from pyramid.events import subscriber, BeforeRender

from social.apps.pyramid_app.utils import backends

from example.models import DBSession, User


def login_user(strategy, user):
    strategy.request.session['user_id'] = user.id


def login_required(request):
    return getattr(request, 'user', None) is not None


def get_user(request):
    user_id = request.session.get('user_id')
    if user_id:
        user = DBSession.query(User)\
                        .filter(User.id == user_id)\
                        .first()
    else:
        user = None
    return user


@subscriber(BeforeRender)
def add_social(event):
    request = event['request']
    event['social'] = backends(request, request.user)