from django.db import models
from accounts.models import Student

class Code(models.Model):
    student = models.ForeignKey(Student, on_delete=models.CASCADE)
    qr_code = models.ImageField(upload_to='qr_codes', blank=True)

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

class Period(models.Model):
    student = models.ForeignKey(Student, on_delete=models.CASCADE)
    clocked_in = models.DateTimeField(auto_now_add=True)
    clocked_out = models.DateTimeField(blank=True, null=True)

    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)

    def duration(self):
        return round(self.clocked_out - self.clocked_in)

    def __str__(self):
        return f'{self.clocked_in}: {self.student.user.first_name} {self.student.user.last_name}'