from allauth.socialaccount.models import SocialAccount
from django.db.models.signals import post_delete, post_save
from django.dispatch import receiver


@receiver(post_save, sender=SocialAccount)
def sync_clipper_on_saving_connection(sender, instance, **kwargs):
    if instance.provider != "clipper":
        return

    # Saving instance makes it the most recently used clipper connection.
    # Always update login_clipper, if value is not the used identifier.

    profile = instance.user.profile

    if profile.login_clipper != instance.uid:
        profile.login_clipper = instance.uid
        profile.save(update_fields=["login_clipper"])


@receiver(post_delete, sender=SocialAccount)
def sync_clipper_on_deleting_connection(sender, instance, **kwargs):
    if instance.provider != "clipper":
        return

    profile = instance.user.profile

    try:
        # Get the most recently used clipper connection. Set its identifier as
        # login_clipper value of the related CofProfile.
        conn = SocialAccount.objects.filter(
            provider="clipper", user=profile.user
        ).latest("last_login")
        if profile.login_clipper != conn.uid:
            profile.login_clipper = conn.uid
            profile.save(update_fields=["login_clipper"])
    except SocialAccount.DoesNotExist:
        # If none lefts, flush it.
        profile.login_clipper = ""
        profile.save(update_fields=["login_clipper"])