/*
 * PROJECT:     ReactOS msctfime.ime
 * LICENSE:     LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
 * PURPOSE:     Supporting IME interface of Text Input Processors (TIPs)
 * COPYRIGHT:   Copyright 2023 Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
 */

#include "msctfime.h"
#include <ndk/ldrfuncs.h> /* for RtlDllShutdownInProgress */

WINE_DEFAULT_DEBUG_CHANNEL(msctfime);

typedef CicArray<GUID> CDispAttrPropCache;

HINSTANCE g_hInst = NULL; /* The instance of this module */
BOOL g_bWinLogon = FALSE;
UINT g_uACP = CP_ACP;
DWORD g_dwOSInfo = 0;
BOOL gfTFInitLib = FALSE;
CRITICAL_SECTION g_csLock;
CDispAttrPropCache *g_pPropCache = NULL;

EXTERN_C void __cxa_pure_virtual(void)
{
    ERR("__cxa_pure_virtual\n");
}

typedef BOOLEAN (WINAPI *FN_DllShutdownInProgress)(VOID);

/// This function calls ntdll!RtlDllShutdownInProgress.
/// It can detect the system is shutting down or not.
/// @implemented
EXTERN_C BOOLEAN WINAPI DllShutdownInProgress(VOID)
{
    HMODULE hNTDLL;
    static FN_DllShutdownInProgress s_fnDllShutdownInProgress = NULL;

    if (s_fnDllShutdownInProgress)
        return s_fnDllShutdownInProgress();

    hNTDLL = cicGetSystemModuleHandle(L"ntdll.dll", FALSE);
    s_fnDllShutdownInProgress =
        (FN_DllShutdownInProgress)GetProcAddress(hNTDLL, "RtlDllShutdownInProgress");
    if (!s_fnDllShutdownInProgress)
        return FALSE;

    return s_fnDllShutdownInProgress();
}

/// This function checks if the current user logon session is interactive.
/// @implemented
static BOOL
IsInteractiveUserLogon(VOID)
{
    BOOL bOK, IsMember = FALSE;
    PSID pSid;
    SID_IDENTIFIER_AUTHORITY IdentAuth = { SECURITY_NT_AUTHORITY };

    if (!AllocateAndInitializeSid(&IdentAuth, 1, SECURITY_INTERACTIVE_RID,
                                  0, 0, 0, 0, 0, 0, 0, &pSid))
    {
        ERR("Error: %ld\n", GetLastError());
        return FALSE;
    }

    bOK = CheckTokenMembership(NULL, pSid, &IsMember);

    if (pSid)
        FreeSid(pSid);

    return bOK && IsMember;
}

/// @implemented
ITfCategoryMgr *GetUIMCat(PCIC_LIBTHREAD pLibThread)
{
    if (!pLibThread)
        return NULL;

    if (pLibThread->m_pCategoryMgr)
        return pLibThread->m_pCategoryMgr;

    if (FAILED(cicCoCreateInstance(CLSID_TF_CategoryMgr, NULL, CLSCTX_INPROC_SERVER,
                                   IID_ITfCategoryMgr, (void **)&pLibThread->m_pCategoryMgr)))
    {
        return NULL;
    }
    return pLibThread->m_pCategoryMgr;
}

/// @implemented
HRESULT LibEnumItemsInCategory(PCIC_LIBTHREAD pLibThread, REFGUID rguid, IEnumGUID **ppEnum)
{
    ITfCategoryMgr *pCat = GetUIMCat(pLibThread);
    if (!pCat)
        return E_FAIL;
    return pCat->EnumItemsInCategory(rguid, ppEnum);
}

/// @implemented
HRESULT InitDisplayAttrbuteLib(PCIC_LIBTHREAD pLibThread)
{
    if (!pLibThread)
        return E_FAIL;

    if (pLibThread->m_pDisplayAttrMgr)
    {
        pLibThread->m_pDisplayAttrMgr->Release();
        pLibThread->m_pDisplayAttrMgr = NULL;
    }

    if (FAILED(cicCoCreateInstance(CLSID_TF_DisplayAttributeMgr, NULL, CLSCTX_INPROC_SERVER,
                                   IID_ITfDisplayAttributeMgr,
                                   (void **)&pLibThread->m_pDisplayAttrMgr)))
    {
        return E_FAIL;
    }

