import datetime

from flask import abort
from ..examination_schedule.models import ExaminationSchedule


def check_the_enrollments_has_just_started(es: ExaminationSchedule) -> None:
    now = datetime.datetime.utcnow()
    if es.start_date is None or es.end_date is None or not (es.start_date < now < es.end_date):
        abort(403, "Forbidden! Enrollment hasn't started yet.")