from __future__ import annotations

from abc import ABC, abstractmethod

from ..models import CheckResult


class Check(ABC):
    """Base class for all HA diagnostic checks."""

    name: str  # unique slug used in /trigger/<name> and check_history

    @abstractmethod
    async def run(self) -> list[CheckResult]:
        """Execute the check and return results.

        Empty list means the check passed cleanly.
        Each CheckResult with event_type set causes an event to be emitted.
        The caller (runner in main.py) handles emission and history recording.
        """