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#
#   http://www.apache.org/licenses/LICENSE-2.0
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import logging
from typing import 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 KeyValueDeleteFailedError
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 DeleteKeyValueCommand(BaseCommand):
    key: Union[int, UUID]
    resource: KeyValueResource

    def __init__(self, resource: KeyValueResource, key: Union[int, UUID]):
        """
        Delete a key-value pair

        :param resource: the resource (dashboard, chart etc)
        :param key: the key to delete
        :return: was the entry deleted or not
        """
        self.resource = resource
        self.key = key

    def run(self) -> bool:
        try:
            return self.delete()
        except SQLAlchemyError as ex:
            db.session.rollback()
            logger.exception("Error running delete command")
            raise KeyValueDeleteFailedError() from ex

    def validate(self) -> None:
        pass

    def delete(self) -> bool:
        filter_ = get_filter(self.resource, self.key)
        entry = (
            db.session.query(KeyValueEntry)
            .filter_by(**filter_)
            .autoflush(False)
            .first()
        )
        if entry:
            db.session.delete(entry)
            db.session.commit()
            return True
        return False