package PDF::API2::Resource::BaseFont;

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

use strict;
use warnings;

our $VERSION = '2.035'; # VERSION

use Compress::Zlib;
use Encode qw(:all);
use PDF::API2::Basic::PDF::Utils;
use PDF::API2::Util;
use Scalar::Util qw(weaken);

=head1 NAME

PDF::API2::Resource::BaseFont - Base class for font resources

=head1 METHODS

=over

=item $font = PDF::API2::Resource::BaseFont->new($pdf, $name)

Return a font resource object.

=cut

sub new {
    my ($class, $pdf, $name) = @_;
    my $self;

    $class = ref($class) if ref($class);
    $self  = $class->SUPER::new($pdf, $name);

    $pdf->new_obj($self) unless $self->is_obj($pdf);

    $self->{'Type'} = PDFName('Font');

    $self->{' apipdf'} = $pdf;
    weaken $self->{' apipdf'};
    return $self;
}

sub data { return $_[0]->{' data'}; }

=item $descriptor = $font->descrByData()

Return the font's FontDescriptor key structure based on the font's data.

=cut

sub descrByData {
    my $self = shift();

    my $descriptor = PDFDict();
    $self->{' apipdf'}->new_obj($descriptor);

    $descriptor->{'Type'}     = PDFName('FontDescriptor');
    $descriptor->{'FontName'} = PDFName($self->fontname());

    my @box = map { PDFNum($_ || 0) } $self->fontbbox();
    $descriptor->{'FontBBox'} = PDFArray(@box);

    $descriptor->{'Ascent'}       = PDFNum($self->ascender()     || 0);
    $descriptor->{'Descent'}      = PDFNum($self->descender()    || 0);
    $descriptor->{'ItalicAngle'}  = PDFNum($self->italicangle()  || 0.0);
    $descriptor->{'XHeight'}      = PDFNum($self->xheight()      || (($self->fontbbox())[3] * 0.5) || 500);
    $descriptor->{'CapHeight'}    = PDFNum($self->capheight()    || ($self->fontbbox())[3] || 800);
    $descriptor->{'StemV'}        = PDFNum($self->stemv()        || 0);
    $descriptor->{'StemH'}        = PDFNum($self->stemh()        || 0);
    $descriptor->{'AvgWidth'}     = PDFNum($self->avgwidth()     || 300);
    $descriptor->{'MissingWidth'} = PDFNum($self->missingwidth() || 300);
    $descriptor->{'MaxWidth'}     = PDFNum($self->maxwidth()     || $self->missingwidth() || ($self->fontbbox())[2]);
    $descriptor->{'Flags'}        = PDFNum($self->flags()        || 0) unless $self->data->{'iscore'};
    if (defined $self->data->{'panose'}) {
        $descriptor->{'Style'} = PDFDict();
        $descriptor->{'Style'}->{'Panose'} = PDFStrHex($self->data->{'panose'});
    }
    $descriptor->{'FontFamily'}  = PDFStr($self->data->{'fontfamily'})   if defined $self->data->{'fontfamily'};
    $descriptor->{'FontWeight'}  = PDFNum($self->data->{'fontweight'})   if defined $self->data->{'fontweight'};
    $descriptor->{'FontStretch'} = PDFName($self->data->{'fontstretch'}) if defined $self->data->{'fontstretch'};

    return $descriptor;
}

sub tounicodemap {
    my $self = shift();

    return $self if defined $self->{'ToUnicode'};

