/**
 * Toolbar module for wikiEditor
 */
( function () {

	var toolbarModule = {

		/**
		 * API accessible functions
		 */
		api: {
			addToToolbar: function ( context, data ) {

				for ( var type in data ) {
					var i;
					switch ( type ) {
						case 'sections':
							var $sections = context.modules.toolbar.$toolbar.find( 'div.sections' );
							var $tabs = context.modules.toolbar.$toolbar.find( 'div.tabs' );
							for ( var section in data[ type ] ) {
								if ( section === 'main' ) {
									// Section
									context.modules.toolbar.$toolbar.prepend(
										toolbarModule.fn.buildSection(
											context, section, data[ type ][ section ]
										)
									);
									continue;
								}
								// Section
								$sections.append(
									toolbarModule.fn.buildSection( context, section, data[ type ][ section ] )
								);
								// Tab
								$tabs.append(
									toolbarModule.fn.buildTab( context, section, data[ type ][ section ] )
								);
							}
							break;
						case 'groups':
							if ( !( 'section' in data ) ) {
								continue;
							}
							var $section = context.modules.toolbar.$toolbar.find( 'div[rel="' + data.section + '"].section' );
							for ( var group in data[ type ] ) {
								// Group
								$section.append(
									toolbarModule.fn.buildGroup( context, group, data[ type ][ group ] )
								);
							}
							break;
						case 'tools':
							if ( !( 'section' in data && 'group' in data ) ) {
								continue;
							}
							var $group = context.modules.toolbar.$toolbar.find(
								'div[rel="' + data.section + '"].section ' +
								'div[rel="' + data.group + '"].group'
							);
							for ( var tool in data[ type ] ) {
								// Tool
								$group.append( toolbarModule.fn.buildTool( context, tool, data[ type ][ tool ] ) );
							}
							if ( $group.children().length ) {
								$group.removeClass( 'empty' );
							}
							break;
						case 'pages':
							if ( !( 'section' in data ) ) {
								continue;
							}
							var $pages = context.modules.toolbar.$toolbar.find(
								'div[rel="' + data.section + '"].section .pages'
							);
							var $index = context.modules.toolbar.$toolbar.find(
								'div[rel="' + data.section + '"].section .index'
							);
							for ( var page in data[ type ] ) {
								// Page
								$pages.append( toolbarModule.fn.buildPage( context, page, data[ type ][ page ] ) );
								// Index
								$index.append(
									toolbarModule.fn.buildBookmark( context, page, data[ type ][ page ] )
								);
							}
							toolbarModule.fn.updateBookletSelection( context, data.section, $pages, $index );
							break;
						case 'rows':
							if ( !( 'section' in data && 'page' in data ) ) {
								continue;
							}
							var $table = context.modules.toolbar.$toolbar.find(
								'div[rel="' + data.section + '"].section ' +
								'div[rel="' + data.page + '"].page table'
							);
							for ( i = 0; i < data.rows.length; i++ ) {
								// Row
								$table.append( toolbarModule.fn.buildRow( context, data.rows[ i ] ) );
							}
							break;
						case 'characters':
							if ( !( 'section' in data && 'page' in data ) ) {
								continue;
							}
							var $characters = context.modules.toolbar.$toolbar.find(
								'div[rel="' + data.section + '"].section ' +
								'div[rel="' + data.page + '"].page div'
							);
							var actions = $characters.data( 'actions' );
							for ( i = 0; i < data.characters.length; i++ ) {
								// Character
								$characters.append(
									$( toolbarModule.fn.buildCharacter( data.characters[ i ], actions ) )
										.on( 'mousedown', function ( e ) {
											// No dragging!
											e.preventDefault();
											return false;
										} )
										.on( 'click', function ( e ) {
											toolbarModule.fn.doAction( $( this ).parent().data( 'context' ),
												$( this ).parent().data( 'actions' )[ $( this ).attr( 'rel' ) ] );
											e.preventDefault();
											return false;
										} )
								);
							}
							break;
						default: break;
					}
				}
			},
			removeFromToolbar: function ( context, data ) {
				if ( typeof data.section === 'string' ) {
					// Section
					var tab = 'div.tabs span[rel="' + data.section + '"].tab';
					var target = 'div[rel="' + data.section + '"].section';
					var group = null;
					if ( typeof data.group === 'string' ) {
						// Toolbar group
						target += ' div[rel="' + data.group + '"].group';
						if ( typeof data.tool === 'string' ) {
							// Save for later checking if empty
							group = target;
							// Tool
							target = target + ' [rel="' + data.tool + '"].tool';
						}
					} else if ( typeof data.page === 'string' ) {
						// Booklet page
						var index = target + ' div.index div[rel="' + data.page + '"]';
						target += ' div.pages div[rel="' + data.page + '"].page';
						if ( typeof data.character === 'string' ) {
							// Character
							target += ' span[rel="' + data.character + '"]';
						} else if ( typeof data.row === 'number' ) {
							// Table row
							target += ' table tr:not(:has(th)):eq(' + data.row + ')';
						} else {
							// Just a page, remove the index too!
							context.modules.toolbar.$toolbar.find( index ).remove();
							toolbarModule.fn.updateBookletSelection(
								context,
								data.section,
								context.modules.toolbar.$toolbar.find( target ),
								context.modules.toolbar.$toolbar.find( index )
							);
						}
					} else {
						// Just a section, remove the tab too!
						context.modules.toolbar.$toolbar.find( tab ).remove();
					}
					context.modules.toolbar.$toolbar.find( target ).remove();
					// Hide empty groups
					if ( group ) {
						var $group = context.modules.toolbar.$toolbar.find( group );
						if ( $group.children().length === 0 ) {
							$group.addClass( 'empty' );
						}
					}
				}
			}
		},

