#![allow(unused)]
fn main() {
    use std::collections::HashMap;

    let mut map: HashMap<[i64; 2], String> = HashMap::new();
    map.insert([1,1], String::from("1x1"));
    map.insert([1,2], String::from("1x2"));
    map.insert([1,3], String::from("1x3"));

    let str = "13";

    // Ugly as hell - how do I make this more rust-like?
    let a = cast_to_i64(str.chars().nth(0));
    let b = cast_to_i64(str.chars().nth(1));

    if a.is_none() || b.is_none() {
        print!("nothing is good");
        return;
    }

    if let Some(x) = map.get_mut(&[a.unwrap(),b.unwrap()]) {
        print!("got it: {}, ", x);
        *x = String::from("1x4");
    }

    if let Some(x) = map.get_mut(&[a.unwrap(),b.unwrap()]) {
        print!("again: got it: {}", x);
    }
}

fn cast_to_i64(c: Option<char>) -> Option<i64> {
    if c.is_none() || c.unwrap().to_digit(10).is_none() {
        return None;
    }

    let digit = c.unwrap().to_digit(10).unwrap() as i64;

    return Some(digit);
}