    my $stream = qq|\%\% Custom\n\%\% CMap\n\%\%\n/CIDInit /ProcSet findresource begin\n|;
    $stream .= qq|12 dict begin begincmap\n|;
    $stream .= qq|/CIDSystemInfo <<\n|;
    $stream .= sprintf(qq|   /Registry (%s)\n|, $self->name());
    $stream .= qq|   /Ordering (XYZ)\n|;
    $stream .= qq|   /Supplement 0\n|;
    $stream .= qq|>> def\n|;
    $stream .= sprintf(qq|/CMapName /pdfapi2-%s+0 def\n|, $self->name());
    if ($self->can('uniByCId') and $self->can('glyphNum')) {
        # this is a type0 font
        $stream .= sprintf(qq|1 begincodespacerange <0000> <%04X> endcodespacerange\n|, $self->glyphNum() - 1);
        for (my $j = 0; $j < $self->glyphNum(); $j++) {
            my $i = $self->glyphNum() - $j > 100 ? 100 : $self->glyphNum() - $j;
            if ($j == 0) {
                $stream .= qq|$i beginbfrange\n|;
            }
            elsif ($j % 100 == 0) {
                $stream .= qq|endbfrange\n|;
                $stream .= qq|$i beginbfrange\n|;
            }
            $stream .= sprintf(qq|<%04x> <%04x> <%04x>\n|, $j, $j, $self->uniByCId($j));
        }
        $stream .= "endbfrange\n";
    }
    else {
        # everything else is a single byte font
        $stream .= qq|1 begincodespacerange\n<00> <FF>\nendcodespacerange\n|;
        $stream .= qq|256 beginbfchar\n|;
        for (my $j = 0; $j < 256; $j++) {
            $stream .= sprintf(qq|<%02X> <%04X>\n|, $j, $self->uniByEnc($j));
        }
        $stream .= qq|endbfchar\n|;
    }
    $stream .= qq|endcmap CMapName currendict /CMap defineresource pop end end\n|;

    my $cmap = PDFDict();
    $cmap->{'Type'}                          = PDFName('CMap');
    $cmap->{'CMapName'}                      = PDFName(sprintf(qq|pdfapi2-%s+0|, $self->name()));
    $cmap->{'CIDSystemInfo'}                 = PDFDict();
    $cmap->{'CIDSystemInfo'}->{'Registry'}   = PDFStr($self->name());
    $cmap->{'CIDSystemInfo'}->{'Ordering'}   = PDFStr('XYZ');
    $cmap->{'CIDSystemInfo'}->{'Supplement'} = PDFNum(0);

    $self->{' apipdf'}->new_obj($cmap);
    $cmap->{' nofilt'}   = 1;
    $cmap->{' stream'}   = Compress::Zlib::compress($stream);
    $cmap->{'Filter'}    = PDFArray(PDFName('FlateDecode'));
    $self->{'ToUnicode'} = $cmap;

    return $self;
}

=back

=head1 FONT-MANAGEMENT RELATED METHODS

=over

=item $name = $font->fontname()

Return the font's name (a.k.a. display name).

=cut

sub fontname { return $_[0]->data->{'fontname'}; }

=item $name = $font->altname()

Return the font's alternative name (a.k.a. Windows name for a postscript font).

=cut

sub altname { return $_[0]->data->{'altname'}; }

=item $name = $font->subname()

Return the font's subname (a.k.a. font variant, schriftschnitt).

=cut

sub subname { return $_[0]->data->{'subname'}; }

=item $name = $font->apiname()

Return the font's name to be used internally (should be equal to $font->name()).

=cut

sub apiname { return $_[0]->data->{'apiname'}; }

=item $issymbol = $font->issymbol()

Return the font's symbol flag.

=cut

sub issymbol { return $_[0]->data->{'issymbol'}; }

=item $iscff = $font->iscff()

Return the font's Compact Font Format flag.

=cut

sub iscff { return $_[0]->data->{'iscff'}; }

=back

=head1 TYPOGRAPHY RELATED METHODS

=over

=item ($llx, $lly, $urx, $ury) = $font->fontbbox()

Return the font's bounding box.

=cut

sub fontbbox { return @{$_[0]->data->{'fontbbox'}}; }

=item $capheight = $font->capheight()

Return the font's capheight value.

=cut

sub capheight { return $_[0]->data->{'capheight'}; }

=item $xheight = $font->xheight()

Return the font's xheight value.

=cut

sub xheight { return $_[0]->data->{'xheight'}; }

=item $missingwidth = $font->missingwidth()

Return the font's missingwidth value.

=cut

sub missingwidth { return $_[0]->data->{'missingwidth'}; }

=item $maxwidth = $font->maxwidth()

Return the font's maxwidth value.

=cut

sub maxwidth { return $_[0]->data->{'maxwidth'}; }

=item $avgwidth = $font->avgwidth()

Return the font's avgwidth value.

