use i_slint_backend_winit::{
    Backend,
    winit::{
        platform::x11::{WindowAttributesExtX11, WindowType},
        window::WindowAttributes,
    },
};
use x11rb::{connection::Connection, rust_connection::RustConnection};

pub fn get_screen_size() -> Result<(i32, i32), Box<dyn std::error::Error>> {
    let (conn, screen_num) = RustConnection::connect(None)?;
    let screen = &conn.setup().roots[screen_num];

    Ok((
        screen.width_in_pixels as i32,
        screen.height_in_pixels as i32,
    ))
}

pub fn init_slint_backend() -> Result<(), Box<dyn std::error::Error>> {
    // Configure X11 window attributes before Slint creates the window.
    let window_attrs = |attrs: WindowAttributes| {
        attrs
            // Set the window type to Desktop so WMs avoid normal window rules, treat it as a full screen window.
            .with_x11_window_type(vec![WindowType::Desktop])
            // Make the window unmanaged. This prevents tiling WMs from reserving space or moving it.
            .with_override_redirect(true)
    };

    // Build and activate backend with X11 window-attribute hook.
    let backend = Backend::builder()
        .with_window_attributes_hook(window_attrs)
        .build()?;

    slint::platform::set_platform(Box::new(backend))?;

    Ok(())
}