//! kv-model TOTP / otpauth:// parse, then code generation at fuzzed times.
#![no_main]
use kv_model::totp::Totp;
use libfuzzer_sys::fuzz_target;

fuzz_target!(|data: &[u8]| {
    if data.len() < 8 {
        return;
    }
    let t = u64::from_le_bytes(data[..8].try_into().unwrap());
    let Ok(s) = std::str::from_utf8(&data[8..]) else { return };
    if let Ok(totp) = Totp::parse(s) {
        let code = totp.code_at(t);
        assert_eq!(code.len(), totp.digits as usize);
        assert!(code.bytes().all(|c| c.is_ascii_digit()));
        let r = totp.remaining(t);
        assert!(r >= 1 && r <= totp.period);
    }
});