#!/usr/bin/perl

#use strict;
use IO::Socket;
use File::Path;
use POSIX qw(:signal_h WNOHANG);
use Sys::Syslog qw(:DEFAULT setlogsock);

my $sock_dir = "/tmp/.xtcd";
mkpath($sock_dir);
my $display = shift;
my $node    = shift;
my $title   = shift;
my $quit    = 0;

my $sock_path = "$sock_dir/$display.$node";

$SIG{CHLD} = sub { while (waitpid(-1, WNOHANG) > 0) { } };
$SIG{HUP} = $SIG{TERM} = $SIG{INT} = sub { $quit++ };

unlink($sock_path);
umask(0111);

my $listen;

$listen = IO::Socket::UNIX->new(
    Local  => $sock_path,
    Listen => SOMAXCONN
);
unless ($listen) {
    print("xtcd: $display.$node cannot create a listening socket: $@");
    die "cannot create a listening socket $sock_path: $@";
}

while (!$quit) {
    my $connected = $listen->accept();
    my $child     = launch_child();

    if (!defined $child) {
        print("xtcd: $display.$node cannot fork, exiting");
        die "cannot fork";
    }

    if ($child) {
        close $connected;
    }
    else {
        close $listen;
        interact($connected);
        exit 0;
    }
}

unlink($sock_path);
exit(0);

sub launch_child {
    my $signals = POSIX::SigSet->new(SIGINT, SIGCHLD, SIGTERM, SIGHUP);
    sigprocmask(SIG_BLOCK, $signals);
    my $child = fork();
    unless ($child) {
        $SIG{$_} = 'DEFAULT' foreach qw(HUP INT TERM CHLD);
    }
    sigprocmask(SIG_UNBLOCK, $signals);
    return $child;
}

sub interact {
    my $c = shift;
    my $command;

    my $commandstring = <$c>;
    chomp($commandstring);

    foreach (split(/ /, $commandstring)) {
        $command = $_;

        if ($command eq "ping") {

            #			print $c "ok ping\n";
        }
        elsif ($command =~ /move=/) {
            $command =~ s/move=//;
            my ($x, $y) = split(/x/, $command);
            print "\033[3;${x};${y}t";

            #			print $c "ok move\n";
        }
        elsif ($command =~ /font=/) {
            $command =~ s/font=//;
            print "\033]50;${command}\007";

            #			print $c "ok font\n";
        }
        elsif ($command eq "raise") {
            print "\033[5t";

            #			print $c "ok raise\n";
        }
        elsif ($command eq "lower") {
            print "\033[6t";

            #			print $c "ok lower\n";
        }
        elsif ($command eq "refresh") {
            print "\033[7t";

            #			print $c "ok refresh\n";
        }
        elsif ($command eq "iconify") {
            print "\033[2t";

            #			print $c "ok iconify\n";
        }
        elsif ($command eq "restore") {
            print "\033[1t";

            #			print $c "ok restore\n";
        }
        elsif ($command eq "title") {
            print "\033]2;${title}\007";

            #			print $c "ok title\n";
        }
        elsif ($command =~ /title=/) {
            $command =~ s/title=//;
            print "\033]2;${command}\007";

            #			print $c "ok title\n";
        }
    }

    close $c;
}