from celery.signals import worker_process_shutdown
from flask import current_app
from notifications_utils.recipients import InvalidEmailError
from notifications_utils.statsd_decorators import statsd
from sqlalchemy.orm.exc import NoResultFound

from app import notify_celery
from app.config import QueueNames
from app.dao import notifications_dao
from app.dao.notifications_dao import update_notification_status_by_id
from app.delivery import send_to_providers
from app.exceptions import NotificationTechnicalFailureException
from app.models import NOTIFICATION_TECHNICAL_FAILURE


@worker_process_shutdown.connect
def worker_process_shutdown(sender, signal, pid, exitcode):
    current_app.logger.info('Provider worker shutdown: PID: {} Exitcode: {}'.format(pid, exitcode))


@notify_celery.task(bind=True, name="deliver_sms", max_retries=48, default_retry_delay=300)
@statsd(namespace="tasks")
def deliver_sms(self, notification_id):
    try:
        current_app.logger.info("Start sending SMS for notification id: {}".format(notification_id))
        notification = notifications_dao.get_notification_by_id(notification_id)
        if not notification:
            raise NoResultFound()
        send_to_providers.send_sms_to_provider(notification)
    except Exception as e:
        try:
            current_app.logger.exception(
                "SMS notification delivery for id: {} failed".format(notification_id), e
            )
            self.retry(queue=QueueNames.RETRY)
        except self.MaxRetriesExceededError:
            message = "RETRY FAILED: Max retries reached. The task send_sms_to_provider failed for notification {}. " \
                      "Notification has been updated to technical-failure".format(notification_id)
            update_notification_status_by_id(notification_id, NOTIFICATION_TECHNICAL_FAILURE)
            raise NotificationTechnicalFailureException(message)


@notify_celery.task(bind=True, name="deliver_email", max_retries=48, default_retry_delay=300)
@statsd(namespace="tasks")
def deliver_email(self, notification_id):
    try:
        current_app.logger.info("Start sending email for notification id: {}".format(notification_id))
        notification = notifications_dao.get_notification_by_id(notification_id)
        if not notification:
            raise NoResultFound()
        send_to_providers.send_email_to_provider(notification)
    except InvalidEmailError as e:
        current_app.logger.exception(e)
        update_notification_status_by_id(notification_id, 'technical-failure')
    except Exception as e:
        try:
            current_app.logger.exception(
                "RETRY: Email notification {} failed".format(notification_id), e
            )
            self.retry(queue=QueueNames.RETRY)
        except self.MaxRetriesExceededError:
            message = "RETRY FAILED: Max retries reached. " \
                      "The task send_email_to_provider failed for notification {}. " \
                      "Notification has been updated to technical-failure".format(notification_id)
            update_notification_status_by_id(notification_id, NOTIFICATION_TECHNICAL_FAILURE)
            raise NotificationTechnicalFailureException(message)