var JsonpQueue = {
		pendingCallIDs: {},
		callInProgress: 0
};

JsonpQueue.cancelAll = function() {
	JsonpQueue.pendingCallIDs = {};
};

JsonpQueue.call = function(url, onDone, onError, debug) {
	if (JsonpQueue.callInProgress == 0) {
		document.body.style.cursor = "progress";
	}
	JsonpQueue.callInProgress++;

	var callbackID = new Date().getTime() + "x" + Math.floor(Math.random() * 1000);
	var script = document.createElement("script");
	script.setAttribute('onerror', 'err' + callbackID + '();');

	url += (url.indexOf("?") < 0 ? "?" : "&") + "callback=cb" + callbackID;
	script.setAttribute('src', url);


	var cleanup = function() {
		JsonpQueue.callInProgress--;
		if (JsonpQueue.callInProgress == 0) {
			document.body.style.cursor = "auto";
		}

		if (!(debug)) {
			script.parentNode.removeChild(script);
		}

		try {
			delete window["cb" + callbackID];
			delete window["err" + callbackID];
		} catch (e) {
			// IE doesn't seem to allow calling delete on window
			window["cb" + callbackID] = undefined;
			window["err" + callbackID] = undefined;
		}

		if (callbackID in JsonpQueue.pendingCallIDs) {
			delete JsonpQueue.pendingCallIDs[callbackID];
			return true;
		} else {
			return false;
		}
	};

	var callback = function(o) {
		if (cleanup()) {
			try {
				onDone(o);
			} catch (e) {
				log(e);
			}
		}
	};
	var error = function() {
		if (cleanup()) {
			if (typeof onError == "function") {
				try {
					onError(url);
				} catch (e) {
					log(e);
				}
			}
		}
	};

	window["cb" + callbackID] = callback;
	window["err" + callbackID] = error;

	JsonpQueue.pendingCallIDs[callbackID] = true;
	document.getElementsByTagName("head")[0].appendChild(script);
};

JsonpQueue.queryOne = function(query, onDone, onError, debug) {

	var url ;//= ParallaxConfig.corpusBaseUrl + 'api/service/mqlread?queries=' + encodeURIComponent(q);
	var funcnm ;
	var onDone5= function(funcname,modifiedquery){

		url=ParallaxConfig.corpusBaseUrl + encodeURIComponent(config.endpoint+"?default-graph-uri="+config.graph+"&query=")+encodeURIComponent(escape(modifiedquery))+encodeURIComponent("&format=application%2Fsparql-results%2Bjson&debug=on");
		funcnm=funcname;

	};

	translator.translatequery(query,onDone5);

	//  var q = JSON.stringify({ "q1" : { "query" : query } });
	var onDone2 = function(o) {
		if (o.q1.code == "/api/status/error") {
			if (typeof onError == "function") {
				onError(o.q1.messages[0].message, query);
			}
		} else { 
			onDone(o.q1);
		}
	};
	var onError2 = function() {
		if (typeof onError == "function") {
			onError("Unknown", query);
		}
	}
	var onDone3= function(o){	window[funcnm](o,onDone2);//translation.formatResult(o,onDone2);
	}


	JsonpQueue.call(url, onDone3, onError2, debug);
};