from django.db.models.signals import post_save, post_delete
from django.dispatch import receiver
from .models import Period

@receiver(post_save, sender=Period)
def student_period_created_updated(sender, instance, created, **kwargs):
    if created and not instance.clocked_out:
        instance.student.is_clocked_in = True
        instance.student.current_period_id = instance.pk
        instance.student.save()
    elif not created and not instance.clocked_out:
        instance.student.is_clocked_in = True
        instance.student.current_period_id = instance.pk
        instance.student.save()
    elif instance.clocked_out and not created:
        instance.student.is_clocked_in = False
        instance.student.save()

@receiver(post_delete, sender=Period)
def student_period_deleted(sender, instance, **kwargs):
    if instance.student.current_period_id == instance.pk:
        instance.student.is_clocked_in = False
        instance.student.current_period_id = None
        instance.student.save()