# -*- coding: utf-8 -*-
# Generated by Django 1.11 on 2018-06-12 11:24
from __future__ import unicode_literals
import os
from json import load

from django.db import migrations, models
from django.core import serializers


TMP_FILE = '/tmp/djing_ip_field_devapp_migrate.json'


def device_backup_info(apps, _):
    Device = apps.get_model('devapp', 'Device')
    obs = Device.objects.all()
    with open(TMP_FILE, 'w') as f:
        serializers.serialize('json', obs, stream=f)


def device_restore_info_to_new_scheme(apps, _):
    Device = apps.get_model('devapp', 'Device')
    with open(TMP_FILE, 'r') as f:
        for device in load(f):
            Device.objects.filter(pk=device['pk']).update(ip_address=device['fields']['ip_address'])
    if os.path.isfile(TMP_FILE):
        os.remove(TMP_FILE)


class Migration(migrations.Migration):

    dependencies = [
        ('devapp', '0004_device_extra_data'),
    ]

    operations = [
        migrations.RunPython(device_backup_info),
        migrations.AlterField(
            model_name='device',
            name='ip_address',
            field=models.GenericIPAddressField(blank=True, null=True, protocol='ipv4', verbose_name='Ip address'),
        ),
        migrations.RunPython(device_restore_info_to_new_scheme)
    ]