# -*- coding: utf-8 -*-
import django


def autodiscover():
    """
    Auto-discover INSTALLED_APPS translation.py modules and fail silently when
    not present. This forces an import on them to register.
    Also import explicit modules.
    """
    import os
    import sys
    import copy
    from django.conf import settings
    from django.utils.module_loading import module_has_submodule
    from modeltranslation.translator import translator
    from modeltranslation.settings import TRANSLATION_FILES, DEBUG

    if django.VERSION < (1, 7):
        from django.utils.importlib import import_module
        mods = [(app, import_module(app)) for app in settings.INSTALLED_APPS]
    else:
        from importlib import import_module
        from django.apps import apps
        mods = [(app_config.name, app_config.module) for app_config in apps.get_app_configs()]

    for (app, mod) in mods:
        # Attempt to import the app's translation module.
        module = '%s.translation' % app
        before_import_registry = copy.copy(translator._registry)
        try:
            import_module(module)
        except:
            # Reset the model registry to the state before the last import as
            # this import will have to reoccur on the next request and this
            # could raise NotRegistered and AlreadyRegistered exceptions
            translator._registry = before_import_registry

            # Decide whether to bubble up this error. If the app just
            # doesn't have an translation module, we can ignore the error
            # attempting to import it, otherwise we want it to bubble up.
            if module_has_submodule(mod, 'translation'):
                raise

    for module in TRANSLATION_FILES:
        import_module(module)

    # In debug mode, print a list of registered models and pid to stdout.
    # Note: Differing model order is fine, we don't rely on a particular
    # order, as far as base classes are registered before subclasses.
    if DEBUG:
        try:
            if sys.argv[1] in ('runserver', 'runserver_plus'):
                models = translator.get_registered_models()
                names = ', '.join(m.__name__ for m in models)
                print('modeltranslation: Registered %d models for translation'
                      ' (%s) [pid: %d].' % (len(models), names, os.getpid()))
        except IndexError:
            pass


def handle_translation_registrations(*args, **kwargs):
    """
    Ensures that any configuration of the TranslationOption(s) are handled when
    importing modeltranslation.

    This makes it possible for scripts/management commands that affect models
    but know nothing of modeltranslation.
    """
    from modeltranslation.settings import ENABLE_REGISTRATIONS

    if not ENABLE_REGISTRATIONS:
        # If the user really wants to disable this, they can, possibly at their
        # own expense. This is generally only required in cases where other
        # apps generate import errors and requires extra work on the user's
        # part to make things work.
        return

    # Trigger autodiscover, causing any TranslationOption initialization
    # code to execute.
    autodiscover()


if django.VERSION < (1, 7):
    handle_translation_registrations()
