use crate::material::Material;
use crate::ray::Ray;
use cgmath::{dot, Vector3};

pub struct Hit<'a> {
    pub t: f64,
    pub p: Vector3<f64>,
    pub normal: Vector3<f64>,
    pub front_face: bool,
    pub material: &'a (dyn Material + std::marker::Sync),
}

impl<'a> Hit<'a> {
    pub fn new(
        ray: &Ray,
        t: f64,
        out_normal: Vector3<f64>,
        material: &'a (dyn Material + std::marker::Sync),
    ) -> Hit<'a> {
        let front_face = dot(ray.dir, out_normal) < 0.0;
        let normal = if front_face { out_normal } else { -out_normal };
        let p = ray.at(t);
        Hit {
            t,
            p,
            normal,
            front_face,
            material,
        }
    }
}

pub trait Hittable {
    fn is_hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<Hit>;
}