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

    File: AuIPCPipe.Unix.hpp
    Date: 2022-4-14
    Author: Reece
***/
#pragma once

#include <Source/IO/Loop/ILoopSourceEx.hpp>
#include <Source/IO/Loop/LSHandle.hpp>
#include <Source/IO/Loop/LSEvent.hpp>

#if defined(AURORA_IS_LINUX_DERIVED)
    #include <Source/IO/UNIX/IOSubmit.Linux.hpp>
    #include <Source/IO/FS/Async.Linux.hpp>
    #include "AuIPCPrimitives.Linux.hpp"
    #include "AuIPCMutexFutex.Linux.hpp"
#endif

#include "AuIPCMemory.Unix.hpp" // required for handle

namespace Aurora::IO::IPC
{
    struct IPCPipeImpl : IPCPipe, Loop::LSHandle, AuEnableSharedFromThis<IPCPipeImpl>
        #if defined(AURORA_IS_LINUX_DERIVED)
            , IMutexClosedHook
        #endif
    {
        IPCPipeImpl(int (fds)[2], int (secondary)[2], IPCToken readEnd, IPCToken writeEnd, AuSPtr<IPCEvent> event, AuSPtr<IPCMutex> mutex);
        ~IPCPipeImpl();

    #if defined(AURORA_IS_LINUX_DERIVED)
        inline virtual void   OnPresleep() override
        {
            Loop::LSHandle::OnPresleep();
        };
        inline virtual void   OnFinishSleep() override
        {
            Loop::LSHandle:: OnFinishSleep();
        }
        inline virtual AuUInt GetHandle() override
        {
            return Loop::LSHandle:: GetHandle();
        }
        inline bool HasValidHandle()
        {
            return Loop::LSHandle:: HasValidHandle();
        }

    #else
        PROXY_INTERNAL_INTERFACE_(LSHandle::)
    #endif

        virtual AuSPtr<IO::IAsyncTransaction> NewAsyncTransaction() override;

        virtual AuSPtr<Loop::ILoopSource> AsReadChannelIsOpen() override;
        virtual AuSPtr<Loop::ILoopSource> AsReadChannelHasData() override;

        virtual bool Read(const Memory::MemoryViewStreamWrite &write, bool nonblock) override;
        virtual bool Write(const Memory::MemoryViewStreamRead &read) override;
        virtual AuString ExportToString() override;

        bool IsSignaled() override;
        bool WaitOn(AuUInt32 timeout) override;
        Loop::ELoopSource GetType() override;

    #if defined(AURORA_IS_LINUX_DERIVED)
        bool OnClosed() override;
        
        virtual const AuList<AuUInt> &GetHandles() override;
        virtual bool Singular() override;
        virtual bool OnTrigger(AuUInt handle) override;
    #endif
        
        bool LIOS_PopOne();

        void DrainOtherFd();
        AuUInt GetPreemptFd();
        
        bool bIsSendingZero {};

    private:
        int fds[2] {-1, -1};
        int secondary[2] {-1, -1};

        AuSPtr<IO::FS::FileHandle> fsHandle_;
        AuSPtr<IO::FS::LinuxAsyncFileStream> fsStream_;

        void SendTerminateSignal();

        AuList<AuUInt> handles;


        IPCToken readEnd_;
        IPCToken writeEnd_;
        
        AuSPtr<IPCEvent> event_;
        AuSPtr<IPCMutex> mutex_;

        AuLoop::LSEvent  eventPreempt_;

        bool bHasDied {};

        void FinishFinalize();
    };
}