"""
Aliases for helpers that newer Django versions removed.

The unmaintained aldryn-* packages (and similar) still import them. Imported
first thing from the settings, before any app code is loaded.
"""
import django.utils.encoding
import django.utils.translation

if not hasattr(django.utils.encoding, 'python_2_unicode_compatible'):
    django.utils.encoding.python_2_unicode_compatible = lambda cls: cls

for _name in ('gettext', 'gettext_lazy', 'gettext_noop',
              'ngettext', 'ngettext_lazy'):
    if not hasattr(django.utils.translation, 'u' + _name):
        setattr(django.utils.translation, 'u' + _name,
                getattr(django.utils.translation, _name))

import sys

import six
from django.conf import urls
from django.db import models
from django.http import HttpRequest
from django.urls import re_path
from django.utils import encoding

for _name, _target in (('force_text', 'force_str'), ('smart_text', 'smart_str'),
                       ('force_unicode', 'force_str')):
    if not hasattr(encoding, _name):
        setattr(encoding, _name, getattr(encoding, _target))

if not hasattr(urls, 'url'):
    urls.url = re_path

if 'django.utils.six' not in sys.modules:
    import django.utils
    django.utils.six = six
    sys.modules['django.utils.six'] = six
    sys.modules['django.utils.six.moves'] = six.moves

if not hasattr(models, 'NullBooleanField'):
    class NullBooleanField(models.BooleanField):
        def __init__(self, *args, **kwargs):
            kwargs['null'] = True
            kwargs['blank'] = True
            super().__init__(*args, **kwargs)

        def deconstruct(self):
            name, path, args, kwargs = super().deconstruct()
            del kwargs['null'], kwargs['blank']
            return name, path, args, kwargs

    models.NullBooleanField = NullBooleanField

if not hasattr(HttpRequest, 'is_ajax'):
    HttpRequest.is_ajax = lambda self: self.headers.get('x-requested-with') == 'XMLHttpRequest'