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 PlaneAngle {
    Base(f64, fn(f64) -> f64, &'static str),
    Canonical(f64),
    Radian(f64),
    Degree(f64),
}

impl Unit<PlaneAngle> for PlaneAngle {
    fn to_si_unit(&self) -> PlaneAngle {
        match self {
            PlaneAngle::Base(_, _, _) => self.clone(),
            PlaneAngle::Canonical(value) => PlaneAngle::Base(value.clone(), |x| x, "m²"),
            PlaneAngle::Radian(value) => PlaneAngle::Base(value.clone(), |x| x, "rad"),
            PlaneAngle::Degree(value) => PlaneAngle::Base(value * std::f64::consts::PI / 180.0, |x| x / std::f64::consts::PI * 180.0, "°"),
        }
    }
}

declare_unit_basics!(PlaneAngle);