use chrono::Duration;
use chrono::Utc;

/// Takes a number as input and waits that many seconds before exiting.
///
/// Runnable with `cargo run --example=wait_for -- 2`.
#[tokio::main]
async fn main() {
    let mut arguments = std::env::args();
    arguments.next().expect("process executable has a name");
    let arg1 = arguments.next().expect("first argument is specified");

    let duration: i64 = arg1.parse().expect("first argument is a valid integer");
    let duration = Duration::seconds(duration);

    let timeout = Utc::now() + duration;
    tokio_walltime::sleep_until(timeout)
        .await
        .expect("timer completes okay");
}