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

    File: AuIOHandle.hpp
    Date: 2023-7-28
    Author: Reece
***/
#pragma once

namespace Aurora::IO::IPC
{
    struct IPCPipeImpl;
}

namespace Aurora::IO
{
    struct AFileHandle : IIOHandle
    {
        ~AFileHandle();

        bool InitFromHandle(AuSPtr<IIOHandle> pHandle) override;

        bool InitFromCopy(AuUInt64 uOSHandle) override;

        bool InitFromMove(AuUInt64 uOSHandle) override;

        bool InitFromPair(AuOptionalEx<AuUInt64> uOSReadHandle,
                          AuOptionalEx<AuUInt64> uOSWriteHandle) override;

        bool InitFromPairMove(AuOptionalEx<AuUInt64> uOSReadHandle,
                              AuOptionalEx<AuUInt64> uOSWriteHandle) override;

        bool InitFromStreamEnum(EStandardStream eStream) override;

        bool InitFromSharing(const AuString &handle) override;

        bool InitFromPath(HandleCreate create) override;

        AuUInt64 GetOSHandle() const override;

        AuOptionalEx<AuUInt64> GetOSHandleSafe() const override;

        AuUInt64 GetOSReadHandle() const override;

        AuOptionalEx<AuUInt64> GetOSReadHandleSafe() const override;

        AuUInt64 GetOSWriteHandle() const override;

        AuOptionalEx<AuUInt64> GetOSWriteHandleSafe() const override;

        bool IsValid() const override;

        bool HasUniqueWriteHandle()const  override;

        bool IsAsync() const override;

        AuString GetPath() const override;

        bool IsFile() const override;
        bool IsTTY() const override;
        bool IsPipe() const override;

        bool IsFlushOnClose() const override;
        void SetFlushOnClose(bool bFlushOnClose) override;

        void InitStdIn(bool bSharing = false);
        void InitStdOut(bool bError = false, bool bSharing = false);

        bool SectionLock(AuUInt64 uOffset,
                         AuUInt64 uLength,
                         FS::EFileAdvisoryLockLevel level) override;
        
        bool SectionUnlock(AuUInt64 uOffset,
                           AuUInt64 uLength) override;

        AuString SharingGetString() override;
        bool SharingIsShared() override;
        void SharingStop() override;
        
        AuOptionalEx<AuUInt64> uOSWriteHandle;
        AuOptionalEx<AuUInt64> uOSReadHandle;
        AuSPtr<IIOHandle> pThat;
        bool bIsAsync {}, bFlushOnClose {};
        AuString path;
        IPC::IPCPipeImpl *pIPCPipe {};
        bool bDirectIO {};
        mutable AuOptional<bool> optIsFile;
        mutable AuOptional<bool> optIsPipe;
        mutable AuOptional<bool> optIsTTY;
        mutable AuSPtr<AuString> pIPCString;

    protected:
    // Implement me:

        // bool InitFromPath(HandleCreate create) override;

        static AuUInt64 DupHandle(AuUInt64 uOSHandle, bool bWriteAccess);
        static AuUInt64 DupHandle(AuUInt64 uOSHandle, bool bWriteAccess, bool bShareAccess);
        static void     CloseHandle(AuUInt64 uOSHandle, bool bFlushOnClose);

        inline void CloseHandle(AuUInt64 uOSHandle)
        {
            CloseHandle(uOSHandle, this->bFlushOnClose);
        }
    };
}