use bevy::{color::palettes::css::*, prelude::*};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .insert_resource(ClearColor(WHITE.into()))
        .add_systems(Startup, setup_2d)
        .add_systems(Update, move_camera)
        .run();
}

#[derive(Component)]
struct ParallaxDistance(f32);

fn setup_2d(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    commands.spawn((
        Camera2d,
        AmbientLight {
            brightness: 160.0,
            ..default()
        },
    ));

    commands.spawn((
        Mesh2d(meshes.add(Rectangle::new(100.0, 100.0))),
        MeshMaterial2d(materials.add(Color::from(RED))),
        ParallaxDistance(1.0),
    ));

    commands.spawn((
        Mesh2d(meshes.add(Rectangle::new(100.0, 100.0))),
        MeshMaterial2d(materials.add(Color::from(GREEN))),
        ParallaxDistance(5.0),
    ));

    commands.spawn((
        Mesh2d(meshes.add(Rectangle::new(100.0, 100.0))),
        MeshMaterial2d(materials.add(Color::from(BLUE))),
        ParallaxDistance(10.0),
    ));
}

fn move_camera(keys: Res<ButtonInput<KeyCode>>, mut camera: Single<&mut Transform, With<Camera>>) {
    const SPEED: f32 = 0.1;
    if keys.pressed(KeyCode::ArrowLeft) {
        camera.translation.z += SPEED;
    } else if keys.pressed(KeyCode::ArrowRight) {
        camera.translation.z -= SPEED;
    } else if keys.pressed(KeyCode::ArrowUp) {
        camera.translation.x -= SPEED;
    } else if keys.pressed(KeyCode::ArrowDown) {
        camera.translation.x += SPEED;
    }
    info!("Position: {:?}", camera.translation);
}