use super::funejson::Value;

/// A heartbeat as one check behind a status page component. Late is
/// degraded, not down: the job may still ping within its grace time, which is
/// what the grace time is for. A new heartbeat has proved nothing either way,
/// so it is None rather than a guess.
///
/// # Panics
/// Panics on an unknown state.
pub fn heartbeat_check(state: &str) -> Option<String> {
    match state {
        "new" => None,
        "up" => Some("up".to_string()),
        "late" => Some("degraded".to_string()),
        "down" => Some("down".to_string()),
        other => panic!("unknown heartbeat state: {}", other),
    }
}

pub fn fune_vector(args: &[Value]) -> Value {
    let state = args[0].as_str().to_string();
    match heartbeat_check(&state) {
        Some(s) => Value::str(&s),
        None => Value::Null,
    }
}