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

from django.core.exceptions import ValidationError

from djconfig import config


class KFetConfig(object):
    """kfet app configuration.

    Enhance isolation with backend used to store config.
    Usable after DjConfig middleware was called.

    """
    prefix = 'kfet_'

    def __getattr__(self, key):
        return getattr(config, self.get_dj_key(key))

    def list(self):
        from kfet.forms import KFetConfigForm
        return [(field.label, getattr(config, name), )
                for name, field in KFetConfigForm.base_fields.items()]

    def get_dj_key(self, key):
        return '{}{}'.format(self.prefix, key)

    def set_many(self, **kwargs):
        from kfet.forms import KFetConfigForm
        new_cfg = KFetConfigForm().initial
        new_cfg.update({self.get_dj_key(key): value
                        for key, value in kwargs.items()})
        cfg_form = KFetConfigForm(new_cfg)
        if cfg_form.is_valid():
            cfg_form.save()
        else:
            raise ValidationError()


kfet_config = KFetConfig()