use bevy::{prelude::*, gltf::Gltf};

fn main() {
    App::new()
        .add_plugins((
            DefaultPlugins,
        ))
        .add_systems(Startup, startup)
        .add_systems(Update, inspect)
        .run();
}

#[derive(Debug, Resource)]
struct AssetRegistry {
	gltfs: Vec<Handle<Gltf>>,
}

fn startup(server: Res<AssetServer>, mut commands: Commands) {
	commands.insert_resource(AssetRegistry {
		gltfs: server.load_folder("gltf").expect("Loading GLTF Assets").into_iter().map(|untyped| untyped.typed::<Gltf>()).collect()
    });

    commands.spawn(SpotLightBundle { 
        transform: Transform::from_xyz(0.0, 5.0, 0.0).looking_at(Vec3::ZERO, Vec3::Y),
        ..default()
    });

    commands.spawn(Camera3dBundle { 
        transform: Transform::from_xyz(1.0, 1.0, 1.0).looking_at(Vec3::new(0.0, 0.3, 0.0), Vec3::Y),
        ..default() });
}

fn inspect(mut events: EventReader<AssetEvent<Gltf>>, gltfs: Res<Assets<Gltf>>, mut commands: Commands) {
    events.iter().for_each(|event| {
        match event {
            AssetEvent::Created { handle } => {
                let gltf = gltfs.get(handle).expect("Fetch GLTF data");
                commands.spawn(SceneBundle {
                    scene: gltf.named_scenes.get("Helmet").expect("Fetch board scene").clone(),
                    ..default()
                });
            },
            _ => ()
        }
    });
}