from __future__ import annotations

class ROS2Adapter:
    """Placeholder ROS 2 adapter. In a full implementation, this would connect to the
    ROS 2 middleware, subscribe to topics, and publish local plan updates.
    This stub keeps the architecture surface for integration with real ROS 2.
    """

    def __init__(self, tls_config: dict | None = None) -> None:
        self.tls_config = tls_config or {}

    def publish_signal(self, contract_id: str, signals: dict) -> bool:
        # Placeholder: in a real adapter, publish to a topic.
        return True

    def subscribe_signals(self, contract_id: str) -> dict:
        # Placeholder: return an empty dict as if no signals yet.
        return {}