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

__author__ = "Nicolas Richart"
__copyright__ = "Copyright (C) 2016, EPFL (Ecole Polytechnique Fédérale " \
                "de Lausanne) - SCITAS (Scientific IT and Application " \
                "Support)"
__credits__ = ["Nicolas Richart"]
__license__ = "BSD"
__version__ = "0.1"
__maintainer__ = "Nicolas Richart"
__email__ = "nicolas.richart@epfl.ch"

_logger = logging.getLogger(__name__)

__repo_backends = {}


def _register_backend(name, backends):
    __repo_backends[name] = backends


def _get_class(_type, backend):
    if not backend or backend not in __repo_backends:
        _logger.error("{0} not a known backend".format(backend))
        raise TypeError("{0} not a known backend".format(backend))

    if _type not in __repo_backends[backend]:
        _logger.error(("{0} is not a known type for the " +
                       "backend {1}").format(_type, backend))
        raise TypeError(("{0} is not a known type for the " +
                         "backend {1}").format(_type, backend))

    module_info = __repo_backends[backend][_type]

    _logger.debug("Importing module {0}".format(module_info['module']))
    module = __import__('getmystuph.' + module_info['module'],
                        globals(),
                        locals(),
                        [module_info['class']], 0)

    _class = getattr(module, module_info['class'])
    return _class