use std::ops::*;

pub fn convolve<A, B, C>(signal: &[A], kernel: &[B], mode: &str) -> Vec<f64>
    where A: Mul<B>,
          <A as Mul<B>>::Output: Add<C>
{
    let y: Vec<f64> = signal.windows(kernel.len()).map(|window| {
        window.iter().zip(kernel.iter().rev()).map(|(x,y)|x*y).sum()
    }).collect();

    match mode {
    "full" => println!("full"),
    "same" => println!("same"),
    "valid" => println!("valid"),
    _ => println!("none"),
    };
    return y;
}

fn main() {

    let a = vec![1,2,3,4];
    let b = vec![1,1,1];
    let conv = convolve(&a, &b, "full");

}