//-- copyright
// OpenProject is a project management system.
// Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2013 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// See doc/COPYRIGHT.rdoc for more details.
//++

import {BehaviorSubject} from 'rxjs';
import {openprojectLegacyModule} from "../../openproject-legacy-app";
import {auditTime} from "rxjs/operators";

// with courtesy of http://stackoverflow.com/a/29722694/3206935

function focusWithinDirective($timeout:ng.ITimeoutService) {
  return {
    restrict: 'A',

    scope: {
      selector: '=focusWithin'
    },

    link: (scope:any, element:ng.IAugmentedJQuery) => {
      let focusedObservable = new BehaviorSubject(false);

      let focusedSubscription = focusedObservable
        .pipe(
          auditTime(50)
        )
        .subscribe(focused => {
           element.toggleClass('-focus', focused);
        });


      let focusListener = function () {
          focusedObservable.next(true);
      };
      element[0].addEventListener('focus', focusListener, true);

      let blurListener = function () {
          focusedObservable.next(false);
      };
      element[0].addEventListener('blur', blurListener, true);

      $timeout(() => {
        element.addClass('focus-within--trigger');
        element.find(scope.selector).addClass('focus-within--depending');
      }, 0);

      scope.$on('$destroy', function() {
        focusedSubscription.unsubscribe();
      });
    }
  };
}

openprojectLegacyModule.directive('focusWithin', focusWithinDirective);