#!/usr/bin/perl

use strict;

use Net::SNMP qw(ticks_to_time TRANSLATE_NONE);
use DateTime;
use DateTime::Format::Strptime;

my $TIMEOUT = 30;
$SIG{ALRM} = sub { print "ERROR: No response\n"; exit 3; };
alarm($TIMEOUT);

my $warn_time = 365 * 5;

my $hostip=$ARGV[0];
my $community = $ARGV[1] || 'public';

my ($session, $error) = Net::SNMP->session(
   -hostname  => shift || $hostip,
   -community => shift || $community,
   -port      => shift || 161,
   -timeout   => 5,
);


if (!defined($session)) {
   printf("ERROR: %s.\n", $error);
   exit 1;
}

my $inputline = '1.3.6.1.4.1.318.1.1.1.2.1.3.0';

$session->translate(TRANSLATE_NONE);

my $result = $session->get_request(
   -varbindlist => [$inputline]
);

if (!defined($result)) {
   printf("ERROR: %s.\n", $session->error);
   $session->close;
   exit 2;
}

$session->close;

if (!defined($result->{$inputline})) {
    printf("ERROR: %s.\n", $session->error);
    $session->close;
    exit 2;
    }

my $value = $result->{$inputline};

my ($mm,$dd,$yy) = split(/\//,$value);

if ($yy <2000 ) { $yy+=2000; }

my $date = DateTime->new( year => $yy, month => $mm, day => $dd, time_zone => 'local');
my $today = DateTime->today(time_zone=>'local');
my $dur = $date->delta_days($today);

my $timeshift = $dur->in_units('days');
if ($timeshift > $warn_time) {
    printf("WARN: The batteries are too old. It's time to change: %s\n", $value);
    $session->close;
    exit 1;
    }

printf("Last Battery Replacement : %s\n",$value);

exit 0;