/// from: https://github.com/tauri-apps/tauri/issues/4789, full credit to haasal
#[cfg(target_os = "macos")]
use tauri::{Runtime, Window};

#[cfg(target_os = "macos")]
pub trait WindowExt {
    fn set_transparent_titlebar(&self, transparent: bool);
    fn position_traffic_lights(&self, x: f64, y: f64);
}

#[cfg(target_os = "macos")]
impl<R: Runtime> WindowExt for Window<R> {
    fn set_transparent_titlebar(&self, transparent: bool) {
        use cocoa::appkit::{NSWindow, NSWindowTitleVisibility};

        let window = self.ns_window().unwrap() as cocoa::base::id;

        unsafe {
            window.setTitleVisibility_(
                NSWindowTitleVisibility::NSWindowTitleHidden,
            );

            if transparent {
                window.setTitlebarAppearsTransparent_(cocoa::base::YES);
            } else {
                window.setTitlebarAppearsTransparent_(cocoa::base::NO);
            }
        }
    }

    fn position_traffic_lights(&self, x: f64, y: f64) {
        use cocoa::appkit::{NSView, NSWindow, NSWindowButton};
        use cocoa::foundation::NSRect;
        use objc::{msg_send, sel, sel_impl};

        let window = self.ns_window().unwrap() as cocoa::base::id;

        unsafe {
            let close = window
                .standardWindowButton_(NSWindowButton::NSWindowCloseButton);
            let miniaturize = window.standardWindowButton_(
                NSWindowButton::NSWindowMiniaturizeButton,
            );
            let zoom = window
                .standardWindowButton_(NSWindowButton::NSWindowZoomButton);

            let title_bar_container_view = close.superview().superview();

            let close_rect: NSRect = msg_send![close, frame];
            let button_height = close_rect.size.height;

            let title_bar_frame_height = button_height + y;
            let mut title_bar_rect = NSView::frame(title_bar_container_view);
            title_bar_rect.size.height = title_bar_frame_height;
            title_bar_rect.origin.y =
                NSView::frame(window).size.height - title_bar_frame_height;
            let _: () =
                msg_send![title_bar_container_view, setFrame: title_bar_rect];

            let window_buttons = vec![close, miniaturize, zoom];
            let space_between = NSView::frame(miniaturize).origin.x
                - NSView::frame(close).origin.x;

            for (i, button) in window_buttons.into_iter().enumerate() {
                let mut rect: NSRect = NSView::frame(button);
                rect.origin.x = x + (i as f64 * space_between);
                button.setFrameOrigin(rect.origin);
            }
        }
    }
}
