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use crate::buffer::{BufReader, BufWriter};
use crate::de::{Deserialize, DeserializeSeed};
use crate::ser::Serialize;
use crate::Typespace;

pub mod de;
pub mod ser;

pub use de::Deserializer;
pub use ser::Serializer;

pub use crate::buffer::DecodeError;

pub fn to_writer<W: BufWriter, T: Serialize + ?Sized>(w: &mut W, value: &T) -> Result<(), ser::BsatnError> {
    value.serialize(Serializer::new(w))
}

pub fn to_vec<T: Serialize + ?Sized>(value: &T) -> Result<Vec<u8>, ser::BsatnError> {
    let mut v = Vec::new();
    to_writer(&mut v, value)?;
    Ok(v)
}

pub fn from_reader<'de, R: BufReader<'de>, T: Deserialize<'de>>(r: &mut R) -> Result<T, DecodeError> {
    T::deserialize(Deserializer::new(r))
}

pub fn from_slice<'de, T: Deserialize<'de>>(b: &'de [u8]) -> Result<T, DecodeError> {
    from_reader(&mut &b[..])
}

static EMPTY_TYPESPACE: Typespace = Typespace::new(Vec::new());

macro_rules! codec_funcs {
    ($ty:ty) => {
        impl $ty {
            pub fn decode<'a>(bytes: &mut impl BufReader<'a>) -> Result<Self, DecodeError> {
                from_reader(bytes)
            }

            pub fn encode(&self, bytes: &mut impl BufWriter) {
                to_writer(bytes, self).unwrap()
            }
        }
    };
    (val: $ty:ty) => {
        impl $ty {
            pub fn decode<'a>(
                algebraic_type: &<Self as crate::Value>::Type,
                bytes: &mut impl BufReader<'a>,
            ) -> Result<Self, DecodeError> {
                crate::TypeInSpace::new(&EMPTY_TYPESPACE, algebraic_type).deserialize(Deserializer::new(bytes))
            }

            pub fn encode(&self, bytes: &mut impl BufWriter) {
                to_writer(bytes, self).unwrap()
            }
        }
    };
}

codec_funcs!(crate::AlgebraicType);
codec_funcs!(crate::BuiltinType);
codec_funcs!(crate::ProductType);
codec_funcs!(crate::SumType);
codec_funcs!(crate::ProductTypeElement);
codec_funcs!(crate::SumTypeVariant);

codec_funcs!(val: crate::AlgebraicValue);
codec_funcs!(val: crate::ProductValue);
codec_funcs!(val: crate::SumValue);
codec_funcs!(val: crate::BuiltinValue);