use core::ptr::null_mut;
use fenestroj::*;

unsafe extern "system" fn callback(
  win: HWND,
  msg: u32,
  wparam: usize,
  lparam: isize,
) -> isize {
  match msg {
    WM_DESTROY => {
      post_quit_message(0);
      0
    }
    _ => default_window_proc(win, msg, wparam, lparam),
  }
}

fn main() {
  const CLASS_NAME: &str = "demo_class";
  unsafe {
    let _class_atom = register_class(WinClass {
      menu_name: "",
      class_name: CLASS_NAME,
      wnd_proc: Some(callback),
      cursor: load_cursor(null_mut(), IDC_ARROW).ok(),
      ..WinClass::default()
    })
    .expect("Couldn't register a class!");

    const WINDOW_STYLE: WindowStyle = WindowStyle(0)
      .with_caption(true)
      .with_border(true)
      .with_sys_menu(true)
      .with_visible(true);
    let _window = create_window_ex(CreateWindowExRequest {
      class_name: CLASS_NAME,
      window_name: "Demo Window",
      x: CW_USEDEFAULT,
      y: CW_USEDEFAULT,
      width: 800,
      height: 600,
      style: WINDOW_STYLE,
      ..CreateWindowExRequest::default()
    })
    .expect("Couldn't create a window!");

    let mut msg = MSG::default();
    // Note: `get_message` blocks until there's a message, and the Ok side of
    // the result is a "should you keep going?" bool.
    while get_message(&mut msg, null_mut(), 0, 0).unwrap() {
      translate_message(&msg);
      dispatch_message(&msg);
    }
  }
}