#!perl

use Data::Dumper;

system("pwd");

$RESULT = "t/config";
my %REQUIRED = 
  (keyname => ["Name of shared secret", "omkey"],
   keytype => ["Shared secret type", "hmac-md5"],
   key => "Shared secret",
   host => "Main server host",
   'lease-addr-range' => "Range of addresses on which leases are sought",
   'failover-name' => "Name of failover system",
   'failover-hosts' => ["List of hosts on which to try failover testing",
			[] ],
  );

my $OLD_OK = -e($RESULT) && do $RESULT;
#my $res = do $RESULT;
#{ my $r = defined($res) ? "<$res>" : "UNDEF";
#  warn "do '$RESULT' => $r ($@)\n";
#}
#$OLD_OK &&= $res;
if ($OLD_OK) { warn "Found old configuration file; loaded it.\n" }
for my $k (keys %REQUIRED) {
    next if $OLD_OK && defined $dhcpCONFIG{$k};
    print "This is the configurator for the test suite.
If you don't know what something is, type '?'.
To take the default, type ENTER.
\n" if $CHANGED++ == 0;
    ask_about($k);
}

write_data() if $CHANGED;
print "Hit ENTER to continue, or anything else to manually edit
the configuration file.\n";
chomp(my $resp = <STDIN>) ;
exit 0 if $resp eq "";
my $editor = $ENV{VISUAL} || $ENV{EDITOR} || "/bin/ed";
system($editor, $RESULT);

sub ask_about {
    my $k = shift;
    my $v = $REQUIRED{$k};
    my ($explain, $default);
    if (ref $v) {
	($explain, $default) = @$v;
    } else {
	$explain = $v;
    }
  prompt: {
	my $prompt = defined($default) ? "$k [$default]> " : "$k> ";
	print $prompt;
	chomp(my $resp = <STDIN>);
	$resp =~ s/^\s+//;
	$resp =~ s/\s+$//;

	if ($resp eq "?") {
	    print $explain, "\n";
	    redo prompt;
	} elsif ($resp eq "") {
	    if (defined $default) {
		$dhcpCONFIG{$k} = $default;
	    }  else { 
		redo prompt;
	    }
	} else {
	    $dhcpCONFIG{$k} = $resp;
	}
    }
}

sub write_data {
    open R, ">", $RESULT 
      or die "Couldn't open config file '$RESULT' for writing: $!; aborting";
    print R Data::Dumper->Dump([\%dhcpCONFIG], ["*dhcpCONFIG"]);
    close R or die "Couldn't finish writing '$RESULT': $!; aborting";
}