from datetime import UTC, datetime
from typing import Any

from app.core.contracts import RequestContext
from app.core.errors import ResourceNotFoundError
from app.service.authorization_service import AuthorizationService


class KnowledgeReferenceService:
    async def resolve(self, context: RequestContext, token: str) -> dict[str, Any]:
        await AuthorizationService.require(context, "knowledge:reference:read")
        pieces = token.split(".")
        if len(pieces) != 5 or pieces[0] != "kr1" or pieces[1] != context.user_id:
            raise ResourceNotFoundError("引用不存在")
        try:
            if int(pieces[3]) < int(datetime.now(UTC).timestamp()):
                raise ResourceNotFoundError("引用不存在")
        except ValueError as exc:
            raise ResourceNotFoundError("引用不存在") from exc
        raise ResourceNotFoundError("引用不存在")