# -*- coding: utf-8 -*-

from __future__ import absolute_import, unicode_literals
import sys
from importlib import import_module

from django.core.exceptions import ImproperlyConfigured
from django.conf import settings
from django.core.cache.backends.base import get_key_func
from django.utils.encoding import smart_bytes, smart_text

from redis import ConnectionPool as RedisConnectionPool
from redis.connection import UnixDomainSocketConnection, Connection
from redis.connection import DefaultParser

from collections import defaultdict

if sys.version_info[0] < 3:
    integer_types = (int, long,)
else:
    integer_types = (int,)


class CacheKey(str):
    """
    A stub string class that we can use to check if a key was created already.
    """
    def __init__(self, key):
        self._key = key

    if sys.version_info[0] < 3:
        def __str__(self):
            return smart_bytes(self._key)

        def __unicode__(self):
            return smart_text(self._key)

    else:
        def __str__(self):
            return smart_text(self._key)

    def original_key(self):
        key = self._key.rsplit(":", 1)[1]
        return key


def load_class(path):
    """
    Loads class from path.
    """

    mod_name, klass_name = path.rsplit('.', 1)

    try:
        mod = import_module(mod_name)
    except AttributeError as e:
        raise ImproperlyConfigured('Error importing {0}: "{1}"'.format(mod_name, e))

    try:
        klass = getattr(mod, klass_name)
    except AttributeError:
        raise ImproperlyConfigured('Module "{0}" does not define a "{1}" class'.format(mod_name, klass_name))

    return klass

def default_reverse_key(key):
    return key.split(':', 2)[2]