import logging

from APIFactory import URIBuilder

from types import *
from notifications import *
from utils import *


__author__ = 'hanl'

# instance reference for authentication provider
# must be set before usage!
PROVIDER = None


def init_app(config):
    provider_name = config.get('AUTH_PROVIDER', 'providers.CustomProvider')
    split = provider_name.split('.')
    # get last element, so you have the class name
    _class = split[len(split) - 1]

    provider_name = provider_name.replace("." + _class, "")
    module = __import__(provider_name)
    obj = getattr(module, _class, None)
    if obj is None:
        raise KeyError("the provider class '%s.%s' is undefined or could not be found!" % (provider_name, _class))
    instance = obj(config)
    logging.info("successfully loaded provider '%s.%s'" % (provider_name, _class))
    global PROVIDER
    PROVIDER = instance