( function( tinymce ) {

	tinymce.ui.Factory.add( 'WPLinkPreview', tinymce.ui.Control.extend( {

		url: '#',

		renderHtml: function() {

			return (

				'<div id="' + this._id + '" class="wp-link-preview">' +

					'<a href="' + this.url + '" target="_blank" rel="noopener" tabindex="-1">' + this.url + '</a>' +

				'</div>'

			);

		},

		setURL: function( url ) {

			var index, lastIndex;

			if ( this.url !== url ) {

				this.url = url;

				url = window.decodeURIComponent( url );

				url = url.replace( /^(?:https?:)?\/\/(?:www\.)?/, '' );

				if ( ( index = url.indexOf( '?' ) ) !== -1 ) {

					url = url.slice( 0, index );

				}

				if ( ( index = url.indexOf( '#' ) ) !== -1 ) {

					url = url.slice( 0, index );

				}

				url = url.replace( /(?:index)?\.html$/, '' );

				if ( url.charAt( url.length - 1 ) === '/' ) {

					url = url.slice( 0, -1 );

				}

				// If nothing's left (maybe the URL was just a fragment), use the whole URL.

				if ( url === '' ) {

					url = this.url;

				}

				// If the URL is longer that 40 chars, concatenate the beginning (after the domain) and ending with '...'.

				if ( url.length > 40 && ( index = url.indexOf( '/' ) ) !== -1 && ( lastIndex = url.lastIndexOf( '/' ) ) !== -1 && lastIndex !== index ) {

					// If the beginning + ending are shorter that 40 chars, show more of the ending.

					if ( index + url.length - lastIndex < 40 ) {

						lastIndex = -( 40 - ( index + 1 ) );

					}

					url = url.slice( 0, index + 1 ) + '\u2026' + url.slice( lastIndex );

				}

				tinymce.$( this.getEl().firstChild ).attr( 'href', this.url ).text( url );

			}

		}

	} ) );

	tinymce.ui.Factory.add( 'WPLinkInput', tinymce.ui.Control.extend( {

		renderHtml: function() {

			return (

				'<div id="' + this._id + '" class="wp-link-input">' +

					'<input type="text" style="display:none" value="" />' +

				'</div>'

			);

		},

		setURL: function( url ) {

		},

		getURL: function() {

		},

		getLinkText: function() {

			if ( ! tinymce.trim( text ) ) {

				return '';

			}

			return text.replace( /[\r\n\t ]+/g, ' ' );

		},

		reset: function() {

			urlInput.value = '';

			urlInput.nextSibling.value = '';

		}

	} ) );

	tinymce.PluginManager.add( 'wplink', function( editor ) {

		var toolbar;

		var editToolbar;

		var previewInstance;

		var inputInstance;

		var linkNode;

		var doingUndoRedo;

		var doingUndoRedoTimer;

		var $ = window.jQuery;

		var emailRegex = /^(mailto:)?[a-z0-9._%+-]+@[a-z0-9][a-z0-9.-]*\.[a-z]{2,63}$/i;

		var urlRegex1 = /^https?:\/\/([^\s/?.#-][^\s\/?.#]*\.?)+(\/[^\s"]*)?$/i;

		var urlRegex2 = /^https?:\/\/[^\/]+\.[^\/]+($|\/)/i;

		var speak = ( typeof window.wp !== 'undefined' && window.wp.a11y && window.wp.a11y.speak ) ? window.wp.a11y.speak : function() {};

		var hasLinkError = false;

		function getSelectedLink() {

			var href, html,

				node = editor.selection.getStart(),

				link = editor.dom.getParent( node, 'a[href]' );

			if ( ! link ) {

				html = editor.selection.getContent({ format: 'raw' });

				if ( html && html.indexOf( '</a>' ) !== -1 ) {

					href = html.match( /href="([^">]+)"/ );

					if ( href && href[1] ) {

						link = editor.$( 'a[href="' + href[1] + '"]', node )[0];

					}

					if ( link ) {

						editor.selection.select( link );

					}

				}

			}

			return link;

		}

		function removePlaceholders() {

			editor.$( 'a' ).each( function( i, element ) {

				var $element = editor.$( element );

				if ( $element.attr( 'href' ) === '_wp_link_placeholder' ) {

					editor.dom.remove( element, true );

				} else if ( $element.attr( 'data-wplink-edit' ) ) {

					$element.attr( 'data-wplink-edit', null );

				}

			});

		}

		function removePlaceholderStrings( content, dataAttr ) {

			return content.replace( /(<a [^>]+>)([\s\S]*?)<\/a>/g, function( all, tag, text ) {

				if ( tag.indexOf( ' href="_wp_link_placeholder"' ) > -1 ) {

					return text;

				}

				if ( dataAttr ) {

					tag = tag.replace( / data-wplink-edit="true"/g, '' );

				}

				tag = tag.replace( / data-wplink-url-error="true"/g, '' );

				return tag + text + '</a>';

			});

