use crate::objects::hit::Hit;
use crate::objects::sphere::Sphere;
use crate::objects::traits::Hittable;
use crate::objects::triangle::Triangle;
use crate::ray::Ray;
use crate::{objects::materials::traits::Material, vec3::Vec3};
use std::fmt::Debug;
use std::sync::Arc;

pub struct Quad {
    p1: Vec3,
    p2: Vec3,
    p3: Vec3,
    p4: Vec3,
    material: Arc<dyn Material>,
    normal: Vec3,
}

impl Quad {
    pub fn new(p1: Vec3, p2: Vec3, p3: Vec3, p4: Vec3, material: Arc<dyn Material>) -> Self {
        Self {
            p1,
            p2,
            p3,
            p4,
            material,
            normal: (p2 - p1).cross(&(p4 - p1)).get_unit(),
        }
    }
    pub fn corner_spheres(&self) -> Vec<Sphere> {
        vec![
        Sphere::new(self.p1, 1., self.material.clone()),
        Sphere::new(self.p2, 1., self.material.clone()),
        Sphere::new(self.p3, 1., self.material.clone()),
        Sphere::new(self.p4, 1., self.material.clone()),
        ]
    }

    pub fn hit(
        p1: Vec3,
        p2: Vec3,
        p3: Vec3,
        p4: Vec3,
        material: Arc<dyn Material>,
        normal: Vec3,
        r: &Ray,
    ) -> Option<Hit> {
        let isct1 = Triangle::hit(p1, p2, p4, material.clone(), normal, r);
        let isct2 = Triangle::hit(p2, p3, p4, material.clone(), normal, r);
        if isct1.is_some() {
            return isct1;
        }
        isct2
    }
}

impl Debug for Quad {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Triangle")
            .field("p1", &self.p1)
            .field("p2", &self.p2)
            .field("p3", &self.p3)
            .field("p4", &self.p4)
            .field("material", &self.material)
            .finish()
    }
}

impl Hittable for Quad {
    fn hit(&self, r: &Ray) -> Option<Hit> {
        Quad::hit(
            self.p1,
            self.p2,
            self.p3,
            self.p4,
            self.material.clone(),
            self.normal,
            r,
        )
    }

    fn normal_at(&self, _p: &Vec3) -> Vec3 {
        // FIXME: might cause ownership issues
        self.normal
    }
}