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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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import logging
import pickle
from datetime import datetime
from typing import Any, Optional, Union
from uuid import UUID

from sqlalchemy.exc import SQLAlchemyError

from superset import db
from superset.commands.base import BaseCommand
from superset.key_value.exceptions import KeyValueGetFailedError
from superset.key_value.models import KeyValueEntry
from superset.key_value.types import KeyValueResource
from superset.key_value.utils import get_filter

logger = logging.getLogger(__name__)


class GetKeyValueCommand(BaseCommand):
    resource: KeyValueResource
    key: Union[int, UUID]

    def __init__(self, resource: KeyValueResource, key: Union[int, UUID]):
        """
        Retrieve a key value entry

        :param resource: the resource (dashboard, chart etc)
        :param key: the key to retrieve
        :return: the value associated with the key if present
        """
        self.resource = resource
        self.key = key

    def run(self) -> Any:
        try:
            return self.get()
        except SQLAlchemyError as ex:
            raise KeyValueGetFailedError() from ex

    def validate(self) -> None:
        pass

    def get(self) -> Optional[Any]:
        filter_ = get_filter(self.resource, self.key)
        entry = (
            db.session.query(KeyValueEntry)
            .filter_by(**filter_)
            .autoflush(False)
            .first()
        )
        if entry and (entry.expires_on is None or entry.expires_on > datetime.now()):
            return pickle.loads(entry.value)
        return None