		/**
		 * Internally used functions
		 */
		fn: {
			/**
			 * Creates a toolbar module within a wikiEditor
			 *
			 * @param {Object} context Context object of editor to create module in
			 * @param {Object} config Configuration object to create module from
			 */
			create: function ( context, config ) {
				if ( '$toolbar' in context.modules.toolbar ) {
					return;
				}
				context.modules.toolbar.$toolbar = $( '<div>' )
					.addClass( 'wikiEditor-ui-toolbar' )
					.attr( 'id', 'wikiEditor-ui-toolbar' );
				toolbarModule.fn.build( context, config );
				context.$ui.find( '.wikiEditor-ui-top' ).append( context.modules.toolbar.$toolbar );
			},
			/**
			 * Performs an operation based on parameters
			 *
			 * @param {Object} context
			 * @param {Object} action
			 */
			doAction: function ( context, action ) {
				switch ( action.type ) {
					case 'replace':
					case 'encapsulate':
						if ( context.$textarea.prop( 'readonly' ) ) {
							break;
						}
						var parts = {
							pre: $.wikiEditor.autoMsg( action.options, 'pre' ),
							peri: $.wikiEditor.autoMsg( action.options, 'peri' ),
							post: $.wikiEditor.autoMsg( action.options, 'post' )
						};
						var replace = action.type === 'replace';
						if ( 'regex' in action.options && 'regexReplace' in action.options ) {
							var selection = context.$textarea.textSelection( 'getSelection' );
							if ( selection !== '' && selection.match( action.options.regex ) ) {
								parts.peri = selection.replace( action.options.regex,
									action.options.regexReplace );
								parts.pre = parts.post = '';
								replace = true;
							}
						}
						context.$textarea.textSelection(
							'encapsulateSelection',
							$.extend( {}, action.options, parts, { replace: replace } )
						);
						break;
					case 'callback':
						if ( typeof action.execute === 'function' ) {
							action.execute( context );
						}
						break;
					case 'dialog':
						context.fn.saveSelection();
						context.$textarea.wikiEditor( 'openDialog', action.module );
						break;
					default: break;
				}
			},
			buildGroup: function ( context, id, group ) {
				var $group = $( '<div>' ).attr( { class: 'group group-' + id, rel: id } ),
					label = $.wikiEditor.autoMsg( group, 'label' );
				if ( label ) {
					var $label = $( '<span>' )
						.addClass( 'label' )
						.text( label );
					$group.append( $label );
				}
				var empty = true;
				if ( 'tools' in group ) {
					for ( var tool in group.tools ) {
						var $tool = toolbarModule.fn.buildTool( context, tool, group.tools[ tool ] );
						if ( $tool ) {
							// Consider a group with only hidden tools empty as well
							// .is( ':visible' ) always returns false because tool is not attached to the DOM yet
							empty = empty && $tool.css( 'display' ) === 'none';
							$group.append( $tool );
						}
					}
				}
				if ( empty ) {
					$group.addClass( 'empty' );
				}
				return $group;
			},
			buildTool: function ( context, id, tool ) {
				if ( 'filters' in tool ) {
					for ( var i = 0; i < tool.filters.length; i++ ) {
						if ( $( tool.filters[ i ] ).length === 0 ) {
							return null;
						}
					}
				}
				var label = $.wikiEditor.autoMsg( tool, 'label' );
				switch ( tool.type ) {
					case 'button':
					case 'toggle':
						var $button;
						if ( tool.oouiIcon ) {
							var config = {
								framed: false,
								classes: [ 'tool' ],
								icon: tool.oouiIcon,
								title: label
							};
							var oouiButton;
							if ( tool.type === 'button' ) {
								oouiButton = new OO.ui.ButtonWidget( config );
							} else if ( tool.type === 'toggle' ) {
								oouiButton = new OO.ui.ToggleButtonWidget( config );
							}
							$button = oouiButton.$element;
							$button.attr( 'rel', id );
							$button.data( 'ooui', oouiButton );
						} else {
							$button = $( '<a>' )
								.attr( {
									tabindex: 0,
									title: label,
									rel: id,
									role: 'button',
									class: 'tool tool-button'
								} )
								.text( label );
							if ( tool.icon ) {
								var icon = $.wikiEditor.autoIcon(
									tool.icon,
									$.wikiEditor.imgPath + 'toolbar/'
								);
								$button.css( 'background-image', 'url(' + icon + ')' );
							}
						}
						$button.data( 'setActive', function ( active ) {
							$button.toggleClass( 'tool-active', active );

