<script>
jQuery(function($){

	var buttonSelector = '#open-close-button';
	var accordionSelector = '#open-close-accordion';
	
	class Button {
		constructor(selector, openAllText='Open All', closeAllText='Close All') {
			this.elem = $(selector);
			this.openAll = openAllText;
			this.closeAll = closeAllText;
		}
		setTextToOpenAll() { 
			this.elem.text(this.openAll); 
		}
		setTextToCloseAll() { 
			this.elem.text(this.closeAll); 
		}
		isCloseAll() { 
			return (this.elem.text() == this.closeAll); 
		}
		addClickHandler(accordion, callback) { 
			this.elem.click(
				{button: this, accordion: accordion}, 
				function(e) { 
					e.preventDefault(); 
					callback(e.data.button, e.data.accordion); 
				}
			); 
		}
	}

	class Toggle {
		constructor(elem) {
			this.elem = elem;
		}
		isOpen() { 
			return this.elem.hasClass('et_pb_toggle_open');
		}
		click() {
			this.title().click();
		}
		addClickHandler(button, accordion, callback) {
			this.title().click(
				{button: button, accordion: accordion}, 
				function(e) { 
					callback(
						e.data.button, 
						e.data.accordion, 
						new Toggle($(this).closest('.et_pb_accordion_item'))
					); 
				}
			);
		}
		title() {
			return this.elem.find('.et_pb_toggle_title');
		}
		opened() {
			return new Toggle(this.elem.filter('.et_pb_toggle_open'));
		}
		closed() {
			return new Toggle(this.elem.filter('.et_pb_toggle_close'));
		}
		count() {
			return this.elem.length;
		}
	}

	class Accordion {
		constructor(selector) {
			this.selector = selector;
		}
		elem() { 
			return $(this.selector); 
		}
		isToggling() { 
			return this.elem().hasClass('.et_pb_accordion_toggling'); 
		}
		clickOpenedToggles() {
			this.toggles().opened().click();
		}
		clickClosedToggles() {
			this.toggles().closed().click();
		}
		addToggleClickHandler(button, callback) {
			this.toggles().addClickHandler(button, this, callback);
		}
		hasOneToggleOpen() { 
			return (this.toggles().opened().count() == 1);
		}
		toggles() {
			return new Toggle(this.elem().find('.et_pb_accordion_item'));
		}
	}

	var $button = new Button(buttonSelector);
	var $accordion = new Accordion(accordionSelector);

	$button.setTextToOpenAll();

	$button.addClickHandler(
		$accordion, 
		function(button, accordion) {
			if (accordion.isToggling()) return;
			if (button.isCloseAll()) {
				accordion.clickOpenedToggles();
				button.setTextToOpenAll();
			} else {
				accordion.clickClosedToggles();
				button.setTextToCloseAll();
			}
		}
	);

	$accordion.addToggleClickHandler(
		$button, 
		function(button, accordion, toggle){
			var lastToggleBeingClosed = (toggle.isOpen() && accordion.hasOneToggleOpen());
			if (lastToggleBeingClosed) {
				button.setTextToOpenAll();
			} else {
				button.setTextToCloseAll();
			}
		}
	);
});
</script>