from django import forms
from django.utils.translation import ugettext_lazy as _

from misago.acl import algebra
from misago.acl.models import Role
from misago.core.forms import YesNoSwitch


class PermissionsForm(forms.Form):
    legend = _("Search")

    can_search = YesNoSwitch(label=_("Can search site"), initial=1)


def change_permissions_form(role):
    if isinstance(role, Role):
        return PermissionsForm
    else:
        return None


def build_acl(acl, roles, key_name):
    new_acl = {'can_search': 0}
    new_acl.update(acl)

    return algebra.sum_acls(new_acl, roles=roles, key=key_name, can_search=algebra.greater)