"""Interface for Cache services."""

from __future__ import annotations

from typing import Any, Optional, Protocol, runtime_checkable


@runtime_checkable
class ICacheService(Protocol):
    """Abstract protocol for the Processing Data Cache Service."""

    def get(self, bucket: str, key: str) -> Any | None:
        """Retrieve data from a specific cache bucket.

        Args:
            bucket: The cache category (e.g., 'topo', 'geol').
            key: Unique key for the parameter set.

        Returns:
            The cached data or None if not found or expired.

        """
        ...

    def set(self, bucket: str, key: str, data: Any, metadata: dict | None = None) -> None:
        """Store data in a specific cache bucket.

        Args:
            bucket: The cache category.
            key: Unique key for the parameter set.
            data: The data to cache.
            metadata: Optional metadata (e.g., TTL, LOD info).

        """
        ...

    def invalidate(self, bucket: str | None = None, key: str | None = None) -> None:
        """Invalidate cache entries.

        Args:
            bucket: If provided, only invalidate this bucket.
            key: If provided, only invalidate this specific key.

        """
        ...

    def clear(self) -> None:
        """Clear the entire cache."""
        ...

    def get_metadata(self, bucket: str, key: str) -> dict[str, Any] | None:
        """Retrieve metadata for a cached entry.

        Args:
            bucket: The cache category.
            key: Unique key for the entry.

        Returns:
            Dictionary containing entry metadata or None if not found.

        """
        ...
