'use strict';

var express = require('express');
var router = express.Router();
var extend = require('node.extend');
var request = require('request');
var lxc = require('../lxc');

var timeoutEvents = {};
var ip2name = {};
var availContainers = [];
var usedContainers = [];

var exec = require('child_process').exec;

function sysExec(command, callback){
	command = new Buffer(command).toString('base64')
	command = 'ssh virt@104.236.77.157 "echo ' + command + '|base64 --decode|bash"';
	// command = 'unset XDG_SESSION_ID XDG_RUNTIME_DIR; cgm movepid all virt $$; ' + command;

	return exec(command, (function(callback){
		return function(err,data,stderr){
			if(callback){
				return callback(data, err, stderr);
			}
		}
	})(callback));
};

var getFreeMem = function(callback){

	return sysExec("python3 -c \"a=`head /proc/meminfo | grep MemAvail | grep -Po '\d+'`;t=`head /proc/meminfo | grep MemTotal | grep -Po '\d+'`;print(round(((t-a) / t)*100, 2))\"", callback);
};


var lxcTimeout = function(ip, time){
	var name = ip2name[ip];
	console.log(name)
	time = time || 900000; // 15 minutes
	var keys = Object.keys(timeoutEvents)
	if(keys.indexOf(name) !== -1){
		clearTimeout(timeoutEvents[name])
	}
	timeoutEvents[name] = setTimeout(function(){
		lxc.stop(name);
		startAll();
	}, time);
}


var runner = function(req, res, ip){
	lxcTimeout(ip);

	var httpOptions = {
		url:'http://' + ip + ':15000',
		body: JSON.stringify({
			code: req.body.code
		})
	};

	return request.post(httpOptions, function(error, response, body){
		body = JSON.parse(body);
		body['ip'] = ip.replace('10.0.', '');
		return res.json(body);
	});
};

router.get('/start/:name', function(req, res, next){
	return lxc.start(req.params.name, function(data){
		if(!data){
			return res.json({status: 500, name: req.params.name, message: data});
		}else{
			res.json({});
		}
	});
});

router.get('/live/:template/:name', function(req, res, next){
	return lxc.startEphemeral(req.params.name, req.params.template, function (data) {
		console.log('live', arguments);
		return res.json(data);
	});
});

router.get('/stop/:name', function(req, res, next){
	return lxc.stop(req.params.name, function(data){
		console.log('stop', arguments);
		if(data){
			return res.json({status: 500, name: req.params.name, message: data});
		}else{
			return res.json({status: 200});
		}
	});
});

router.get('/clone/:template/:name', function(req, res, next){
	return lxc.clone(req.params.name, req.params.template, function(data){
		console.log('clone', arguments);
		if( data.match(/Created container/) ){
			return res.json({status: 200});
		}else{
			return res.json({status: 500, message: data});
		}
	});
});

router.get('/destroy/:name', function(req, res, next){
	return lxc.destroy(req.params.name, function(data){
		console.log('destroy', arguments);
		if(data){
			return res.json({status: 500, message: data});
		}else{
			return res.json({status: 200});
		}
	});
});

router.get('/info/:name', function(req, res, next){
	return lxc.info(req.params.name, function(data){
		return res.json(data);
	});
});

router.get('/list', function(req, res, next) {
	return lxc.list(function(data){
		return res.json(data);
	});
});

router.post('/run/:ip?', function doRun(req, res, next){
	// check if server is

	return lxc.list(function(data){
		if(!req.params.ip) data = [];
		var ip = '10.0.'+ req.params.ip;
		var found = false;

		for(var idx=data.length; idx--;){
			if( data[idx]['ipv4'] === ip ){
				found = true;
				break;
			}
		}

		if(found){
			return runner(req, res, ip)
		}else{
			return runner(req, res, availContainers.pop());
		}
	});

});

// freeMem: 97700 totalmem 513818624 usedMem: 0
// freeMem: 420,472 totalmem 513,818,624 usedMem: 100
var startAll = function(){
	getFreeMem(function(usedMemPercent){

		if(usedMemPercent < 85 ){
			var name = 'crunner-'+(Math.random()*100).toString().replace('.','');
			return lxc.startEphemeral(name, 'crunner0', function(data){
				ip2name[data.ip] = name;
				availContainers.push(data.ip);
				return startAll();
			});
		}else{
			console.log('using', usedMemPercent, 'percent memory, stopping container creation!', availContainers.length, 'created');
		}
	});
}

startAll();

module.exports = router;