/**

 * Accordion-folding functionality.

 *

 * Markup with the appropriate classes will be automatically hidden,

 * with one section opening at a time when its title is clicked.

 * Use the following markup structure for accordion behavior:

 *

 * <div class="accordion-container">

 *	<div class="accordion-section open">

 *		<h3 class="accordion-section-title"><button type="button" aria-expanded="true" aria-controls="target-1"></button></h3>

 *		<div class="accordion-section-content" id="target">

 *		</div>

 *	</div>

 *	<div class="accordion-section">

 *		<h3 class="accordion-section-title"><button type="button" aria-expanded="false" aria-controls="target-2"></button></h3>

 *		<div class="accordion-section-content" id="target-2">

 *		</div>

 *	</div>

 *	<div class="accordion-section">

 *		<h3 class="accordion-section-title"><button type="button" aria-expanded="false" aria-controls="target-3"></button></h3>

 *		<div class="accordion-section-content" id="target-3">

 *		</div>

 *	</div>

 * </div>

 *

 * Note that any appropriate tags may be used, as long as the above classes are present.

 *

 * @since 3.6.0

 * @output wp-admin/js/accordion.js

 */

( function( $ ){

	$( function () {

		// Expand/Collapse accordion sections on click.

		$( '.accordion-container' ).on( 'click', '.accordion-section-title button', function() {

			accordionSwitch( $( this ) );

		});

	});

	/**

	 * Close the current accordion section and open a new one.

	 *

	 * @param {Object} el Title element of the accordion section to toggle.

	 * @since 3.6.0

	 */

	function accordionSwitch ( el ) {

		var section = el.closest( '.accordion-section' ),

			container = section.closest( '.accordion-container' ),

			siblings = container.find( '.open' ),

			siblingsToggleControl = siblings.find( '[aria-expanded]' ).first(),

			content = section.find( '.accordion-section-content' );

		// This section has no content and cannot be expanded.

		if ( section.hasClass( 'cannot-expand' ) ) {

			return;

		}

		// Add a class to the container to let us know something is happening inside.

		// This helps in cases such as hiding a scrollbar while animations are executing.

		container.addClass( 'opening' );

		if ( section.hasClass( 'open' ) ) {

			section.toggleClass( 'open' );

			content.toggle( true ).slideToggle( 150 );

		} else {

			siblingsToggleControl.attr( 'aria-expanded', 'false' );

			siblings.removeClass( 'open' );

			siblings.find( '.accordion-section-content' ).show().slideUp( 150 );

			content.toggle( false ).slideToggle( 150 );

			section.toggleClass( 'open' );

		}

		// We have to wait for the animations to finish.

		setTimeout(function(){

		    container.removeClass( 'opening' );

		}, 150);

		// If there's an element with an aria-expanded attribute, assume it's a toggle control and toggle the aria-expanded value.

		if ( el ) {

			el.attr( 'aria-expanded', String( el.attr( 'aria-expanded' ) === 'false' ) );

		}

	}

})(jQuery);