#!/usr/bin/perl

# this is just a very basic hack...

use Gimp::Feature qw(perl-5.005 gtk-1.2);
use Gimp (':consts','__','N_');
use Gimp::Fu;
use Gnome;
#use Gtk 0.61231;
use Gtk;
use Gtk::Gdk;
use Gimp::UI (); # for the logo

$VERSION = 0.0;

$tabw = 30;
$tabh = 12;

#Gimp::set_trace(TRACE_ALL);

@stringtargets = (
	{ target => "STRING",     flags => 0, info => TARGET_STRING },
	{ target => "text/plain", flags => 0, info => TARGET_STRING },
);

@funcframetarget = (
	{ target => "application/funcframe", flags => 0, info => TARGET_STRING },
);

%typetargets = (
  &PF_IMAGE  => [{ target => "application/image-link", flags => 0, info => 0 }],
  &PF_INT32  => [{ target => "application/value-link", flags => 0, info => 0 }],
  &PF_STRING => [{ target => "application/value-link", flags => 0, info => 0 }],
);

my $ex;		# average font width for default font
my $ey;		# average font height for default font

my $window;	# the main window
my $canvas;	# the gtklayout widget
my $funclist;

my %type2str = (
   &PDB_BOUNDARY    => 'BOUNDARY',
   &PDB_CHANNEL     => 'CHANNEL',
   &PDB_COLOR       => 'COLOR',
   &PDB_DISPLAY     => 'DISPLAY',
   &PDB_DRAWABLE    => 'DRAWABLE',
   &PDB_FLOAT       => 'FLOAT',
   &PDB_IMAGE       => 'IMAGE',
   &PDB_INT32       => 'INT32',
   &PDB_FLOATARRAY  => 'FLOATARRAY',
   &PDB_INT16       => 'INT16',
   &PDB_PARASITE    => 'PARASITE',
   &PDB_STRING      => 'STRING',
   &PDB_PATH        => 'PATH',
   &PDB_INT16ARRAY  => 'INT16ARRAY',
   &PDB_INT8        => 'INT8',
   &PDB_INT8ARRAY   => 'INT8ARRAY',
   &PDB_LAYER       => 'LAYER',
   &PDB_REGION      => 'REGION',
   &PDB_STRINGARRAY => 'STRINGARRAY',
   &PDB_SELECTION   => 'SELECTION',
   &PDB_STATUS      => 'STATUS',
   &PDB_INT32ARRAY  => 'INT32ARRAY',
);

sub add_func($$;) {
   my($group,$func)=@_;
   $funclist->append($func);
}

sub create_main {
   my $t = new Gtk::Tooltips;
   my $w = new Gtk::Window;

   my $v = new Gtk::VBox 0,5;
   my $h = new Gtk::HBox 0,5;

   $canvas = new ProgShell;

   $funclist = new Gtk::CList 1;
   $funclist->set_usize(200,0);
   $funclist->drag_source_set ([-button1_mask, -button3_mask], [-copy, -move], @::stringtargets);

   $funclist->signal_connect ("drag_data_get", sub {
      my ($widget, $context, $data, $info, $time) = @_;
      $data->set ($data->target, 8, $widget->get_text($widget->selection,0));
   });

   $funclist->set_selection_mode(-extended);

   $w->add ($h);
   $h->add ($v);

   my $sc = new Gtk::ScrolledWindow;
   $sc->add ($funclist);
   $v->add ($sc);
   $h->add ($canvas);

   for (sort Gimp->procedural_db_query("","","","","","","")) {
      $group = "gimp";
      $group = "image"    if /^gimp_image_/;
      $group = "layer"    if /^gimp_layer_/;
      $group = "channel"  if /^gimp_channel_/;
      $group = "drawable" if /^gimp_drawable_/;
      add_func $group, $_;
      $gimpfunc{$_} = 1;
   }
   $window = $w;
   $w->realize;
   $ex = $w->style->font->string_width ('Mn')*0.5;
   $ey = $w->style->font->string_width ('My');

   $w->set_title(__"Visual Scriptor");
   $w->signal_connect("destroy",sub {main_quit Gtk});

   show_all $w;
}

register "extension_visual_scriptor",
         "Visual Gimp Scripting Environment",
         "=pod(DESCRIPTION)",
         "Marc Lehmann",
         "Marc Lehmann",
         $VERSION,
         N_"<Toolbox>/Xtns/Visual Scriptor...",
         "",
         [],
         sub {

   Gimp::gtk_init;

   create_main;
   main Gtk;

   ();
};