		}

		function checkLink( node ) {

			var $link = editor.$( node );

			var href = $link.attr( 'href' );

			if ( ! href || typeof $ === 'undefined' ) {

				return;

			}

			hasLinkError = false;

			if ( /^http/i.test( href ) && ( ! urlRegex1.test( href ) || ! urlRegex2.test( href ) ) ) {

				hasLinkError = true;

				$link.attr( 'data-wplink-url-error', 'true' );

				speak( editor.translate( 'Warning: the link has been inserted but may have errors. Please test it.' ), 'assertive' );

			} else {

				$link.removeAttr( 'data-wplink-url-error' );

			}

		}

		editor.on( 'preinit', function() {

			if ( editor.wp && editor.wp._createToolbar ) {

				toolbar = editor.wp._createToolbar( [

					'wp_link_preview',

					'wp_link_edit',

					'wp_link_remove'

				], true );

				var editButtons = [

					'wp_link_input',

					'wp_link_apply'

				];

				if ( typeof window.wpLink !== 'undefined' ) {

					editButtons.push( 'wp_link_advanced' );

				}

				editToolbar = editor.wp._createToolbar( editButtons, true );

				editToolbar.on( 'show', function() {

					if ( typeof window.wpLink === 'undefined' || ! window.wpLink.modalOpen ) {

						window.setTimeout( function() {

							var element = editToolbar.$el.find( 'input.ui-autocomplete-input' )[0],

								selection = linkNode && ( linkNode.textContent || linkNode.innerText );

							if ( element ) {

								if ( ! element.value && selection && typeof window.wpLink !== 'undefined' ) {

									element.value = window.wpLink.getUrlFromSelection( selection );

								}

								if ( ! doingUndoRedo ) {

									element.focus();

									element.select();

								}

							}

						} );

					}

				} );

				editToolbar.on( 'hide', function() {

					if ( ! editToolbar.scrolling ) {

						editor.execCommand( 'wp_link_cancel' );

					}

				} );

			}

		} );

		editor.addCommand( 'WP_Link', function() {

			if ( tinymce.Env.ie && tinymce.Env.ie < 10 && typeof window.wpLink !== 'undefined' ) {

				window.wpLink.open( editor.id );

				return;

			}

			linkNode = getSelectedLink();

			editToolbar.tempHide = false;

			if ( ! linkNode ) {

				removePlaceholders();

				editor.execCommand( 'mceInsertLink', false, { href: '_wp_link_placeholder' } );

				linkNode = editor.$( 'a[href="_wp_link_placeholder"]' )[0];

				editor.nodeChanged();

			}

			editor.dom.setAttribs( linkNode, { 'data-wplink-edit': true } );

		} );

		editor.addCommand( 'wp_link_apply', function() {

			if ( editToolbar.scrolling ) {

				return;

			}

			var href, text;

			if ( linkNode ) {

				href = inputInstance.getURL();

				text = inputInstance.getLinkText();

				editor.focus();

				var parser = document.createElement( 'a' );

				parser.href = href;

				if ( 'javascript:' === parser.protocol || 'data:' === parser.protocol ) { // jshint ignore:line

					href = '';

				}

				if ( ! href ) {

					editor.dom.remove( linkNode, true );

					return;

				}

				if ( ! /^(?:[a-z]+:|#|\?|\.|\/)/.test( href ) && ! emailRegex.test( href ) ) {

					href = 'http://' + href;

				}

				editor.dom.setAttribs( linkNode, { href: href, 'data-wplink-edit': null } );

				if ( ! tinymce.trim( linkNode.innerHTML ) ) {

					editor.$( linkNode ).text( text || href );

				}

				checkLink( linkNode );

			}

			inputInstance.reset();

			editor.nodeChanged();

			// Audible confirmation message when a link has been inserted in the Editor.

			if ( typeof window.wpLinkL10n !== 'undefined' && ! hasLinkError ) {

				speak( window.wpLinkL10n.linkInserted );

			}

		} );

		editor.addCommand( 'wp_link_cancel', function() {

			inputInstance.reset();

			if ( ! editToolbar.tempHide ) {

				removePlaceholders();

			}

		} );

		editor.addCommand( 'wp_unlink', function() {

			editor.execCommand( 'unlink' );

			editToolbar.tempHide = false;

			editor.execCommand( 'wp_link_cancel' );

		} );

		// WP default shortcuts.

		editor.addShortcut( 'access+a', '', 'WP_Link' );

		editor.addShortcut( 'access+s', '', 'wp_unlink' );

		// The "de-facto standard" shortcut, see #27305.

		editor.addShortcut( 'meta+k', '', 'WP_Link' );

		editor.addButton( 'link', {

			icon: 'link',

			tooltip: 'Insert/edit link',

			cmd: 'WP_Link',

			stateSelector: 'a[href]'

		});

		editor.addButton( 'unlink', {

			icon: 'unlink',

			tooltip: 'Remove link',

			cmd: 'unlink'

		});

		editor.addMenuItem( 'link', {

			icon: 'link',

			text: 'Insert/edit link',