use bevy::prelude::*;

struct Bananas {
    bananas: String
}

fn init(commands: &mut Commands) {
    commands.spawn((Bananas { bananas: String::from("🍌") }, ));

    commands.spawn((Bananas { bananas: String::from("this banana is overwritten") }, ))
        .with(Bananas { bananas: String::from("this banana isn't change detected") });
}

fn changed_bananas(query: Query<&Bananas, Added<Bananas>>) {
    for bananas in query.iter() {
        info!("added query banana: {}", bananas.bananas);
    }
}

fn all_bananas(query: Query<&Bananas>) {
    for bananas in query.iter() {
        info!("normal query banana: {}", bananas.bananas);
    }
}

#[bevy_main]
fn main() {
    App::build()
        .add_plugin(bevy::log::LogPlugin)
        .add_startup_system(init.system())
        .add_system(changed_bananas.system())
        .add_system(all_bananas.system())
        .run();
}