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#   http://www.apache.org/licenses/LICENSE-2.0
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from typing import Optional

from airflow.models import BaseOperator
from airflow.providers.amazon.aws.hooks.ec2 import EC2Hook
from airflow.utils.decorators import apply_defaults


class EC2StopInstanceOperator(BaseOperator):
    """
    Stop AWS EC2 instance using boto3.

    :param instance_id: id of the AWS EC2 instance
    :type instance_id: str
    :param aws_conn_id: aws connection to use
    :type aws_conn_id: str
    :param region_name: (optional) aws region name associated with the client
    :type region_name: Optional[str]
    :param check_interval: time in seconds that the job should wait in
        between each instance state checks until operation is completed
    :type check_interval: float
    """

    template_fields = ("instance_id", "region_name")
    ui_color = "#eeaa11"
    ui_fgcolor = "#ffffff"

    @apply_defaults
    def __init__(
        self,
        *,
        instance_id: str,
        aws_conn_id: str = "aws_default",
        region_name: Optional[str] = None,
        check_interval: float = 15,
        **kwargs,
    ):
        super().__init__(**kwargs)
        self.instance_id = instance_id
        self.aws_conn_id = aws_conn_id
        self.region_name = region_name
        self.check_interval = check_interval

    def execute(self, context):
        ec2_hook = EC2Hook(aws_conn_id=self.aws_conn_id, region_name=self.region_name)
        self.log.info("Stopping EC2 instance %s", self.instance_id)
        instance = ec2_hook.get_instance(instance_id=self.instance_id)
        instance.stop()
        ec2_hook.wait_for_state(
            instance_id=self.instance_id,
            target_state="stopped",
            check_interval=self.check_interval,
        )