local ffi = package.preload.ffi()

if(ffi.os == "Windows") then

  -- definitions
  ffi.cdef([[
        typedef unsigned int LONG;
        typedef long long LONG_PTR;
        typedef void* PVOID;
        typedef PVOID HANDLE;
        typedef HANDLE HWND;

        HWND GetActiveWindow();
        LONG GetWindowLongPtrA(HWND hWnd, int nIndex);
        LONG SetWindowLongPtrA(HWND hWnd, int nIndex, LONG_PTR dwNewLong);
    ]])

    local GWL_STYLE = -16

    -- styles from https://msdn.microsoft.com/en-us/library/windows/desktop/ms632600(v=vs.85).aspx
    local WS_MAXIMIZEBOX = 0x00010000
    local WS_MINIMIZEBOX = 0x00020000
    local WS_SIZEBOX = 0x00040000

    -- load User32.dll
    local user32 = ffi.load("User32")

    local ptr = user32.GetActiveWindow()
    local value = user32.GetWindowLongPtrA(ptr, GWL_STYLE)
    user32.SetWindowLongPtrA(ptr, GWL_STYLE, bit.band(value, bit.bnot(WS_MAXIMIZEBOX), bit.bnot(WS_SIZEBOX)))
end