use josekit::{
    self,
    jws::{JwsHeader, alg::hmac::HmacJwsAlgorithm::Hs256},
    jwt::{self, JwtPayload},
};

pub const TOKENTYPE: &str = "JWT";
pub const KEY_ENV: &str = "SECRET_KEY";
pub const MESSAGE: &str = "Something random";
pub const ISSUER: &str = "icarus_auth";
pub const AUDIENCE: &str = "icarus";

pub fn get_key() -> Result<String, dotenvy::Error> {
    dotenvy::dotenv().ok();
    let key = std::env::var(KEY_ENV).expect("SECRET_KEY_NOT_FOUND");
    Ok(key)
}

pub fn create_token(provided_key: &String) -> Result<String, josekit::JoseError> {
    let mut header = JwsHeader::new();
    header.set_token_type(TOKENTYPE);

    let mut payload = JwtPayload::new();
    payload.set_subject(MESSAGE);
    payload.set_issuer(ISSUER);
    payload.set_audience(vec![AUDIENCE]);

    let key: String = if provided_key.is_empty() {
        get_key().unwrap()
    } else {
        provided_key.to_owned()
    };

    let signer = Hs256.signer_from_bytes(key.as_bytes()).unwrap();
    let jwt = josekit::jwt::encode_with_signer(&payload, &header, &signer).unwrap();

    Ok(jwt)
}

pub fn verify_token(key: &String, token: &String) -> bool {
    let ver = Hs256.verifier_from_bytes(key.as_bytes()).unwrap();
    let (payload, _header) = jwt::decode_with_verifier(token, &ver).unwrap();
    match payload.subject() {
        Some(_sub) => true,
        None => false,
    }
}

#[cfg(test)]
mod tests {

    use super::*;

    #[test]
    fn test_tokenize() {
        let special_key = get_key().unwrap();
        match create_token(&special_key) {
            Ok(token) => {
                let result = verify_token(&special_key, &token);
                assert!(result, "Token not verified");
            }
            Err(err) => {
                assert!(false, "Error: {:?}", err.to_string());
            }
        };
    }
}