"""
notification models file
"""
# django imports
from django.db import models
from django.contrib.auth import get_user_model
from django.utils import timezone

USER = get_user_model()


class Notification(models.Model):
    """ used to save the notifications """
    notification_type = models.CharField(max_length=50, blank=True, null=True)
    notification_to = models.ForeignKey(USER, related_name='to_notification', on_delete=models.CASCADE)
    notification_from = models.ForeignKey(USER, related_name='from_notification', on_delete=models.SET_NULL,
                                          blank=True, null=True)
    data = models.JSONField(default=dict, blank=True, null=True)
    is_read = models.BooleanField(default=False)
    created_at = models.DateTimeField(default=timezone.now)

    def __str__(self):
        """ string representation """
        return f"{self.notification_to.id} | {self.notification_to.email}"