/*
Copyright (c) 2003-2010, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

CKEDITOR.plugins.add( 'contextmenu',
{
	requires : [ 'menu' ],

	beforeInit : function( editor )
	{
		editor.contextMenu = new CKEDITOR.plugins.contextMenu( editor );

		editor.addCommand( 'contextMenu',
			{
				exec : function()
					{
						editor.contextMenu.show( editor.document.getBody() );
					}
			});
	}
});

CKEDITOR.plugins.contextMenu = CKEDITOR.tools.createClass(
{
	$ : function( editor )
	{
		this.id = 'cke_' + CKEDITOR.tools.getNextNumber();
		this.editor = editor;
		this._.listeners = [];
		this._.functionId = CKEDITOR.tools.addFunction( function( commandName )
			{
				this._.panel.hide();
				editor.focus();
				editor.execCommand( commandName );
			},
			this);

		this.definition =
		{
			panel:
			{
				className : editor.skinClass + ' cke_contextmenu',
				attributes :
				{
					'aria-label' : editor.lang.contextmenu.options
				}
			}
		};
	},

	_ :
	{
		onMenu : function( offsetParent, corner, offsetX, offsetY )
		{
			var menu = this._.menu,
				editor = this.editor;

			if ( menu )
			{
				menu.hide();
				menu.removeAll();
			}
			else
			{
				menu = this._.menu = new CKEDITOR.menu( editor, this.definition );
				menu.onClick = CKEDITOR.tools.bind( function( item )
				{
					menu.hide();

					if ( item.onClick )
						item.onClick();
					else if ( item.command )
						editor.execCommand( item.command );

				}, this );

				menu.onEscape = function( keystroke )
				{
					var parent = this.parent;
					// 1. If it's sub-menu, restore the last focused item
					// of upper level menu.
					// 2. In case of a top-menu, close it.
					if ( parent )
					{
						parent._.panel.hideChild();
						// Restore parent block item focus.
						var parentBlock = parent._.panel._.panel._.currentBlock,
							parentFocusIndex =  parentBlock._.focusIndex;
						parentBlock._.markItem( parentFocusIndex );
					}
					else if ( keystroke == 27 )
					{
						this.hide();
						editor.focus();
					}
					return false;
				};
			}

			var listeners = this._.listeners,
				includedItems = [];

			var selection = this.editor.getSelection(),
				element = selection && selection.getStartElement();

			menu.onHide = CKEDITOR.tools.bind( function()
				{
					menu.onHide = null;

					if ( CKEDITOR.env.ie )
					{
						var selection = editor.getSelection();
						selection && selection.unlock();
					}

					this.onHide && this.onHide();
				},
				this );

			// Call all listeners, filling the list of items to be displayed.
			for ( var i = 0 ; i < listeners.length ; i++ )
			{
				var listenerItems = listeners[ i ]( element, selection );

				if ( listenerItems )
				{
					for ( var itemName in listenerItems )
					{
						var item = this.editor.getMenuItem( itemName );

						if ( item )
						{
							item.state = listenerItems[ itemName ];
							menu.add( item );
						}
					}
				}
			}

			// Don't show context menu with zero items.
			menu.items.length && menu.show( offsetParent, corner || ( editor.lang.dir == 'rtl' ? 2 : 1 ), offsetX, offsetY );
		}
	},

	proto :
	{
		addTarget : function( element, nativeContextMenuOnCtrl )
		{
			// Opera doesn't support 'contextmenu' event, we have duo approaches employed here:
			// 1. Inherit the 'button override' hack we introduced in v2 (#4530), while this require the Opera browser
			//  option 'Allow script to detect context menu/right click events' to be always turned on.
			// 2. Considering the fact that ctrl/meta key is not been occupied
			//  for multiple range selecting (like Gecko), we use this key
			//  combination as a fallback for triggering context-menu. (#4530)
			if ( CKEDITOR.env.opera )
			{
				var contextMenuOverrideButton;
				element.on( 'mousedown', function( evt )
				{
					evt = evt.data;
					if ( evt.$.button != 2 )
					{
						if ( evt.getKeystroke() == CKEDITOR.CTRL + 1 )
							element.fire( 'contextmenu', evt );
						return;
					}

					if ( nativeContextMenuOnCtrl
						 && ( evt.$.ctrlKey || evt.$.metaKey ) )
						return;

					var target = evt.getTarget();

					if ( !contextMenuOverrideButton )
					{
						var ownerDoc =  target.getDocument();
						contextMenuOverrideButton = ownerDoc.createElement( 'input' ) ;
						contextMenuOverrideButton.$.type = 'button' ;
						ownerDoc.getBody().append( contextMenuOverrideButton ) ;
					}

					contextMenuOverrideButton.setAttribute( 'style', 'position:absolute;top:' + ( evt.$.clientY - 2 ) +
						'px;left:' + ( evt.$.clientX - 2 ) +
						'px;width:5px;height:5px;opacity:0.01' );

				} );

				element.on( 'mouseup', function ( evt )
				{
					if ( contextMenuOverrideButton )
					{
						contextMenuOverrideButton.remove();
						contextMenuOverrideButton = undefined;
						// Simulate 'contextmenu' event.
						element.fire( 'contextmenu', evt.data );
					}
				} );
			}

			element.on( 'contextmenu', function( event )
				{
					var domEvent = event.data;

					if ( nativeContextMenuOnCtrl &&
					     // Safari on Windows always show 'ctrlKey' as true in 'contextmenu' event,
						// which make this property unreliable. (#4826)
					     ( CKEDITOR.env.webkit ? holdCtrlKey : domEvent.$.ctrlKey || domEvent.$.metaKey ) )
						return;

					// Selection will be unavailable after context menu shows up
					// in IE, lock it now.
					if ( CKEDITOR.env.ie )
					{
						var selection = this.editor.getSelection();
						selection && selection.lock();
					}

					// Cancel the browser context menu.
					domEvent.preventDefault();

					var offsetParent = domEvent.getTarget().getDocument().getDocumentElement(),
						offsetX = domEvent.$.clientX,
						offsetY = domEvent.$.clientY;

					CKEDITOR.tools.setTimeout( function()
						{
							this.show( offsetParent, null, offsetX, offsetY );
						},
						0, this );
				},
				this );

			if ( CKEDITOR.env.webkit )
			{
				var holdCtrlKey,
					onKeyDown = function( event )
					{
						holdCtrlKey = event.data.$.ctrlKey || event.data.$.metaKey;
					},
					resetOnKeyUp = function()
					{
						holdCtrlKey = 0;
					};

				element.on( 'keydown', onKeyDown );
				element.on( 'keyup', resetOnKeyUp );
				element.on( 'contextmenu', resetOnKeyUp );
			}
		},

		addListener : function( listenerFn )
		{
			this._.listeners.push( listenerFn );
		},

		show : function( offsetParent, corner, offsetX, offsetY )
		{
			this.editor.focus();
			this._.onMenu( offsetParent || CKEDITOR.document.getDocumentElement(), corner, offsetX || 0, offsetY || 0 );
		}
	}
});

/**
 * Whether to show the browser native context menu when the CTRL or the
 * META (Mac) key is pressed while opening the context menu.
 * @name CKEDITOR.config.browserContextMenuOnCtrl
 * @since 3.0.2
 * @type Boolean
 * @default true
 * @example
 * config.browserContextMenuOnCtrl = false;
 */