use std::net::IpAddr;

/// Perform reverse DNS lookup on a single IP.
/// Returns the hostname if found, None otherwise.
pub async fn reverse_lookup(ip: IpAddr) -> Option<String> {
    let result = tokio::task::spawn_blocking(move || dns_lookup::lookup_addr(&ip)).await;

    match result {
        Ok(Ok(hostname)) => {
            if hostname == ip.to_string() {
                None
            } else {
                Some(hostname)
            }
        }
        _ => None,
    }
}