//! Demonstrates how to make a gltf pickable. Clicking on any mesh will print out the entity that
//! was clicked on, even though we only need to add an `On<Pointer<Event>>` event listener to the
//! root of the scene.

use bevy::prelude::*;
use bevy_mod_picking::prelude::*;

fn main() {
    App::new()
        .add_plugins((
            DefaultPlugins.set(low_latency_window_plugin()),
            DefaultPickingPlugins
                .build()
                .disable::<DebugPickingPlugin>(),
        ))
        .insert_resource(DebugPickingMode::Normal)
        .add_systems(Startup, setup)
        .add_systems(Update, make_pickable)
        .run();
}

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    commands.spawn((Camera3dBundle {
        transform: Transform::from_xyz(0.7, 0.7, 1.0).looking_at(Vec3::new(0.0, 0.3, 0.0), Vec3::Y),
        ..default()
    },));
    commands.spawn(DirectionalLightBundle::default());
    commands.spawn((
        SceneBundle {
            scene: asset_server.load("models/FlightHelmet/FlightHelmet.gltf#Scene0"),
            ..default()
        },
        // Events that target children of the scene will bubble up to this level and will fire off a
        // `HelmetClicked` event.
        On::<Pointer<Click>>::run(|event: Listener<Pointer<Click>>| {
            info!("Clicked on entity {:?}", event.target);
        }),
    ));
}

/// Makes everything in the scene with a mesh pickable
fn make_pickable(
    mut commands: Commands,
    meshes: Query<Entity, (With<Handle<Mesh>>, Without<Pickable>)>,
) {
    for entity in meshes.iter() {
        commands
            .entity(entity)
            .insert((PickableBundle::default(), HIGHLIGHT_TINT.clone()));
    }
}

/// Used to tint the mesh instead of simply replacing the mesh's material with a single color. See
/// `tinted_highlight` for more details.
const HIGHLIGHT_TINT: Highlight<StandardMaterial> = Highlight {
    hovered: Some(HighlightKind::new_dynamic(|matl| StandardMaterial {
        base_color: matl
            .base_color
            .mix(&Color::srgba(-0.5, -0.3, 0.9, 0.8), 0.5), // hovered is blue
        ..matl.to_owned()
    })),
    pressed: Some(HighlightKind::new_dynamic(|matl| StandardMaterial {
        base_color: matl
            .base_color
            .mix(&Color::srgba(-0.4, -0.4, 0.8, 0.8), 0.5), // pressed is a different blue
        ..matl.to_owned()
    })),
    selected: Some(HighlightKind::new_dynamic(|matl| StandardMaterial {
        base_color: matl
            .base_color
            .mix(&Color::srgba(-0.4, 0.8, -0.4, 0.0), 0.5), // selected is green
        ..matl.to_owned()
    })),
};