use games::*;

fn main() {
    App::new()
        .add_plugins((BaseGamePlugin {
            name: "parallax example".into(),
            title: "Parallax".into(),
            game_type: GameType::Two,
        },))
        .add_systems(Startup, spawn_background)
        .add_systems(Update, move_camera)
        .add_systems(Update, parallax_gizmos)
        .run();
}

fn spawn_background(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    let mesh = Mesh2d(meshes.add(Circle::new(1.0)));
    let material = MeshMaterial2d(materials.add(ColorMaterial::from_color(RED)));
    let transform = Transform::default().with_scale(Vec3::splat(50.0));
    commands.spawn((
        Name::new("Depth: 1"),
        transform,
        mesh.clone(),
        material.clone(),
        ParallaxDepth(1.0),
        Visibility::Inherited,
        children![(Text2d("1.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))],
    ));
    commands.spawn((
        Name::new("Depth: 2"),
        transform,
        mesh.clone(),
        material.clone(),
        ParallaxDepth(2.0),
        Visibility::Inherited,
        children![(Text2d("2.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))],
    ));
    commands.spawn((
        Name::new("Depth: 4"),
        transform,
        mesh.clone(),
        material.clone(),
        ParallaxDepth(4.0),
        Visibility::Inherited,
        children![(Text2d("4.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))],
    ));
    commands.spawn((
        Name::new("Depth: 8"),
        transform,
        mesh.clone(),
        material.clone(),
        ParallaxDepth(8.0),
        Visibility::Inherited,
        children![(Text2d("8.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))],
    ));
}

fn move_camera(mut t: Single<&mut Transform, With<Camera2d>>, keys: Res<ButtonInput<KeyCode>>) {
    if keys.pressed(KeyCode::ArrowLeft) {
        t.translation.x -= 5.0;
    } else if keys.pressed(KeyCode::ArrowRight) {
        t.translation.x += 5.0;
    }

    if keys.pressed(KeyCode::ArrowDown) {
        t.translation.y -= 5.0;
    } else if keys.pressed(KeyCode::ArrowUp) {
        t.translation.y += 5.0;
    }
}

fn parallax_gizmos(mut gizmos: Gizmos, q: Query<&Transform, With<ParallaxDepth>>) {
    // Closest to camera
    // Parallax(1)
    q.iter().for_each(|t| {
        gizmos
            .grid_2d(
                t.translation.truncate(),
                UVec2::new(5, 5),
                Vec2::splat(10.),
                RED,
            )
            .outer_edges();
    });
}