from django.db import models
from django.contrib.auth.models import User
import uuid

# Create your models here.

class Invitation(models.Model):
    token = models.UUIDField(default=uuid.uuid4, unique=True, editable=False)
    created_by = models.ForeignKey(User, on_delete=models.CASCADE, related_name='created_invitations')
    created_at = models.DateTimeField(auto_now_add=True)
    expires_at = models.DateTimeField()
    used_at = models.DateTimeField(null=True, blank=True)

    @property
    def is_valid(self):
        from django.utils import timezone
        return self.used_at is None and self.expires_at > timezone.now()