#include <Windows.h>
#include <msctf.h>
#include <Objbase.h>

#include <filesystem>
#include <fstream>
#include <iomanip>

static const GUID TEST_CLSID =
{ 0x7A0C45B1, 0x3E89, 0x4F7B, {0xA1,0x42,0x91,0x87,0x65,0xCC,0x33,0x10} };

static std::filesystem::path logPath()
{
    wchar_t buffer[32768]{};
    DWORD len = GetEnvironmentVariableW(
        L"LOCALAPPDATA",
        buffer,
        static_cast<DWORD>(std::size(buffer))
    );

    if (len > 0 && len < std::size(buffer)) {
        std::filesystem::path dir =
            std::filesystem::path(buffer) / L"MyanglishIME";

        std::error_code ec;
        std::filesystem::create_directories(dir, ec);

        return dir / L"tsf-minimal-probe.log";
    }

    return L"tsf-minimal-probe.log";
}

static void logHr(const wchar_t* name, HRESULT hr)
{
    std::wofstream file(logPath(), std::ios::app);

    file << name
         << L"=0x"
         << std::uppercase
         << std::hex
         << std::setw(8)
         << std::setfill(L'0')
         << static_cast<unsigned long>(hr)
         << L"\n";
}

int wmain()
{
    HRESULT hr = CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
    logHr(L"CoInitializeEx", hr);

    ITfInputProcessorProfiles* profiles = nullptr;

    hr = CoCreateInstance(
        CLSID_TF_InputProcessorProfiles,
        nullptr,
        CLSCTX_INPROC_SERVER,
        IID_ITfInputProcessorProfiles,
        reinterpret_cast<void**>(&profiles)
    );

    logHr(L"CoCreateInstance", hr);

    if (SUCCEEDED(hr)) {
        hr = profiles->Register(TEST_CLSID);
        logHr(L"Register", hr);
        profiles->Release();
    }

    CoUninitialize();

    return FAILED(hr) ? 1 : 0;
}