    IEnumGUID *pEnumGuid;
    LibEnumItemsInCategory(pLibThread, GUID_TFCAT_DISPLAYATTRIBUTEPROPERTY, &pEnumGuid);

    HRESULT hr = E_OUTOFMEMORY;

    ::EnterCriticalSection(&g_csLock);
    if (pEnumGuid && !g_pPropCache)
    {
        g_pPropCache = new(cicNoThrow) CDispAttrPropCache();
        if (g_pPropCache)
        {
            g_pPropCache->Add(GUID_PROP_ATTRIBUTE);
            GUID guid;
            while (pEnumGuid->Next(1, &guid, NULL) == S_OK)
            {
                if (!IsEqualGUID(guid, GUID_PROP_ATTRIBUTE))
                    g_pPropCache->Add(guid);
            }
            hr = S_OK;
        }
    }
    ::LeaveCriticalSection(&g_csLock);

    return hr;
}

HIMC GetActiveContext(VOID)
{
    HWND hwndFocus = ::GetFocus();
    if (!hwndFocus)
        hwndFocus = ::GetActiveWindow();
    return ::ImmGetContext(hwndFocus);
}

/// @implemented
HRESULT UninitDisplayAttrbuteLib(PCIC_LIBTHREAD pLibThread)
{
    if (!pLibThread)
        return E_FAIL;

    if (pLibThread->m_pDisplayAttrMgr)
    {
        pLibThread->m_pDisplayAttrMgr->Release();
        pLibThread->m_pDisplayAttrMgr = NULL;
    }

    return S_OK;
}

/// Gets the charset from a language ID.
/// @implemented
BYTE GetCharsetFromLangId(_In_ DWORD dwValue)
{
    CHARSETINFO info;
    if (!::TranslateCharsetInfo((DWORD*)(DWORD_PTR)dwValue, &info, TCI_SRCLOCALE))
        return 0;
    return info.ciCharset;
}

/// Selects or unselects the input context.
/// @implemented
HRESULT
InternalSelectEx(
    _In_ HIMC hIMC,
    _In_ BOOL fSelect,
    _In_ LANGID LangID)
{
    CicIMCLock imcLock(hIMC);
    if (!imcLock)
        imcLock.m_hr = E_FAIL;
    if (FAILED(imcLock.m_hr))
        return imcLock.m_hr;

    if (PRIMARYLANGID(LangID) == LANG_CHINESE)
    {
        imcLock.get().cfCandForm[0].dwStyle = 0;
        imcLock.get().cfCandForm[0].dwIndex = (DWORD)-1;
    }

    if (!fSelect)
    {
        imcLock.get().fdwInit &= ~INIT_GUIDMAP;
        return imcLock.m_hr;
    }

    if (!imcLock.ClearCand())
        return imcLock.m_hr;

    // Populate conversion mode
    if (!(imcLock.get().fdwInit & INIT_CONVERSION))
    {
        DWORD dwConv = (imcLock.get().fdwConversion & IME_CMODE_SOFTKBD);
        if (LangID)
        {
            if (PRIMARYLANGID(LangID) == LANG_JAPANESE)
            {
                dwConv |= IME_CMODE_ROMAN | IME_CMODE_FULLSHAPE | IME_CMODE_NATIVE;
            }
            else if (PRIMARYLANGID(LangID) != LANG_KOREAN)
            {
                dwConv |= IME_CMODE_NATIVE;
            }
        }
        imcLock.get().fdwConversion |= dwConv;
        imcLock.get().fdwInit |= INIT_CONVERSION;
    }

    // Populate sentence mode
    imcLock.get().fdwSentence |= IME_SMODE_PHRASEPREDICT;

    // Populate LOGFONT
    if (!(imcLock.get().fdwInit & INIT_LOGFONT))
    {
        // Get logical font
        LOGFONTW lf;
        HDC hDC = ::GetDC(imcLock.get().hWnd);
        HGDIOBJ hFont = GetCurrentObject(hDC, OBJ_FONT);
        ::GetObjectW(hFont, sizeof(LOGFONTW), &lf);
        ::ReleaseDC(imcLock.get().hWnd, hDC);

        imcLock.get().lfFont.W = lf;
        imcLock.get().fdwInit |= INIT_LOGFONT;
    }
    imcLock.get().lfFont.W.lfCharSet = GetCharsetFromLangId(LangID);

    imcLock.InitContext();

    return imcLock.m_hr;
}

class TLS;

