use std::ops::Deref;
use rust_util::{opt_result, success, XResult};
use yubico_manager::config::{Config, Mode, Slot};
use yubico_manager::Yubico;

pub fn yubikey_challenge_as_32_bytes(challenge_bytes: &[u8]) -> XResult<Vec<u8>> {
    let mut yubi = Yubico::new();
    let device = opt_result!(yubi.find_yubikey(), "Find yubikey failed: {}");

    success!("Found key, Vendor ID: {:?}, Product ID: {:?}", device.vendor_id, device.product_id);

    let config = Config::default()
        .set_vendor_id(device.vendor_id)
        .set_product_id(device.product_id)
        .set_variable_size(true)
        .set_mode(Mode::Sha1)
        .set_slot(Slot::Slot2);

    // In HMAC Mode, the result will always be the SAME for the SAME provided challenge
    let hmac_result = opt_result!(yubi.challenge_response_hmac(challenge_bytes, config), "Challenge HMAC failed: {}");

    // Just for debug, lets check the hex
    let v: &[u8] = hmac_result.deref();

    let mut r = vec![];
    r.extend_from_slice(v);
    r.extend_from_slice(&v[0..12]);
    Ok(r)
}