=cut

sub avgwidth {
    my $self = shift();
    my $aw = $self->data->{'avgwidth'};
    $aw ||= ((
        $self->wxByGlyph('a') *  64 +
        $self->wxByGlyph('b') *  14 +
        $self->wxByGlyph('c') *  27 +
        $self->wxByGlyph('d') *  35 +
        $self->wxByGlyph('e') * 100 +
        $self->wxByGlyph('f') *  20 +
        $self->wxByGlyph('g') *  14 +
        $self->wxByGlyph('h') *  42 +
        $self->wxByGlyph('i') *  63 +
        $self->wxByGlyph('j') *   3 +
        $self->wxByGlyph('k') *   6 +
        $self->wxByGlyph('l') *  35 +
        $self->wxByGlyph('m') *  20 +
        $self->wxByGlyph('n') *  56 +
        $self->wxByGlyph('o') *  56 +
        $self->wxByGlyph('p') *  17 +
        $self->wxByGlyph('q') *   4 +
        $self->wxByGlyph('r') *  49 +
        $self->wxByGlyph('s') *  56 +
        $self->wxByGlyph('t') *  71 +
        $self->wxByGlyph('u') *  31 +
        $self->wxByGlyph('v') *  10 +
        $self->wxByGlyph('w') *  18 +
        $self->wxByGlyph('x') *   3 +
        $self->wxByGlyph('y') *  18 +
        $self->wxByGlyph('z') *   2 +
        $self->wxByGlyph('A') *  64 +
        $self->wxByGlyph('B') *  14 +
        $self->wxByGlyph('C') *  27 +
        $self->wxByGlyph('D') *  35 +
        $self->wxByGlyph('E') * 100 +
        $self->wxByGlyph('F') *  20 +
        $self->wxByGlyph('G') *  14 +
        $self->wxByGlyph('H') *  42 +
        $self->wxByGlyph('I') *  63 +
        $self->wxByGlyph('J') *   3 +
        $self->wxByGlyph('K') *   6 +
        $self->wxByGlyph('L') *  35 +
        $self->wxByGlyph('M') *  20 +
        $self->wxByGlyph('N') *  56 +
        $self->wxByGlyph('O') *  56 +
        $self->wxByGlyph('P') *  17 +
        $self->wxByGlyph('Q') *   4 +
        $self->wxByGlyph('R') *  49 +
        $self->wxByGlyph('S') *  56 +
        $self->wxByGlyph('T') *  71 +
        $self->wxByGlyph('U') *  31 +
        $self->wxByGlyph('V') *  10 +
        $self->wxByGlyph('W') *  18 +
        $self->wxByGlyph('X') *   3 +
        $self->wxByGlyph('Y') *  18 +
        $self->wxByGlyph('Z') *   2 +
        $self->wxByGlyph('space') * 332
    ) / 2000);
    return int($aw);
}

=item $flags = $font->flags()

Return the font's flags value.

=cut

sub flags { return $_[0]->data->{'flags'}; }

=item $stemv = $font->stemv()

Return the font's stemv value.

=cut

sub stemv { return $_[0]->data->{'stemv'}; }

=item $stemh = $font->stemh()

Return the font's stemh value.

=cut

sub stemh { return $_[0]->data->{'stemh'}; }

=item $italicangle = $font->italicangle()

Return the font's italicangle value.

=cut

sub italicangle { return $_[0]->data->{'italicangle'}; }

=item $isfixedpitch = $font->isfixedpitch()

Return the font's isfixedpitch flag.

=cut

sub isfixedpitch { return $_[0]->data->{'isfixedpitch'}; }

=item $underlineposition = $font->underlineposition()

Return the font's underlineposition value.

=cut

sub underlineposition { return $_[0]->data->{'underlineposition'}; }

=item $underlinethickness = $font->underlinethickness()

Return the font's underlinethickness value.

=cut

sub underlinethickness { return $_[0]->data->{'underlinethickness'}; }

=item $ascender = $font->ascender()

Return the font's ascender value.

=cut

sub ascender { return $_[0]->data->{'ascender'}; }

=item $descender = $font->descender()

Return the font's descender value.

=cut

sub descender { return $_[0]->data->{'descender'}; }

=back

=head1 GLYPH RELATED METHODS

=over 4

=item @names = $font->glyphNames()

Return the defined glyph names of the font.

