use File::Spec;
use IO::Socket;
use IO::Select;
use Win32::API;
use Win32;
use Win32::Daemon;
use strict;
use warnings;
my $programmpfad = $0; 
$programmpfad =~ s/[^\\]*?$//;
use Win32::Daemon::Simple
        Service => 'Go Back!Up',
        Name => 'Go Back!Up Service',
        Version => 'RC2.0',
        Info => {
                display =>  'Go Back!Up Service',
                description => 'Backup Programm',
                user    =>  '',
                pwd     =>  '',
                interactive => '1',
        },
        Params => {
                Tick => 0,
                Talkative => 0,
                Interval => 1,
                LogFile => "$programmpfad\\log\\GoBackUp.log",
                Description => <<'*END*',m 
*END*
        },
        param_modify => {
                LogFile => sub {File::Spec->rel2abs($_[0])},
                tAlkative => sub {undef},
        };

LogNT("Running as ".SERVICEID);
ServiceLoop(\&doSomething);
Log("Going down");
exit;
sub doSomething 
    {
    my $pid = fork();
    if($pid == 0)
        {
        my $server = IO::Socket::INET->new(
                                        LocalPort => 2005,
                                        type => SOCK_STREAM,
                                        Reuse => 1,
                                        Listen => 10
                                        ) or die "Server läuft nicht: $@\n";
        my $select = IO::Select->new($server);
        while(my @readable = $select->can_read) 
            {
                foreach my $socket (@readable) 
                    {
                    if($socket == $server) 
                        {
                        my $client = $socket->accept;
                        print "New client connects\n";
                        $select->add($client);
                        $client->print("Welcome\n");
                        }
                    else 
                        {
                        my $computername = $socket->getline;
                        $computername =~ s!\r?\n$!!g; # Zeilenumbruch entfernen
                        if (defined $computername)
                            {
                            chomp $computername;
                            my $WindowAvailable ="";
                            $WindowAvailable = FindWindow("$computername");
                            print "$WindowAvailable\n";
                            if ($WindowAvailable == 0)
                                {
                                #$client->print ("Window ist nicht vorhanden\n");
                                
                                system "start \"$computername\" cmd.exe";
                                $socket->print("reconnect\n");
                                $socket->print("port=12346\n");
                                #delete_socket($select, $socket);
                                }
                            else
                                {
                                $socket->print ("Window ist vorhanden\n");
                                $socket->print("process still running\n");
                                $socket->print("port=2005\n");
                                }
                            }
                    else
                        {
                        print "Client says: [$computername]\n";
                        delete_socket($select, $socket);
                        }
                    } 
                }
            
    
            sub FindWindow
                {
                my $WindowName = shift(@_);
                chomp $WindowName;
                print "$WindowName";
                my $FindWindow = new Win32::API('user32', 'FindWindow', ['P','P'], 'N');# or die print "$!";
                my $name = 'Telnet 127.0.0.1';
                my $class = 0;
                my $topHwnd = $FindWindow->Call($class, $WindowName);
                print "$topHwnd\n";
                return $topHwnd;
                    }
        
            sub delete_socket 
                {
                my ($sel, $sock) = @_;
                $sel->remove($sock);
                $sock->close;
                }
            }
        }
    else
        {
      if (Win32::Daemon::State() == SERVICE_STOP_PENDING)
        {
        kill(0);
        CORE::exit;
        Win32::Daemon::State(SERVICE_STOPPED);
        Win32::Daemon::StopService();
        exit 0;
        }
    }    
    }