"""Parse Douyin IM Response protobuf for conversation metadata."""
from __future__ import annotations


def extract_conv_meta_from_response_bytes(raw: bytes) -> dict[str, dict]:
    """Return {conversation_id: {conversation_short_id, ticket}} from IM API protobuf body."""
    if not raw:
        return {}
    try:
        from .static import Response_pb2 as ResponseProto

        response_proto = ResponseProto.Response()
        response_proto.ParseFromString(raw)
        body = response_proto.body
        out: dict[str, dict] = {}
        for field in (
            "create_conversation_v2_body",
            "get_conversation_info_list_v2_response_body",
        ):
            if not body.HasField(field):
                continue
            conv_body = getattr(body, field)
            for conv in conv_body.conversation_info_list:
                if not conv.conversation_id:
                    continue
                out[conv.conversation_id] = {
                    "conversation_short_id": str(conv.conversation_short_id),
                    "ticket": conv.ticket,
                }
        return out
    except Exception:
        return {}