discourse-custom-wizard/assets/javascripts/wizard/controllers/wizard-index.js.es6

import Controller from "@ember/controller";
import { or } from "@ember/object/computed";
import discourseComputed from "discourse-common/utils/decorators";

const reasons = {
  noWizard: "none",
  requiresLogin: "requires_login",
  notPermitted: "not_permitted",
  completed: "completed"
}

export default Controller.extend({
  noAccess: or('noWizard', 'requiresLogin', 'notPermitted', 'completed'),

  @discourseComputed('noAccessReason')
  noAccessI18nKey(reason) {
    return reason ? `wizard.${reasons[reason]}` : 'wizard.none';
  },

  @discourseComputed
  noAccessReason() {
    return Object.keys(reasons).find(reason => this.get(reason));
  }
});