import sqlalchemy as sa
from ..models.user import User


class UserService(object):

    @classmethod
    def all(cls, request):
        items = request.dbsession.query(User).order_by(sa.asc(User.name)).all()
        return items

    @classmethod
    def by_name(cls, request, name ):
        item = request.dbsession.query(User).filter(User.name == name).first()
        return item

    @classmethod
    def delete(cls, request, id):
        request.dbsession.query(User).filter(User.id == id).delete(synchronize_session=False)
        return 

def groupfinder(userid, request):

    if userid:
        # user name is 'admin' ?
        if userid == 'admin':
            return ['group:administrators']
        else:
            return []  # it means that userid is logged in 
    else:
        # it returns None if userid isn't logged in
        return None