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 Pressure {
    Base(f64, fn(f64) -> f64, &'static str),
    Canonical(f64),
    Pascal(f64),
    Bar(f64),
}

impl Unit<Pressure> for Pressure {
    fn to_si_unit(&self) -> Pressure {
        match self {
            Pressure::Base(_, _, _) => self.clone(),
            Pressure::Canonical(value) => Pressure::Base(value.clone(), |x| x, "Pa"),
            Pressure::Pascal(value) => Pressure::Base(value.clone(), |x| x, "Pa"),
            Pressure::Bar(value) => Pressure::Base(value * 100_000.0, |x| x / 100_000.0, "bar"),
        }
    }
}

declare_unit_basics!(Pressure);