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import datetime

from airflow.sensors.base import BaseSensorOperator
from airflow.triggers.temporal import DateTimeTrigger
from airflow.utils import timezone
from airflow.utils.context import Context


class TimeSensor(BaseSensorOperator):
    """
    Waits until the specified time of the day.

    :param target_time: time after which the job succeeds
    """

    def __init__(self, *, target_time, **kwargs):
        super().__init__(**kwargs)
        self.target_time = target_time

    def poke(self, context: Context):
        self.log.info('Checking if the time (%s) has come', self.target_time)
        return timezone.make_naive(timezone.utcnow(), self.dag.timezone).time() > self.target_time


class TimeSensorAsync(BaseSensorOperator):
    """
    Waits until the specified time of the day, freeing up a worker slot while
    it is waiting.

    :param target_time: time after which the job succeeds
    """

    def __init__(self, *, target_time, **kwargs):
        super().__init__(**kwargs)
        self.target_time = target_time

        self.target_datetime = timezone.coerce_datetime(
            datetime.datetime.combine(datetime.datetime.today(), self.target_time)
        )

    def execute(self, context: Context):
        self.defer(
            trigger=DateTimeTrigger(moment=self.target_datetime),
            method_name="execute_complete",
        )

    def execute_complete(self, context, event=None):
        """Callback for when the trigger fires - returns immediately."""
        return None
