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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 KeyValueCreateFailedError
from superset.key_value.models import KeyValueEntry
from superset.key_value.types import Key, KeyValueResource
from superset.utils.core import get_user_id

logger = logging.getLogger(__name__)


class CreateKeyValueCommand(BaseCommand):
    resource: KeyValueResource
    value: Any
    key: Optional[Union[int, UUID]]
    expires_on: Optional[datetime]

    def __init__(
        self,
        resource: KeyValueResource,
        value: Any,
        key: Optional[Union[int, UUID]] = None,
        expires_on: Optional[datetime] = None,
    ):
        """
        Create a new key-value pair

        :param resource: the resource (dashboard, chart etc)
        :param value: the value to persist in the key-value store
        :param key: id of entry (autogenerated if undefined)
        :param expires_on: entry expiration time
        :return: the key associated with the persisted value
        """
        self.resource = resource
        self.value = value
        self.key = key
        self.expires_on = expires_on

    def run(self) -> Key:
        try:
            return self.create()
        except SQLAlchemyError as ex:
            db.session.rollback()
            raise KeyValueCreateFailedError() from ex

    def validate(self) -> None:
        pass

    def create(self) -> Key:
        entry = KeyValueEntry(
            resource=self.resource.value,
            value=pickle.dumps(self.value),
            created_on=datetime.now(),
            created_by_fk=get_user_id(),
            expires_on=self.expires_on,
        )
        if self.key is not None:
            try:
                if isinstance(self.key, UUID):
                    entry.uuid = self.key
                else:
                    entry.id = self.key
            except ValueError as ex:
                raise KeyValueCreateFailedError() from ex
        db.session.add(entry)
        db.session.commit()
        return Key(id=entry.id, uuid=entry.uuid)