package C4::Barcodes::EAN13;

# Copyright 2012 Koha Development team
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Koha is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Koha; if not, see <http://www.gnu.org/licenses>.

use strict;
use warnings;

use C4::Context;
use C4::Debug;

use Algorithm::CheckDigits;
use Carp;

use vars qw(@ISA);
use vars qw($debug $cgi_debug);	# from C4::Debug, of course

BEGIN {
    $VERSION = 0.01;
    @ISA = qw(C4::Barcodes);
}

sub parse {
    my $self = shift;
    my $barcode = (@_) ? shift : $self->value;
    my $ean = CheckDigits('ean');
    if ( $ean->is_valid($barcode) ) {
        return ( '', $ean->basenumber($barcode), $ean->checkdigit($barcode) );
    } else {
        carp "$barcode not valid EAN-13 barcode";
        return ( '', $barcode, '' );
    }
}

sub process_tail {
    my ( $self,$tail,$whole,$specific ) = @_;
    my $ean = CheckDigits('ean');
    my $full = $ean->complete($whole);
    my $chk  = $ean->checkdigit($full);
    $debug && warn "# process_tail $tail -> $chk [$whole -> $full] $specific";
    return $chk;
}

1;
__END__
