(&msg, NULL, 0, 0, PM_NOREMOVE))
                {
                    bMsgPump = true;
                }
            }
        }

        // Notify all and remove if unwanted
        if (bMsgPump)
        {
            AU_LOCK_GUARD(this->sourceMutex_);

            bool bShouldRemove = true;
            for (const auto &handler : this->msgCallbacks_.base)
            {
                try
                {
                    AU_DEBUG_REVERSE_MEMCRUNCH;

                    bShouldRemove &= handler->OnFinished(this->msgSource_);
                }
                catch (...)
                {
                    SysPushErrorCatch();
                }
            }

            AuUInt i {};
            for (const auto &handler : this->msgCallbacks_.extended)
            {
                try
                {
                    AU_DEBUG_REVERSE_MEMCRUNCH;

                    bShouldRemove &= handler->OnFinished(this->msgSource_, i++);
                }
                catch (...)
                {
                    SysPushErrorCatch();
                }
            }

            for (const auto &handler : this->globalSubcribers_)
            {
                try
                {
                    AU_DEBUG_REVERSE_MEMCRUNCH;

                    bShouldRemove &= handler->OnFinished(this->msgSource_);
                }
                catch (...)
                {
                    SysPushErrorCatch();
                }
            }

            if (bShouldRemove)
            {
                this->bIsWinLoop_ = false;
            }
        }

        return bMsgPump;
    }

    void LoopQueue::StartUserAndTakeOwn_Release()
    {
        this->isCommitableInFuture_ = false;
        
        for (const auto &source : this->loopSourceExs_)
        {
            source.source->OnFinishSleep();
        }

        if (this->willCommitInFuture_)
        {
            this->CommitLocked();
        }

        if (AuAtomicSub(&this->uNestedWriteLock_, 1u) == 0)
        {
            this->rwMutex_->DowngradeWriteToRead();
        }
    }

    // callee must own handle array
    void LoopQueue::ConsiderEvicitingTimeoutsAll()
    {
        Iterator queueIterator(this);
        bool bRebuildFromAnd {};

        auto now = AuTime::SteadyClockMS();
        for (queueIterator.Start(); queueIterator.End() != queueIterator.itr; )
        {
            auto &source = *queueIterator.itr;
            if (!source.ConsiderTimeout(now))
            {
                queueIterator.Next();
                continue;
            }

            source.source->OnFinishSleep();

            if (source.source->GetType() == ELoopSource::eSourceWin32)
            {
                // Null message loop hack
                this->msgSource_.reset();
                this->msgCallbacks_ = {};
                this->bIsWinLoop_ = false;
            }
            else
            {
                auto count = source.source->Singular() ? 1 : source.source->GetHandles().size();

                if (this->handleArrayOr_.size() <= MAXIMUM_WAIT_OBJECTS)
                {
                    AuRemoveRange(this->handleArrayOr_, queueIterator.startingIndexOr, count);
                    AuRemoveRange(this->handleArrayAnd_, queueIterator.startingIndexAnd, count);
                }
                else
                {
                    bRebuildFromAnd = true;
                    AuRemoveRange(this->handleArrayAnd_, queueIterator.startingIndexAnd, count);
                }

                queueIterator.Delete(this->loopSourceExs_.erase(queueIterator.itr));
                continue;
            }

            queueIterator.Next();
        }

        if (bRebuildFromAnd)
        {
            BuildFromAndArray();
        }
    }

    bool LoopQueue::AddHook(const AuFunction<void()> &func)
    {
        return AuTryInsert(this->epilogueHooks_, func);
    }

    void LoopQueue::PumpHooks()
    {
        AU_DEBUG_MEMCRUNCH;

        auto c = AuExchange(this->epilogueHooks_, {});
        for (auto &a : c)
        {
            a();
        }
    }

    AUKN_SYM AuSPtr<ILoopQueue> NewLoopQueue()
    {
        SysCheckRetExpNotNullMemory(AuMakeShared<LoopQueue>(), {});
    }
}