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/* global screenReaderText */
/**
 * Theme functions file.
 *
 * Contains handlers for navigation and widget area.
 */

( function( $ ) {
	var $body, $window, $sidebar, adminbarOffset, top = false,
	    bottom = false, windowWidth, windowHeight, lastWindowPos = 0,
	    topOffset = 0, bodyHeight, sidebarHeight, resizeTimer,
	    secondary, button;

	function initMainNavigation( container ) {
		// Add dropdown toggle that display child menu items.
		container.find( '.menu-item-has-children > a' ).after( '<button class="dropdown-toggle" aria-expanded="false">' + screenReaderText.expand + '</button>' );

		// Toggle buttons and submenu items with active children menu items.
		container.find( '.current-menu-ancestor > button' ).addClass( 'toggle-on' );
		container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );

		container.find( '.dropdown-toggle' ).click( function( e ) {
			var _this = $( this );
			e.preventDefault();
			_this.toggleClass( 'toggle-on' );
			_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
			_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
			_this.html( _this.html() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
		} );
	}
	initMainNavigation( $( '.main-navigation' ) );

	// Re-initialize the main navigation when it is updated, persisting any existing submenu expanded states.
	$( document ).on( 'customize-preview-menu-refreshed', function( e, params ) {
		if ( 'primary' === params.wpNavMenuArgs.theme_location ) {
			initMainNavigation( params.newContainer );

			// Re-sync expanded states from oldContainer.
			params.oldContainer.find( '.dropdown-toggle.toggle-on' ).each(function() {
				var containerId = $( this ).parent().prop( 'id' );
				$( params.newContainer ).find( '#' + containerId + ' > .dropdown-toggle' ).triggerHandler( 'click' );
			});
		}
	});

	secondary = $( '#secondary' );
	button = $( '.site-branding' ).find( '.secondary-toggle' );

	// Enable menu toggle for small screens.
	( function() {
		var menu, widgets, social;
		if ( ! secondary.length || ! button.length ) {
			return;
		}

		// Hide button if there are no widgets and the menus are missing or empty.
		menu    = secondary.find( '.nav-menu' );
		widgets = secondary.find( '#widget-area' );
		social  = secondary.find( '#social-navigation' );
		if ( ! widgets.length && ! social.length && ( ! menu.length || ! menu.children().length ) ) {
			button.hide();
			return;
		}

		button.on( 'click.twentyfifteen', function() {
			secondary.toggleClass( 'toggled-on' );
			secondary.trigger( 'resize' );
			$( this ).toggleClass( 'toggled-on' );
			if ( $( this, secondary ).hasClass( 'toggled-on' ) ) {
				$( this ).attr( 'aria-expanded', 'true' );
				secondary.attr( 'aria-expanded', 'true' );
			} else {
				$( this ).attr( 'aria-expanded', 'false' );
				secondary.attr( 'aria-expanded', 'false' );
			}
		} );
	} )();

	/**
	 * @summary Add or remove ARIA attributes.
	 * Uses jQuery's width() function to determine the size of the window and add
	 * the default ARIA attributes for the menu toggle if it's visible.
	 * @since Twenty Fifteen 1.1
	 */
	function onResizeARIA() {
		if ( 955 > $window.width() ) {
			button.attr( 'aria-expanded', 'false' );
			secondary.attr( 'aria-expanded', 'false' );
			button.attr( 'aria-controls', 'secondary' );
		} else {
			button.removeAttr( 'aria-expanded' );
			secondary.removeAttr( 'aria-expanded' );
			button.removeAttr( 'aria-controls' );
		}
	}

	// Sidebar scrolling.
	function resize() {
		windowWidth = $window.width();

		if ( 955 > windowWidth ) {
			top = bottom = false;
			$sidebar.removeAttr( 'style' );
		}
	}

	function scroll() {
		var windowPos = $window.scrollTop();

		if ( 955 > windowWidth ) {
			return;
		}

		sidebarHeight = $sidebar.height();
		windowHeight  = $window.height();
		bodyHeight    = $body.height();

		if ( sidebarHeight + adminbarOffset > windowHeight ) {
			if ( windowPos > lastWindowPos ) {
				if ( top ) {
					top = false;
					topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
					$sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
				} else if ( ! bottom && windowPos + windowHeight > sidebarHeight + $sidebar.offset().top && sidebarHeight + adminbarOffset < bodyHeight ) {
					bottom = true;
					$sidebar.attr( 'style', 'position: fixed; bottom: 0;' );
				}
			} else if ( windowPos < lastWindowPos ) {
				if ( bottom ) {
					bottom = false;
					topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
					$sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
				} else if ( ! top && windowPos + adminbarOffset < $sidebar.offset().top ) {
					top = true;
					$sidebar.attr( 'style', 'position: fixed;' );
				}
			} else {
				top = bottom = false;
				topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
				$sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
			}
		} else if ( ! top ) {
			top = true;
			$sidebar.attr( 'style', 'position: fixed;' );
		}

		lastWindowPos = windowPos;
	}

	function resizeAndScroll() {
		resize();
		scroll();
	}

	$( document ).ready( function() {
		$body          = $( document.body );
		$window        = $( window );
		$sidebar       = $( '#sidebar' ).first();
		adminbarOffset = $body.is( '.admin-bar' ) ? $( '#wpadminbar' ).height() : 0;

		$window
			.on( 'scroll.twentyfifteen', scroll )
			.on( 'load.twentyfifteen', onResizeARIA )
			.on( 'resize.twentyfifteen', function() {
				clearTimeout( resizeTimer );
				resizeTimer = setTimeout( resizeAndScroll, 500 );
				onResizeARIA();
			} );
		$sidebar.on( 'click.twentyfifteen keydown.twentyfifteen', 'button', resizeAndScroll );

		resizeAndScroll();

		for ( var i = 1; i < 6; i++ ) {
			setTimeout( resizeAndScroll, 100 * i );
		}
	} );

} )( jQuery );