=cut

sub glyphNames { return keys %{$_[0]->data->{'wx'}}; }

=item $glNum = $font->glyphNum()

Return the number of defined glyph names of the font.

=cut

sub glyphNum { return scalar keys %{$_[0]->data->{'wx'}}; }

=item $uni = $font->uniByGlyph($char)

Return the unicode by glyph name.

=cut

sub uniByGlyph { return $_[0]->data->{'n2u'}->{$_[1]}; }

=item $uni = $font->uniByEnc($char)

Return the unicode by the fonts encoding map.

=cut

sub uniByEnc { return $_[0]->data->{'e2u'}->[$_[1]]; }

=item $uni = $font->uniByMap($char)

Return the unicode by the font's default map.

=cut

sub uniByMap { return $_[0]->data->{'uni'}->[$_[1]]; }

=item $char = $font->encByGlyph($glyph)

Return the character by the given glyph name of the font's encoding map.

=cut

sub encByGlyph { return $_[0]->data->{'n2e'}->{$_[1]} || 0; }

=item $char = $font->encByUni($uni)

Return the character by the given unicode of the font's encoding map.

=cut

sub encByUni { return $_[0]->data->{'u2e'}->{$_[1]} || $_[0]->data->{'u2c'}->{$_[1]} || 0; }

=item $char = $font->mapByGlyph($glyph)

Return the character by the given glyph name of the font's default map.

=cut

sub mapByGlyph { return $_[0]->data->{'n2c'}->{$_[1]} || 0; }

=item $char = $font->mapByUni($uni)

Return the character by the given unicode of the fonts default map.

=cut

sub mapByUni { return $_[0]->data->{'u2c'}->{$_[1]} || 0; }

=item $name = $font->glyphByUni($uni)

Return the glyph's name by the font's unicode map.
B<BEWARE:> non-standard glyph-names are mapped onto
the ms-symbol area (0xF000).

=cut

sub glyphByUni { return $_[0]->data->{'u2n'}->{$_[1]} || '.notdef'; }

=item $name = $font->glyphByEnc($char)

Return the glyph's name by the font's encoding map.

=cut

sub glyphByEnc {
    my ($self, $e) = @_;
    my $g = $self->data->{'e2n'}->[$e];
    return $g;
}

=item $name = $font->glyphByMap($char)

Return the glyph's name by the font's default map.

=cut

sub glyphByMap { return $_[0]->data->{'char'}->[$_[1]]; }

=item $width = $font->wxByGlyph($glyph)

Return the glyph's width.

=cut

sub wxByGlyph {
    my $self  = shift();
    my $glyph = shift();
    my $width;
    if (ref($self->data->{'wx'}) eq 'HASH') {
        $width   = $self->data->{'wx'}->{$glyph};
        $width //= $self->missingwidth();
        $width //= 300;
    }
    else {
        my $cid = $self->cidByUni(uniByName($glyph));
        $width   = $self->data->{'wx'}->[$cid] if defined $cid;
        $width //= $self->missingwidth();
        $width //= 300;
    }
    return $width;
}

=item $width = $font->wxByUni($uni)

Return the unicode's width.

=cut

sub wxByUni {
    my $self  = shift();
    my $val   = shift();
    my $gid   = $self->glyphByUni($val);
    my $width;
    $width   = $self->data->{'wx'}->{$gid} if defined $gid;
    $width //= $self->missingwidth();
    $width //= 300;
    return $width;
}

=item $width = $font->wxByEnc($char)

Return the character's width based on the current encoding.

=cut

sub wxByEnc {
    my ($self, $e) = @_;
    my $glyph = $self->glyphByEnc($e);
    my $width;
    $width   = $self->data->{'wx'}->{$glyph} if defined $glyph;
    $width //= $self->missingwidth();
    $width //= 300;
    return $width;
}

=item $width = $font->wxByMap($char)

Return the character's width based on the font's default encoding.

=cut

sub wxByMap {
    my ($self, $map) = @_;
    my $glyph = $self->glyphByMap($map);
    my $width;
    $width = $self->data->{'wx'}->{$glyph} if defined $glyph;
    $width //= $self->missingwidth();
    $width //= 300;
    return $width;
}

=item $wd = $font->width($text)

Return the width of $text as if it were at size 1.

