use super::funejson::Value;

/// Whether a number is a usable TCP or UDP port: a whole number from 1 to
/// 65535. Port 0 is reserved (RFC 6335) and asks the operating system to pick
/// one, so it is never a port to connect to.
pub fn is_port(value: i64) -> bool {
    (1..=65535).contains(&value)
}

pub fn fune_vector(args: &[Value]) -> Value {
    // A fraction or a non-number is not a port, as TypeScript and Python answer.
    match &args[0] {
        Value::Int(i) => Value::Bool(is_port(*i)),
        Value::Float(f) if f.fract() == 0.0 && f.abs() < 1e15 => Value::Bool(is_port(*f as i64)),
        _ => Value::Bool(false),
    }
}