#!/usr/bin/perl

# Copyright 2007 LibLime
# Copyright 2012 software.coop and MJ Ray
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

use strict;
use warnings;

use CGI;
use C4::Auth qw/check_api_auth/;
use C4::Biblio;
use C4::Items;
use XML::Simple;

my $query = new CGI;
binmode STDOUT, ':encoding(UTF-8)';

my ($status, $cookie, $sessionID) = check_api_auth($query, { editcatalogue => 'edit_catalogue'} );
unless ($status eq "ok") {
    print $query->header(-type => 'text/xml', -status => '403 Forbidden');
    print XMLout({ auth_status => $status }, NoAttr => 1, RootName => 'response', XMLDecl => 1);
    exit 0;
}

# do initial validation
my $path_info = $query->path_info();

my $biblionumber = undef;
if ($path_info =~ m!^/(\d+)$!) {
    $biblionumber = $1;
} else {
    print $query->header(-type => 'text/xml', -status => '400 Bad Request');
}

# are we retrieving or updating a bib?
if ($query->request_method eq "GET") {
    fetch_bib($query, $biblionumber);
} else {
    update_bib($query, $biblionumber);
}

exit 0;

sub fetch_bib {
    my $query = shift;
    my $biblionumber = shift;
    my $record = GetMarcBiblio( $biblionumber, $query->url_param('items') );
    if  (defined $record) {
        print $query->header(-type => 'text/xml');
        print $record->as_xml_record();
    } else {
        print $query->header(-type => 'text/xml', -status => '404 Not Found');
    }
}

sub update_bib {
    my $query = shift;
    my $biblionumber = shift;
    my $old_record = GetMarcBiblio($biblionumber);
    unless  (defined $old_record) {
        print $query->header(-type => 'text/xml', -status => '404 Not Found');
        return;
    }

    my $result = {};
    my $inxml = $query->param('POSTDATA');
    print $query->header(-type => 'text/xml');

    my $record = eval {MARC::Record::new_from_xml( $inxml, "utf8", C4::Context->preference('marcflavour'))};
    my $do_not_escape = 0;
    if ($@) {
        $result->{'status'} = "failed";
        $result->{'error'} = $@;
    } else {
        my $fullrecord = $record->clone();
        my ( $itemtag, $itemsubfield ) =
          GetMarcFromKohaField( "items.itemnumber", '' );

        # delete any item tags
        foreach my $field ( $record->field($itemtag) ) {
            $record->delete_field($field);
        }

        if ( $query->url_param('items') ) {
            foreach my $field ( $fullrecord->field($itemtag) ) {
                my $one_item_record = $record->clone();
                $one_item_record->add_fields($field);
                ModItemFromMarc( $one_item_record, $biblionumber,
                    $field->subfield($itemsubfield) );
            }
        }

        ModBiblio( $record, $biblionumber, '' );
        my $new_record =
          GetMarcBiblio( $biblionumber, $query->url_param('items') );

        $result->{'status'} = "ok";
        $result->{'biblionumber'} = $biblionumber;
        my $xml = $new_record->as_xml_record();
        $xml =~ s/<\?xml.*?\?>//i;
        $result->{'marcxml'} =  $xml;
        $do_not_escape = 1;
    }
   
    print XMLout($result, NoAttr => 1, RootName => 'response', XMLDecl => 1, NoEscape => $do_not_escape); 
}