#!/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 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 Modern::Perl;

use CGI qw ( -utf8 );
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, updating or deleting a bib?
if ($query->request_method eq "GET") {
    fetch_bib($query, $biblionumber);
} elsif ($query->request_method eq "POST") {
    update_bib($query, $biblionumber);
} elsif ($query->request_method eq "DELETE") {
    delete_bib($query, $biblionumber);
} else {
    print $query->header(-type => 'text/xml', -status => '405 Method not allowed');
    print XMLout({ error => 'Method not allowed' }, NoAttr => 1, RootName => 'response', XMLDecl => 1);
    exit 0;
}

exit 0;

sub fetch_bib {
    my $query = shift;
    my $biblionumber = shift;
    my $record = GetMarcBiblio({
        biblionumber => $biblionumber,
        embed_items  => scalar $query->param('items') });
    if  (defined $record) {
        print $query->header(-type => 'text/xml',-charset => 'utf-8',);
        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 => $biblionumber });
    my $frameworkcode = $query->url_param('frameworkcode') // GetFrameworkCode($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', -charset => 'utf-8');

    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, $frameworkcode );
        my $new_record = GetMarcBiblio({
            biblionumber => $biblionumber,
            embed_items  => scalar $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); 
}

sub delete_bib {
    my $query = shift;
    my $biblionumber = shift;
    my $error = DelBiblio($biblionumber);

    if (defined $error) {
        print $query->header(-type => 'text/xml', -status => '400 Bad request');
        print XMLout({ error => $error }, NoAttr => 1, RootName => 'response', XMLDecl => 1);
        exit 0;
    }

    print $query->header(-type => 'text/xml');
    print XMLout({ status => 'OK, biblio deleted' }, NoAttr => 1, RootName => 'response', XMLDecl => 1);
}