from celery import shared_task
from django.utils import timezone
from django.conf import settings
from .models import MemberWaitingList, Freizeit

@shared_task
def ask_for_waiting_confirmation():
    reminder_cutoff = timezone.now() - timezone.timedelta(days=settings.CONFIRMATION_REMINDER_FREQUENCY)
    cutoff = timezone.now() - timezone.timedelta(days=settings.WAITING_CONFIRMATION_FREQUENCY)
    no = 0
    # we ask all waiters for wait confirmation whose last confirmed waiting status is at least
    # settings.WAITING_CONFIRMATION_FREQUENCY days ago, who have not received a reminder
    # in the last settings.CONFIRMATION_REMINDER_FREQUENCY days and
    # who have yet received strictly less reminders then settings.MAX_REMINDER_COUNT.
    for waiter in MemberWaitingList.objects.filter(last_wait_confirmation__lte=cutoff,
                                                   last_reminder__lte=reminder_cutoff,
                                                   sent_reminders__lt=settings.MAX_REMINDER_COUNT):
        waiter.ask_for_wait_confirmation()
        no += 1
    return no


@shared_task
def send_crisis_intervention_list():
    """
    Send crisis intervention lists for all excursions that start on the current day and
    that have not been sent yet.
    """
    no = 0
    for excursion in Freizeit.objects.filter(date__date=timezone.now().date(),
                                             crisis_intervention_list_sent=False):
        excursion.send_crisis_intervention_list()
        no += 1
    return no


@shared_task
def send_notification_crisis_intervention_list():
    """
    Send crisis intervention list notifiactions for all excursions that start on the next
    day and that have not been sent yet.
    """
    no = 0
    for excursion in Freizeit.objects.filter(date__date=timezone.now().date() + timezone.timedelta(days=1),
                                             notification_crisis_intervention_list_sent=False):
        excursion.notify_leaders_crisis_intervention_list()
        no += 1
    return no