use super::BinarySource;
use super::Embeddable;
use super::IOResult;
use super::IOValue;
use super::Reader;
use super::packed::PackedReader;

pub trait DomainDecode<D: Embeddable> {
    fn decode_embedded<'de, 'src, S: BinarySource<'de>>(
        &mut self,
        src: &'src mut S,
        read_annotations: bool,
    ) -> IOResult<D>;
}

pub struct IOValueDomainDecode;

impl DomainDecode<IOValue> for IOValueDomainDecode {
    fn decode_embedded<'de, 'src, S: BinarySource<'de>>(
        &mut self,
        src: &'src mut S,
        read_annotations: bool,
    ) -> IOResult<IOValue> {
        PackedReader::new(src, IOValueDomainDecode).demand_next(read_annotations)
    }
}

pub struct NoEmbeddedDomainDecode;

impl<D: Embeddable> DomainDecode<D> for NoEmbeddedDomainDecode {
    fn decode_embedded<'de, 'src, S: BinarySource<'de>>(
        &mut self,
        _src: &'src mut S,
        _read_annotations: bool,
    ) -> IOResult<D> {
        Err(std::io::Error::new(std::io::ErrorKind::Unsupported, "Embedded values not supported here"))
    }
}