#!/usr/bin/perl

use strict;
use warnings;

our $VERSION = '3.025'; # VERSION
our $LAST_UPDATE = '3.016'; # manually update whenever code is changed

use PDF::Builder::Basic::PDF::File;
use PDF::Builder::Basic::PDF::Utils;
use PDF::Builder;
use Compress::Zlib;
use Scalar::Util qw(blessed);

sub walk_obj {
    my ($objs, $spdf, $tpdf, $obj, @keys) = @_;

    my $tobj;

    if(ref($obj) =~ /Objind$/) {
        $obj->realise();
    }

    return ($objs->{scalar $obj}) if defined $objs->{scalar $obj};

  die "object already copied" if $obj->{' copied'};

    $tobj=$obj->copy($spdf);
    $obj->{' copied'} = 1;
    $tpdf->new_obj($tobj) if $obj->is_obj($spdf) && !$tobj->is_obj($tpdf);

  $objs->{scalar $obj}=$tobj;

    if      (ref($obj) =~ /Array$/ || 
             (blessed($obj) && $obj->isa('PDF::Builder::Basic::PDF::Array'))) {
        $tobj->{' val'}=[];
        foreach my $k ($obj->elements()) {
            $k->realise if ref($k) =~ /Objind$/;
            $tobj->add_elements(walk_obj($objs, $spdf, $tpdf, $k));
        }
    } elsif (ref($obj) =~ /Dict$/ || 
	     (blessed($obj) && $obj->isa('PDF::Builder::Basic::PDF::Dict'))) {
        @keys = keys(%{$tobj}) if scalar @keys <1;
        foreach my $k (@keys) {
            next if $k=~/^ /;
            next unless defined($obj->{$k});
            $tobj->{$k}  =walk_obj($objs, $spdf, $tpdf, $obj->{$k});
        }
        if ($obj->{' stream'}) {
            if ($tobj->{Filter} && !$tobj->{DecodeParms}) {
                my $f = $tobj->{'Filter'};
                $f = PDFArray($f) unless ref($f )=~ /Array/;
                if (scalar($f->elements()) == 1) {
                    my ($t) = $f->elements();
                    if ($t->val() eq 'FlateDecode') {
                        $tobj->{' stream'} = uncompress($obj->{' stream'});
                        delete $tobj->{'Filter'};
                        $tobj->{'Length'} = PDFNum(length($tobj->{' stream'}));
                    } else {
                        $tobj->{' stream'} = $obj->{' stream'};
                    }
                } else {
                    $tobj->{' stream'} = $obj->{' stream'};
                }
                $tobj->{' nofilt'} = 1;
            } else {
                $tobj->{' stream'} = $obj->{' stream'};
            }
        }
    }
    delete $tobj->{' streamloc'};
    delete $tobj->{' streamsrc'};
    return($tobj);
}

if(scalar @ARGV<2) {
    print "usage: $0 infile outfile\n";
    exit(1);
}

my $spdf = PDF::Builder::Basic::PDF::File->open($ARGV[0]);
my $tpdf = PDF::Builder::Basic::PDF::File->_new();
my $mycache = {};
$tpdf->{'Root'} = walk_obj($mycache, $spdf, $tpdf, $spdf->{'Root'});
$tpdf->{'Info'} = walk_obj($mycache, $spdf, $tpdf, $spdf->{'Info'}) if $spdf->{'Info'};

$tpdf->out_file($ARGV[1]);