package PDF::API2::Resource::ColorSpace::Separation;

use base 'PDF::API2::Resource::ColorSpace';

use strict;
no warnings qw[ deprecated recursion uninitialized ];

our $VERSION = '2.035'; # VERSION

use PDF::API2::Basic::PDF::Utils;
use PDF::API2::Util;
use Scalar::Util qw(weaken);

=head1 NAME

PDF::API2::Resource::ColorSpace::Separation - Support for color space separations

=head1 METHODS

=over

=item $cs = PDF::API2::Resource::ColorSpace::Separation->new $pdf, $key, %parameters

Returns a new colorspace object.

=cut

sub new {
    my ($class,$pdf,$key,@opts)=@_;
    my ($name,@clr)=@opts;

    $class = ref $class if ref $class;
    my $self=$class->SUPER::new($pdf,$key,@opts);
    $pdf->new_obj($self) unless($self->is_obj($pdf));
    $self->{' apipdf'}=$pdf;
    weaken $self->{' apipdf'};

    my $fct=PDFDict();

    my $csname='DeviceRGB';
    $clr[0]=lc($clr[0]);
    $self->color(@clr);
    if($clr[0]=~/^[a-z\#\!]+/) {
        # colorname or #! specifier
        # with rgb target colorspace
        # namecolor returns always a RGB
        my ($r,$g,$b)=namecolor($clr[0]);

        $fct->{FunctionType}=PDFNum(0);
        $fct->{Size}=PDFArray(PDFNum(2));
        $fct->{Range}=PDFArray(map {PDFNum($_)} ($r,1,$g,1,$b,1));
        $fct->{Domain}=PDFArray(PDFNum(0),PDFNum(1));
        $fct->{BitsPerSample}=PDFNum(8);
        $fct->{' stream'}="\xff\xff\xff\x00\x00\x00";
    } elsif($clr[0]=~/^[\%]+/) {
        # % specifier
        # with cmyk target colorspace
        my ($c,$m,$y,$k)=namecolor_cmyk($clr[0]);
        $csname='DeviceCMYK';

        $fct->{FunctionType}=PDFNum(0);
        $fct->{Size}=PDFArray(PDFNum(2));
        $fct->{Range}=PDFArray(map {PDFNum($_)} (0,$c,0,$m,0,$y,0,$k));
        $fct->{Domain}=PDFArray(PDFNum(0),PDFNum(1));
        $fct->{BitsPerSample}=PDFNum(8);
        $fct->{' stream'}="\x00\x00\x00\x00\xff\xff\xff\xff";
    } elsif(scalar @clr == 1) {
        # grey color spec.
        while($clr[0]>1) { $clr[0]/=255; }
        # adjusted for 8/16/32bit spec.
        my $g=$clr[0];
        $csname='DeviceGray';

        $fct->{FunctionType}=PDFNum(0);
        $fct->{Size}=PDFArray(PDFNum(2));
        $fct->{Range}=PDFArray(map {PDFNum($_)} (0,$g));
        $fct->{Domain}=PDFArray(PDFNum(0),PDFNum(1));
        $fct->{BitsPerSample}=PDFNum(8);
        $fct->{' stream'}="\xff\x00";
    } elsif(scalar @clr == 3) {
        # legacy rgb color-spec (0 <= x <= 1)
        my ($r,$g,$b)=@clr;

        $fct->{FunctionType}=PDFNum(0);
        $fct->{Size}=PDFArray(PDFNum(2));
        $fct->{Range}=PDFArray(map {PDFNum($_)} ($r,1,$g,1,$b,1));
        $fct->{Domain}=PDFArray(PDFNum(0),PDFNum(1));
        $fct->{BitsPerSample}=PDFNum(8);
        $fct->{' stream'}="\xff\xff\xff\x00\x00\x00";
    } elsif(scalar @clr == 4) {
        # legacy cmyk color-spec (0 <= x <= 1)
        my ($c,$m,$y,$k)=@clr;
        $csname='DeviceCMYK';

        $fct->{FunctionType}=PDFNum(0);
        $fct->{Size}=PDFArray(PDFNum(2));
        $fct->{Range}=PDFArray(map {PDFNum($_)} (0,$c,0,$m,0,$y,0,$k));
        $fct->{Domain}=PDFArray(PDFNum(0),PDFNum(1));
        $fct->{BitsPerSample}=PDFNum(8);
        $fct->{' stream'}="\x00\x00\x00\x00\xff\xff\xff\xff";
    } else {
        die 'invalid color specification.';
    }
    $self->type($csname);
    $pdf->new_obj($fct);
    $self->add_elements(PDFName('Separation'), PDFName($name), PDFName($csname), $fct);
    $self->tintname($name);
    return($self);
}

=item @color = $res->color

Returns the base-color of the Separation-Colorspace.

=cut

sub color {
    my $self=shift @_;
    if(scalar @_ >0 && defined($_[0])) {
        $self->{' color'}=[@_];
    }
    return(@{$self->{' color'}});
}

=item $tintname = $res->tintname $tintname

Returns the tint-name of the Separation-Colorspace.

=cut

sub tintname {
    my $self=shift @_;
    if(scalar @_ >0 && defined($_[0])) {
        $self->{' tintname'}=[@_];
    }
    return(@{$self->{' tintname'}});
}


sub param {
    my $self=shift @_;
    return($_[0]);
}

=back

=cut

1;
