use std::fmt::{Display, Formatter, Result};
use std::ops::{Add, Sub, AddAssign, SubAssign, Div, Mul, DivAssign, MulAssign};

use crate::metric::Unit;
use crate::metric::Primitive;

use crate::declare_unit_basics;

#[derive(Copy, Clone, Debug, PartialOrd, PartialEq)]
pub enum Time {
    Base(f64, fn(f64) -> f64, &'static str),
    Canonical(f64),
    Second(f64),
    Millisecond(f64),
    Minute(f64),
    Hour(f64),
    Day(f64),
    Year(f64),
}

impl Unit<Time> for Time {
    fn to_si_unit(&self) -> Time {
        match self {
            Time::Base(_, _, _) => self.clone(),
            Time::Canonical(value) => Time::Base(value.clone(), |x| x, "s"),
            Time::Second(value) => Time::Base(value.clone(), |x| x, "s"),
            Time::Millisecond(value) => Time::Base(value / 1000.0, |x| x * 1000.0, "ms"),
            Time::Minute(value) => Time::Base(value * 60.0, |x| x / 60.0, "min"),
            Time::Hour(value) => Time::Base(value * 3600.0, |x| x / 3600.0, "h"),
            Time::Day(value) => Time::Base(value * 86400.0, |x| x / 86400.0, "d"),
            Time::Year(value) => Time::Base(value * 31536000.0, |x| x / 31536000.0, "a")
        }
    }
}

declare_unit_basics!(Time);