/***********************************************************************
 *      ImeInquire (MSCTFIME.@)
 *
 * MSCTFIME's ImeInquire does nothing.
 *
 * @implemented
 * @see CtfImeInquireExW
 */
EXTERN_C
BOOL WINAPI
ImeInquire(
    _Out_ LPIMEINFO lpIMEInfo,
    _Out_ LPWSTR lpszWndClass,
    _In_ DWORD dwSystemInfoFlags)
{
    TRACE("(%p, %p, 0x%lX)\n", lpIMEInfo, lpszWndClass, dwSystemInfoFlags);
    return FALSE;
}

/***********************************************************************
 *      ImeConversionList (MSCTFIME.@)
 *
 * MSCTFIME's ImeConversionList does nothing.
 *
 * @implemented
 * @see ImmGetConversionListW
 */
EXTERN_C DWORD WINAPI
ImeConversionList(
    _In_ HIMC hIMC,
    _In_ LPCWSTR lpSrc,
    _Out_ LPCANDIDATELIST lpDst,
    _In_ DWORD dwBufLen,
    _In_ UINT uFlag)
{
    TRACE("(%p, %s, %p, 0x%lX, %u)\n", hIMC, debugstr_w(lpSrc), lpDst, dwBufLen, uFlag);
    return 0;
}

/***********************************************************************
 *      ImeRegisterWord (MSCTFIME.@)
 *
 * MSCTFIME's ImeRegisterWord does nothing.
 *
 * @implemented
 * @see ImeUnregisterWord
 */
EXTERN_C BOOL WINAPI
ImeRegisterWord(
    _In_ LPCWSTR lpszReading,
    _In_ DWORD dwStyle,
    _In_ LPCWSTR lpszString)
{
    TRACE("(%s, 0x%lX, %s)\n", debugstr_w(lpszReading), dwStyle, debugstr_w(lpszString));
    return FALSE;
}

/***********************************************************************
 *      ImeUnregisterWord (MSCTFIME.@)
 *
 * MSCTFIME's ImeUnregisterWord does nothing.
 *
 * @implemented
 * @see ImeRegisterWord
 */
EXTERN_C BOOL WINAPI
ImeUnregisterWord(
    _In_ LPCWSTR lpszReading,
    _In_ DWORD dwStyle,
    _In_ LPCWSTR lpszString)
{
    TRACE("(%s, 0x%lX, %s)\n", debugstr_w(lpszReading), dwStyle, debugstr_w(lpszString));
    return FALSE;
}

/***********************************************************************
 *      ImeGetRegisterWordStyle (MSCTFIME.@)
 *
 * MSCTFIME's ImeGetRegisterWordStyle does nothing.
 *
 * @implemented
 * @see ImeRegisterWord
 */
EXTERN_C UINT WINAPI
ImeGetRegisterWordStyle(
    _In_ UINT nItem,
    _Out_ LPSTYLEBUFW lpStyleBuf)
{
    TRACE("(%u, %p)\n", nItem, lpStyleBuf);
    return 0;
}

/***********************************************************************
 *      ImeEnumRegisterWord (MSCTFIME.@)
 *
 * MSCTFIME's ImeEnumRegisterWord does nothing.
 *
 * @implemented
 * @see ImeRegisterWord
 */
EXTERN_C UINT WINAPI
ImeEnumRegisterWord(
    _In_ REGISTERWORDENUMPROCW lpfnEnumProc,
    _In_opt_ LPCWSTR lpszReading,
    _In_ DWORD dwStyle,
    _In_opt_ LPCWSTR lpszString,
    _In_opt_ LPVOID lpData)
{
    TRACE("(%p, %s, %lu, %s, %p)\n", lpfnEnumProc, debugstr_w(lpszReading),
          dwStyle, debugstr_w(lpszString), lpData);
    return 0;
}

EXTERN_C BOOL WINAPI
ImeConfigure(
    _In_ HKL hKL,
    _In_ HWND hWnd,
    _In_ DWORD dwMode,
    _Inout_opt_ LPVOID lpData)
{
    TRACE("(%p, %p, %lu, %p)\n", hKL, hWnd, dwMode, lpData);

