use rand::Rng;
pub fn generate(rng: &mut rand::rngs::ThreadRng) -> String {
let year = rng.gen_range(0..=99);
let month = rng.gen_range(1..=12);
let day = rng.gen_range(1..=28);
let century = rng.gen_range(0..=5); // 1900s
format!(
"{:02}{:02}{:02}{}{:04}",
year,
month,
day,
century,
rng.gen_range(0..10000)
)
}
pub fn validate(code: &str) -> bool {
let clean: String = code.chars().filter(|c| c.is_ascii_digit()).collect();
if clean.len() != 11 {
return false;
}
// Logic: YYMMDD + century_code + serial
// We just check length and numeric as in stdnum.cu.ni
true
}