use owl::prelude::*;

#[model]
#[derive(Debug)]
pub struct Contact {
    pub id: Id,
    pub age: u16,
}

pub fn age_one_year(p: &mut Model<Contact>, db: &Database) {
    p.write(db, |p| p.age += 1);
}

pub fn main() {
    env_logger::init();

    // Init
    let db = Database::in_memory();

    let mut c1 = db.save(Contact {
        id: Id::String("c1".to_string()),
        age: 15,
    });
    let mut c2 = db.save(Contact {
        id: Id::String("c2".to_string()),
        age: 17,
    });
    let mut c3 = db.save(Contact {
        id: Id::String("c3".to_string()),
        age: 16,
    });

    let age_18_watcher = db.watch::<Contact, _, _>(
        |c| c.age == 18,
        |c| {
            println!("{} turned 18", c.id);
        },
    );

    std::thread::spawn(move || loop {
        age_18_watcher.process();
    });

    age_one_year(&mut c1, &db);
    age_one_year(&mut c2, &db);
    age_one_year(&mut c3, &db);

    age_one_year(&mut c1, &db);
    age_one_year(&mut c2, &db);
    age_one_year(&mut c3, &db);

    age_one_year(&mut c1, &db);
    age_one_year(&mut c2, &db);
    age_one_year(&mut c3, &db);

    age_one_year(&mut c1, &db);
    age_one_year(&mut c2, &db);
    age_one_year(&mut c3, &db);

    std::thread::sleep(std::time::Duration::from_secs(10));
}