    TLS *pTLS = TLS::GetTLS();
    if (!pTLS || !pTLS->m_pBridge || !pTLS->m_pThreadMgr)
        return FALSE;

    CicBridge *pBridge = pTLS->m_pBridge;
    ITfThreadMgr *pThreadMgr = pTLS->m_pThreadMgr;

    if (dwMode & 1)
        return (pBridge->ConfigureGeneral(pTLS, pThreadMgr, hKL, hWnd) == S_OK);

    if (dwMode & 2)
        return (pBridge->ConfigureRegisterWord(pTLS, pThreadMgr, hKL, hWnd, lpData) == S_OK);

    return FALSE;
}

/***********************************************************************
 *      ImeDestroy (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C BOOL WINAPI
ImeDestroy(
    _In_ UINT uReserved)
{
    TRACE("(%u)\n", uReserved);

    TLS *pTLS = TLS::PeekTLS();
    if (pTLS)
        return FALSE;

    if (!pTLS->m_pBridge || !pTLS->m_pThreadMgr)
        return FALSE;

    if (pTLS->m_dwSystemInfoFlags & IME_SYSINFO_WINLOGON)
        return TRUE;

    if (pTLS->m_pBridge->DeactivateIMMX(pTLS, pTLS->m_pThreadMgr) != S_OK)
        return FALSE;

    return pTLS->m_pBridge->UnInitIMMX(pTLS);
}

/***********************************************************************
 *      ImeEscape (MSCTFIME.@)
 *
 * MSCTFIME's ImeEscape does nothing.
 *
 * @implemented
 * @see CtfImeEscapeEx
 */
EXTERN_C LRESULT WINAPI
ImeEscape(
    _In_ HIMC hIMC,
    _In_ UINT uEscape,
    _Inout_opt_ LPVOID lpData)
{
    TRACE("(%p, %u, %p)\n", hIMC, uEscape, lpData);
    return 0;
}

EXTERN_C BOOL WINAPI
ImeProcessKey(
    _In_ HIMC hIMC,
    _In_ UINT uVirKey,
    _In_ LPARAM lParam,
    _In_ CONST LPBYTE lpbKeyState)
{
    FIXME("stub:(%p, %u, %p, lpbKeyState)\n", hIMC, uVirKey, lParam, lpbKeyState);
    return FALSE;
}

/***********************************************************************
 *      ImeSelect (MSCTFIME.@)
 *
 * MSCTFIME's ImeSelect does nothing.
 *
 * @implemented
 * @see CtfImeSelectEx
 */
EXTERN_C BOOL WINAPI
ImeSelect(
    _In_ HIMC hIMC,
    _In_ BOOL fSelect)
{
    TRACE("(%p, %u)\n", hIMC, fSelect);
    return FALSE;
}

/***********************************************************************
 *      ImeSetActiveContext (MSCTFIME.@)
 *
 * MSCTFIME's ImeSetActiveContext does nothing.
 *
 * @implemented
 * @see CtfImeSetActiveContextAlways
 */
EXTERN_C BOOL WINAPI
ImeSetActiveContext(
    _In_ HIMC hIMC,
    _In_ BOOL fFlag)
{
    TRACE("(%p, %u)\n", hIMC, fFlag);
    return FALSE;
}

EXTERN_C UINT WINAPI
ImeToAsciiEx(
    _In_ UINT uVirKey,
    _In_ UINT uScanCode,
    _In_ CONST LPBYTE lpbKeyState,
    _Out_ LPTRANSMSGLIST lpTransMsgList,
    _In_ UINT fuState,
    _In_ HIMC hIMC)
{
    FIXME("stub:(%u, %u, %p, %p, %u, %p)\n", uVirKey, uScanCode, lpbKeyState, lpTransMsgList,
          fuState, hIMC);
    return 0;
}

EXTERN_C BOOL WINAPI
NotifyIME(
    _In_ HIMC hIMC,
    _In_ DWORD dwAction,
    _In_ DWORD dwIndex,
    _In_ DWORD_PTR dwValue)
{
    FIXME("stub:(%p, 0x%lX, 0x%lX, %p)\n", hIMC, dwAction, dwIndex, dwValue);
    return FALSE;
}

