#!c:\perl\bin\perl.exe -w

use Tk;
use Win32::OLE;

######################
# Begin user defaults
# (Stuff you can change)
######################

$loop_minutes = 2; # How many minutes between trips
$char_string = "\040\010"; # What char string to trip the shell with.
$exit_time_regex = "23:[0-9]{2}:[0-9]{2}"; # When to exit program.

######################
# End user defaults
# Begin GUS subs
######################

# Return Date Time Group in ISO 8601 approved fashion.
sub update_DTG {
    my ( $sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst ) =
        localtime(time);
    my $DTG =
        sprintf( "%04d-%02d-%02d %02d:%02d:%02d", $year + 1900, $mon + 1, $mday,
        $hour, $min, $sec );
    return ("$DTG");
}

# Send a character string to trip any screensaver.
sub trip_screensaver {
  $WshShell = new Win32::OLE 'WScript.Shell'  ||
  	die "No new shell object $! $?";
  $WshShell->SendKeys($char_string); }

######################
# End GUS subs
# Begin GUI stuff
######################

# First declare the main GUI frame and all her daughters.

my $mw = MainWindow->new( -title => ' Screensaver Delay' );

my $fm_top = $mw->Frame(
    -relief      => 'flat',
    -borderwidth => 5
);

# Make all the frames.
my $fm_btm = $mw->Frame(
    -relief      => 'flat',
    -borderwidth => 5
);

# Build the label and entry box widgets for the 'File path' frame.

$fm_top->Entry(
	-textvariable => \$last_trip,
    -background => "white",
    -foreground => 'blue',
    -relief     => 'sunken',
    -font       => 'courier' )->pack(
    -side       => 'left',
    -expand     => 1,
    -fill       => 'x'
);

$fm_btm->Button(
    -text             => ' Start ',
    -command          =>  \&start_tripping,
    -background       => 'gray',
    -activebackground => 'red',
    -relief           => 'raised',
    )->pack(
    -side   => 'left',
    -expand => 1,
    -fill   => 'x'
);

$fm_btm->Button(
    -text             => ' Pause ',
    -command          =>  \&stop_tripping,
    -background       => 'gray',
    -activebackground => 'blue',
    -relief           => 'raised',
    )->pack(
    -side   => 'left',
    -expand => 1,
    -fill   => 'x'
);

$fm_btm->Button(
    -text             => ' Exit ',
    -command          => \&exit,
    -background       => 'gray',
    -activebackground => 'green',
    -relief           => 'raised',
    )->pack(
    -side   => 'left',
    -expand => 1,
    -fill   => 'x'
);

# Pack all the frames last.

$fm_top->pack(
    -side   => 'top',
    -expand => 1,
    -fill   => 'x'
);

$fm_btm->pack(
    -side   => 'top',
    -expand => 1,
    -fill   => 'x'
);

$trip_flag = 0;

sub start_tripping {
	$last_trip = "SS Delay Engaged.";
	$trip_flag = 1;
}
sub stop_tripping {
	$last_trip = "SS Delay Paused.";
	$trip_flag = 0;
}

$mw->repeat( $loop_minutes * 60 * 1000, \&ss_trip );

sub ss_trip {
	exit if update_DTG =~ /$exit_time_regex/;
	if ( $trip_flag ) {
		trip_screensaver();
		$last_trip = update_DTG();
	}
}

MainLoop;