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use crate::encoding;
use anyhow::Error;
use meio_protocol::{ProtocolCodec, ProtocolData};

pub struct RRCodec;

impl ProtocolCodec for RRCodec {
    fn decode<T: ProtocolData>(data: &[u8]) -> Result<T, Error> {
        encoding::from_slice(data).map_err(Error::from)
    }

    fn encode<T: ProtocolData>(value: &T) -> Result<Vec<u8>, Error> {
        encoding::to_vec(value).map_err(Error::from)
    }
}

/// Serialize all iterable types as vectors.
pub mod vectorize {
    use serde::{Deserialize, Deserializer, Serialize, Serializer};
    use std::iter::FromIterator;

    pub fn serialize<'a, T, K, V, S>(target: T, ser: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
        T: IntoIterator<Item = (&'a K, &'a V)>,
        K: Serialize + 'a,
        V: Serialize + 'a,
    {
        let container: Vec<_> = target.into_iter().collect();
        serde::Serialize::serialize(&container, ser)
    }

    pub fn deserialize<'de, T, K, V, D>(des: D) -> Result<T, D::Error>
    where
        D: Deserializer<'de>,
        T: FromIterator<(K, V)>,
        K: Deserialize<'de>,
        V: Deserialize<'de>,
    {
        let container: Vec<_> = serde::Deserialize::deserialize(des)?;
        Ok(container.into_iter().collect())
    }
}