/*
Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

CKEDITOR.plugins.add( 'link',
{
	init : function( editor )
	{
		// Add the link and unlink buttons.
		editor.addCommand( 'link', new CKEDITOR.dialogCommand( 'link' ) );
		editor.addCommand( 'anchor', new CKEDITOR.dialogCommand( 'anchor' ) );
		editor.addCommand( 'unlink', new CKEDITOR.unlinkCommand() );
		editor.addCommand( 'removeAnchor', new CKEDITOR.removeAnchorCommand() );
		editor.ui.addButton( 'Link',
			{
				label : editor.lang.link.toolbar,
				command : 'link'
			} );
		editor.ui.addButton( 'Unlink',
			{
				label : editor.lang.unlink,
				command : 'unlink'
			} );
		editor.ui.addButton( 'Anchor',
			{
				label : editor.lang.anchor.toolbar,
				command : 'anchor'
			} );
		CKEDITOR.dialog.add( 'link', this.path + 'dialogs/link.js' );
		CKEDITOR.dialog.add( 'anchor', this.path + 'dialogs/anchor.js' );

		// Add the CSS styles for anchor placeholders.

		var side = ( editor.lang.dir == 'rtl' ? 'right' : 'left' );
		var basicCss =
			'background:url(' + CKEDITOR.getUrl( this.path + 'images/anchor.gif' ) + ') no-repeat ' + side + ' center;' +
			'border:1px dotted #00f;';

		editor.addCss(
			'a.cke_anchor,a.cke_anchor_empty' +
			// IE6 breaks with the following selectors.
			( ( CKEDITOR.env.ie && CKEDITOR.env.version < 7 ) ? '' :
				',a[name],a[data-cke-saved-name]' ) +
			'{' +
				basicCss +
				'padding-' + side + ':18px;' +
				// Show the arrow cursor for the anchor image (FF at least).
				'cursor:auto;' +
			'}' +
			( CKEDITOR.env.ie ? (
				'a.cke_anchor_empty' +
				'{' +
					// Make empty anchor selectable on IE.
					'display:inline-block;' +
				'}'
				) : '' ) +
			'img.cke_anchor' +
			'{' +
				basicCss +
				'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' ) + ';' +
			'}');

		// Register selection change handler for the unlink button.
		 editor.on( 'selectionChange', function( evt )
			{
				if ( editor.readOnly )
					return;

				/*
				 * Despite our initial hope, document.queryCommandEnabled() does not work
				 * for this in Firefox. So we must detect the state by element paths.
				 */
				var command = editor.getCommand( 'unlink' ),
					element = evt.data.path.lastElement && evt.data.path.lastElement.getAscendant( 'a', true );
				if ( element && element.getName() == 'a' && element.getAttribute( 'href' ) && element.getChildCount() )
					command.setState( CKEDITOR.TRISTATE_OFF );
				else
					command.setState( CKEDITOR.TRISTATE_DISABLED );
			} );

		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.anchor.menu,
						command : 'anchor',
						group : 'anchor',
						order : 1
					},

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

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

					unlink :
					{
						label : editor.lang.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';
						}
					}
				});
		}
	},

	requires : [ 'fakeobjects' ]
} );

CKEDITOR.plugins.link =
{
	/**
	 *  Get the surrounding link element of current selection.
	 * @param editor
	 * @example CKEDITOR.plugins.link.getSelectedLink( editor );
	 * @since 3.2.1
	 * The following selection will all return the link element.
	 *	 <pre>
	 *  <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>
	 * </pre>
	 */
	getSelectedLink : function( editor )
	{
		try
		{
			var selection = editor.getSelection();
			if ( selection.getType() == CKEDITOR.SELECTION_ELEMENT )
			{
				var selectedElement = selection.getSelectedElement();
				if ( selectedElement.is( 'a' ) )
					return selectedElement;
			}

			var range = selection.getRanges( true )[ 0 ];
			range.shrink( CKEDITOR.SHRINK_TEXT );
			var root = range.getCommonAncestor();
			return root.getAscendant( 'a', true );
		}
		catch( e ) { return null; }
	},

	// Opera and WebKit don't make it possible to select empty anchors. Fake
	// elements must be used for them.
	fakeAnchor : CKEDITOR.env.opera || CKEDITOR.env.webkit,

	// For browsers that don't support CSS3 a[name]:empty(), note IE9 is included because of #7783.
	synAnchorSelector : CKEDITOR.env.ie,

	// For browsers that have editing issue with empty anchor.
	emptyAnchorFix : CKEDITOR.env.ie && CKEDITOR.env.version < 8,

	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;
		}
	}
};

CKEDITOR.unlinkCommand = function(){};
CKEDITOR.unlinkCommand.prototype =
{
	/** @ignore */
	exec : function( editor )
	{
		/*
		 * execCommand( 'unlink', ... ) in Firefox leaves behind <span> tags at where
		 * the <a> was, so again we have to remove the link ourselves. (See #430)
		 *
		 * TODO: Use the style system when it's complete. Let's use execCommand()
		 * as a stopgap solution for now.
		 */
		var selection = editor.getSelection(),
			bookmarks = selection.createBookmarks(),
			ranges = selection.getRanges(),
			rangeRoot,
			element;

		for ( var i = 0 ; i < ranges.length ; i++ )
		{
			rangeRoot = ranges[i].getCommonAncestor( true );
			element = rangeRoot.getAscendant( 'a', true );
			if ( !element )
				continue;
			ranges[i].selectNodeContents( element );
		}

		selection.selectRanges( ranges );
		editor.document.$.execCommand( 'unlink', false, null );
		selection.selectBookmarks( bookmarks );
	},

	startDisabled : true
};

CKEDITOR.removeAnchorCommand = function(){};
CKEDITOR.removeAnchorCommand.prototype =
{
	/** @ignore */
	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 );
	}
};

CKEDITOR.tools.extend( CKEDITOR.config,
{
	linkShowAdvancedTab : true,
	linkShowTargetTab : true
} );
