( function( $ ) {

	var scroll = true;
	var scroll_offset = 30;
	var scroll_delay = 800;
	var scroll_to_top = false;
	var scroll_element = null;

	var parseTocSlug = function( slug ) {

		// If not have the element then return false!
		if( ! slug ) {
			return slug;
		}

		var parsedSlug = slug.toString().toLowerCase()
			.replace(/\…+/g,'')                             // Remove multiple …
			.replace(/\u2013|\u2014/g, '')				 	// Remove long dash
			.replace(/&(amp;)/g, '')					 	// Remove &
			.replace(/[&]nbsp[;]/gi, '-')                	// Replace inseccable spaces
			.replace(/[^a-z0-9 -_]/gi,'')                	// Keep only alphnumeric, space, -, _
			.replace(/&(mdash;)/g, '')					 	// Remove long dash
			.replace(/\s+/g, '-')                        	// Replace spaces with -
			.replace(/[&\/\\#,^!+()$~%.\[\]'":*?;-_<>{}@‘’”“|]/g, '')  // Remove special chars
			.replace(/\-\-+/g, '-')                      	// Replace multiple - with single -
			.replace(/^-+/, '')                          	// Trim - from start of text
			.replace(/-+$/, '');                         	// Trim - from end of text

		return decodeURI( encodeURIComponent( parsedSlug ) );
	};

	UAGBTableOfContents = {

		init: function() {

			$( document ).on( "click",".uagb-toc__list a", UAGBTableOfContents._scroll );
			$( document ).on( "click",".uagb-toc__scroll-top", UAGBTableOfContents._scrollTop );
			$( document ).on( "click",'.uagb-toc__title-wrap', UAGBTableOfContents._toggleCollapse );
			$( document ).on( "scroll", UAGBTableOfContents._showHideScroll  );

		},

		hyperLinks: function() {
			var hash = window.location.hash.substring(0);
			if ( '' === hash || (/[^a-z0-9_-]$/).test( hash ) ) { 
				return;
			}
			var hashId = encodeURI( hash.substring( 0 ) );
			var selectedAnchor = document.querySelector( hashId );
			if ( null === selectedAnchor ){
				return;
			}
			var node = $( document ).find( '.wp-block-uagb-table-of-contents' );
			scroll_offset = node.data( 'offset' );
			var offset = $( decodeURIComponent( hash ) ).offset();
			scroll_delay = node.data( 'delay' );
			if ( "undefined" != typeof offset ) {
				$( "html, body" ).animate( {
					scrollTop: ( offset.top - scroll_offset )
				}, scroll_delay )
			}
		},

		_toggleCollapse: function( e ) {
			if ( $( this ).find( '.uag-toc__collapsible-wrap' ).length > 0 ) {
				let $root = $( this ).closest( '.wp-block-uagb-table-of-contents' );

				if ( $root.hasClass( 'uagb-toc__collapse' ) ) {
					$root.removeClass( 'uagb-toc__collapse' );
				} else {
					$root.addClass( 'uagb-toc__collapse' );
				}
			}
		},

		_showHideScroll: function( e ) {

			if ( null != scroll_element ) {

				if ( jQuery( window ).scrollTop() > 300 ) {
					if ( scroll_to_top ) {
						scroll_element.addClass( "uagb-toc__show-scroll" );
					} else {
						scroll_element.removeClass( "uagb-toc__show-scroll" );
					}
				} else {
					scroll_element.removeClass( "uagb-toc__show-scroll" );
				}
			}
		},

		/**
		 * Smooth To Top.
		 */
		_scrollTop: function( e ) {

			$( "html, body" ).animate( {
				scrollTop: 0
			}, 800 )

		},

		/**
		 * Smooth Scroll.
		 */
		_scroll: function( e ) {

			if ( this.hash !== "" ) {

				var hash = this.hash;
				var node = $( this ). closest( '.wp-block-uagb-table-of-contents' );

				scroll = node.data( 'scroll' );
				scroll_offset = node.data( 'offset' );
				scroll_delay = node.data( 'delay' );

				if ( scroll ) {

					var offset = $( decodeURIComponent( hash ) ).offset();

					if ( "undefined" != typeof offset ) {

						$( "html, body" ).animate( {
							scrollTop: ( offset.top - scroll_offset )
						}, scroll_delay )
					}
				}

			}
		},

		/**
		 * Alter the_content.
		 */
		_run: function( attr, id ) {

			var $this_scope = $( id );

			if ( $this_scope.find( '.uag-toc__collapsible-wrap' ).length > 0 ) {
				$this_scope.find( '.uagb-toc__title-wrap' ).addClass( 'uagb-toc__is-collapsible' );
			}
			
			var allowed_h_tags = [];
			let headerMappingHeaders = [];
			if ( undefined !== attr.mappingHeaders ) {

				attr.mappingHeaders.forEach(function(h_tag, index) { (h_tag === true ? allowed_h_tags.push('h' + (index+1)) : null);});
				var allowed_h_tags_str = ( null !== allowed_h_tags ) ? allowed_h_tags.join( ',' ) : '';

				headerMappingHeaders = attr.mappingHeaders.filter(header => header).length;
			}

			var all_header = ( undefined !== allowed_h_tags_str && '' !== allowed_h_tags_str ) ? $( 'body' ).find( allowed_h_tags_str ) : $( 'body' ).find('h1, h2, h3, h4, h5, h6' );

			if ( 0 !== all_header.length ) {

				let toc_list_wrap = $('.uagb-toc__list-wrap');

				all_header.each( function (index,value){
					let header = $( this );
					let header_text = parseTocSlug( header.text() );

					if ( header_text.length < 1 ) {
						let list_heading = toc_list_wrap.find('a:contains("' + header.text() +  '")');

						if ( list_heading.length > 0 ) {
							header_text = list_heading.attr('href').replace(/#/g, '');
						}
					}

					header.before('<span id="'+ header_text +'" class="uag-toc__heading-anchor"></span>');
				});				
			}

			scroll_to_top = attr.scrollToTop;

			var scrollToTopSvg = '<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" version=\"1.1\" id=\"Layer_1\" x=\"0px\" y=\"0px\" width=\"26px\" height=\"16.043px\" viewBox=\"57 35.171 26 16.043\" enable-background=\"new 57 35.171 26 16.043\" xml:space=\"preserve\"><path d=\"M57.5,38.193l12.5,12.5l12.5-12.5l-2.5-2.5l-10,10l-10-10L57.5,38.193z\"/></svg>';

			scroll_element = $( ".uagb-toc__scroll-top" );
			if ( 0 == scroll_element.length ) {
				$( "body" ).append( "<div class=\"uagb-toc__scroll-top\"> " + scrollToTopSvg + "</div>" );
				scroll_element = $( ".uagb-toc__scroll-top" );
			}

			if ( scroll_to_top ) {
				scroll_element.addClass( "uagb-toc__show-scroll" );
			} else {
				scroll_element.removeClass( "uagb-toc__show-scroll" );
			}

			UAGBTableOfContents._showHideScroll();
			UAGBTableOfContents.hyperLinks();
		},
	}

	$( document ).ready(function() {
		UAGBTableOfContents.init();
	})

} )( jQuery )