"""Dynaconf django extension

In the `django_project/settings.py` put at the very botton of the file:

# HERE STARTS DYNACONF EXTENSION LOAD (Keep at the very bottom of settings.py)

# Read more at https://dynaconf.readthedocs.io/en/latest/guides/django.html

import dynaconf  # noqa

settings = dynaconf.DjangoDynaconf(__name__)  # noqa

# HERE ENDS DYNACONF EXTENSION LOAD (No more code below this line)

Now in the root of your Django project

(the same folder where manage.py is located)

Put your config files `settings.{py|yaml|toml|ini|json}`

and or `.secrets.{py|yaml|toml|ini|json}`

On your projects root folder now you can start as::

    DJANGO_DEBUG='false' \

    DJANGO_ALLOWED_HOSTS='["localhost"]' \

    python manage.py runserver

"""

try:  # pragma: no cover

    from django import conf

    from django.conf import settings as django_settings

    django_installed = True

except ImportError:  # pragma: no cover

    django_installed = False

def load(django_settings_module_name=None, **kwargs):  # pragma: no cover

    if not django_installed:

        raise RuntimeError(

            "To use this extension django must be installed "

            "install it with: pip install django"

        )

    try:

        django_settings_module = sys.modules[django_settings_module_name]

    except KeyError:

        django_settings_module = sys.modules[

            os.environ["DJANGO_SETTINGS_MODULE"]

        ]

    settings_file = os.path.abspath(django_settings_module.__file__)

    _root_path = os.path.dirname(settings_file)

    # 1) Create the lazy settings object reusing settings_module consts

    options = {

        k: v for k, v in django_settings_module.__dict__.items() if k.isupper()

    }

    options.update(kwargs)

    options.setdefault(

        "SKIP_FILES_FOR_DYNACONF", [settings_file, "dynaconf_merge"]

    )

    options.setdefault("ROOT_PATH_FOR_DYNACONF", _root_path)

    options.setdefault("ENVVAR_PREFIX_FOR_DYNACONF", "DJANGO")

    options.setdefault("ENV_SWITCHER_FOR_DYNACONF", "DJANGO_ENV")

    options.setdefault("ENVIRONMENTS_FOR_DYNACONF", True)

    options.setdefault("load_dotenv", True)

    options.setdefault(

        "default_settings_paths", dynaconf.DEFAULT_SETTINGS_FILES

    )

    lazy_settings = dynaconf.LazySettings(**options)

    dynaconf.settings = lazy_settings  # rebind the settings

    # 2) Set all settings back to django_settings_module for 'django check'

    lazy_settings.populate_obj(django_settings_module)

    # 3) Bind `settings` and `DYNACONF`

    setattr(django_settings_module, "settings", lazy_settings)

    setattr(django_settings_module, "DYNACONF", lazy_settings)

    # 4) keep django original settings

    dj = {}

    for key in dir(django_settings):

        if (

            key.isupper()

            and (key != "SETTINGS_MODULE")

            and key not in lazy_settings.store

        ):

            dj[key] = getattr(django_settings, key, None)

        dj["ORIGINAL_SETTINGS_MODULE"] = django_settings.SETTINGS_MODULE

    lazy_settings.update(dj)

    # 5) Patch django.conf.settings

    class Wrapper(object):

        # lazy_settings = conf.settings.lazy_settings

        def __getattribute__(self, name):

            if name == "settings":

                return lazy_settings

            else:

                return getattr(conf, name)

    # This implementation is recommended by Guido Van Rossum

    # https://mail.python.org/pipermail/python-ideas/2012-May/014969.html

    sys.modules["django.conf"] = Wrapper()

    # 6) Enable standalone scripts to use Dynaconf

    # This is for when `django.conf.settings` is imported directly

    # on external `scripts` (out of Django's lifetime)

    for stack_item in reversed(inspect.stack()):

        if isinstance(

            stack_item.frame.f_globals.get("settings"), conf.LazySettings

        ):

            stack_item.frame.f_globals["settings"] = lazy_settings

    return lazy_settings

# syntax sugar