/**
   * Package: svgedit.contextmenu
   * 
   * Licensed under the Apache License, Version 2
   * 
   * Author: Adam Bender
   */
  // Dependencies:
  // 1) jQuery (for dom injection of context menus)
  var svgedit = svgedit || {};
  (function() {
  	var self = this;
  	if (!svgedit.contextmenu) {
  		svgedit.contextmenu = {};
  	}
  	self.contextMenuExtensions = {}
  	var addContextMenuItem = function(menuItem) {
  		// menuItem: {id, label, shortcut, action}
  		if (!menuItemIsValid(menuItem)) {
  			console
  					.error("Menu items must be defined and have at least properties: id, label, action, where action must be a function");
  			return;
  		}
  		if (menuItem.id in self.contextMenuExtensions) {
  			console.error('Cannot add extension "' + menuItem.id
  					+ '", an extension by that name already exists"');
  			return;
  		}
  		// Register menuItem action, see below for deferred menu dom injection
  		console.log("Registed contextmenu item: {id:"+ menuItem.id+", label:"+menuItem.label+"}");
  		self.contextMenuExtensions[menuItem.id] = menuItem;
  		//TODO: Need to consider how to handle custom enable/disable behavior
  	}
  	var hasCustomHandler = function(handlerKey) {
  		return self.contextMenuExtensions[handlerKey] && true;
  	}
  	var getCustomHandler = function(handlerKey) {
  		return self.contextMenuExtensions[handlerKey].action;
  	}
  	var injectExtendedContextMenuItemIntoDom = function(menuItem) {
  		if (Object.keys(self.contextMenuExtensions).length == 0) {
  			// all menuItems appear at the bottom of the menu in their own container.
  			// if this is the first extension menu we need to add the separator.
  			$("#cmenu_canvas").append("<li class='separator'>");
  		}
  		var shortcut = menuItem.shortcut || "";
  		$("#cmenu_canvas").append("<li class='disabled'><a href='#" + menuItem.id + "'>"                   
  									+ menuItem.label + "<span class='shortcut'>"
  									+ shortcut + "</span></a></li>");
  	}
  
  	var menuItemIsValid = function(menuItem) {
  		return menuItem && menuItem.id && menuItem.label && menuItem.action && typeof menuItem.action == 'function';
  	}
  	
  	// Defer injection to wait out initial menu processing. This probably goes away once all context
  	// menu behavior is brought here.
  	svgEditor.ready(function() {
  		for (menuItem in contextMenuExtensions) {
  			injectExtendedContextMenuItemIntoDom(contextMenuExtensions[menuItem]);
  		}
  	});
  	svgedit.contextmenu.resetCustomMenus = function(){self.contextMenuExtensions = {}}
  	svgedit.contextmenu.add = addContextMenuItem;
  	svgedit.contextmenu.hasCustomHandler = hasCustomHandler;
  	svgedit.contextmenu.getCustomHandler = getCustomHandler;
  })();