#!/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 <https://www.gnu.org/licenses>.
#

use Modern::Perl;

use CGI        qw ( -utf8 );
use C4::Auth   qw( check_api_auth );
use C4::Biblio qw( GetFrameworkCode );
use C4::Items;
use XML::Simple;
use Koha::Biblios;

my $query = CGI->new;
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, $biblionumber ) = @_;
    my $biblio = Koha::Biblios->find($biblionumber);
    my $record;
    my $exception;
    my $invalid_metadata = 0;
    if ( defined $biblio ) {
        eval { $record = $biblio->metadata_record( { embed_items => scalar $query->param('items') } ) };
        if ($@) {
            $exception = $@;
            $exception->rethrow unless ( $exception->isa('Koha::Exceptions::Metadata::Invalid') );
            $record = $biblio->metadata->record_strip_nonxml( { embed_items => scalar $query->param('items') } );
            $invalid_metadata = 1;
        }
        print $query->header( -type => 'text/xml', -charset => 'utf-8', -invalid_metadata => $invalid_metadata );
        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 $biblio        = Koha::Biblios->find($biblionumber);
    my $old_record    = $biblio->metadata;
    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, "UTF-8", C4::Context->preference('marcflavour') ) };
    my $do_not_escape = 0;
    if ($@) {
        $result->{'status'} = "failed";
        $result->{'error'}  = $@;
    } else {
        my $fullrecord = $record->clone();
        my ( $itemtag, $itemsubfield ) = C4::Biblio::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);
                C4::Items::ModItemFromMarc(
                    $one_item_record, $biblionumber,
                    $field->subfield($itemsubfield)
                );
            }
        }

        C4::Biblio::ModBiblio( $record, $biblionumber, $frameworkcode );
        my $biblio     = Koha::Biblios->find($biblionumber);
        my $new_record = $biblio->metadata_record( { 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 $error        = C4::Biblio::DelBiblio($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 );
}