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	// queue to store un-delegated calls
	var callQueue = [];
	
	// util methods
	function getDelegateScriptUrl() {
		// load the delegate script based on stored version (got from aura nonce) or get latest version
		var url = "/lightning/lightning.out.delegate.js?v=" + getDelegateScriptVersion();
		
		// Extract the base path from our own <script> include to adjust for LC4VF/Communities/Sites
		var scripts = document.getElementsByTagName("script");
		for (var m = 0; m < scripts.length; m++) {
			var script = scripts[m].src;
			var i = script.indexOf("/lightning/lightning.out.js");
			if (i >= 0) {
				var basePath = script.substring(0, i);
				url = basePath + url;
				break;
			}
		}
		
		return url;
	}
	
	function getDelegateScriptVersion(){
		try {
			if(localStorage.lightningOutDelegateVersion){
				return localStorage.lightningOutDelegateVersion;
			}
		} catch (e) {}
		return (new Date()).getTime();
	}
	
	function loadDelegateScript() {
		var script = document.createElement('script');
		script.type = "text/javascript";
		script.src = getDelegateScriptUrl();
		script.onload = function() {
			delegateLoaded = true;
			while(callQueue.length) {
				$Lightning._delegate.use.apply(this, callQueue.shift());
			}
		}
		document.head.appendChild(script);
	}
	
	// load delegate
	loadDelegateScript();
	
	return {
		use: function() {
			var args = Array.prototype.slice.call(arguments);
			if (delegateLoaded) {
				return $Lightning._delegate.use.apply(this, args);
			} else {
				// queue the request
				return callQueue.push(args);
			}
		},
		createComponent: function() {
			return $Lightning._delegate.createComponent.apply(this, Array.prototype.slice.call(arguments));
		},
		getApplication: function() {
			return $Lightning._delegate.getApplication.apply(this, Array.prototype.slice.call(arguments));
		},
		lightningLoaded: function() {
			return $Lightning._delegate.lightningLoaded.apply(this, Array.prototype.slice.call(arguments));
		},
		ready: function() {
			return $Lightning._delegate.ready.apply(this, Array.prototype.slice.call(arguments));
		}
	}
})();