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use std::time::Duration;

pub fn format(duration: &Duration) -> String {
    match duration.as_micros() > 999 {
        // greater than 999 microseconds
        false => format!("{}\u{00b5}s", duration.as_micros()),
        true => match duration.as_millis() > 999 {
            // greater that 999 milliseconds
            false => format!("{}ms", duration.as_millis()),
            true => match duration.as_secs() > 99 {
                // greater than 99 seconds
                false => format!("{}s", duration.as_secs()),
                true => match duration.as_secs() > 5940 {
                    // greater than 99 minutes
                    false => format!("{}m", duration.as_secs() / 60),
                    true => match duration.as_secs() > 356400 {
                        // greater than 99 hours
                        false => format!("{}h", duration.as_secs() / 3600),
                        true => match duration.as_secs() > 8553600 {
                            // greater than 99 days
                            false => format!("{}d", duration.as_secs() / 86400),
                            true => format!("{} months", duration.as_secs() / (86400 * 30)),
                        },
                    },
                },
            },
        },
    }
}

#[cfg(test)]
use crate::duration;

#[test]
fn format_test() {
    assert_eq!("15µs", duration::format(&Duration::from_micros(15)));
}