<?php

namespace CmtsBundle\Command;

use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class PingCommand  extends ContainerAwareCommand
{

    protected function configure()
    {
        $this
            ->setName('ping')
            ->setDescription('Ping to host and return SLA metrics')
            ->setHelp('Se requieren parámetros para poder realizar la correcta consulta.')
            ->setDefinition(array(
                new InputArgument('ip', InputArgument::OPTIONAL,"IP"),
                new InputOption('timeout', null, InputOption::VALUE_NONE,"Timeout", null),
                new InputOption('interval', null, InputOption::VALUE_NONE,"Interval", null),
                new InputOption('count', null, InputOption::VALUE_NONE,"Count", null)
            ))
        ;
    }

    /**
     * @param InputInterface $input
     * @param OutputInterface $output
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $ip = $input->getArgument('ip');
        
        if(!$ip) return $output->writeln(json_encode(array('message' => 'IP is required')));
        
        $timeout = $input->getOption('timeout');
        $interval = $input->getOption('interval');
        $count = $input->getOption('count');

        $data = $this->ping($ip, $timeout, $interval, $count);
        if(!is_array($data)) {
            $data = array();
        }

        $output->writeln(json_encode($data));
    }


    function ping($ip, $timeout = 1, $int = 0.5, $i = 5) {
        
        if(! $timeout ) $timeout = 1;
        if(! $int ) $int = 0.5;
        if(! $i ) $i = 5;


        /* ICMP ping packet with a pre-calculated checksum */
        $package = "\x08\x00\x7d\x4b\x00\x00\x00\x00PingHost";
        $result = array();
        $socket  = socket_create(AF_INET, SOCK_RAW, 1);
        socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array('sec' => $timeout, 'usec' => 0));
        socket_connect($socket, $ip, null);

        $n = $c = $total = 0; 
        $jitter = array();
        $last = null;

        for($a = 1; $a <= $i; $a++) {
            $ts = microtime(true);
            socket_send($socket, $package, strLen($package), 0);
            if (socket_read($socket, 255)) {
                $r = ((microtime(true) - $ts) / 2) * 1000;
                if(is_null($last)) {
                    $last = $r;
                } else {
                    $jitter[] = abs(($last - $r));
                }
                $total += $r;
                $result[] = $r;
                $c++;
            } else {
                $result[] = false;
                $n++;
            }

            if ($int< 1) {usleep($int * 1000000);}else{sleep($int);}

        }

        socket_close($socket);

        $data = array();

        if($c > 0) {
            $data['latency'] = round(($total) / $c,2);
        }
        if($jitter) {
            $data['jitter'] = round(array_sum($jitter) / count($jitter),2);
        }
        if($i > 0) {
            $data['loss'] = round(($n / $i) * 100,2);
        }

        return $data;
    }
}