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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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from typing import Dict

from airflow.models import BaseOperator
from airflow.providers.redis.hooks.redis import RedisHook
from airflow.utils.decorators import apply_defaults


class RedisPublishOperator(BaseOperator):
    """
    Publish a message to Redis.

    :param channel: redis channel to which the message is published (templated)
    :type channel: str
    :param message: the message to publish (templated)
    :type message: str
    :param redis_conn_id: redis connection to use
    :type redis_conn_id: str
    """

    template_fields = ("channel", "message")

    @apply_defaults
    def __init__(
        self,
        *,
        channel: str,
        message: str,
        redis_conn_id: str = "redis_default",
        **kwargs
    ) -> None:

        super().__init__(**kwargs)
        self.redis_conn_id = redis_conn_id
        self.channel = channel
        self.message = message

    def execute(self, context: Dict) -> None:
        """
        Publish the message to Redis channel

        :param context: the context object
        :type context: dict
        """
        redis_hook = RedisHook(redis_conn_id=self.redis_conn_id)

        self.log.info(
            "Sending message %s to Redis on channel %s", self.message, self.channel
        )

        result = redis_hook.get_conn().publish(
            channel=self.channel, message=self.message
        )

        self.log.info("Result of publishing %s", result)