from django.db import models


class Exam(models.Model):
    code = models.CharField(max_length=32)
    credits = models.IntegerField(default=0)
    employee_only = models.BooleanField(default=False)
    published = models.BooleanField(default=False)
    certificate_short_name = models.CharField(
        max_length=255,
        null=True,
        blank=True,
        help_text="The short name of the certificate type to issue when the exam is passed",
    )
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        db_table = "exams"

    def to_frontend_detail(self) -> dict:
        return {
            "id": self.id,
            "code": self.code,
            "credits": self.credits,
            "employee_only": self.employee_only,
            "variants": [
                v.to_frontend_detail() for v in self.variants.all()
            ],
        }