class Visitor(models.Model):
    visitor_id = models.AutoField(primary_key=True)
    first_name = models.CharField(max_length=50 , blank=False, null=True)
    last_name = models.CharField(max_length=50 , blank=False, null=True)
    email = models.EmailField(unique=True, max_length=50, blank=False)
    company = models.CharField(max_length=50, blank=False)
    phone_number = models.CharField(unique=True, max_length=100, blank=False)
    picture_url = models.ImageField(upload_to='pictures/%Y/%m/%d/', max_length=254, blank=True, default='none', null=True)
    blacklist = models.BooleanField(default=False)

    def __str__(self):
        return '{} {}'.format(self.first_name, self.last_name)


class VisitorMeeting(models.Model):
    visitor_id = models.ForeignKey(Visitor, on_delete=models.CASCADE)
    meeting_id = models.ForeignKey(Meeting, on_delete=models.CASCADE, related_name='visitors')
    arrival = models.DateTimeField(blank=True, null=True)
    departure = models.DateTimeField(blank=True, null=True)
    checkin_status = models.BooleanField(default=False, null=True)

    objects = VisitorQuerySet.as_manager()

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        send_mail(email=self.visitor_id.email, message='You have meeting which starts  {} and ends {}'.format(self.meeting_id__start_time,
        self.meeting_id.end_time))