							// OOUI button
							if ( $button.data( 'ooui' ) && tool.type === 'toggle' ) {
								$button.data( 'ooui' ).setValue( active );
								// Use progressive icon in WMUI theme
								if ( OO.ui.WikimediaUITheme && OO.ui.theme instanceof OO.ui.WikimediaUITheme ) {
									// Wait for updateElementClasses to run
									setTimeout( function () {
										$button.data( 'ooui' ).$icon.toggleClass( 'oo-ui-image-progressive', active );
									} );
								}
							}
						} );
						if ( 'action' in tool ) {
							$button
								.data( 'action', tool.action )
								.data( 'context', context )
								.on( 'mousedown', function ( e ) {
									// No dragging!
									e.preventDefault();
									return false;
								} );
							if ( $button.data( 'ooui' ) ) {
								$button.data( 'ooui' ).on( 'click', function () {
									toolbarModule.fn.doAction(
										context, tool.action
									);
								} );
							} else {
								$button.on( 'click keydown', function ( e ) {
									if (
										e.type === 'click' ||
										e.type === 'keydown' && e.key === 'Enter'
									) {
										toolbarModule.fn.doAction(
											context, tool.action
										);
										e.preventDefault();
										return false;
									}
								} );
							}
						}
						return $button;
					case 'select':
						var menuId = 'menu-' + ( new Date() ).getTime();
						var $select = $( '<div>' )
							.attr( { rel: id, class: 'tool tool-select' } );
						var $options = $( '<div>' ).addClass( 'options' );
						if ( 'list' in tool ) {
							for ( var option in tool.list ) {
								var optionLabel = $.wikiEditor.autoMsg( tool.list[ option ], 'label' );
								$options.append(
									$( '<a>' )
										.data( 'action', tool.list[ option ].action )
										.data( 'context', context )
										.on( 'mousedown', function ( e ) {
											// No dragging!
											e.preventDefault();
											return false;
										} )
										.on( 'click keydown', function ( e ) {
											if (
												e.type === 'click' ||
												e.type === 'keydown' && e.key === 'Enter'
											) {
												toolbarModule.fn.doAction(
													$( this ).data( 'context' ), $( this ).data( 'action' ), $( this )
												);
												// Hide the dropdown
												$( this ).closest( '.tool-select' ).removeClass( 'options-shown' );
												e.preventDefault();
												return false;
											}
										} )
										.text( optionLabel )
										.addClass( 'option' )
										.attr( { rel: option, tabindex: 0, role: 'menuitem' } )
								);
							}
						}
						$select.append( $( '<a>' )
							.addClass( 'label' )
							.text( label )
							.data( 'options', $options )
							.attr( { role: 'button', tabindex: 0, 'aria-expanded': false, 'aria-controls': menuId, 'aria-haspopup': 'menu' } )
							.on( 'mousedown', function ( e ) {
								// No dragging!
								e.preventDefault();
								return false;
							} )
							.on( 'click keydown', function ( e ) {
								if (
									e.type === 'click' ||
									e.type === 'keydown' && e.key === 'Enter'
								) {
									var $opts = $( this ).data( 'options' );
									// eslint-disable-next-line no-jquery/no-class-state
									var canShowOptions = !$opts.closest( '.tool-select' ).hasClass( 'options-shown' );
									$opts.closest( '.tool-select' ).toggleClass( 'options-shown', canShowOptions );
									$( this ).attr( 'aria-expanded', canShowOptions.toString() );
									e.preventDefault();
									return false;
								}
							} )
						);
						$select.append( $( '<div>' ).addClass( 'menu' ).append( $options ) );
