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use super::precision::*;
use std::ops::*;

#[derive(Clone, Eq, PartialEq)]
pub struct Timestamp(pub(crate) u64);

#[derive(Clone, Eq, PartialEq, Ord, PartialOrd)]
pub struct Elapsed(u64);

impl Sub for Timestamp {
    type Output = Elapsed;

    #[inline]
    fn sub(self, ts: Timestamp) -> Self::Output {
        if self.0 >= ts.0 {
            Elapsed(self.0 - ts.0)
        } else {
            Elapsed(self.0 + (!ts.0) + 1)
        }
    }
}

impl Add for Elapsed {
    type Output = Elapsed;

    #[inline]
    fn add(self, other: Elapsed) -> Self::Output {
        Elapsed(self.0 + other.0)
    }
}

impl Elapsed {
    #[inline]
    pub fn ticks(&self) -> u64 {
        self.0
    }

    #[inline]
    pub fn as_secs(&self, precision: &Precision) -> u64 {
        self.0 / precision.frequency
    }

    #[inline]
    pub fn as_secs_f64(&self, precision: &Precision) -> f64 {
        self.0 as f64 / precision.frequency as f64
    }

    #[inline]
    pub fn as_millis(&self, precision: &Precision) -> u64 {
        self.0 * 1_000 / precision.frequency
    }
}