# Copyright 2026 Alibaba Group Holding Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Extension-related reads from persisted workload metadata (separate from core lifecycle API)."""

from __future__ import annotations

from abc import ABC, abstractmethod
from typing import TYPE_CHECKING, Optional

if TYPE_CHECKING:
    from opensandbox_server.services.sandbox_service import SandboxService


class ExtensionService(ABC):
    """Workload extension metadata reads; kept off ``SandboxService`` lifecycle surface."""

    @abstractmethod
    def get_access_renew_extend_seconds(self, sandbox_id: str) -> Optional[int]:
        """Seconds from workload metadata for access-driven renew, or None if missing/invalid."""
        pass


def require_extension_service(sandbox_service: "SandboxService") -> ExtensionService:
    """Assert the runtime sandbox service also implements ExtensionService (Docker/K8s do)."""
    if isinstance(sandbox_service, ExtensionService):
        return sandbox_service
    raise TypeError(
        f"{type(sandbox_service).__name__} must implement ExtensionService for renew-intent"
    )