// file: kb-lib/tests/external_decoder_api.rs
// version: 1

//! Downstream-style compilation contract for externally implemented decoders.

struct ExternalDecoder;

impl kb_lib::DcApiProtocolDecoder for ExternalDecoder {
    fn decoder_name(&self) -> &'static str {
        return "external_decoder";
    }

    fn decoder_version(&self) -> &'static str {
        return "1";
    }

    fn program_ids(&self) -> &'static [&'static str] {
        return &[];
    }

    fn supports_observation(
        &self,
        _observation: &kb_lib::MdProgramObservation,
    ) -> kb_lib::DcApiDecoderSupport {
        return kb_lib::DcApiDecoderSupport::No;
    }

    fn decode_observation(
        &self,
        _observation: &kb_lib::MdProgramObservation,
    ) -> kb_core::Result<std::vec::Vec<kb_lib::MdDecodedProtocolEvent>> {
        return std::result::Result::Ok(std::vec::Vec::new());
    }
}

#[test]
fn external_decoder_uses_only_the_public_kb_lib_contract() {
    let decoder: &dyn kb_lib::DcApiProtocolDecoder = &ExternalDecoder;
    assert_eq!(decoder.decoder_name(), "external_decoder");
    assert_eq!(decoder.decoder_version(), "1");
    assert!(decoder.program_ids().is_empty());
}