use bevy::prelude::*;

#[derive(Component)]
struct Rotator;

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

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(0.0, 12.0, 18.0).looking_at(Vec3::ZERO, Vec3::Y),
        ..default()
    });

    commands.spawn(PointLightBundle {
        point_light: PointLight {
            shadows_enabled: true,
            ..default()
        },
        transform: Transform::from_xyz(4.0, 8.0, 4.0),
        ..default()
    });

    for x in 0..24 {
        for y in 0..24 {
            let x = x - 12;
            let y = y - 12;
            let z = if x == -12 || x == 11 || y == -12 || y == 11 || rand::random::<f32>() < 0.25 {
                0.0
            } else {
                -2.0
            };
            let rotation = match rand::random::<u8>() % 4 {
                0 => 0.0,
                1 => 0.5,
                2 => 1.0,
                _ => 1.5,
            } * std::f32::consts::PI;
            commands.spawn(SceneBundle {
                scene: asset_server.load("test-cube.glb#Scene0"),
                transform: Transform::from_xyz((x * 2) as f32, z, (y * 2) as f32)
                    .with_rotation(Quat::from_rotation_y(rotation)),
                ..default()
            });
        }
    }
}

fn rotate(mut query: Query<&mut Transform, With<Rotator>>, time: Res<Time>) {
    for mut transform in &mut query {
        transform.rotate_y(time.delta_seconds() / 2.);
    }
}