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// std
use std::ops::Mul;
use std::sync::Arc;
// pbrt
use crate::core::interaction::SurfaceInteraction;
use crate::core::texture::Texture;

pub struct ScaleTexture<T> {
    pub tex1: Arc<dyn Texture<T> + Send + Sync>,
    pub tex2: Arc<dyn Texture<T> + Send + Sync>,
}

impl<T: Copy> ScaleTexture<T> {
    pub fn new(
        tex1: Arc<dyn Texture<T> + Send + Sync>,
        tex2: Arc<dyn Texture<T> + Send + Sync>,
    ) -> Self {
        ScaleTexture { tex1, tex2 }
    }
}

impl<T: Copy> Texture<T> for ScaleTexture<T>
where
    T: Mul<Output = T>,
{
    fn evaluate(&self, si: &SurfaceInteraction) -> T {
        self.tex1.evaluate(si) * self.tex2.evaluate(si)
    }
}