use rand;

use perlin::Perlin;
use texture::Texture;
use vec3::Vec3;

pub struct NoiseTexture {
    scale: f32,
    perlin: Perlin,
}

impl NoiseTexture {
    pub fn new<R>(rng: &mut R) -> NoiseTexture
    where
        R: rand::Rng,
    {
        NoiseTexture::with_scale(rng, 1.)
    }
    pub fn with_scale<R>(rng: &mut R, scale: f32) -> NoiseTexture
    where
        R: rand::Rng,
    {
        NoiseTexture {
            scale,
            perlin: Perlin::new(rng),
        }
    }
}

impl Texture for NoiseTexture {
    fn value(&self, _u: f32, _v: f32, p: Vec3) -> Vec3 {
        Vec3::new(1., 1., 1.) * 0.5 * (1. + self.perlin.noise(self.scale * p))

        //Vec3::new(1., 1., 1.) * turb(self.scale * p, 7)
        //Vec3::new(1., 1., 1.) * 0.5 * (1. + turb(self.scale * p, 7))
        //Vec3::new(1., 1., 1.) * 0.5 * (1. + (self.scale * p.z + 10. * self.perlin.turb(p, 7)).sin())
        //Vec3::new(1., 1., 1.) * 0.5 * (1. + GENERATOR.noise(self.scale * p))
    }
}