from dal import autocomplete

from .models import Tag


class AuthenticatedUserCreateMixin():
    ''' By default, autocomplete-light only allows creation of
    choices if the user has add permission on the model. However,
    we need to allow any authenticated user to create tags
    '''
    def has_add_permission(self, request):
        print("i am called", request.user)
        return request.user.is_authenticated


class TagAutocomplete(
        AuthenticatedUserCreateMixin, autocomplete.Select2QuerySetView):
    def get_queryset(self):
        if not self.request.user.is_authenticated:
            return Tag.objects.none()

        qs = Tag.objects.all()

        if self.q:
            qs = qs.filter(name__icontains=self.q)

        return qs