#!/usr/bin/perl

# Written by Jessica Hamrick, (C) 2010

use strict;
use warnings;
use Getopt::Long;

my $usage = 
    "Usage: gutenbach-client-config [-l|--list|-a|--add|-d|--delete] [QUEUE] [--host=HOST]\n" .
    "\n" .
    "\t-l, --list\t\tList available queues\n" .
    "\t-a, --add QUEUE\t\tAdd a queue (must be used with -h)\n" .
    "\t-d, --delete QUEUE\tDelete a queue)\n" .
    "\t-h, --host HOST\t\tHostname for the queue\n";

my $list = 0;
my $add = "";
my $delete = "";
my $host = "";

GetOptions ('l|list' => \$list,
            'a|add=s' => \$add,
            'd|delete=s' => \$delete,
	    'h|host=s' => \$host);

my $configpath = "$ENV{'HOME'}/.gutenbach";

if (! -e $configpath) {
    mkdir "$configpath";
}

# list the existing queues
if ($list and !$add and !$delete) {
    my @queues = glob("$configpath/*") or die "Couldn't find configuration files at '$configpath'";

    print "Queue\t\tHost\n";
    foreach my $q (@queues) {
	my ($host, $queue);

	if (-r $q) {
	    local $/;
	    my $fh;
	    open $fh, $q;
	    eval <$fh>;
	}

	print "$queue\t\t$host\n";
    }
}

# add a new queue
elsif (!$list and $add and !$delete) {
    if (!$host) {
	print $usage;
	exit 1;
    }

    if (-e "$configpath/$add") {
	print "Warning: queue '$add' already exists\n";
    }

    open CONFIG, "> $configpath/$add" or die "Couldn't open config file '$configpath/$add'";
    print CONFIG "\$host = \"$host\";\n";
    print CONFIG "\$queue = \"$add\";\n";
    close CONFIG;

    print "Added queue '$add' on host '$host'\n"
}

# delete an existing queue
elsif (!$list and !$add and $delete) {
    if (! -e "$configpath/$delete") {
	print "Error: queue '$delete' already exists\n";
	exit 1;
    }

    unlink("$configpath/$delete") or die "Couldn't remove config file '$configpath/$delete'";
}

else {
    print $usage;
    exit 1;
}