var KTCalendarBasic = function() {

                    return {
                        //main function to initiate the module
                        init: function() {
                            var calendarEl = document.getElementById('kt_calendar');
                            var calendar = new FullCalendar.Calendar(calendarEl, {
                                plugins: [ 'interaction', 'dayGrid', 'timeGrid', 'list', 'googleCalendar' ],

                                isRTL: KTUtil.isRTL(),
                                header: {
                                    left: 'prev,next today',
                                    center: 'title',
                                    right: 'dayGridMonth,timeGridWeek,timeGridDay'
                                },

                                displayEventTime: false, // don't show the time column in list view

                                height: 800,
                                contentHeight: 780,
                                aspectRatio: 3,  // see: https://fullcalendar.io/docs/aspectRatio

                                views: {
                                    dayGridMonth: { buttonText: 'month' },
                                    timeGridWeek: { buttonText: 'week' },
                                    timeGridDay: { buttonText: 'day' }
                                },

                                defaultView: 'dayGridMonth',

                                editable: true,
                                eventLimit: true, // allow "more" link when too many events
                                navLinks: true,

                                // THIS KEY WON'T WORK IN PRODUCTION!!!
                                // To make your own Google API key, follow the directions here:
                                // http://fullcalendar.io/docs/google_calendar/
                                googleCalendarApiKey: 'AIzaSyDcnW6WejpTOCffshGDDb4neIrXVUA1EAE',

                                // US Holidays
                                events: 'en.usa#holiday@group.v.calendar.google.com',

                                eventClick: function(event) {
                                    // opens events in a popup window
                                    window.open(event.url, 'gcalevent', 'width=700,height=600');
                                    return false;
                                },

                                loading: function(bool) {
                                    return;

                                    /*
                                    KTApp.block(portlet.getSelf(), {
                                        type: 'loader',
                                        state: 'success',
                                        message: 'Please wait...'
                                    });
                                    */
                                },

                                eventRender: function(info) {
                                    var element = $(info.el);

                                    if (info.event.extendedProps && info.event.extendedProps.description) {
                                        if (element.hasClass('fc-day-grid-event')) {
                                            element.data('content', info.event.extendedProps.description);
                                            element.data('placement', 'top');
                                            KTApp.initPopover(element);
                                        } else if (element.hasClass('fc-time-grid-event')) {
                                            element.find('.fc-title').append('<div class="fc-description">' + info.event.extendedProps.description + '</div>');
                                        } else if (element.find('.fc-list-item-title').lenght !== 0) {
                                            element.find('.fc-list-item-title').append('<div class="fc-description">' + info.event.extendedProps.description + '</div>');
                                        }
                                    }
                                }
                            });

                            calendar.render();
                        }
                    };
                }();

                jQuery(document).ready(function() {
                    KTCalendarBasic.init();
                });