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

    File: IWorkItem.hpp
    Date: 2021-11-1
    Author: Reece
***/
 #pragma once

namespace Aurora::Async
{
    struct IWorkItem
    {
        virtual AuSPtr<IWorkItem> WaitFor(const AuSPtr<IWorkItem> &workItem)    = 0;
        virtual AuSPtr<IWorkItem> WaitFor(const AuList<AuSPtr<IWorkItem>> &workItem) = 0;
        
        // ms = time relative to the current time
        virtual AuSPtr<IWorkItem> SetSchedTime(AuUInt32 ms)                     = 0;
        
        // ns = Aurora::Time::CurrentClockMS() + relativeMs
        virtual AuSPtr<IWorkItem> SetSchedTimeAbs(AuUInt32 ms)                  = 0;

        // ns = time relative to the current time
        virtual AuSPtr<IWorkItem> SetSchedTimeNs(AuUInt64 ns)                   = 0;

        // ns = Aurora::Time::CurrentClockNS() + relativeNs
        virtual AuSPtr<IWorkItem> SetSchedTimeNsAbs(AuUInt64 ns)                = 0;
        
        // ms = time relative to the time at which the work item would otherwise dispatch
        virtual AuSPtr<IWorkItem> AddDelayTime(AuUInt32 ms)                     = 0;
        
        // ns = time relative to the time at which the work item would otherwise dispatch
        virtual AuSPtr<IWorkItem> AddDelayTimeNs(AuUInt64 ns)                   = 0;

        virtual AuSPtr<IWorkItem> Then(const AuSPtr<IWorkItem> &next)           = 0;

        virtual AuSPtr<IWorkItem> Dispatch()                                    = 0;

        // per work frame, available work is dequed and sorted.
        // work is sorted by prio and then by initial submission index.
        // 
        // prios under .25 will yield for new work at time of possible dispatch 
        // only if there are work entries of > .5 in the pending work queue.
        virtual void SetPrio(float val = 0.5f)                                  = 0;

        virtual bool BlockUntilComplete()                                       = 0;
        virtual bool HasFinished()                                              = 0;
        virtual bool HasFailed()                                                = 0;
        virtual void Cancel()                                                   = 0;

        virtual void *GetPrivateData()                                          = 0;
        virtual AuOptional<void *> ToWorkResultT()                              = 0;
    };
}