//! Custom serialization methods used throughout the crate

/// Deserialize/Serialize `Modality` to integer(0, 1, -1).
pub mod modality {
    use crate::Modality;
    use serde::{de, Deserialize, Serializer};

    pub fn deserialize<'de, D>(d: D) -> Result<Modality, D::Error>
    where
        D: de::Deserializer<'de>,
    {
        let v = i8::deserialize(d)?;
        match v {
            0 => Ok(Modality::Minor),
            1 => Ok(Modality::Major),
            -1 => Ok(Modality::NoResult),
            _ => Err(de::Error::invalid_value(
                de::Unexpected::Signed(v.into()),
                &"valid value: 0, 1, -1",
            )),
        }
    }

    pub fn serialize<S>(x: &Modality, s: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match x {
            Modality::Minor => s.serialize_i8(0),
            Modality::Major => s.serialize_i8(1),
            Modality::NoResult => s.serialize_i8(-1),
        }
    }
}