						return $select;
					default:
						return null;
				}
			},
			buildBookmark: function ( context, id, page ) {
				var label = $.wikiEditor.autoMsg( page, 'label' );
				return $( '<div>' )
					.text( label )
					.attr( {
						rel: id,
						role: 'option'
					} )
					.data( 'context', context )
					.on( 'mousedown', function ( e ) {
						// No dragging!
						e.preventDefault();
						return false;
					} )
					.on( 'click', function ( event ) {
						$( this ).parent().parent().find( '.page' ).hide();
						$( this ).parent().parent().find( '.page-' + $( this ).attr( 'rel' ) ).show().trigger( 'loadPage' );
						$( this ).siblings().removeClass( 'current' );
						$( this ).addClass( 'current' );
						var section = $( this ).parent().parent().attr( 'rel' );
						$.cookie(
							'wikiEditor-' + $( this ).data( 'context' ).instance + '-booklet-' + section + '-page',
							$( this ).attr( 'rel' ),
							{ expires: 30, path: '/' }
						);
						// No dragging!
						event.preventDefault();
						return false;
					} );
			},
			buildPage: function ( context, id, page, deferLoad ) {
				var $page = $( '<div>' ).attr( {
					class: 'page page-' + id,
					rel: id
				} );
				if ( deferLoad ) {
					$page.one( 'loadPage', function () {
						toolbarModule.fn.reallyBuildPage( context, id, page, $page );
					} );
				} else {
					toolbarModule.fn.reallyBuildPage( context, id, page, $page );
				}
				return $page;
			},
			reallyBuildPage: function ( context, id, page, $page ) {
				var i;
				switch ( page.layout ) {
					case 'table':
						$page.addClass( 'page-table' );
						var html =
							'<table class="table-' + id + '">';
						if ( 'headings' in page ) {
							html += toolbarModule.fn.buildHeading( context, page.headings );
						}
						if ( 'rows' in page ) {
							for ( i = 0; i < page.rows.length; i++ ) {
								html += toolbarModule.fn.buildRow( context, page.rows[ i ] );
							}
						}
						$page.html( html + '</table>' );
						break;
					case 'characters':
						$page.addClass( 'page-characters' );
						var $characters = $( '<div>' ).data( 'context', context ).data( 'actions', {} );
						var actions = $characters.data( 'actions' );
						if ( 'language' in page ) {
							$characters.attr( 'lang', page.language );
						}
						if ( 'direction' in page ) {
							$characters.attr( 'dir', page.direction );
						} else {
							// By default it should be explicit ltr for all scripts.
							// Without this some conjoined ltr characters look
							// weird in rtl wikis.
							$characters.attr( 'dir', 'ltr' );
						}
						if ( 'characters' in page ) {
							html = '';
							for ( i = 0; i < page.characters.length; i++ ) {
								html += toolbarModule.fn.buildCharacter( page.characters[ i ], actions );
							}
							$characters
								.html( html )
								.children()
								.attr( 'role', 'option' )
								.on( 'mousedown', function ( e ) {
									// No dragging!
									e.preventDefault();
									return false;
								} )
								.on( 'click', function ( e ) {
									toolbarModule.fn.doAction(
										$( this ).parent().data( 'context' ),
										$( this ).parent().data( 'actions' )[ $( this ).attr( 'rel' ) ],
										$( this )
									);
									e.preventDefault();
									return false;
								} );
						}
						$page.append( $characters );
						break;
				}
			},
			buildHeading: function ( context, headings ) {
				var html = '<tr>';
				for ( var i = 0; i < headings.length; i++ ) {
					html += '<th>' + $.wikiEditor.autoSafeMsg( headings[ i ], [ 'html', 'text' ] ) + '</th>';
