/***
    Copyright (C) 2023 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuGroupWorkQueue.cpp
    Date: 2023-11-04
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "AuGroupWorkQueue.hpp"
#include "Async.hpp"
#include "ThreadPool.hpp"
#include "IAsyncRunnable.hpp"

namespace Aurora::Async
{
    void GroupWorkQueue::AddWorkEntry(ThreadState *pState, WorkEntry_t entry)
    {
        AU_DEBUG_MEMCRUNCH;

        auto prio = (int)entry.second->GetPrio();
        SysAssert(prio < AuAsync::kEWorkPriorityCount, "Invalid PRIO");

        AU_LOCK_GUARD(this->mutex);
        this->sortedWork[prio].push_back(entry);

        if (entry.first != kThreadIdAny)
        {
            if (auto pThat = pState->parent.lock()->GetThreadByIndex(entry.first))
            {
                AuAtomicAdd(&pThat->sync.cvHasWork, 1u);
            }
        }
    }

    bool GroupWorkQueue::IsEmpty()
    {
        AU_LOCK_GUARD(this->mutex);
        for (AU_ITERATE_N(i, AuAsync::kEWorkPriorityCount))
        {
            if (this->sortedWork[i].size())
            {
                return false;
            }
        }

        return true;
    }

    bool GroupWorkQueue::IsEmpty(ThreadPool *pPool, AuWorkerId_t id)
    {
    #if 1
        auto pHandle = pPool->GetThreadHandle(id);
        if (!pHandle)
        {
            return false;
        }

        return !AuAtomicLoad(&pHandle->sync.cvHasWork);
    #else
        AU_LOCK_GUARD(this->mutex);

        for (AU_ITERATE_N(i, AuAsync::kEWorkPriorityCount))
        {
            for (const auto &[srcId, pA] : this->sortedWork[i])
            {
                if (id == srcId)
                {
                    return false;
                }
            }
        }

        return true;
    #endif
    }

    void GroupWorkQueue::Dequeue(AuList<WorkEntry_t> &queue, int maxPopCount, AuAsync::ThreadId_t id)
    {
        AU_LOCK_GUARD(this->mutex);

        for (AU_ITERATE_N(i, AuAsync::kEWorkPriorityCount))
        {
            auto &group = this->sortedWork[(int)AuAsync::kEWorkPriorityMaxLegal - i];

            for (auto itr = group.begin(); ((itr != group.end()) && (queue.size() < maxPopCount)); )
            {
                if (itr->first == Async::kThreadIdAny)
                {
                    queue.push_back(*itr);
                    itr = group.erase(itr);
                    continue;
                }

                if ((itr->first != Async::kThreadIdAny) &&
                    (itr->first == id))
                {
                    queue.push_back(*itr);
                    itr = group.erase(itr);
                    continue;
                }

                itr++;
            }

            if (queue.size())
            {
                break;
            }
        }
    }

}