# Path: students/models.py
# class Class(models.Model):
#     CLASS_NUMBERS = (
#         (8, 8),
#         (9, 9),
#         (10, 10),
#         (11, 11),
#         (12, 12),
#     )
#     CLASS_NUMBER_VALIDATORS = [MinValueValidator(8), MaxValueValidator(12)]
# 
#     CLASS_LETTERS = (
#         ('A', 'A'),
#         ('B', 'B'),
#         ('V', 'V'),
#         ('G', 'G'),
#     )
# 
#     number = models.IntegerField(validators=CLASS_NUMBER_VALIDATORS, choices=CLASS_NUMBERS)
#     letter = models.CharField(max_length=1, choices=CLASS_LETTERS)
# 
#     def __str__(self):
#         return '{}{}'.format(self.number, self.letter)
# 
#     class Meta:
#         ordering = ['number', 'letter']
#         verbose_name_plural = 'classes'
# 
# class Subject(models.Model):
#     title = models.CharField(unique=True, max_length=50)
# 
#     def __str__(self):
#         return self.title
# 
#     class Meta:
#         ordering = ['title']
# 
# class Teacher(Account):
#     subject = models.ForeignKey(Subject, related_name='teachers', on_delete=models.CASCADE)
# 
#     def __str__(self):
#         return '{} ({})'.format(self.user.username, self.subject)
# 
# Path: exams/validators.py
# def validate_date(date):
#     if date < datetime.now().date():
#         raise ValidationError('Only future dates allowed.')
#     if date.weekday() not in range(0, 5):
#         raise ValidationError('Weekend days are not valid.')


from django.db import models
from students.models import Class, Subject, Teacher
from .validators import validate_date




class Exam(models.Model):
    subject = models.ForeignKey(Subject, on_delete=models.CASCADE)
    date = models.DateField(auto_now=False, validators=[validate_date])
    clazz = models.ForeignKey(Class, on_delete=models.CASCADE)
    topic = models.CharField(max_length=60)
    details = models.TextField(max_length=10000, blank=True)

# Path: students/models.py
# class Class(models.Model):
#     CLASS_NUMBERS = (
#         (8, 8),
#         (9, 9),
#         (10, 10),
#         (11, 11),
#         (12, 12),
#     )
#     CLASS_NUMBER_VALIDATORS = [MinValueValidator(8), MaxValueValidator(12)]
# 
#     CLASS_LETTERS = (
#         ('A', 'A'),
#         ('B', 'B'),
#         ('V', 'V'),
#         ('G', 'G'),
#     )
# 
#     number = models.IntegerField(validators=CLASS_NUMBER_VALIDATORS, choices=CLASS_NUMBERS)
#     letter = models.CharField(max_length=1, choices=CLASS_LETTERS)
# 
#     def __str__(self):
#         return '{}{}'.format(self.number, self.letter)
# 
#     class Meta:
#         ordering = ['number', 'letter']
#         verbose_name_plural = 'classes'
# 
# class Subject(models.Model):
#     title = models.CharField(unique=True, max_length=50)
# 
#     def __str__(self):
#         return self.title
# 
#     class Meta:
#         ordering = ['title']
# 
# class Teacher(Account):
#     subject = models.ForeignKey(Subject, related_name='teachers', on_delete=models.CASCADE)
# 
#     def __str__(self):
#         return '{} ({})'.format(self.user.username, self.subject)
# 
# Path: exams/validators.py
# def validate_date(date):
#     if date < datetime.now().date():
#         raise ValidationError('Only future dates allowed.')
#     if date.weekday() not in range(0, 5):
#         raise ValidationError('Weekend days are not valid.')


# Path: exams/models.py
from django.db import models
from students.models import Class, Subject, Teacher
from .validators import validate_date





class Exam(models.Model):
    subject = models.ForeignKey(Subject, on_delete=models.CASCADE)
    date = models.DateField(auto_now=False, validators=[validate_date])
    clazz = models.ForeignKey(Class, on_delete=models.CASCADE)
    topic = models.CharField(max_length=60)
    details = models.TextField(max_length=10000, blank=True)

    author = models.ForeignKey(Teacher, null=True, related_name='exams', on_delete=models.CASCADE)