				}
				return html + '</tr>';
			},
			buildRow: function ( context, row ) {
				var html = '<tr>';
				for ( var cell in row ) {
					// FIXME: This currently needs to use the "unsafe" .text() message because it embeds raw HTML
					// in the messages (as used exclusively by the 'help' toolbar panel).
					html += '<td class="cell cell-' + cell + '"><span>' +
						$.wikiEditor.autoMsg( row[ cell ], [ 'html', 'text' ] ) + '</span></td>';
				}
				return html + '</tr>';
			},
			buildCharacter: function ( character, actions ) {
				if ( typeof character === 'string' ) {
					character = {
						label: character,
						action: {
							type: 'replace',
							options: {
								peri: character,
								selectPeri: false
							}
						}
					};
				// In some cases the label for the character isn't the same as the
				// character that gets inserted (e.g. Hebrew vowels)
				} else if ( character && 0 in character && 1 in character ) {
					character = {
						label: character[ 0 ],
						action: {
							type: 'replace',
							options: {
								peri: character[ 1 ],
								selectPeri: false
							}
						}
					};
				}
				if ( character && 'action' in character && 'label' in character ) {
					actions[ character.label ] = character.action;
					if ( character.titleMsg !== undefined ) {
						return mw.html.element(
							'span',
							// eslint-disable-next-line mediawiki/msg-doc
							{ rel: character.label, title: mw.msg( character.titleMsg ) },
							character.label
						);
					} else {
						return mw.html.element( 'span', { rel: character.label }, character.label );
					}
				}
				mw.log( 'A character for the toolbar was undefined. This is not supposed to happen. Double check the config.' );
				// bug 31673; also an additional fix for bug 24208...
				return '';
			},
			buildTab: function ( context, id, section ) {
				var selected = $.cookie( 'wikiEditor-' + context.instance + '-toolbar-section' );
				// Re-save cookie
				if ( selected !== null ) {
					$.cookie( 'wikiEditor-' + context.instance + '-toolbar-section', selected, { expires: 30, path: '/' } );
				}
				var $link =
					$( '<a>' )
						.addClass( selected === id ? 'current' : null )
						.attr( {
							tabindex: 0,
							role: 'button',
							'aria-expanded': ( selected === id ).toString(),
							'aria-controls': 'wikiEditor-section-' + id
						} )
						.text( $.wikiEditor.autoMsg( section, 'label' ) )
						.data( 'context', context )
						.on( 'mouseup', function () {
							$( this ).trigger( 'blur' );
						} )
						.on( 'mousedown', function ( e ) {
							// No dragging!
							e.preventDefault();
							return false;
						} )
						.on( 'click keydown', function ( e ) {
							if (
								e.type !== 'click' &&
								( e.type !== 'keydown' || e.key !== 'Enter' )
							) {
								return;
							}
							// We have to set aria-pressed over here, as NVDA wont recognize it
							// if we do it in the below .each as it seems
							$( this ).attr( 'aria-pressed', 'true' );
							$( '.tab > a' ).each( function ( i, elem ) {
								if ( elem !== e.target ) {
									$( elem ).attr( 'aria-pressed', 'false' );
								}
							} );
							var $sections = $( this ).data( 'context' ).$ui.find( '.sections' );
							var $section = $sections.find( '.section-' + $( this ).parent().attr( 'rel' ) );
							// eslint-disable-next-line no-jquery/no-class-state
							var show = !$section.hasClass( 'section-visible' );
							$sections.find( '.section-visible' )
								.removeClass( 'section-visible' )
								.addClass( 'section-hidden' );