=cut

sub width {
    my ($self, $text) = @_;
    $text = $self->strByUtf($text) if utf8::is_utf8($text);

    my @cache;
    my $width      = 0;
    my $kern       = $self->{'-dokern'} && ref($self->data->{'kern'});
    my $last_glyph = '';
    foreach my $n (unpack('C*', $text)) {
        $cache[$n] //= $self->wxByEnc($n);
        $width += $cache[$n];
        if ($kern) {
            $width += ($self->data->{'kern'}->{$last_glyph . ':' . $self->data->{'e2n'}->[$n]} // 0);
            $last_glyph = $self->data->{'e2n'}->[$n];
        }
    }
    $width /= 1000;
    return $width;
}

=item @widths = $font->width_array($text)

Return the widths of the words in $text as if they were at size 1.

=cut

sub width_array {
    my ($self, $text) = @_;
    $text = $self->utfByStr($text) unless utf8::is_utf8($text);
    my @widths = map { $self->width($_) } split(/\s+/, $text);
    return @widths;
}

=back

=head1 STRING METHODS

=over

=item $utf8_string = $font->utfByStr($string)

Return the utf8-string from string based on the font's encoding map.

=cut

sub utfByStr {
    my ($self, $string) = @_;
    $string = pack('U*', map { $self->uniByEnc($_) } unpack('C*', $string));
    utf8::upgrade($string);
    return $string;
}

=item $string = $font->strByUtf($utf8_string)

Return the encoded string from utf8-string based on the font's encoding map.

=cut

sub strByUtf {
    my ($self, $string) = @_;
    $string = pack('C*', map { $self->encByUni($_) & 0xFF } unpack('U*', $string));
    utf8::downgrade($string);
    return $string;
}

=item $pdf_string = $font->textByStr($text)

Return a properly formatted representation of $text for use in the PDF.

=cut

sub textByStr {
    my ($self, $string) = @_;
    $string = $self->strByUtf($string) if utf8::is_utf8($string);

    my $text = $string;
    $text =~ s/\\/\\\\/go;
    $text =~ s/([\x00-\x1f])/sprintf('\%03lo', ord($1))/ge;
    $text =~ s/([\{\}\[\]\(\)])/\\$1/g;
    return $text;
}

sub textByStrKern {
    my ($self, $string) = @_;
    return '(' . $self->textByStr($string) . ')' unless $self->{'-dokern'} and ref($self->data->{'kern'});

    $string = $self->strByUtf($string) if utf8::is_utf8($string);

    my $text       = ' ';
    my $tBefore    = 0;
    my $last_glyph = '';
    foreach my $n (unpack('C*', $string)) {
        if (defined $self->data->{'kern'}->{$last_glyph . ':' . $self->data->{'e2n'}->[$n]}) {
            $text .= ') ' if $tBefore;
            $text .= sprintf('%i ', -($self->data->{'kern'}->{$last_glyph . ':' . $self->data->{'e2n'}->[$n]}));
            $tBefore = 0;
        }
        $last_glyph = $self->data->{'e2n'}->[$n];
        my $t = pack('C', $n);
        $t =~ s/\\/\\\\/g;
        $t =~ s/([\x00-\x1f])/sprintf('\%03lo', ord($1))/ge;
        $t =~ s/([\{\}\[\]\(\)])/\\$1/g;
        $text .= '(' unless $tBefore;
        $text .= "$t";
        $tBefore = 1;
    }
    $text .= ') ' if $tBefore;
    return $text;
}

# Maintainer's note: $size here is used solely as a flag to determine whether or
# not to append a text-showing operator (TJ or Tj).
sub text {
    my ($self, $string, $size, $indent) = @_;
    my $text = $self->textByStr($string);

    if (defined $size and $self->{'-dokern'}) {
        $text = $self->textByStrKern($string);
        return "[ $indent $text ] TJ" if $indent;
        return "[ $text ] TJ";
    }
    elsif (defined $size) {
        return "[ $indent ($text) ] TJ" if $indent;
        return "($text) Tj";
    }
    else {
        return "($text)";
    }
}

sub isvirtual { return }

=back

=cut

1;
