use snafu::{OptionExt as _, ResultExt as _, Snafu};
use std::num::ParseIntError;

pub type Microsecond = u32;

#[derive(Debug, Snafu)]
pub enum TakeError {
    /// microseconds are supposed to be followed by -
    Malformed,

    /// could not parse the microsecond as an integer
    ParseIntegerError { source: ParseIntError },
}

pub fn take(path: &str) -> Result<(Microsecond, &str), TakeError> {
    let (microsecond, rest) = path.split_once('-').context(MalformedSnafu)?;

    let microsecond = microsecond.parse().context(ParseIntegerSnafu)?;

    Ok((microsecond, rest))
}