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"""This module contains AWS CloudFormation Hook"""
from typing import Optional, Union

from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
from boto3 import client, resource
from botocore.exceptions import ClientError


class AWSCloudFormationHook(AwsBaseHook):
    """
    Interact with AWS CloudFormation.

    Additional arguments (such as ``aws_conn_id``) may be specified and
    are passed down to the underlying AwsBaseHook.

    .. seealso::
        :class:`~airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook`
    """

    def __init__(self, *args, **kwargs):
        super().__init__(client_type="cloudformation", *args, **kwargs)

    def get_stack_status(self, stack_name: Union[client, resource]) -> Optional[dict]:
        """Get stack status from CloudFormation."""
        self.log.info("Poking for stack %s", stack_name)

        try:
            stacks = self.get_conn().describe_stacks(StackName=stack_name)["Stacks"]
            return stacks[0]["StackStatus"]
        except ClientError as e:
            if "does not exist" in str(e):
                return None
            else:
                raise e

    def create_stack(self, stack_name: str, params: dict) -> None:
        """
        Create stack in CloudFormation.

        :param stack_name: stack_name.
        :type stack_name: str
        :param params: parameters to be passed to CloudFormation.
        :type params: dict
        """
        if "StackName" not in params:
            params["StackName"] = stack_name
        self.get_conn().create_stack(**params)

    def delete_stack(self, stack_name: str, params: Optional[dict] = None) -> None:
        """
        Delete stack in CloudFormation.

        :param stack_name: stack_name.
        :type stack_name: str
        :param params: parameters to be passed to CloudFormation (optional).
        :type params: dict
        """
        params = params or {}
        if "StackName" not in params:
            params["StackName"] = stack_name
        self.get_conn().delete_stack(**params)