/**
 * @license Copyright (c) 2003-2014, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or http://ckeditor.com/license
 */

CKEDITOR.plugins.add( 'link', {
	requires: 'dialog,fakeobjects',
	lang: 'af,ar,bg,bn,bs,ca,cs,cy,da,de,el,en,en-au,en-ca,en-gb,eo,es,et,eu,fa,fi,fo,fr,fr-ca,gl,gu,he,hi,hr,hu,id,is,it,ja,ka,km,ko,ku,lt,lv,mk,mn,ms,nb,nl,no,pl,pt,pt-br,ro,ru,si,sk,sl,sq,sr,sr-latn,sv,th,tr,ug,uk,vi,zh,zh-cn', // %REMOVE_LINE_CORE%
	icons: 'anchor,anchor-rtl,link,unlink', // %REMOVE_LINE_CORE%
	hidpi: true, // %REMOVE_LINE_CORE%
	onLoad: function() {
		// Add the CSS styles for anchor placeholders.
		var iconPath = CKEDITOR.getUrl( this.path + 'images' + ( CKEDITOR.env.hidpi ? '/hidpi' : '' ) + '/anchor.png' ),
			baseStyle = 'background:url(' + iconPath + ') no-repeat %1 center;border:1px dotted #00f;background-size:16px;';

		var template = '.%2 a.cke_anchor,' +
			'.%2 a.cke_anchor_empty' +
			',.cke_editable.%2 a[name]' +
			',.cke_editable.%2 a[data-cke-saved-name]' +
			'{' +
				baseStyle +
				'padding-%1:18px;' +
				// Show the arrow cursor for the anchor image (FF at least).
				'cursor:auto;' +
			'}' +
			( CKEDITOR.plugins.link.synAnchorSelector ? ( 'a.cke_anchor_empty' +
			'{' +
				// Make empty anchor selectable on IE.
				'display:inline-block;' +
				// IE11 doesn't display empty inline-block elements.
				( CKEDITOR.env.ie && CKEDITOR.env.version > 10 ? 'min-height:16px;vertical-align:middle' : '' ) +
			'}'
			) : '' ) +
			'.%2 img.cke_anchor' +
			'{' +
				baseStyle +
				'width:16px;' +
				'min-height:15px;' +
				// The default line-height on IE.
				'height:1.15em;' +
				// Opera works better with "middle" (even if not perfect)
				'vertical-align:' + ( CKEDITOR.env.opera ? 'middle' : 'text-bottom' ) + ';' +
			'}';

		// Styles with contents direction awareness.
		function cssWithDir( dir ) {
			return template.replace( /%1/g, dir == 'rtl' ? 'right' : 'left' ).replace( /%2/g, 'cke_contents_' + dir );
		}

		CKEDITOR.addCss( cssWithDir( 'ltr' ) + cssWithDir( 'rtl' ) );
	},

	init: function( editor ) {
		var allowed = 'a[!href]',
			required = 'a[href]';

		if ( CKEDITOR.dialog.isTabEnabled( editor, 'link', 'advanced' ) )
			allowed = allowed.replace( ']', ',accesskey,charset,dir,id,lang,name,rel,tabindex,title,type]{*}(*)' );
		if ( CKEDITOR.dialog.isTabEnabled( editor, 'link', 'target' ) )
			allowed = allowed.replace( ']', ',target,onclick]' );

		// Add the link and unlink buttons.
		editor.addCommand( 'link', new CKEDITOR.dialogCommand( 'link', {
			allowedContent: allowed,
			requiredContent: required
		} ) );
		editor.addCommand( 'anchor', new CKEDITOR.dialogCommand( 'anchor', {
			allowedContent: 'a[!name,id]',
			requiredContent: 'a[name]'
		} ) );
		editor.addCommand( 'unlink', new CKEDITOR.unlinkCommand() );
		editor.addCommand( 'removeAnchor', new CKEDITOR.removeAnchorCommand() );

		editor.setKeystroke( CKEDITOR.CTRL + 76 /*L*/, 'link' );

		if ( editor.ui.addButton ) {
			editor.ui.addButton( 'Link', {
				label: editor.lang.link.toolbar,
				command: 'link',
				toolbar: 'links,10'
			} );
			editor.ui.addButton( 'Unlink', {
				label: editor.lang.link.unlink,
				command: 'unlink',
				toolbar: 'links,20'
			} );
			editor.ui.addButton( 'Anchor', {
				label: editor.lang.link.anchor.toolbar,
				command: 'anchor',
				toolbar: 'links,30'
			} );
		}