EXTERN_C BOOL WINAPI
ImeSetCompositionString(
    _In_ HIMC hIMC,
    _In_ DWORD dwIndex,
    _In_opt_ LPCVOID lpComp,
    _In_ DWORD dwCompLen,
    _In_opt_ LPCVOID lpRead,
    _In_ DWORD dwReadLen)
{
    FIXME("stub:(%p, 0x%lX, %p, 0x%lX, %p, 0x%lX)\n", hIMC, dwIndex, lpComp, dwCompLen,
          lpRead, dwReadLen);
    return FALSE;
}

EXTERN_C DWORD WINAPI
ImeGetImeMenuItems(
    _In_ HIMC hIMC,
    _In_ DWORD dwFlags,
    _In_ DWORD dwType,
    _Inout_opt_ LPIMEMENUITEMINFOW lpImeParentMenu,
    _Inout_opt_ LPIMEMENUITEMINFOW lpImeMenu,
    _In_ DWORD dwSize)
{
    FIXME("stub:(%p, 0x%lX, 0x%lX, %p, %p, 0x%lX)\n", hIMC, dwFlags, dwType, lpImeParentMenu,
          lpImeMenu, dwSize);
    return 0;
}

/***********************************************************************
 *      CtfImeInquireExW (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C HRESULT WINAPI
CtfImeInquireExW(
    _Out_ LPIMEINFO lpIMEInfo,
    _Out_ LPWSTR lpszWndClass,
    _In_ DWORD dwSystemInfoFlags,
    _In_ HKL hKL)
{
    TRACE("(%p, %p, 0x%lX, %p)\n", lpIMEInfo, lpszWndClass, dwSystemInfoFlags, hKL);

    TLS *pTLS = TLS::GetTLS();
    if (!pTLS)
        return E_OUTOFMEMORY;

    if (!IsInteractiveUserLogon())
    {
        dwSystemInfoFlags |= IME_SYSINFO_WINLOGON;
        g_bWinLogon = TRUE;
    }

    pTLS->m_dwSystemInfoFlags = dwSystemInfoFlags;

    return Inquire(lpIMEInfo, lpszWndClass, dwSystemInfoFlags, hKL);
}

/***********************************************************************
 *      CtfImeSelectEx (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C BOOL WINAPI
CtfImeSelectEx(
    _In_ HIMC hIMC,
    _In_ BOOL fSelect,
    _In_ HKL hKL)
{
    TRACE("(%p, %d, %p)\n", hIMC, fSelect, hKL);

    TLS *pTLS = TLS::PeekTLS();
    if (!pTLS)
        return E_OUTOFMEMORY;

    InternalSelectEx(hIMC, fSelect, LOWORD(hKL));

    if (!pTLS->m_pBridge || !pTLS->m_pThreadMgr)
        return E_OUTOFMEMORY;

    return pTLS->m_pBridge->SelectEx(pTLS, pTLS->m_pThreadMgr, hIMC, fSelect, hKL);
}

EXTERN_C LRESULT WINAPI
CtfImeEscapeEx(
    _In_ HIMC hIMC,
    _In_ UINT uSubFunc,
    _Inout_opt_ LPVOID lpData,
    _In_ HKL hKL)
{
    FIXME("stub:(%p, %u, %p, %p)\n", hIMC, uSubFunc, lpData, hKL);
    return 0;
}

/***********************************************************************
 *      CtfImeGetGuidAtom (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C HRESULT WINAPI
CtfImeGetGuidAtom(
    _In_ HIMC hIMC,
    _In_ DWORD dwUnknown,
    _Out_opt_ LPDWORD pdwGuidAtom)
{
    TRACE("(%p, 0x%lX, %p)\n", hIMC, dwUnknown, pdwGuidAtom);

    CicIMCLock imcLock(hIMC);

    HRESULT hr = imcLock.m_hr;
    if (!imcLock)
        hr = E_FAIL;
    if (FAILED(hr))
        return hr;

    CicIMCCLock<CTFIMECONTEXT> imccLock(imcLock.get().hCtfImeContext);
    hr = imccLock.m_hr;
    if (!imccLock)
        hr = E_FAIL;
    if (FAILED(hr))
        return hr;

    if (!imccLock.get().m_pCicIC)
        return E_OUTOFMEMORY;

    hr = imccLock.get().m_pCicIC->GetGuidAtom(imcLock, dwUnknown, pdwGuidAtom);
    return hr;
}

