#!/opt/ActivePerl-5.12/bin/perl
use strict;
use warnings;

use Tkx;
Tkx::package_require('tile');
my $mw = Tkx::widget->new(".");

use IO::Socket;
my $server = IO::Socket::INET->new(
    LocalPort => 7777,
    Type      => SOCK_STREAM,
    Reuse     => 1,
    Listen    => 3
);

my $log = $mw->new_tk__text(
    -height => 10,
    -width  => 60,
    -wrap   => 'none'
);
$log->g_grid( -column => 0, -row => 0 );

Tkx::fconfigure($server, -blocking => 0);
Tkx::fileevent( $server, readable => [\&new_connection, \$server]  );
Tkx::MainLoop();

sub new_connection {
    my $listen = shift;
    my $client = $listen->accept() or warn "Can't accept connection";
    Tkx::fconfigure($client, -blocking => 0);
    Tkx::fileevent( $client, readable =>[\&handle_connection, \$client]  );
    $log->insert( 'end', "connected\n" );
    $log->see('end');
    Tkx::update();
}

sub handle_connection {
    my ($client) = shift;
    my $message = <$client>;
    if ( defined $message and $message !~ /^quit/ ) {
        $message =~ s/[\r\n]+$//;
        $log->insert( 'end', "$message\n" );
        $log->see('end');
        Tkx::update();
    }
    else {
        print "connection closed\n";
        $log->insert( 'end', "connection closed\n" );
        $log->see('end');
        Tkx::update();
        $client->close();
    }
}