		CKEDITOR.dialog.add( 'link', this.path + 'dialogs/link.js' );
		CKEDITOR.dialog.add( 'anchor', this.path + 'dialogs/anchor.js' );

		editor.on( 'doubleclick', function( evt ) {
			var element = CKEDITOR.plugins.link.getSelectedLink( editor ) || evt.data.element;

			if ( !element.isReadOnly() ) {
				if ( element.is( 'a' ) ) {
					evt.data.dialog = ( element.getAttribute( 'name' ) && ( !element.getAttribute( 'href' ) || !element.getChildCount() ) ) ? 'anchor' : 'link';
					editor.getSelection().selectElement( element );
				} else if ( CKEDITOR.plugins.link.tryRestoreFakeAnchor( editor, element ) )
					evt.data.dialog = 'anchor';
			}
		} );

		// If the "menu" plugin is loaded, register the menu items.
		if ( editor.addMenuItems ) {
			editor.addMenuItems( {
				anchor: {
					label: editor.lang.link.anchor.menu,
					command: 'anchor',
					group: 'anchor',
					order: 1
				},

				removeAnchor: {
					label: editor.lang.link.anchor.remove,
					command: 'removeAnchor',
					group: 'anchor',
					order: 5
				},

				link: {
					label: editor.lang.link.menu,
					command: 'link',
					group: 'link',
					order: 1
				},

				unlink: {
					label: editor.lang.link.unlink,
					command: 'unlink',
					group: 'link',
					order: 5
				}
			} );
		}

		// If the "contextmenu" plugin is loaded, register the listeners.
		if ( editor.contextMenu ) {
			editor.contextMenu.addListener( function( element, selection ) {
				if ( !element || element.isReadOnly() )
					return null;

				var anchor = CKEDITOR.plugins.link.tryRestoreFakeAnchor( editor, element );

				if ( !anchor && !( anchor = CKEDITOR.plugins.link.getSelectedLink( editor ) ) )
					return null;

				var menu = {};

				if ( anchor.getAttribute( 'href' ) && anchor.getChildCount() )
					menu = { link: CKEDITOR.TRISTATE_OFF, unlink: CKEDITOR.TRISTATE_OFF };

				if ( anchor && anchor.hasAttribute( 'name' ) )
					menu.anchor = menu.removeAnchor = CKEDITOR.TRISTATE_OFF;

				return menu;
			} );
		}
	},

	afterInit: function( editor ) {
		// Register a filter to displaying placeholders after mode change.

		var dataProcessor = editor.dataProcessor,
			dataFilter = dataProcessor && dataProcessor.dataFilter,
			htmlFilter = dataProcessor && dataProcessor.htmlFilter,
			pathFilters = editor._.elementsPath && editor._.elementsPath.filters;

		if ( dataFilter ) {
			dataFilter.addRules( {
				elements: {
					a: function( element ) {
						var attributes = element.attributes;
						if ( !attributes.name )
							return null;

						var isEmpty = !element.children.length;

						if ( CKEDITOR.plugins.link.synAnchorSelector ) {
							// IE needs a specific class name to be applied
							// to the anchors, for appropriate styling.
							var ieClass = isEmpty ? 'cke_anchor_empty' : 'cke_anchor';
							var cls = attributes[ 'class' ];
							if ( attributes.name && ( !cls || cls.indexOf( ieClass ) < 0 ) )
								attributes[ 'class' ] = ( cls || '' ) + ' ' + ieClass;

