#!/usr/bin/perl -w
#
use English;
use Chemistry::Elements qw(get_name get_Z get_symbol);
use Tk;
use Tk::DialogBox;
use strict;
sub convert ;

my $MW = MainWindow->new;

### --- Prevents Main Window Resizing
$MW->bind('<Configure>' => sub{
        my $xe = $MW->XEvent;
        $MW->maxsize($xe->w, $xe->h);
        $MW->minsize($xe->w, $xe->h);
});


### --- Main Window Title
$MW->title("The Elements");

### --- Create Button Frame
my $button_frame = $MW->Frame();
        $button_frame->pack(-side => 'bottom', -expand => '1', -fill => 'both');

### --- Create About Button
$button_frame->Button(-text => "About",
	    -foreground => "#007300",
	    -activebackground => "#98FB98",
            -font => 'Arial',
	    -command => sub
	     { 
		my $dialogA = $MW->DialogBox( -title   => "About this program",
                                              -buttons => [ "OK" ],
                                );

    		$dialogA->add("Label",
				
				-borderwidth => '3',
				-background => "#FAEBD7", #ANTIQUE WHITE
                                -font => 'bold',
			        -justify => 'left',
				-relief => 'sunken', #One seriously long text string follows on the next line -->
                                -text => "FOR BEST RESULTS USE: PERL 5.6.1 \& Tk 8.0 OR BETTER\nThis program requires use of the perl module Chemistry::Elements.\nVersion 1.0    -- 03\/06\/2001 Original Code Written by Jay Madigan.\nVersion 1.1    -- 03\/09\/2001 Cleaned up \& Commented code, implemented use strict;.\nVersion 1.2    -- 03\/10\/2001 Added code to prevent Main Window & Dialog Box resizing\r\t       - resized (enlarged) About dialog box font for better readability.\nVersion 1.3    -- 05\/26\/2001 Added Error Message Dialog Box for invalid entries.\nVersion 1.4    -- 08\/19\/2001 Changed all widget fonts to Arial.\nVersion 1.4.1 -- 12\/04\/2001 Minor text formatting changes in About Box.\nVersion 1.5    -- 02\/16\/2001 Changed Main Window Title to \"The Elements\".\n************************************************************************************************\nThis program is freeware and may be modified and\/or redistributed \nunder the same terms as the GNU public license of PERL. \nNo warranty on this code is assumed or implied. ")->pack;

### --- Prevents Dialog Box Resizing
$dialogA->bind('<Configure>' => sub{
        my $xeD = $dialogA->XEvent;
        $dialogA->maxsize($xeD->w, $xeD->h);
        $dialogA->minsize($xeD->w, $xeD->h);
});



    		$dialogA->Show;
}
)->pack(-side => 'right', -expand => '1', -fill => 'both');

### --- Create Exit Button
my $exit = $button_frame->Button(-text => 'Exit',
		       -foreground => 'red',	
		       -activebackground => "#FF9090",
                       -font => 'Arial',
                       -command => sub
			{
			 exit;
			});
$exit->pack(-side => 'right', -expand => '1', -fill => 'both');

### --- Create Convert Button
my $convert = $button_frame->Button(-text => 'Find',
                                    -foreground => "blue",
                                    -activebackground => "#ADD8E6", 
                                    -font => 'Arial',
                                    -command => sub
                                                   {
                                                        convert;
                                                        });
$convert->pack(-side => 'right', -expand => '1', -fill => 'both');

### --- Create Element Atomic Number Frame
my $number_frame = $MW->Frame()->pack(-expand => '1', -fill => 'both', -side
=> 'bottom');

$number_frame->Label(-text => "Atomic number:", -font => 'Arial')->pack(-side => 'left');
my $number_value = $number_frame->Entry(-font => 'Arial', -width => '3', -relief => 'sunken')->pack(-side => 'left');
#
#
### --- Create Element Name Frame
my $name_frame = $MW->Frame()->pack(-expand => '1', -fill => 'both', -side
=> 'bottom');

$name_frame->Label(-text => "Element name:", -font => 'Arial')->pack(-side => 'left');
my $name_value = $name_frame->Entry(-font => 'Arial', -width => '12', -relief => 'sunken')->pack(-side => 'right');
#
#
### --- Create Entry Frame
my $entry_frame = $MW->Frame()->pack(-expand => '1', -fill => 'both', -side =>
'bottom');

$entry_frame->Label(-foreground => 'red', -font => 'Arial', -text => "Enter element symbol:")->pack(-side => 'left');
my $convert_value = $entry_frame->Entry(-highlightbackground => 'red',-highlightthickness => '1', -font => 'Arial', -width => '3', -relief => 'sunken')->pack(-side => 'left');


MainLoop;

#### BEGIN SECTION FOR SUBROUTINES ----

sub convert {
    my $question = $convert_value->get;
    my $name = get_name($question);
    my $number = get_Z($question);
    print "$name\n";
## generate "sqwauk box" if invalid entry was made
## resulting in null output
if(!(defined $name)){
    my $dialogW = $MW->DialogBox( -title   => "ERROR! Please Try Again.",
				 -buttons => [ "OK" ],
				);
    $dialogW->add("Label", -text => "     \"$question\" is not a valid entry.     ",
		          -font => "Arial",
			  -foreground => "red")->pack;

### --- Prevents Dialog Box Resizing
$dialogW->bind('<Configure>' => sub{
        my $xeW = $dialogW->XEvent;
        $dialogW->maxsize($xeW->w, $xeW->h);
        $dialogW->minsize($xeW->w, $xeW->h);
});

    $dialogW->Show;
}
    $number_value->delete('0', 'end');
    $number_value->insert('0', $number);
    $name_value->delete('0', 'end');
    $name_value->insert('0', $name);
    
}