/***********************************************************************
 *      CtfImeIsGuidMapEnable (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C BOOL WINAPI
CtfImeIsGuidMapEnable(
    _In_ HIMC hIMC)
{
    TRACE("(%p)\n", hIMC);

    BOOL ret = FALSE;
    HRESULT hr;
    CicIMCLock imcLock(hIMC);

    hr = imcLock.m_hr;
    if (!imcLock)
        hr = E_FAIL;
    if (SUCCEEDED(hr))
        ret = !!(imcLock.get().fdwInit & INIT_GUIDMAP);

    return ret;
}

/***********************************************************************
 *      CtfImeCreateThreadMgr (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C HRESULT WINAPI
CtfImeCreateThreadMgr(VOID)
{
    TRACE("()\n");

    TLS *pTLS = TLS::GetTLS();
    if (!pTLS)
        return E_OUTOFMEMORY;

    if (!pTLS->m_pBridge)
    {
        pTLS->m_pBridge = new(cicNoThrow) CicBridge();
        if (!pTLS->m_pBridge)
            return E_OUTOFMEMORY;
    }

    HRESULT hr = S_OK;
    if (!g_bWinLogon && !(pTLS->m_dwSystemInfoFlags & IME_SYSINFO_WINLOGON))
    {
        hr = pTLS->m_pBridge->InitIMMX(pTLS);
        if (SUCCEEDED(hr))
        {
            if (!pTLS->m_pThreadMgr)
                return E_OUTOFMEMORY;

            hr = pTLS->m_pBridge->ActivateIMMX(pTLS, pTLS->m_pThreadMgr);
            if (FAILED(hr))
                pTLS->m_pBridge->UnInitIMMX(pTLS);
        }
    }

    return hr;
}


/***********************************************************************
 *      CtfImeDestroyThreadMgr (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C HRESULT WINAPI
CtfImeDestroyThreadMgr(VOID)
{
    TRACE("()\n");

    TLS *pTLS = TLS::PeekTLS();
    if (!pTLS)
        return E_OUTOFMEMORY;

    if (pTLS->m_pBridge)
    {
        pTLS->m_pBridge = new(cicNoThrow) CicBridge();
        if (!pTLS->m_pBridge)
            return E_OUTOFMEMORY;
    }

    if (!pTLS->m_pThreadMgr)
        return E_OUTOFMEMORY;

    if (pTLS->m_dwSystemInfoFlags & IME_SYSINFO_WINLOGON)
        return S_OK;

    HRESULT hr = pTLS->m_pBridge->DeactivateIMMX(pTLS, pTLS->m_pThreadMgr);
    if (hr == S_OK)
        pTLS->m_pBridge->UnInitIMMX(pTLS);

    return hr;
}

EXTERN_C HRESULT WINAPI
CtfImeCreateInputContext(
    _In_ HIMC hIMC)
{
    return E_NOTIMPL;
}

/***********************************************************************
 *      CtfImeDestroyInputContext (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C HRESULT WINAPI
CtfImeDestroyInputContext(
    _In_ HIMC hIMC)
{
    TRACE("(%p)\n", hIMC);

    TLS *pTLS = TLS::PeekTLS();
    if (!pTLS || !pTLS->m_pBridge)
        return E_OUTOFMEMORY;

    return pTLS->m_pBridge->DestroyInputContext(pTLS, hIMC);
}

EXTERN_C HRESULT WINAPI
CtfImeSetActiveContextAlways(
    _In_ HIMC hIMC,
    _In_ BOOL fActive,
    _In_ HWND hWnd,
    _In_ HKL hKL)
{
    FIXME("stub:(%p, %d, %p, %p)\n", hIMC, fActive, hWnd, hKL);
    return E_NOTIMPL;
}


/***********************************************************************
 *      CtfImeProcessCicHotkey (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C HRESULT WINAPI
CtfImeProcessCicHotkey(
    _In_ HIMC hIMC,
    _In_ UINT vKey,
    _In_ LPARAM lParam)
{
    TRACE("(%p, %u, %p)\n", hIMC, vKey, lParam);

    TLS *pTLS = TLS::GetTLS();
    if (!pTLS)
        return S_OK;