							if ( isEmpty && CKEDITOR.plugins.link.emptyAnchorFix ) {
								attributes.contenteditable = 'false';
								attributes[ 'data-cke-editable' ] = 1;
							}
						} else if ( CKEDITOR.plugins.link.fakeAnchor && isEmpty )
							return editor.createFakeParserElement( element, 'cke_anchor', 'anchor' );

						return null;
					}
				}
			} );
		}

		if ( CKEDITOR.plugins.link.emptyAnchorFix && htmlFilter ) {
			htmlFilter.addRules( {
				elements: {
					a: function( element ) {
						delete element.attributes.contenteditable;
					}
				}
			} );
		}

		if ( pathFilters ) {
			pathFilters.push( function( element, name ) {
				if ( name == 'a' ) {
					if ( CKEDITOR.plugins.link.tryRestoreFakeAnchor( editor, element ) || ( element.getAttribute( 'name' ) && ( !element.getAttribute( 'href' ) || !element.getChildCount() ) ) )
						return 'anchor';

				}
			} );
		}
	}
} );

/**
 * Set of Link plugin helpers.
 *
 * @class
 * @singleton
 */
CKEDITOR.plugins.link = {
	/**
	 * Get the surrounding link element of the current selection.
	 *
	 *		CKEDITOR.plugins.link.getSelectedLink( editor );
	 *
	 *		// The following selections will all return the link element.
	 *
	 *		<a href="#">li^nk</a>
	 *		<a href="#">[link]</a>
	 *		text[<a href="#">link]</a>
	 *		<a href="#">li[nk</a>]
	 *		[<b><a href="#">li]nk</a></b>]
	 *		[<a href="#"><b>li]nk</b></a>
	 *
	 * @since 3.2.1
	 * @param {CKEDITOR.editor} editor
	 */
	getSelectedLink: function( editor ) {
		var selection = editor.getSelection();
		var selectedElement = selection.getSelectedElement();
		if ( selectedElement && selectedElement.is( 'a' ) )
			return selectedElement;

		var range = selection.getRanges()[ 0 ];

		if ( range ) {
			range.shrink( CKEDITOR.SHRINK_TEXT );
			return editor.elementPath( range.getCommonAncestor() ).contains( 'a', 1 );
		}
		return null;
	},

	/**
	 * Collects anchors available in the editor (i.e. used by the Link plugin).
	 * Note that the scope of search is different for inline (the "global" document) and
	 * classic (`iframe`-based) editors (the "inner" document).
	 *
	 * @since 4.3.3
	 * @param {CKEDITOR.editor} editor
	 * @returns {CKEDITOR.dom.element[]} An array of anchor elements.
	 */
	getEditorAnchors: function( editor ) {
		var editable = editor.editable(),

			// The scope of search for anchors is the entire document for inline editors
			// and editor's editable for classic editor/divarea (#11359).
			scope = ( editable.isInline() && !editor.plugins.divarea ) ? editor.document : editable,

			links = scope.getElementsByTag( 'a' ),
			anchors = [],
			i = 0,
			item;

		// Retrieve all anchors within the scope.
		while ( ( item = links.getItem( i++ ) ) ) {
			if ( item.data( 'cke-saved-name' ) || item.hasAttribute( 'name' ) ) {
				anchors.push( {
					name: item.data( 'cke-saved-name' ) || item.getAttribute( 'name' ),
					id: item.getAttribute( 'id' )
				} );
			}
		}

		// Retrieve all "fake anchors" within the scope.
		if ( this.fakeAnchor ) {
			var imgs = scope.getElementsByTag( 'img' );

			i = 0;

			while ( ( item = imgs.getItem( i++ ) ) ) {
				if ( ( item = this.tryRestoreFakeAnchor( editor, item ) ) ) {
					anchors.push( {
						name: item.getAttribute( 'name' ),
						id: item.getAttribute( 'id' )
					} );
				}
			}
		}

		return anchors;
	},

	/**
	 * Opera and WebKit do not make it possible to select empty anchors. Fake
	 * elements must be used for them.
	 *
	 * @readonly
	 * @property {Boolean}
	 */
	fakeAnchor: CKEDITOR.env.opera || CKEDITOR.env.webkit,

