/* global screenReaderText */

/**

 * Theme functions file.

 *

 * Contains handlers for navigation and widget area.

 */

( function( $ ) {

	var body, masthead, menuToggle, siteNavigation, socialNavigation, siteHeaderMenu, resizeTimer;

	function initMainNavigation( container ) {

		// Add dropdown toggle that displays child menu items.

		var dropdownToggle = $( '<button />', {

			'class': 'dropdown-toggle',

			'aria-expanded': false

		} ).append( $( '<span />', {

			'class': 'screen-reader-text',

			text: screenReaderText.expand

		} ) );

		container.find( '.menu-item-has-children > a' ).after( dropdownToggle );

		// Toggle buttons and submenu items with active children menu items.

		container.find( '.current-menu-ancestor > button' ).addClass( 'toggled-on' );

		container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );

		// Add menu items with submenus to aria-haspopup="true".

		container.find( '.menu-item-has-children' ).attr( 'aria-haspopup', 'true' );

		container.find( '.dropdown-toggle' ).click( function( e ) {

			var _this            = $( this ),

				screenReaderSpan = _this.find( '.screen-reader-text' );

			e.preventDefault();

			_this.toggleClass( 'toggled-on' );

			_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );

			// jscs:disable

			_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );

			// jscs:enable

			screenReaderSpan.text( screenReaderSpan.text() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );

		} );

	}

	initMainNavigation( $( '.main-navigation' ) );

	masthead         = $( '#masthead' );

	menuToggle       = masthead.find( '#menu-toggle' );

	siteHeaderMenu   = masthead.find( '#site-header-menu' );

	siteNavigation   = masthead.find( '#site-navigation' );

	socialNavigation = masthead.find( '#social-navigation' );

	// Enable menuToggle.

	( function() {

		// Return early if menuToggle is missing.

		if ( ! menuToggle.length ) {

			return;

		}

		// Add an initial values for the attribute.

		menuToggle.add( siteNavigation ).add( socialNavigation ).attr( 'aria-expanded', 'false' );

		menuToggle.on( 'click.twentysixteen', function() {

			$( this ).add( siteHeaderMenu ).toggleClass( 'toggled-on' );

			// jscs:disable

			$( this ).add( siteNavigation ).add( socialNavigation ).attr( 'aria-expanded', $( this ).add( siteNavigation ).add( socialNavigation ).attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );

			// jscs:enable

		} );

	} )();

	// Fix sub-menus for touch devices and better focus for hidden submenu items for accessibility.

	( function() {

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

			return;

		}

		// Toggle `focus` class to allow submenu access on tablets.

		function toggleFocusClassTouchScreen() {

			if ( window.innerWidth >= 910 ) {

				$( document.body ).on( 'touchstart.twentysixteen', function( e ) {

					if ( ! $( e.target ).closest( '.main-navigation li' ).length ) {

						$( '.main-navigation li' ).removeClass( 'focus' );

					}

				} );

				siteNavigation.find( '.menu-item-has-children > a' ).on( 'touchstart.twentysixteen', function( e ) {

					var el = $( this ).parent( 'li' );

					if ( ! el.hasClass( 'focus' ) ) {

						e.preventDefault();

						el.toggleClass( 'focus' );

						el.siblings( '.focus' ).removeClass( 'focus' );

					}

				} );

			} else {

				siteNavigation.find( '.menu-item-has-children > a' ).unbind( 'touchstart.twentysixteen' );

			}

		}

		if ( 'ontouchstart' in window ) {

			$( window ).on( 'resize.twentysixteen', toggleFocusClassTouchScreen );

			toggleFocusClassTouchScreen();

		}

		siteNavigation.find( 'a' ).on( 'focus.twentysixteen blur.twentysixteen', function() {

			$( this ).parents( '.menu-item' ).toggleClass( 'focus' );

		} );

	} )();

	// Add the default ARIA attributes for the menu toggle and the navigations.

	function onResizeARIA() {

		if ( window.innerWidth < 910 ) {

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

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

			} else {

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

			}

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

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

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

			} else {

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

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

			}

			menuToggle.attr( 'aria-controls', 'site-navigation social-navigation' );

		} else {

			menuToggle.removeAttr( 'aria-expanded' );

			siteNavigation.removeAttr( 'aria-expanded' );

			socialNavigation.removeAttr( 'aria-expanded' );

			menuToggle.removeAttr( 'aria-controls' );

		}

	}

	// Add 'below-entry-meta' class to elements.

	function belowEntryMetaClass( param ) {

		if ( body.hasClass( 'page' ) || body.hasClass( 'search' ) || body.hasClass( 'single-attachment' ) || body.hasClass( 'error404' ) ) {

			return;

		}

		$( '.entry-content' ).find( param ).each( function() {

			var element              = $( this ),

				elementPos           = element.offset(),

				elementPosTop        = elementPos.top,

				entryFooter          = element.closest( 'article' ).find( '.entry-footer' ),

				entryFooterPos       = entryFooter.offset(),

				entryFooterPosBottom = entryFooterPos.top + ( entryFooter.height() + 28 ),

				caption              = element.closest( 'figure' ),

				newImg;

			// Add 'below-entry-meta' to elements below the entry meta.

			if ( elementPosTop > entryFooterPosBottom ) {

				// Check if full-size images and captions are larger than or equal to 840px.

				if ( 'img.size-full' === param ) {

					// Create an image to find native image width of resized images (i.e. max-width: 100%).

					newImg = new Image();

					newImg.src = element.attr( 'src' );

					$( newImg ).on( 'load.twentysixteen', function() {

						if ( newImg.width >= 840  ) {

							element.addClass( 'below-entry-meta' );

							if ( caption.hasClass( 'wp-caption' ) ) {

								caption.addClass( 'below-entry-meta' );

								caption.removeAttr( 'style' );

							}

						}

					} );

				} else {

					element.addClass( 'below-entry-meta' );

				}

			} else {

				element.removeClass( 'below-entry-meta' );

				caption.removeClass( 'below-entry-meta' );

			}

		} );

	}

	$( document ).ready( function() {

		body = $( document.body );

		$( window )

			.on( 'load.twentysixteen', onResizeARIA )

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

				clearTimeout( resizeTimer );

				resizeTimer = setTimeout( function() {

					belowEntryMetaClass( 'img.size-full' );

					belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );

				}, 300 );

				onResizeARIA();

			} );

		belowEntryMetaClass( 'img.size-full' );

		belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );

	} );

} )( jQuery );