var http = require('http');
var modifier = process.env.MODIFIER;
if (modifier){
	modifier = require("./" + modifier );
	modifier.init();

	http.createServer(function(req,res){
		res.writeHead(200,{"Content-Type": "text/plain"});
		var data = modifier.data();
		var body = "";
		var globallabelstring = "";
		if (data.__labels){
			for (var label in data.__labels) {
				if (data.__labels.hasOwnProperty(label)){
					globallabelstring+=label + "=\"" + data.__labels[label] + "\",";
				}
			}
		}
		for (var prop in data) {
			if (prop != "__labels" && data.hasOwnProperty(prop)) {
				var labelstring = "";
				if (data[prop].labels){
					for (var label in data[prop].labels) {
						if (data[prop].labels.hasOwnProperty(label)){
							labelstring+=label + "=\"" + data[prop].labels[label] + "\",";
						}
					}
				}
				body+="# HELP " + prop + " " + data[prop].help + "\n";
				if (data[prop].type == "counter"){
					body+="# TYPE " + prop + " counter" + "\n";
					body+=prop + "{" + globallabelstring + labelstring + "}" + " " + data[prop].value.toString() + "\n";
				}else if (data[prop].type == "gauge"){
					body+="# TYPE " + prop + " gauge" + "\n";
					body+=prop + "{" + globallabelstring + labelstring + "}" + " " + data[prop].value.toString() + "\n";
				}else if (data[prop].type == "histogram"){
					body+="# TYPE " + prop + " histogram" + "\n";
					for (var le in data[prop].bucket) {
						if (data[prop].bucket.hasOwnProperty(le)){
							body+=prop + "_bucket{le=\""+ le + "\"," + globallabelstring + labelstring + "} " + data[prop].bucket[le].toString() + "\n";
						}
					}
					body+=prop + "_count{" + globallabelstring + labelstring + "} " + data[prop].count.toString()+ "\n";
					body+=prop + "_sum{" + globallabelstring + labelstring + "} " + data[prop].sum.toString()+ "\n";
				}else if (data[prop].type == "summary"){
					body+="# TYPE " + prop + " summary" + "\n";
					for (var q in data[prop].quantile) {
						if (data[prop].quantile.hasOwnProperty(q)){
							body+=prop + "{quantile=\""+ q + "\"," + globallabelstring + labelstring + "} " + data[prop].quantile[q].toString() + "\n";
						}
					}
					body+=prop + "_count{" + globallabelstring + labelstring + "} " + data[prop].count.toString()+ "\n";
					body+=prop + "_sum{" + globallabelstring + labelstring + "} " + data[prop].sum.toString()+ "\n";
				}
			}
		}
		res.end(body);
	}).listen(80);
} else {
	console.log("No modifier selected");
}