							$( this ).attr( 'aria-expanded', 'false' );
							$( this ).parent().parent().find( 'a' ).removeClass( 'current' );
							if ( show ) {
								$section
									.removeClass( 'section-hidden' )
									.attr( 'aria-expanded', 'true' )
									.addClass( 'section-visible' );

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

							// Save the currently visible section
							$.cookie(
								'wikiEditor-' + $( this ).data( 'context' ).instance + '-toolbar-section',
								show ? $section.attr( 'rel' ) : null,
								{ expires: 30, path: '/' }
							);

							e.preventDefault();
							return false;
						} );
				return $( '<span>' )
					.attr( {
						class: 'tab tab-' + id,
						rel: id
					} )
					.append( $link );
			},
			buildSection: function ( context, id, section ) {
				var $section = $( '<div>' ).attr( {
					class: section.type + ' section section-' + id,
					rel: id,
					id: 'wikiEditor-section-' + id
				} );
				var selected = $.cookie( 'wikiEditor-' + context.instance + '-toolbar-section' );
				var show = selected === id;

				toolbarModule.fn.reallyBuildSection( context, id, section, $section, section.deferLoad );

				// Show or hide section
				if ( id !== 'main' ) {
					$section.attr( 'aria-expanded', show ? 'true' : 'false' );

