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

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

#include "FS/FS.hpp"
#include "FS/FileAdvisory.NT.hpp"
#include <Source/Grug/AuGrug.hpp>

namespace Aurora::IO
{
    AuUInt64 AFileHandle::DupHandle(AuUInt64 uOSHandle, bool bWriteAccess)
    {
        return DupHandle(uOSHandle, bWriteAccess, false);
    }

    AuUInt64 AFileHandle::DupHandle(AuUInt64 uOSHandle, bool bWriteAccess, bool bShareAccess)
    {
        HANDLE hTargetHandle = (HANDLE)uOSHandle;
        HANDLE hTargetProcess = ::GetCurrentProcess();
        HANDLE hHandle {};

        if (!::DuplicateHandle(hTargetProcess,
                               hTargetHandle,
                               hTargetProcess,
                               &hHandle,
                               bWriteAccess ? GENERIC_WRITE | GENERIC_READ : GENERIC_READ,
                               bShareAccess ? TRUE : FALSE,
                               0))
        {
            return 0;
        }

        return AuUInt64(hHandle);
    }

    void AFileHandle::CloseHandle(AuUInt64 uOSHandle, bool bFlushOnClose, bool bWriteEoS)
    {
    #if 0
        HANDLE hHandle = (HANDLE)uOSHandle;
        AuWin32CloseHandle(hHandle);
    #else
        Grug::CloseHandle(uOSHandle, bFlushOnClose, bWriteEoS);
    #endif
    }

    void AFileHandle::InitStdIn(bool bSharing)
    {
        HANDLE hHandle =
    #if defined(AURORA_PLATFORM_WIN32)
            GetStdHandle(STD_INPUT_HANDLE);
    #else
            Win32Open(L"CONIN$",
                      GENERIC_READ,
                      FILE_SHARE_READ,
                      bSharing,
                      OPEN_EXISTING,
                      0,
                      0);
    #endif

        if (hHandle != INVALID_HANDLE_VALUE)
        {
            auto uHandle = AuBuild::kCurrentPlatform == AuBuild::EPlatform::ePlatformWin32 ?
                DupHandle((AuUInt64)hHandle, false, bSharing) :
                (AuUInt64)hHandle;
            this->uOSReadHandle = uHandle;
        }
    }

    void AFileHandle::InitStdOut(bool bError, bool bSharing)
    {
        HANDLE hHandle =
    #if defined(AURORA_PLATFORM_WIN32)
            GetStdHandle(bError ? STD_ERROR_HANDLE : STD_OUTPUT_HANDLE);
    #else
            Win32Open(bError ? L"CONERR$" : L"CONOUT$",
                      GENERIC_READ | GENERIC_WRITE,
                      FILE_SHARE_READ,
                      bSharing,
                      OPEN_EXISTING,
                      0,
                      0);
    #endif

        if (hHandle != INVALID_HANDLE_VALUE)
        {
            auto uHandle = AuBuild::kCurrentPlatform == AuBuild::EPlatform::ePlatformWin32 ?
                DupHandle((AuUInt64)hHandle, true, bSharing) :
                (AuUInt64)hHandle;
            this->uOSWriteHandle = this->uOSReadHandle = uHandle;
        }
    }

    bool AFileHandle::InitFromPath(HandleCreate create)
    {
        HANDLE hFileHandle;

        DWORD dwFlags {};
        DWORD dwAttrs {};
        DWORD dwShare {};

        if (create.path.empty())
        {
            SysPushErrorArg("Cannot open an IO handle to the provided empty path");
            return false;
        }

        if (!FS::EFileOpenModeIsValid(create.eMode))
        {
            SysPushErrorParam("Invalid open mode");
            return false;
        }

        if (!FS::EFileAdvisoryLockLevelIsValid(create.eAdvisoryLevel))
        {
            SysPushErrorParam("Invalid lock mode");
            return false;
        }

        auto pathex = FS::NormalizePathRet(create.path);
        if (pathex.empty())
        {
            SysPushErrorMemory();
            return false;
        }

        auto win32Path = Locale::ConvertFromUTF8(pathex);
        if (win32Path.empty())
        {
            SysPushErrorMemory();
            return false;
        }

        hFileHandle = INVALID_HANDLE_VALUE;

        dwShare = FS::NtLockAdvisoryToShare(create.eAdvisoryLevel);

        if (create.bAsyncHandle)
        {
            dwFlags |= FILE_FLAG_OVERLAPPED;
        }

        if (create.bDirectIOMode)
        {
            dwFlags |= FILE_FLAG_NO_BUFFERING;
            this->bDirectIO = true;
        }
        
        if (!dwFlags)
        {
            dwAttrs |= FILE_ATTRIBUTE_NORMAL;
        }

        for (AU_ITERATE_N(i, 2))
        {
            switch (create.eMode)
            {
            case FS::EFileOpenMode::eRead:
            {
                hFileHandle = Win32Open(win32Path.c_str(),
                                        GENERIC_READ,
                                        dwShare,
                                        false,
                                        OPEN_EXISTING,
                                        dwFlags,
                                        dwAttrs);

                if (hFileHandle != INVALID_HANDLE_VALUE)
                {
                    this->uOSReadHandle = AuUInt64(hFileHandle);
                }

