from django.db import transaction
from django.utils import timezone

from apps.events.models import Registration


@transaction.atomic
def verify_registration_attendance(registration, *, verifier=None, source=None):
    if source is None:
        source = (
            Registration.AttendanceVerificationSource.SYSTEM
            if verifier is None
            else Registration.AttendanceVerificationSource.STAFF_API
        )
    registration.status = Registration.StatusChoices.ATTENDED
    registration.attendance_verified_at = timezone.now()
    registration.attendance_verified_by = verifier
    registration.attendance_verification_source = source
    registration.save(update_fields=[
        "status",
        "attendance_verified_at",
        "attendance_verified_by",
        "attendance_verification_source",
        "updated_at",
    ])
    return registration