# the basic function/node-type
package Func;

use Gimp;

sub new_from_gimp_func {
   my $name = shift;
   my $self = {};
   my ($narg, $nval);
   (
      $self->{blurb},
      $self->{help},
      $self->{author},
      $self->{copyright},
      $self->{date},
      $self->{proc_type},
      $narg,
      $nval,
   ) = Gimp->procedural_db_proc_info($name);
   $self->{in } = [map Gimp->procedural_db_proc_arg($name,$_), 0..$narg-1];
   $self->{out} = [map Gimp->procedural_db_proc_val($name,$_), 0..$nval-1];
   $self;
}

sub new_from_name {
   my $class = shift;
   my $name = shift;
   $new{$name} = new_from_gimp_func($name) if !$new{$name} && $::gimpfunc{$name};
   $new{$name} ?
      bless {
         name => $name,
         %{$new{$name}},
      }, $class
   :
      ();
}

# a connection tab
package Tab;

use Gimp::basewidget Gtk::Button;

sub OPEN (){1}
sub CONN (){2}
sub BOUND(){3}

sub GTK_CLASS_INIT {
   my $class = shift;
   add_arg_type $class "state", "gint", 3, 1;
   add_arg_type $class "type" , "gint", 3, 2;
   add_arg_type $class "dir"  , "gint", 3, 3;
}

sub GTK_OBJECT_SET_ARG {
   my($self,$arg,$id,$value) = @_;
   print "SA $self,$arg,$id,$value\n";
   if ($id == 1) {
      $self->{state} = $value;
   } elsif ($id == 2) {
      $self->{type}  = $value;
      $self->drag_dest_set('all', ['copy'], $::typetargets{$value});
      $self->drag_source_set ([-button1_mask], [-copy], $::typetargets{$value});
   } elsif ($id == 3) {
      $self->{dir}   = $value;
   }
}

sub GTK_OBJECT_GET_ARG {
   my($self,$arg,$id) = @_;
   if ($id == 1) {
      $self->{state};
   } elsif ($id == 2) {
      $self->{type};
   } elsif ($id == 3) {
      $self->{dir};
   }
}

sub GTK_OBJECT_INIT {
   shift unless ref $self; # care for "old" Gtk modules
   $self->set_usize($::tabw, $::tabh);
}

sub new {
   my $class = shift;
   $class->SUPER::new(@_);
   #$class->SUPER::new(shadow => out, @_);
}

# a single function or "block", can only exist
# within a progshell
package FuncFrame;

use Gimp::basewidget Gtk::VBox;

sub GTK_OBJECT_INIT {
   my $self = shift;
   
   signal_connect $self draw => sub {
      print "re-drawing @_\n\n";
   };
   signal_connect $self realize => sub {
      print "realize @_\n\n";
   };

   $self->add ($self->{inbox } = new Gtk::HBox 1, $::tabw*0.6);
   $self->add ($self->{button} = new Gtk::Button);
   $self->add ($self->{outbox} = new Gtk::HBox 1, $::tabw*0.6);
    
   $self->{button}->add(
      $self->{label} = new Gtk::Label
   );
}

sub set_func {
   my($self,$func)=@_;
   $self->{func} = $func;
   $self->{inbox }->remove($_) for $self->{inbox }->children;
   $self->{outbox}->remove($_) for $self->{outbox}->children;
   my $w = 1;
   my $in  = $self->{func}->{in };
   my $out = $self->{func}->{out};
   for (@$in) {
      $self->{inbox }->add (new Tab type => $_->[0], dir => 0);
   }
   for (@$out) {
      $self->{outbox}->add (new Tab type => $_->[0], dir => 1);
   }
   $self->{label}->set($func->{name});
}

sub new_from_name {
   my $class = shift;
   my $func = Func->new_from_name (shift);
   if ($func) {
      my $self = $class->new(@_);
      $self->set_func($func);
      $self;
   } else {
      ();
   }
}

# the shell canvas
package ProgShell;

use Gimp::basewidget Gtk::Layout;

sub new {
   print "new for progshell ",ProgShell->_object_type,"\n";
   Gtk::Object::new("ProgShell");
}

sub GTK_CLASS_INIT { }
sub GTK_OBJECT_INIT {
   my $canvas = shift;
   print "X @_\n";

   $canvas->set_usize (600, 800);
   $canvas->set_hadjustment(0);
   $canvas->set_vadjustment(0);
   $canvas->set_app_paintable(1);

   $canvas->signal_connect (draw => sub {
         print "DRAW @_ : ",@{$_[1]},"\n";
   });

   $canvas->signal_connect (drag_data_received => sub {
      my ($widget, $context, $x, $y, $data, $info, $time) = @_;
      my $type = Gtk::Gdk::Atom->name($data->type);
      if (($type eq "STRING" || $type eq "text/plain") && $data->format == 8) {
         my $widget = FuncFrame->new_from_name($data->data);
         $widget->show_all;
         $canvas ->put($widget,$x,$y);
         #printf ("Received \"%s\" in trashcan at $x, $y\n", $data->data);
      } else {
         $context->finish (0, 0, $time);
      }
      $context->finish (1, 0, $time);
   });

   $canvas->drag_dest_set('all', ['copy'], @::stringtargets);
}

package main;

exit main;