# -*- coding: utf-8 -*-
from django.utils.functional import SimpleLazyObject

from .models import get_profile


def _get_profile(request):
    if not hasattr(request, '_cached_profile'):
        request._cached_profile = get_profile(request.user)
    return request._cached_profile


class ProfileMiddleware(object):
    def process_request(self, request):
        assert hasattr(request, 'user'), "The Profile middleware requires authentication middleware to be installed. Edit your MIDDLEWARE_CLASSES setting to insert 'django.contrib.auth.middleware.AuthenticationMiddleware'."

        request.profile = SimpleLazyObject(lambda: _get_profile(request))