use bevy::prelude::*;
use bevy_vello::{VelloPlugin, prelude::*, vello::kurbo::Point};
use rand::Rng;
use std::ops::DerefMut;

const JITTER: f64 = 0.5;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_plugins(VelloPlugin::default())
        .add_systems(Startup, setup_vector_graphics)
        .add_systems(PostStartup, draw_map)
        .run();
}

fn setup_vector_graphics(mut commands: Commands) {
    commands.spawn((Camera2d, VelloView));
    commands.spawn(VelloScene::new());
}

fn draw_map(mut query_scene: Single<(&mut Transform, &mut VelloScene)>) {
    let (transform, scene) = query_scene.deref_mut();
    // Reset scene every frame
    scene.reset();

    let mut rng = rand::rng();
    for x in -20..=20 {
        for y in -10..=10 {
            let point = Point::new(
                (x as f64) + rng.random_range(-JITTER..=JITTER),
                (y as f64) + rng.random_range(-JITTER..=JITTER),
            );
            scene.fill(
                peniko::Fill::NonZero,
                kurbo::Affine::default(),
                peniko::Color::WHITE,
                None,
                &kurbo::Circle::new(point, 0.1),
            );
        }
    }

    transform.scale = Vec3::ONE * 25.0;
}