var log = require('hlogger').createLogger("monitor");



function ntokb(n) {
	var suffix = ["B","KB","MB","GB"];
	var si = 0;
	while( n> 1024 && si< suffix.length) {
		n/=1024;
		si++;
	}
	return n.toFixed(2) + " " +suffix[si];
}

var monitor = {
	
	bundleStart(context) {
		this.context = context;
		log.info("Bundle monitor started");
		this.registerCommands(context);
	},

	registerCommands(context) {
		context.events
			.channel('core-shell:cmd')
			.on('stat',(req,res,e) => {
				this.showStat(res); // Should pass stdout
			})
			.on('gc',(req,res,e) => {
				gc();
			});
		
		// listen from command from ourselves
		/*context.on('core-shell:cmd:stat',(req,res,e) => {
				this.showStat(res); // Should pass stdout
		}).on('core-shell:cmd:gc',(req,res,e) => {
			gc();
		})
		context.on('core-shell:cmd:test',(req,res,e) => {
		});/**/
	},
	showStat(res) {
		var context = this.context;
		var obj = process.memoryUsage();
		if(res == undefined) res = process.stdout;

		res.write("Memory Rss: " + ntokb(obj.rss)
				 +" Total: " + ntokb(obj.heapTotal)
				 +" Used: " + ntokb(obj.heapUsed) +"\n");

		// Sum events
		var nevents = 0;
		context.manager.eventual._events.ctx.forEach((c) => {
			nevents += Object.keys(c.listeners).length;
		});
		res.write("Events: " + nevents + "\n");

		// Weird?
		/*res.write("Modules registered: " + context.manager.stat.modulesRegistered
						+" Modules UnRegistered: " + context.manager.stat.modulesUnRegistered
						+" events emitted: " + context.manager.events.stat.emitted
						+" events called: " + context.manager.events.stat.called
						+" events tried: " + context.manager.events.stat.tried + "\n");*/
	},
	// Human readable stat
	getStat() {
		var obj = {};
		var mem = process.memoryUsage();

		obj.mem = {
			rss: ntokb(mem.rss),
			heapTotal: ntokb(mem.heapTotal),
			heapUsed: ntokb(mem.heapUsed),
		}
		return obj;
	}




};

module.exports = monitor;