	/**
	 * For browsers that do not support CSS3 `a[name]:empty()`. Note that IE9 is included because of #7783.
	 *
	 * @readonly
	 * @property {Boolean}
	 */
	synAnchorSelector: CKEDITOR.env.ie,

	/**
	 * For browsers that have editing issues with an empty anchor.
	 *
	 * @readonly
	 * @property {Boolean}
	 */
	emptyAnchorFix: CKEDITOR.env.ie && CKEDITOR.env.version < 8,

	/**
	 * Returns an element representing a real anchor restored from a fake anchor.
	 *
	 * @param {CKEDITOR.editor} editor
	 * @param {CKEDITOR.dom.element} element
	 * @returns {CKEDITOR.dom.element} Restored anchor element or nothing if the
	 * passed element was not a fake anchor.
	 */
	tryRestoreFakeAnchor: function( editor, element ) {
		if ( element && element.data( 'cke-real-element-type' ) && element.data( 'cke-real-element-type' ) == 'anchor' ) {
			var link = editor.restoreRealElement( element );
			if ( link.data( 'cke-saved-name' ) )
				return link;
		}
	}
};

// TODO Much probably there's no need to expose these as public objects.

CKEDITOR.unlinkCommand = function() {};
CKEDITOR.unlinkCommand.prototype = {
	exec: function( editor ) {
		var style = new CKEDITOR.style( { element: 'a', type: CKEDITOR.STYLE_INLINE, alwaysRemoveElement: 1 } );
		editor.removeStyle( style );
	},

	refresh: function( editor, path ) {
		// Despite our initial hope, document.queryCommandEnabled() does not work
		// for this in Firefox. So we must detect the state by element paths.

		var element = path.lastElement && path.lastElement.getAscendant( 'a', true );

		if ( element && element.getName() == 'a' && element.getAttribute( 'href' ) && element.getChildCount() )
			this.setState( CKEDITOR.TRISTATE_OFF );
		else
			this.setState( CKEDITOR.TRISTATE_DISABLED );
	},

	contextSensitive: 1,
	startDisabled: 1,
	requiredContent: 'a[href]'
};

CKEDITOR.removeAnchorCommand = function() {};
CKEDITOR.removeAnchorCommand.prototype = {
	exec: function( editor ) {
		var sel = editor.getSelection(),
			bms = sel.createBookmarks(),
			anchor;
		if ( sel && ( anchor = sel.getSelectedElement() ) && ( CKEDITOR.plugins.link.fakeAnchor && !anchor.getChildCount() ? CKEDITOR.plugins.link.tryRestoreFakeAnchor( editor, anchor ) : anchor.is( 'a' ) ) )
			anchor.remove( 1 );
		else {
			if ( ( anchor = CKEDITOR.plugins.link.getSelectedLink( editor ) ) ) {
				if ( anchor.hasAttribute( 'href' ) ) {
					anchor.removeAttributes( { name: 1, 'data-cke-saved-name': 1 } );
					anchor.removeClass( 'cke_anchor' );
				} else
					anchor.remove( 1 );
			}
		}
		sel.selectBookmarks( bms );
	},
	requiredContent: 'a[name]'
};

CKEDITOR.tools.extend( CKEDITOR.config, {
	/**
	 * Whether to show the Advanced tab in the Link dialog window.
	 *
	 * @cfg {Boolean} [linkShowAdvancedTab=true]
	 * @member CKEDITOR.config
	 */
	linkShowAdvancedTab: true,

	/**
	 * Whether to show the Target tab in the Link dialog window.
	 *
	 * @cfg {Boolean} [linkShowTargetTab=true]
	 * @member CKEDITOR.config
	 */
	linkShowTargetTab: true
} );