                break;
            }
            case FS::EFileOpenMode::eReadWrite:
            {
                if (create.bAlwaysCreateDirTree)
                {
                    FS::CreateDirectories(pathex, true);
                }

                if (create.bFailIfNonEmptyFile)
                {
                    hFileHandle = Win32Open(win32Path.c_str(),
                                            GENERIC_WRITE | GENERIC_READ | DELETE,
                                            false,
                                            false,
                                            CREATE_NEW,
                                            dwFlags,
                                            dwAttrs);

                    if (hFileHandle == INVALID_HANDLE_VALUE)
                    {
                        if (GetLastError() == ERROR_FILE_EXISTS ||
                            AuFS::FileExists(pathex.c_str()))
                        {
                            SysPushErrorResourceExists("File {} already exists", create.path);
                            return false;
                        }
                    }
                }
                else
                {
                    hFileHandle = Win32Open(win32Path.c_str(),
                                            GENERIC_WRITE | GENERIC_READ | DELETE,
                                            dwShare,
                                            false,
                                            OPEN_EXISTING,
                                            dwFlags,
                                            dwAttrs);

                    if (hFileHandle == INVALID_HANDLE_VALUE)
                    {
                        hFileHandle = Win32Open(win32Path.c_str(),
                                                GENERIC_WRITE | GENERIC_READ | DELETE,
                                                dwShare,
                                                false,
                                                CREATE_NEW,
                                                dwFlags,
                                                dwAttrs);
                    }
                }

                if (hFileHandle != INVALID_HANDLE_VALUE)
                {
                    this->uOSReadHandle = AuUInt64(hFileHandle);
                    this->uOSWriteHandle = AuUInt64(hFileHandle);
                }

                break;
            }
            case FS::EFileOpenMode::eWrite:
            {
                if (create.bAlwaysCreateDirTree)
                {
                    FS::CreateDirectories(pathex, true);
                }

                if (create.bFailIfNonEmptyFile)
                {
                    hFileHandle = Win32Open(win32Path.c_str(),
                                            GENERIC_WRITE | DELETE,
                                            NULL,
                                            false,
                                            CREATE_NEW,
                                            dwFlags,
                                            dwAttrs);

                    if (hFileHandle == INVALID_HANDLE_VALUE)
                    {
                        if (GetLastError() == ERROR_FILE_EXISTS ||
                            AuFS::FileExists(pathex.c_str()))
                        {
                            SysPushErrorResourceExists("File {} already exists", create.path);
                            return false;
                        }
                    }
                }
                else
                {
                    hFileHandle = Win32Open(win32Path.c_str(),
                                            GENERIC_WRITE | FILE_READ_ATTRIBUTES | DELETE,
                                            dwShare,
                                            false,
                                            OPEN_EXISTING,
                                            dwFlags,
                                            dwAttrs);

                    if (hFileHandle == INVALID_HANDLE_VALUE)
                    {
                        hFileHandle = Win32Open(win32Path.c_str(),
                                                GENERIC_WRITE | DELETE,
                                                dwShare,
                                                false,
                                                CREATE_NEW,
                                                dwFlags,
                                                dwAttrs);
                    }
                }

                if (hFileHandle != INVALID_HANDLE_VALUE)
                {
                    this->uOSWriteHandle = AuUInt64(hFileHandle);
                }

                break;
            }
            }

            if (hFileHandle == INVALID_HANDLE_VALUE)
            {
                if (i == 0)
                {
                   RuntimeWaitForSecondaryTick();
                }
                else
                {
                    SysPushErrorIO("Couldn't open: {}", create.path);
                    return false;
                }
            }
            else
            {
                break;
            }
        }

        this->bIsAsync = create.bAsyncHandle;
        this->bShouldWriteEoS = create.bWriteEoSOnClose;
        this->bFlushOnClose = create.bFlushOnClose;

        this->path = create.path;

        return this->IsValid();
    }

    AUKN_SYM bool IsHandleTTY(AuUInt uHandle)
    {
        bool bIsPipe {};
        DWORD dwType {};

        if (!uHandle ||
            uHandle == (AuUInt)INVALID_HANDLE_VALUE)
        {
            SysPushErrorArg();
            return false;
        }

        if (!(dwType = ::GetFileType((HANDLE)uHandle)))
        {
            SysPushErrorGeneric();
            return {};
        }

        return dwType == FILE_TYPE_CHAR;
    }

    AUKN_SYM bool IsHandlePipe(AuUInt uHandle)
    {
        bool bIsPipe {};
        DWORD dwType {};

        if (!uHandle ||
            uHandle == (AuUInt)INVALID_HANDLE_VALUE)
        {
            SysPushErrorArg();
            return false;
        }

        if (!(dwType = ::GetFileType((HANDLE)uHandle)))
        {
            SysPushErrorGeneric();
            return {};
        }

        return dwType == FILE_TYPE_PIPE;
    }

    AUKN_SYM bool IsHandleFile(AuUInt uHandle)
    {
        bool bIsPipe {};
        DWORD dwType {};

        if (!uHandle ||
            uHandle == (AuUInt)INVALID_HANDLE_VALUE)
        {
            SysPushErrorArg();
            return false;
        }

        if (!(dwType = ::GetFileType((HANDLE)uHandle)))
        {
            SysPushErrorGeneric();
            return {};
        }

        return dwType == FILE_TYPE_DISK;
    }
}