# -*- coding: utf-8 -*-
from django.utils.functional import SimpleLazyObject
from django.contrib.auth.views import logout as django_logout
from django.contrib import messages

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))
        try:
            if request.user.is_authenticated() and request.session and request.user:
                if request.user.profile.user_session_key != request.session.session_key and \
                        request.profile.user_session_key != '':
                    django_logout(request)
                    messages.add_message(request, messages.ERROR, u'Другой пользователь вошёл под этим логином.')
        except:
            # print 'no user profile'
            pass