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use types::CBytes;

pub trait Authenticator: Clone {
    fn get_auth_token(&self) -> CBytes;
    fn get_cassandra_name(&self) -> Option<&str>;
}

#[derive(Debug, Clone)]
pub struct PasswordAuthenticator<'a> {
    username: &'a str,
    password: &'a str,
}

impl<'a> PasswordAuthenticator<'a> {
    pub fn new<'b>(username: &'b str, password: &'b str) -> PasswordAuthenticator<'b> {
        PasswordAuthenticator { username: username,
                                password: password, }
    }
}

impl<'a> Authenticator for PasswordAuthenticator<'a> {
    fn get_auth_token(&self) -> CBytes {
        let mut token = vec![0];
        token.extend_from_slice(self.username.as_bytes());
        token.push(0);
        token.extend_from_slice(self.password.as_bytes());

        CBytes::new(token)
    }

    fn get_cassandra_name(&self) -> Option<&str> {
        Some("org.apache.cassandra.auth.PasswordAuthenticator")
    }
}

#[derive(Debug, Clone)]
pub struct NoneAuthenticator;

impl Authenticator for NoneAuthenticator {
    fn get_auth_token(&self) -> CBytes {
        CBytes::new(vec![0])
    }

    fn get_cassandra_name(&self) -> Option<&str> {
        None
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_password_authenticator_trait_impl() {
        let authenticator = PasswordAuthenticator::new("a", "a");
        let _ = authenticator_tester(Box::new(authenticator));
    }

    #[test]
    fn test_password_authenticator_new() {
        PasswordAuthenticator::new("foo", "bar");
    }

    #[test]
    fn test_password_authenticator_get_cassandra_name() {
        let auth = PasswordAuthenticator::new("foo", "bar");
        assert_eq!(auth.get_cassandra_name(),
                   Some("org.apache.cassandra.auth.PasswordAuthenticator"));
    }

    #[test]
    fn test_password_authenticator_get_auth_token() {
        let auth = PasswordAuthenticator::new("foo", "bar");
        let mut expected_token = vec![0];
        expected_token.extend_from_slice("foo".as_bytes());
        expected_token.push(0);
        expected_token.extend_from_slice("bar".as_bytes());

        assert_eq!(auth.get_auth_token().into_plain().unwrap(), expected_token);
    }

    #[test]
    fn test_authenticator_none_get_cassandra_name() {
        let auth = NoneAuthenticator;
        assert_eq!(auth.get_cassandra_name(), None);
        assert_eq!(auth.get_auth_token().into_plain().unwrap(), vec![0]);
    }

    fn authenticator_tester<A: Authenticator>(_authenticator: Box<A>) {}

}