usingnamespace @import("bits.zig");

pub const WNDPROC = fn (HWND, UINT, WPARAM, LPARAM) callconv(.Stdcall) LRESULT;

pub const WNDCLASSEXA = extern struct {
    cbSize: UINT = @sizeOf(WNDCLASSEXA),
    style: UINT,
    lpfnWndProc: WNDPROC,
    cbClsExtra: i32,
    cbWndExtra: i32,
    hInstance: HINSTANCE,
    hIcon: ?HICON,
    hCursor: ?HCURSOR,
    hbrBackground: ?HBRUSH,
    lpszMenuName: ?LPCSTR,
    lpszClassName: LPCSTR,
    hIconSm: ?HICON,
};

pub extern "user32" fn CreateWindowExA(
    dwExStyle: DWORD,
    lpClassName: LPCSTR,
    lpWindowName: LPCSTR,
    dwStyle: DWORD,
    X: i32,
    Y: i32,
    nWidth: i32,
    nHeight: i32,
    hWindParent: ?HWND,
    hMenu: ?HMENU,
    hInstance: HINSTANCE,
    lpParam: ?LPVOID,
) callconv(.Stdcall) ?HWND;

pub extern "user32" fn DefWindowProcA(HWND, Msg: UINT, WPARAM, LPARAM) callconv(.Stdcall) LRESULT;

pub extern "user32" fn RegisterClassExA(*const WNDCLASSEXA) callconv(.Stdcall) c_ushort;