from django.db import models
from django.contrib.auth.models import User, Group
from django.db.models.signals import post_save
from django.urls import reverse
from django.dispatch import receiver


class SchoolProfile(models.Model):
    """Ajoute un champ pour distinguer les groupes écoles des autres."""
    group = models.OneToOneField(
        Group,
        on_delete=models.CASCADE,
        related_name="students"
    )

    def __str__(self):
        return self.group.name

    def get_absolute_url(self):
        return reverse("users:school", kwargs={'pk':self.pk})

class UserProfile(models.Model):
    """Profil d'un utilisateur"""
    school = models.ForeignKey(SchoolProfile, on_delete=models.SET_NULL, null=True, blank=True)
    user = models.OneToOneField(User, on_delete=models.CASCADE)


@receiver(post_save, sender=UserProfile)
def update_groups(sender, instance, **kwargs):
    instance.user.groups.add(instance.school.group)