"""
Shows backlog count of ScheduledEmail
"""
from datetime import timedelta
from typing import Any

from django.core.management.base import BaseCommand
from django.utils.timezone import now as timezone_now

from zerver.models import ScheduledEmail


class Command(BaseCommand):
    help = """Shows backlog count of ScheduledEmail
(The number of currently overdue (by at least a minute) email jobs)

This is run as part of the nagios health check for the deliver_scheduled_emails command.

Usage: ./manage.py print_email_delivery_backlog
"""

    def handle(self, *args: Any, **options: Any) -> None:
        print(
            ScheduledEmail.objects.filter(
                scheduled_timestamp__lte=timezone_now() - timedelta(minutes=1)
            ).count()
        )