import logging

from app import notification_queue
from data.model.notification import increment_notification_failure_count, reset_number_of_failures_to_zero

from endpoints.notificationmethod import NotificationMethod, InvalidNotificationMethodException
from endpoints.notificationevent import NotificationEvent, InvalidNotificationEventException
from workers.queueworker import QueueWorker, JobException

from data import model
from data.model import InvalidNotificationException

logger = logging.getLogger(__name__)


class NotificationWorker(QueueWorker):
  def process_queue_item(self, job_details):
    notification_uuid = job_details['notification_uuid']

    try:
      notification = model.notification.get_enabled_notification(notification_uuid)
    except InvalidNotificationException:
      return

    event_name = notification.event.name
    method_name = notification.method.name

    try:
      event_handler = NotificationEvent.get_event(event_name)
      method_handler = NotificationMethod.get_method(method_name)
    except InvalidNotificationMethodException as ex:
      logger.exception('Cannot find notification method: %s', ex.message)
      raise JobException('Cannot find notification method: %s' % ex.message)
    except InvalidNotificationEventException as ex:
      logger.exception('Cannot find notification event: %s', ex.message)
      raise JobException('Cannot find notification event: %s' % ex.message)

    if event_handler.should_perform(job_details['event_data'], notification):
      try:
        method_handler.perform(notification, event_handler, job_details)
        reset_number_of_failures_to_zero(notification.id)
      except (JobException, KeyError) as exc:
        increment_notification_failure_count(notification.id)
        raise exc


if __name__ == "__main__":
  worker = NotificationWorker(notification_queue, poll_period_seconds=10, reservation_seconds=30,
                              retry_after_seconds=30)
  worker.start()