					if ( show ) {
						$section.addClass( 'section-visible' );
					} else {
						$section.addClass( 'section-hidden' );
					}
				}
				return $section;
			},
			reallyBuildSection: function ( context, id, section, $section, deferLoad ) {
				context.$textarea.trigger( 'wikiEditor-toolbar-buildSection-' + $section.attr( 'rel' ), [ section ] );
				switch ( section.type ) {
					case 'toolbar':
						if ( 'groups' in section ) {
							for ( var group in section.groups ) {
								$section.append(
									toolbarModule.fn.buildGroup( context, group, section.groups[ group ] )
								);
							}
						}
						break;
					case 'booklet':
						var $pages = $( '<div>' )
							.addClass( 'pages' )
							.attr( {
								tabindex: '0',
								role: 'listbox'
							} )
							.on( 'keydown', function ( event ) {
								var $selected = $pages.children().filter( function () {
									return $( this ).css( 'display' ) !== 'none';
								} );
								$.wikiEditor.modules.toolbar.fn.handleKeyDown( $selected.children().first(), event, $pages );
							} );
						var $index = $( '<div>' )
							.addClass( 'index' )
							.attr( {
								tabindex: '0',
								role: 'listbox'
							} )
							.on( 'keydown', function ( event ) {
								$.wikiEditor.modules.toolbar.fn.handleKeyDown( $index, event, $index );
							} );
						if ( 'pages' in section ) {
							for ( var page in section.pages ) {
								$pages.append(
									toolbarModule.fn.buildPage( context, page, section.pages[ page ], deferLoad )
								);
								$index.append(
									toolbarModule.fn.buildBookmark( context, page, section.pages[ page ] )
								);
							}
						}
						$section.append( $index ).append( $pages );
						toolbarModule.fn.updateBookletSelection( context, id, $pages, $index );
						break;
				}
			},
			updateBookletSelection: function ( context, id, $pages, $index ) {
				var cookie = 'wikiEditor-' + context.instance + '-booklet-' + id + '-page',
					selected = $.cookie( cookie );
				// Re-save cookie
				if ( selected !== null ) {
					$.cookie( cookie, selected, { expires: 30, path: '/' } );
				}
				var $selectedIndex = $index.find( '*[rel="' + selected + '"]' );
				if ( $selectedIndex.length === 0 ) {
					$selectedIndex = $index.children().eq( 0 );
					selected = $selectedIndex.attr( 'rel' );
				}
				$pages.children().hide();
				$pages.find( '*[rel="' + selected + '"]' ).show().trigger( 'loadPage' );
				$index.children().removeClass( 'current' );
				$selectedIndex.addClass( 'current' );
			},
			build: function ( context, config ) {
				var $tabs = $( '<div>' ).addClass( 'tabs' ).appendTo( context.modules.toolbar.$toolbar ),
					$sections = $( '<div>' ).addClass( 'sections' ).appendTo( context.modules.toolbar.$toolbar );
				context.modules.toolbar.$toolbar.append( $( '<div>' ).css( 'clear', 'both' ) );
				for ( var section in config ) {
					if ( section === 'main' ) {
						context.modules.toolbar.$toolbar.prepend(
							toolbarModule.fn.buildSection( context, section, config[ section ] )
						);
					} else {
						$sections.append( toolbarModule.fn.buildSection( context, section, config[ section ] ) );
						$tabs.append( toolbarModule.fn.buildTab( context, section, config[ section ] ) );
					}
				}
				setTimeout( function () {
					context.$textarea.trigger( 'wikiEditor-toolbar-doneInitialSections' );
					// Use hook for attaching new toolbar tools to avoid race conditions
					mw.hook( 'wikiEditor.toolbarReady' ).fire( context.$textarea );
				} );
			},
			handleKeyDown: function ( $element, event, $parent ) {
				var $currentItem = $element.find( '.wikiEditor-character-highlighted' ),
					optionOffset = $parent.find( '.wikiEditor-character-highlighted' ).offset(),
					optionTop = optionOffset ? optionOffset.top : 0,
					selectTop = $parent.offset().top;

				var $nextItem;
				switch ( event.keyCode ) {
					// Up arrow
					case 38:
						if ( $currentItem.length ) {
							$currentItem.removeClass( 'wikiEditor-character-highlighted' );
							$nextItem = $currentItem.prev();
							$nextItem = $nextItem.length ? $nextItem : $currentItem;
							$nextItem.addClass( 'wikiEditor-character-highlighted' );
						} else {
							$element.children().first().addClass( 'wikiEditor-character-highlighted' );
						}
						event.preventDefault();
						event.stopPropagation();
						break;
					// Down arrow
					case 40:
						if ( $currentItem.length ) {
							$currentItem.removeClass( 'wikiEditor-character-highlighted' );
							$nextItem = $currentItem.next();
							$nextItem = $nextItem.length ? $nextItem : $currentItem;
							$nextItem.addClass( 'wikiEditor-character-highlighted' );
						} else {
							$element.children().first().addClass( 'wikiEditor-character-highlighted' );
						}
						event.preventDefault();
						event.stopPropagation();
						break;
					// Enter
					case 13:
						$currentItem.trigger( 'click' );
						break;
				}
				$parent.scrollTop( $parent.scrollTop() + ( optionTop - selectTop ) );
			}
		}
	};

	module.exports = toolbarModule;

}() );