/**

 * Theme functions file

 *

 * Contains handlers for navigation, accessibility, header sizing

 * footer widgets and Featured Content slider

 *

 */

( function( $ ) {

	var body    = $( 'body' ),

		_window = $( window ),

		nav, button, menu;

	nav = $( '#primary-navigation' );

	button = nav.find( '.menu-toggle' );

	menu = nav.find( '.nav-menu' );

	// Enable menu toggle for small screens.

	( function() {

		if ( ! nav || ! button ) {

			return;

		}

		// Hide button if menu is missing or empty.

		if ( ! menu || ! menu.children().length ) {

			button.hide();

			return;

		}

		button.on( 'click.twentyfourteen', function() {

			nav.toggleClass( 'toggled-on' );

			if ( nav.hasClass( 'toggled-on' ) ) {

				$( this ).attr( 'aria-expanded', 'true' );

				menu.attr( 'aria-expanded', 'true' );

			} else {

				$( this ).attr( 'aria-expanded', 'false' );

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

			}

		} );

	} )();

	/*

	 * Makes "skip to content" link work correctly in IE9 and Chrome for better

	 * accessibility.

	 *

	 * @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/

	 */

	_window.on( 'hashchange.twentyfourteen', function() {

		var hash = location.hash.substring( 1 ), element;

		if ( ! hash ) {

			return;

		}

		element = document.getElementById( hash );

		if ( element ) {

			if ( ! /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) {

				element.tabIndex = -1;

			}

			element.focus();

			// Repositions the window on jump-to-anchor to account for header height.

			window.scrollBy( 0, -80 );

		}

	} );

	$( function() {

		// Search toggle.

		$( '.search-toggle' ).on( 'click.twentyfourteen', function( event ) {

			var that    = $( this ),

				wrapper = $( '#search-container' ),

				container = that.find( 'a' );

			that.toggleClass( 'active' );

			wrapper.toggleClass( 'hide' );

			if ( that.hasClass( 'active' ) ) {

				container.attr( 'aria-expanded', 'true' );

			} else {

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

			}

			if ( that.is( '.active' ) || $( '.search-toggle .screen-reader-text' )[0] === event.target ) {

				wrapper.find( '.search-field' ).focus();

			}

		} );

		/*

		 * Fixed header for large screen.

		 * If the header becomes more than 48px tall, unfix the header.

		 *

		 * The callback on the scroll event is only added if there is a header

		 * image and we are not on mobile.

		 */

		if ( _window.width() > 781 ) {

			var mastheadHeight = $( '#masthead' ).height(),

				toolbarOffset, mastheadOffset;

			if ( mastheadHeight > 48 ) {

				body.removeClass( 'masthead-fixed' );

			}

			if ( body.is( '.header-image' ) ) {

				toolbarOffset  = body.is( '.admin-bar' ) ? $( '#wpadminbar' ).height() : 0;

				mastheadOffset = $( '#masthead' ).offset().top - toolbarOffset;

				_window.on( 'scroll.twentyfourteen', function() {

					if ( _window.scrollTop() > mastheadOffset && mastheadHeight < 49 ) {

						body.addClass( 'masthead-fixed' );

					} else {

						body.removeClass( 'masthead-fixed' );

					}

				} );

			}

		}

		// Focus styles for menus.

		$( '.primary-navigation, .secondary-navigation' ).find( 'a' ).on( 'focus.twentyfourteen blur.twentyfourteen', function() {

			$( this ).parents().toggleClass( 'focus' );

		} );

	} );

	/**

	 * @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 Fourteen 1.4

	 */

	function onResizeARIA() {

		if ( 781 > _window.width() ) {

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

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

			button.attr( 'aria-controls', 'primary-menu' );

		} else {

			button.removeAttr( 'aria-expanded' );

			menu.removeAttr( 'aria-expanded' );

			button.removeAttr( 'aria-controls' );

		}

	}

	_window

		.on( 'load.twentyfourteen', onResizeARIA )

		.on( 'resize.twentyfourteen', function() {

			onResizeARIA();

	} );

	_window.load( function() {

		// Arrange footer widgets vertically.

		if ( $.isFunction( $.fn.masonry ) ) {

			$( '#footer-sidebar' ).masonry( {

				itemSelector: '.widget',

				columnWidth: function( containerWidth ) {

					return containerWidth / 4;

				},

				gutterWidth: 0,

				isResizable: true,

				isRTL: $( 'body' ).is( '.rtl' )

			} );

		}

		// Initialize Featured Content slider.

		if ( body.is( '.slider' ) ) {

			$( '.featured-content' ).featuredslider( {

				selector: '.featured-content-inner > article',

				controlsContainer: '.featured-content'

			} );

		}

	} );

} )( jQuery );