# Generated by Django 2.2.6 on 2020-01-27 11:21

from django.db import migrations, models
import random
import string

def eb_number():
    rand_str = "".join([random.choice(list(string.digits)) for i in range(3)])
    return "1{}".format(rand_str)

def set_inventory_number_eb(apps, schema_editor):
    Item = apps.get_model('catalog', 'Item')
    for item in Item.objects.all():
        if item.inventory_number_eb is None:
            inventory_nb = eb_number()
            while Item.objects.filter(inventory_number_eb=inventory_nb).count() > 0:
                inventory_nb = eb_number()
            item.inventory_number_eb = inventory_nb
            item.save()
        else:
            if len(item.inventory_number_eb) == 0:
                inventory_nb = eb_number()
                while Item.objects.filter(inventory_number_eb=inventory_nb).count() > 0:
                    inventory_nb = eb_number()
                item.inventory_number_eb = inventory_nb
                item.save()
        

class Migration(migrations.Migration):

    dependencies = [
        ('catalog', '0042_comment_labelled'),
    ]

    operations = [
        migrations.RunPython(set_inventory_number_eb,
                             reverse_code=migrations.RunPython.noop),
        migrations.AlterField(
            model_name='item',
            name='inventory_number_eb',
            field=models.CharField(db_index=True, max_length=4, unique=True, verbose_name='Inventory number (eb)'),
        ),
    ]