    HRESULT hr = S_OK;
    ITfThreadMgr *pThreadMgr = NULL;
    ITfThreadMgr_P *pThreadMgr_P = NULL;
    if ((TF_GetThreadMgr(&pThreadMgr) == S_OK) &&
        (pThreadMgr->QueryInterface(IID_ITfThreadMgr_P, (void**)&pThreadMgr_P) == S_OK) &&
        CtfImmIsCiceroStartedInThread())
    {
        HRESULT hr2;
        if (SUCCEEDED(pThreadMgr_P->CallImm32HotkeyHandler(vKey, lParam, &hr2)))
            hr = hr2;
    }

    if (pThreadMgr)
        pThreadMgr->Release();
    if (pThreadMgr_P)
        pThreadMgr_P->Release();

    return hr;
}

/***********************************************************************
 *      CtfImeDispatchDefImeMessage (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C LRESULT WINAPI
CtfImeDispatchDefImeMessage(
    _In_ HWND hWnd,
    _In_ UINT uMsg,
    _In_ WPARAM wParam,
    _In_ LPARAM lParam)
{
    TRACE("(%p, %u, %p, %p)\n", hWnd, uMsg, wParam, lParam);

    TLS *pTLS = TLS::GetTLS();
    if (pTLS)
    {
        if (uMsg == WM_CREATE)
            ++pTLS->m_cWnds;
        else if (uMsg == WM_DESTROY)
            --pTLS->m_cWnds;
    }

    if (!IsMsImeMessage(uMsg))
        return 0;

    HKL hKL = GetKeyboardLayout(0);
    if (IS_IME_HKL(hKL))
        return 0;

    HWND hImeWnd = (HWND)SendMessageW(hWnd, WM_IME_NOTIFY, 0x17, 0);
    if (!IsWindow(hImeWnd))
        return 0;

    return SendMessageW(hImeWnd, uMsg, wParam, lParam);
}

EXTERN_C BOOL WINAPI
CtfImeIsIME(
    _In_ HKL hKL)
{
    FIXME("stub:(%p)\n", hKL);
    return FALSE;
}

/***********************************************************************
 *      CtfImeThreadDetach (MSCTFIME.@)
 *
 * @implemented
 */
EXTERN_C HRESULT WINAPI
CtfImeThreadDetach(VOID)
{
    ImeDestroy(0);
    return S_OK;
}

/// @implemented
BOOL AttachIME(VOID)
{
    return RegisterImeClass() && RegisterMSIMEMessage();
}

/// @implemented
VOID DetachIME(VOID)
{
    UnregisterImeClass();
}

EXTERN_C VOID TFUninitLib(VOID)
{
    if (g_pPropCache)
    {
        delete g_pPropCache;
        g_pPropCache = NULL;
    }
}

/// @implemented
BOOL ProcessAttach(HINSTANCE hinstDLL)
{
    g_hInst = hinstDLL;

    InitializeCriticalSectionAndSpinCount(&g_csLock, 0);

    if (!TLS::Initialize())
        return FALSE;

    cicGetOSInfo(&g_uACP, &g_dwOSInfo);

    cicInitUIFLib();

    if (!TFInitLib())
        return FALSE;

    gfTFInitLib = TRUE;
    return AttachIME();
}

/// @implemented
VOID ProcessDetach(HINSTANCE hinstDLL)
{
    TF_DllDetachInOther();

    if (gfTFInitLib)
    {
        DetachIME();
        TFUninitLib();
    }

    DeleteCriticalSection(&g_csLock);
    TLS::InternalDestroyTLS();
    TLS::Uninitialize();
    cicDoneUIFLib();
}

/// @implemented
EXTERN_C BOOL WINAPI
DllMain(
    _In_ HINSTANCE hinstDLL,
    _In_ DWORD dwReason,
    _Inout_opt_ LPVOID lpvReserved)
{
    switch (dwReason)
    {
        case DLL_PROCESS_ATTACH:
        {
            TRACE("(%p, %lu, %p)\n", hinstDLL, dwReason, lpvReserved);
            if (!ProcessAttach(hinstDLL))
            {
                ProcessDetach(hinstDLL);
                return FALSE;
            }
            break;
        }
        case DLL_PROCESS_DETACH:
        {
            ProcessDetach(hinstDLL);
            break;
        }
        case DLL_THREAD_DETACH:
        {
            TF_DllDetachInOther();
            CtfImeThreadDetach();
            TLS::InternalDestroyTLS();
            break;
        }
    }
    return TRUE;
}