use bevy::prelude::*;
pub struct Race;
impl Plugin for Race {
    fn build(&self, app: &mut App) {
        app.add_plugins(MinimalPlugins)
            .insert_resource(RoundTimer(Timer::from_seconds(1., true)))
            .add_startup_system(add_racers)
            .add_system(racers_movement_system);
    }
}
#[derive(Component)]
struct Racer(usize);
#[derive(Component)]
struct Velocity(f32);
#[derive(Component)]
struct Position(f32);
#[derive(Component)]
struct Acceleration(f32);
fn add_racers(mut commands: Commands) {
    commands
        .spawn()
        .insert(Racer(1))
        .insert(Position(0.))
        .insert(Velocity(0.))
        .insert(Acceleration(2.));
    commands
        .spawn()
        .insert(Racer(2))
        .insert(Position(0.))
        .insert(Velocity(0.))
        .insert(Acceleration(4.));
    commands
        .spawn()
        .insert(Racer(3))
        .insert(Position(0.))
        .insert(Velocity(0.))
        .insert(Acceleration(0.5));
}
struct RoundTimer(Timer);
fn racers_movement_system(
    time: Res<Time>,
    mut timer: ResMut<RoundTimer>,
    mut query: Query<(&Racer, &mut Position, &mut Velocity, &Acceleration)>,
) {
    if timer.0.tick(time.delta()).just_finished() {
        for (r, mut p, mut v, a) in query.iter_mut() {
            print!("Racer {} from {:?} ", r.0, (p.0, v.0, a.0));
            v.0 = v.0 + a.0;
            p.0 = p.0 + v.0;
            println!("to {:?}", (p.0, v.0, a.0));
        }
        println!("")
    }
}

use crate::race::Race;
mod race;

    App::new().run();

    App::new().add_plugin(Race).run();