use serde::{Deserialize, Serialize};

#[derive(Debug, zvariant::Type, PartialEq, Eq, Copy, Clone)]

#[zvariant(signature = "s")]

/// Algorithm used to start a new session.

///

/// The communication between the Secret Service and the application can either

/// be encrypted or the items can be sent in plain text.

pub enum Algorithm {

    /// Plain text, per <https://specifications.freedesktop.org/secret-service-spec/latest/ch07s02.html>.

    Plain,

    /// Encrypted, per <https://specifications.freedesktop.org/secret-service-spec/latest/ch07s03.html>.

    Encrypted,

}

const PLAIN_ALGORITHM: &str = "plain";

const ENCRYPTED_ALGORITHM: &str = "dh-ietf1024-sha256-aes128-cbc-pkcs7";

impl Serialize for Algorithm {

    where

        S: serde::Serializer,

    {

        }

    }

}

impl<'de> Deserialize<'de> for Algorithm {

    where

        D: serde::Deserializer<'de>,

    {

        }

    }

}

#[cfg(test)]

mod tests {

    use zvariant::{Endian, serialized::Context, to_bytes};

    use super::*;

    #[test]

    fn serialization() {

        let ctxt = Context::new_dbus(Endian::Little, 0);

        // Test serializing Plain

        let encoded = to_bytes(ctxt, &Algorithm::Plain).unwrap();

        let value: String = encoded.deserialize().unwrap().0;

        assert_eq!(value, "plain");

        // Test serializing Encrypted

        let encoded = to_bytes(ctxt, &Algorithm::Encrypted).unwrap();

        let value: String = encoded.deserialize().unwrap().0;

        assert_eq!(value, "dh-ietf1024-sha256-aes128-cbc-pkcs7");

        // Test deserializing plain

        let encoded = to_bytes(ctxt, &PLAIN_ALGORITHM).unwrap();

        let algo: Algorithm = encoded.deserialize().unwrap().0;

        assert_eq!(algo, Algorithm::Plain);

        // Test deserializing encrypted

        let encoded = to_bytes(ctxt, &ENCRYPTED_ALGORITHM).unwrap();

        let algo: Algorithm = encoded.deserialize().unwrap().0;

        assert_eq!(algo, Algorithm::Encrypted);

        // Test deserializing invalid algorithm

        let encoded = to_bytes(ctxt, &"invalid-algorithm").unwrap();

        let result: Result<(Algorithm, _), _> = encoded.deserialize();

        assert!(result.is_err());

        assert!(

            result

                .unwrap_err()

                .to_string()

                .contains("Invalid algorithm")

        );

        // Test roundtrip for Plain

        let original = Algorithm::Plain;

        let encoded = to_bytes(ctxt, &original).unwrap();

        let decoded: Algorithm = encoded.deserialize().unwrap().0;

        assert_eq!(original, decoded);

        // Test roundtrip for Encrypted

        let original = Algorithm::Encrypted;

        let encoded = to_bytes(ctxt, &original).unwrap();

        let decoded: Algorithm = encoded.deserialize().unwrap().0;

        assert_eq!(original, decoded);

    }

}