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from airflow.contrib.hooks.aws_sns_hook import AwsSnsHook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults


class SnsPublishOperator(BaseOperator):
    """
    Publish a message to Amazon SNS.

    :param aws_conn_id: aws connection to use
    :type aws_conn_id: str
    :param target_arn: either a TopicArn or an EndpointArn
    :type target_arn: str
    :param message: the default message you want to send (templated)
    :type message: str
    :param subject: the message subject you want to send (templated)
    :type subject: str
    :param message_attributes: the message attributes you want to send as a flat dict (data type will be
        determined automatically)
    :type message_attributes: dict
    """
    template_fields = ['message', 'subject', 'message_attributes']
    template_ext = ()

    @apply_defaults
    def __init__(
            self,
            target_arn,
            message,
            aws_conn_id='aws_default',
            subject=None,
            message_attributes=None,
            *args, **kwargs):
        super(SnsPublishOperator, self).__init__(*args, **kwargs)
        self.target_arn = target_arn
        self.message = message
        self.subject = subject
        self.message_attributes = message_attributes
        self.aws_conn_id = aws_conn_id

    def execute(self, context):
        sns = AwsSnsHook(aws_conn_id=self.aws_conn_id)

        self.log.info(
            'Sending SNS notification to %s using %s:\nsubject=%s\nattributes=%s\nmessage=%s',
            self.target_arn,
            self.aws_conn_id,
            self.subject,
            self.message_attributes,
            self.message,
        )

        return sns.publish_to_target(
            target_arn=self.target_arn,
            message=self.message,
            subject=self.subject,
            message_attributes=self.message_attributes,
        )
