# Generated by Django 4.2.7 on 2025-12-19 08:59

from django.db import migrations
from decimal import Decimal


def populate_price_per_student(apps, schema_editor):
    """Заполняем price_per_student из существующих total_price и min_students."""
    BulkDiscount = apps.get_model('subscriptions', 'BulkDiscount')
    
    for discount in BulkDiscount.objects.all():
        if discount.total_price and discount.min_students:
            discount.price_per_student = discount.total_price / Decimal(str(discount.min_students))
            discount.save()


def reverse_populate_price_per_student(apps, schema_editor):
    """Обратная операция - очищаем price_per_student."""
    BulkDiscount = apps.get_model('subscriptions', 'BulkDiscount')
    BulkDiscount.objects.all().update(price_per_student=None)


class Migration(migrations.Migration):

    dependencies = [
        ('subscriptions', '0004_add_price_per_student_to_bulk_discount'),
    ]

    operations = [
        migrations.RunPython(populate_price_per_student, reverse_populate_price_per_student),
    ]