use chrono::Local;

pub fn nintendo_base64_decode(encoded: &str) -> String {
    let standard_b64 = encoded
        .replace('.', "+")
        .replace('-', "/")
        .replace('*', "=");
    
    match base64::Engine::decode(&base64::engine::general_purpose::STANDARD, standard_b64) {
        Ok(bytes) => String::from_utf8_lossy(&bytes).into_owned(),
        Err(_) => String::new(),
    }
}

pub fn nintendo_base64_encode(decoded: &[u8]) -> String {
    let standard_b64 = base64::Engine::encode(&base64::engine::general_purpose::STANDARD, decoded);
    standard_b64
        .replace('+', ".")
        .replace('/', "-")
        .replace('=', "*")
}

pub fn nasc_date_time() -> String {
    Local::now().format("%Y%m%d%H%M%S").to_string()
}

pub fn nasc_error(error_code: &str) -> String {
    let return_cd = if error_code == "null" {
        error_code.to_string()
    } else {
        nintendo_base64_encode(error_code.as_bytes())
    };

    format!(
        "retry={}&returncd={}&datetime={}",
        nintendo_base64_encode(b"1"),
        return_cd,
        nintendo_base64_encode(nasc_date_time().as_bytes())
    )
}