# -*- coding: utf-8 -*-
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

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
    """
    template_fields = ['message']
    template_ext = ()

    @apply_defaults
    def __init__(
            self,
            target_arn,
            message,
            aws_conn_id='aws_default',
            *args, **kwargs):
        super(SnsPublishOperator, self).__init__(*args, **kwargs)
        self.target_arn = target_arn
        self.message = message
        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 {} using {}:\n{}'.format(
                self.target_arn,
                self.aws_conn_id,
                self.message
            )
        )

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