"""EC2 runtime adapter — stub for Plan 02."""

from __future__ import annotations

from .base import RuntimeAdapter


class EC2Runtime(RuntimeAdapter):
    """EC2 Spot instance runtime adapter.

    Full implementation in Plan 02.
    """

    def __init__(self, region: str, launch_template_id: str, **kwargs: object) -> None:
        self._region = region
        self._launch_template_id = launch_template_id

    def launch_spot(self, slot_id: str, user_data: str) -> str:
        """Launch a spot instance for slot_id."""
        raise NotImplementedError

    def describe_instance(self, instance_id: str) -> dict:
        """Return normalized instance info."""
        raise NotImplementedError

    def terminate_instance(self, instance_id: str) -> None:
        """Terminate the instance."""
        raise NotImplementedError

    def list_managed_instances(self) -> list[dict]:
        """Return list of managed instances."""
        raise NotImplementedError