# -*- coding:utf-8 -*-
from __future__ import unicode_literals

import os
from collections import defaultdict
from distutils.sysconfig import get_python_lib

from django.conf import settings
from django.contrib import admin
from django.core.exceptions import ImproperlyConfigured
from django.db.models.signals import class_prepared
from wenlincms.boot.lazy_admin import LazyAdminSite
from wenlincms.utils.importing import import_dotted_path

# -------------------------- #
# 升级原生django中的一些代码

django_path = os.path.join(get_python_lib(), 'django')
updates_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'updates')


# 获取文件后缀名
def suffix(file, *suffixName):
    array = map(file.endswith, suffixName)
    if True in array:
        return True
    else:
        return False


for root, dirs, files in os.walk(updates_path):
    for tfile in files:
        if not suffix(tfile, '.pyc'):
            f0 = open(os.path.join(root, tfile), 'r')
            content = f0.read()
            f1 = open(os.path.join(root.replace(updates_path, django_path), tfile), 'w')
            f1.write(content)
            f1.close()
            f0.close()
# -------------------------- #
# 升级原生django中的代码结束

# Convert ``EXTRA_MODEL_FIELDS`` into a more usable structure, a
# dictionary mapping module.model paths to dicts of field names mapped
# to field instances to inject, with some sanity checking to ensure
# the field is importable and the arguments given for it are valid.
fields = defaultdict(dict)
for entry in getattr(settings, "EXTRA_MODEL_FIELDS", []):
    model_path, field_name = entry[0].rsplit(".", 1)
    field_path, field_args, field_kwargs = entry[1:]
    if "." not in field_path:
        field_path = "django.db.models.%s" % field_path
    try:
        field_class = import_dotted_path(field_path)
    except ImportError:
        raise ImproperlyConfigured("The EXTRA_MODEL_FIELDS setting contains "
                                   "the field '%s' which could not be "
                                   "imported." % entry[1])
    try:
        field = field_class(*field_args, **field_kwargs)
    except TypeError as e:
        raise ImproperlyConfigured("The EXTRA_MODEL_FIELDS setting contains "
                                   "arguments for the field '%s' which could "
                                   "not be applied: %s" % (entry[1], e))
    fields[model_path][field_name] = field


def add_extra_model_fields(sender, **kwargs):
    """
    Injects custom fields onto the given sender model as defined
    by the ``EXTRA_MODEL_FIELDS`` setting.
    """
    model_path = "%s.%s" % (sender.__module__, sender.__name__)
    for field_name, field in fields.get(model_path, {}).items():
        field.contribute_to_class(sender, field_name)


if fields:
    class_prepared.connect(add_extra_model_fields, dispatch_uid="FQFEQ#rfq3r")

# Override django.contrib.admin.site with LazyAdminSite. It must
# be bound to a separate name (admin_site) for access in autodiscover
# below.

admin_site = LazyAdminSite()
admin.site = admin_site
django_autodiscover = admin.autodiscover


def autodiscover(*args, **kwargs):
    """
    Replaces django's original autodiscover to add a call to
    LazyAdminSite's lazy_registration.
    """
    django_autodiscover(*args, **kwargs)
    admin_site.lazy_registration()


admin.autodiscover = autodiscover
