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

    File: AuIOHandle.cpp
    Date: 2023-7-28
    Author: Reece
***/
#include <RuntimeInternal.hpp>
#include "AuIOHandle.hpp"

namespace Aurora::IO
{
    AFileHandle::~AFileHandle()
    {
        if (this->uOSWriteHandle.HasValue() && this->uOSReadHandle.HasValue() &&
            this->uOSReadHandle.Value() == this->uOSWriteHandle.Value())
        {
            this->CloseHandle(this->uOSReadHandle.value());
            AuResetMember(this->uOSReadHandle);
            AuResetMember(this->uOSWriteHandle);
        }

        if (this->uOSReadHandle)
        {
            this->CloseHandle(this->uOSReadHandle.value());
            AuResetMember(this->uOSReadHandle);
        }

        if (this->uOSWriteHandle)
        {
            this->CloseHandle(this->uOSWriteHandle.value());
            AuResetMember(this->uOSWriteHandle);
        }
    }

    bool AFileHandle::InitFromHandle(AuSPtr<IIOHandle> pHandle)
    {
        auto pSrc = AuStaticCast<AFileHandle>(pHandle);
        auto pDest = this;

        if (this->IsValid())
        {
            return false;
        }

        pDest->pThat = pHandle;
        pDest->uOSReadHandle = pSrc->uOSReadHandle;
        pDest->uOSWriteHandle = pSrc->uOSWriteHandle;
        pDest->bIsAsync = pSrc->bIsAsync;
        return true;
    }

    bool AFileHandle::InitFromCopy(AuUInt64 uOSHandle)
    {
        if (this->IsValid())
        {
            return false;
        }

        if (auto uOSWriteHandle = this->DupHandle(uOSHandle, true))
        {
            this->uOSReadHandle = uOSWriteHandle;
            this->uOSWriteHandle = uOSWriteHandle;
            return true;
        }
        else
        {
            return {};
        }
    }

    bool AFileHandle::InitFromMove(AuUInt64 uOSHandle)
    {
        if (this->IsValid())
        {
            return false;
        }

        this->uOSReadHandle = uOSHandle;
        this->uOSWriteHandle = uOSHandle;
        return true;
    }
    
    bool AFileHandle::InitFromPair(AuUInt64 uOSReadHandle,
                                   AuUInt64 uOSWriteHandle)
    {
        if (this->IsValid())
        {
            return false;
        }

        if (auto uOSReadHandle2 = this->DupHandle(uOSReadHandle, false))
        {
            this->uOSReadHandle = uOSReadHandle2;
        }
        else
        {
            return {};
        }

        if (auto uOSWriteHandle2 = this->DupHandle(uOSWriteHandle, true))
        {
            this->uOSWriteHandle = uOSWriteHandle2;
        }
        else
        {
            this->CloseHandle(this->uOSReadHandle);
            AuResetMember(this->uOSReadHandle);
            return {};
        }

        return true;
    }

    bool AFileHandle::InitFromPairMove(AuOptionalEx<AuUInt64> uOSReadHandle,
                                       AuOptionalEx<AuUInt64> uOSWriteHandle)
    {
        if (this->IsValid())
        {
            return false;
        }

        this->uOSReadHandle = uOSReadHandle;
        this->uOSWriteHandle = uOSWriteHandle;

        return true;
    }

    bool AFileHandle::InitFromStreamEnum(EStandardStream eStream)
    {
        switch (eStream)
        {
        case EStandardStream::eInputStream:
            this->InitStdIn();
            return this->IsValid();
        case EStandardStream::eErrorStream:
        case EStandardStream::eOutputStream:
            this->InitStdOut(eStream == EStandardStream::eErrorStream);
            return this->IsValid();
        default:
            SysPushErrorArg();
            return false;
        }
    }

    bool AFileHandle::IsFile()
    {
        bool bIsFile {};

        if (auto optFile = this->optIsFile)
        {
            return optFile.value();
        }

        if (auto optHandle = this->GetOSHandleSafe())
        {
            bIsFile = IsHandleFile(optHandle.value());
        }
        else
        {
            SysPushErrorUninitialized();
            return false;
        }

        this->optIsFile = bIsFile;
        return bIsFile;
    }

    bool AFileHandle::IsTTY()
    {
        bool bIsTTY {};

        if (auto optTTY = this->optIsTTY)
        {
            return optTTY.value();
        }

        if (auto optHandle = this->GetOSHandleSafe())
        {
            bIsTTY = IsHandleTTY(optHandle.value());
        }
        else
        {
            SysPushErrorUninitialized();
            return false;
        }

        this->optIsTTY = bIsTTY;
        return bIsTTY;
    }

    bool AFileHandle::IsPipe()
    {
        bool bIsPipe {};

        if (auto optPipe = this->optIsPipe)
        {
            return optPipe.value();
        }

        if (auto optHandle = this->GetOSHandleSafe())
        {
            bIsPipe = IsHandlePipe(optHandle.value());
        }
        else
        {
            SysPushErrorUninitialized();
            return false;
        }

        this->optIsPipe = bIsPipe;
        return bIsPipe;
    }

    AuOptionalEx<AuUInt64> AFileHandle::GetOSHandleSafe()
    {
        if (auto write = this->uOSWriteHandle)
        {
            return write;
        }

        if (auto read = this->uOSReadHandle)
        {
            return read;
        }

        return {};
    }

    AuUInt64 AFileHandle::GetOSHandle()
    {
        return this->uOSReadHandle.ValueOr(this->uOSWriteHandle.Value());
    }

    AuUInt64 AFileHandle::GetOSReadHandle()
    {
        return this->uOSReadHandle.value();
    }

    AuOptionalEx<AuUInt64> AFileHandle::GetOSReadHandleSafe()
    {
        return this->uOSReadHandle;
    }

    AuUInt64 AFileHandle::GetOSWriteHandle()
    {
        return this->uOSWriteHandle.Value();
    }

    AuOptionalEx<AuUInt64> AFileHandle::GetOSWriteHandleSafe()
    {
        return this->uOSWriteHandle;
    }

    bool AFileHandle::IsValid()
    {
        return this->uOSReadHandle.HasValue() || 
            this->uOSWriteHandle.HasValue();
    }

    bool AFileHandle::HasUniqueWriteHandle()
    {
        return this->uOSWriteHandle.HasValue();
    }

    bool AFileHandle::IsAsync()
    {
        return this->bIsAsync;
    }

    AuString AFileHandle::GetPath()
    {
        return this->path;
    }
}