( function() {
	'use strict';

	if ( 'querySelector' in document && 'addEventListener' in window ) {
		/**
		 * Navigation search.
		 *
		 * @param {Object} e The event.
		 * @param {Object} item The clicked item.
		 */
		var toggleSearch = function( e, item ) {
			e.preventDefault();

			if ( ! item ) {
				item = this;
			}

			var forms = document.querySelectorAll( '.navigation-search' ),
				toggles = document.querySelectorAll( '.search-item' ),
				focusableEls = document.querySelectorAll( 'a[href], area[href], input:not([disabled]):not(.navigation-search), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), [tabindex="0"]' ),
				nav = '';

			if ( item.closest( '.mobile-menu-control-wrapper' ) ) {
				nav = document.getElementById( 'site-navigation' );
			}

			for ( var i = 0; i < forms.length; i++ ) {
				if ( forms[ i ].classList.contains( 'nav-search-active' ) ) {
					if ( forms[ i ].closest( '#sticky-placeholder' ) ) {
						continue;
					}

					forms[ i ].classList.remove( 'nav-search-active' );

					var activeSearch = document.querySelector( '.has-active-search' );

					if ( activeSearch ) {
						activeSearch.classList.remove( 'has-active-search' );
					}

					for ( var t = 0; t < toggles.length; t++ ) {
						toggles[ t ].classList.remove( 'close-search' );
						toggles[ t ].classList.remove( 'active' );
						toggles[ t ].querySelector( 'a' ).setAttribute( 'aria-label', wpkoiNavSearch.open );

						// Allow tabindex on items again.
						for ( var f = 0; f < focusableEls.length; f++ ) {
							if ( ! focusableEls[ f ].closest( '.navigation-search' ) && ! focusableEls[ f ].closest( '.search-item' ) ) {
								focusableEls[ f ].removeAttribute( 'tabindex' );
							}
						}
					}

					document.activeElement.blur();
				} else {
					if ( forms[ i ].closest( '#sticky-placeholder' ) ) {
						continue;
					}

					var openedMobileMenu = forms[ i ].closest( '.toggled' );

					if ( openedMobileMenu ) {
					}

					if ( nav ) {
						nav.classList.add( 'has-active-search' );
					}

					forms[ i ].classList.add( 'nav-search-active' );

					var container = this.closest( 'nav' );

					if ( container ) {
						if ( container.classList.contains( 'mobile-menu-control-wrapper' ) ) {
							container = nav;
						}

						var searchField = container.querySelector( '.search-field' );

						if ( searchField ) {
							searchField.focus();
						}
					}

					for ( t = 0; t < toggles.length; t++ ) {
						toggles[ t ].classList.add( 'active' );
						toggles[ t ].querySelector( 'a' ).setAttribute( 'aria-label', wpkoiNavSearch.close );

						// Trap tabindex within the search element
						for ( f = 0; f < focusableEls.length; f++ ) {
							if ( ! focusableEls[ f ].closest( '.navigation-search' ) && ! focusableEls[ f ].closest( '.search-item' ) ) {
								focusableEls[ f ].setAttribute( 'tabindex', '-1' );
							}
						}

						toggles[ t ].classList.add( 'close-search' );
					}
				}
			}
		};

		if ( document.body.classList.contains( 'nav-search-enabled' ) ) {
			var searchItems = document.querySelectorAll( '.search-item' );

			for ( var i = 0; i < searchItems.length; i++ ) {
				searchItems[ i ].addEventListener( 'click', toggleSearch, false );
			}

			// Close navigation search on escape key
			document.addEventListener( 'keydown', function( e ) {
				if ( document.querySelector( '.navigation-search.nav-search-active' ) ) {
					if ( 'Escape' === e.key ) {
						var activeSearchItems = document.querySelectorAll( '.search-item.active' );

						for ( var activeSearchItem = 0; activeSearchItem < activeSearchItems.length; activeSearchItem++ ) {
							toggleSearch( e, activeSearchItems[ activeSearchItem ] );
							break;
						}
					}
				}
			}, false );
		}
	}
}() );
