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,
) {
    commands.spawn((Parallax(1.0), children![(Text2d("1.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))]));
    commands.spawn((Parallax(2.0), children![(Text2d("2.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))]));
    commands.spawn((Parallax(4.0), children![(Text2d("4.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))]));
    commands.spawn((Parallax(8.0), 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<Parallax>>,
) {
    // 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();
    });
}