#include <windows.h>
#include <iostream>

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch (msg) {
        case WM_POINTERWHEEL: {
            UINT32 pointerId = GET_POINTERID_WPARAM(wParam);
            POINTER_INFO pi;
            if (GetPointerInfo(pointerId, &pi)) {
                int delta = GET_WHEEL_DELTA_WPARAM(wParam);
                std::cout << "WM_POINTERWHEEL: delta=" << delta << std::endl;
            }
            break;
        }

        case WM_DESTROY:
            PostQuitMessage(0);
            break;
    }

    return DefWindowProc(hwnd, msg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int nCmdShow) {
    const wchar_t CLASS_NAME[] = L"MyPointerWheelWindowClass";

    WNDCLASS wc = {};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);

    RegisterClass(&wc);

    HWND hwnd = CreateWindowEx(
        0,
        CLASS_NAME,
        L"Pointer Wheel Test",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 500, 300,
        NULL, NULL, hInstance, NULL
    );

    if (!hwnd) {
        MessageBox(NULL, L"Failed to create window.", L"Error", MB_OK);
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    // Enable pointer input messages (touchpad, stylus, etc.)
    EnableMouseInPointer(TRUE);

    MSG msg = {};
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}