use crate::{
    objects::{hit::Hit, materials::traits::Material},
    ray::Ray,
    vec3::Colour,
};

pub struct Dielectric {
    refraction_index: f32,
}

impl Dielectric {
    pub fn new(refraction_index: f32) -> Self {
        Self {
            refraction_index: refraction_index,
        }
    }
}

impl Material for Dielectric {
    fn scatter(&self, hit: &Hit, ray: &Ray) -> Option<(Ray, Colour)> {
        let ri = if hit.front_face() {
            1. / self.refraction_index
        } else {
            self.refraction_index
        };
        let unit = ray.dir().get_unit();
        let refr = unit.refract(hit.n(), ri);
        Some((Ray::new(*hit.p(), refr), Colour::new(1., 1., 1.)))
    }
}