package C4::XISBN;
# Copyright (C) 2007 LibLime
# Joshua Ferraro <jmf@liblime.com>
#
# 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 XML::Simple;
#use LWP::Simple;
use C4::Biblio;
use C4::Koha;
use C4::External::Syndetics qw(get_syndetics_editions);
use LWP::UserAgent;
use HTTP::Request::Common;

use strict;
#use warnings; FIXME - Bug 2505
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);

BEGIN {
	require Exporter;
	$VERSION = 3.01;
	@ISA = qw(Exporter);
	@EXPORT_OK = qw(
		&get_xisbns
        &get_biblionumber_from_isbn
	);
}

sub get_biblionumber_from_isbn {
    my $isbn = shift;
   	$isbn.='%';
    my @biblionumbers;
    my $dbh=C4::Context->dbh;
    my $query = "SELECT biblionumber FROM biblioitems WHERE isbn LIKE ? LIMIT 10";
    my $sth = $dbh->prepare($query);
    $sth->execute($isbn);
	return $sth->fetchall_arrayref({});
}
=head1 NAME

C4::XISBN - Functions for retrieving XISBN content in Koha

=head1 FUNCTIONS

This module provides facilities for retrieving ThingISBN and XISBN content in Koha

=cut

sub _get_biblio_from_xisbn {
    my $xisbn = shift;
    $xisbn.='%';
    my $dbh = C4::Context->dbh;
    my $query = "SELECT biblionumber FROM biblioitems WHERE isbn LIKE ?";
    my $sth = $dbh->prepare($query);
    $sth->execute($xisbn);
    my $xbib_data =  $sth->fetchrow_hashref();
    my $xbiblio;
    if ($xbib_data->{biblionumber}) {
        $xbiblio = GetBiblioData($xbib_data->{biblionumber});
        $xbiblio->{normalized_isbn} = GetNormalizedISBN($xbiblio->{isbn});
    }
    return ($xbiblio);
}

=head1 get_xisbns($isbn);

=head2 $isbn is an ISBN string

=cut

sub get_xisbns {
    my ( $isbn ) = @_;
    my ($response,$thing_response,$xisbn_response,$syndetics_response);
    # THINGISBN
    if ( C4::Context->preference('ThingISBN') ) {
        my $url = "http://www.librarything.com/api/thingISBN/".$isbn;
        $thing_response = _get_url($url,'thingisbn');
    }

	if ( C4::Context->preference("SyndeticsEnabled") && C4::Context->preference("SyndeticsEditions") ) {
    	my $syndetics_preresponse = &get_syndetics_editions($isbn);
		my @syndetics_response;
		for my $response (@$syndetics_preresponse) {
			push @syndetics_response, {content => $response->{a}};
		}
		$syndetics_response = {isbn => \@syndetics_response};
	}

    # XISBN
    if ( C4::Context->preference('XISBN') ) {
        my $affiliate_id=C4::Context->preference('OCLCAffiliateID');
        my $limit = C4::Context->preference('XISBNDailyLimit') || 999;
        my $reached_limit = _service_throttle('xisbn',$limit);
        my $url = "http://xisbn.worldcat.org/webservices/xid/isbn/".$isbn."?method=getEditions&format=xml&fl=form,year,lang,ed";
        $url.="&ai=".$affiliate_id if $affiliate_id;
        unless ($reached_limit) {
            $xisbn_response = _get_url($url,'xisbn');
        }
    }

    $response->{isbn} = [ @{ $xisbn_response->{isbn} or [] },  @{ $syndetics_response->{isbn} or [] }, @{ $thing_response->{isbn} or [] } ];
    my @xisbns;
    my $unique_xisbns; # a hashref

    # loop through each ISBN and scope to the local collection
    for my $response_data( @{ $response->{ isbn } } ) {
        next if $response_data->{'content'} eq $isbn;
        next if $isbn eq $response_data;
        next if $unique_xisbns->{ $response_data->{content} };
        $unique_xisbns->{ $response_data->{content} }++;
        my $xbiblio= _get_biblio_from_xisbn($response_data->{content});
        push @xisbns, $xbiblio if $xbiblio;
    }
    return \@xisbns;
}

sub _get_url {
    my ($url,$service_type) = @_;
    my $ua = LWP::UserAgent->new(
        timeout => 2
        );

    my $response = $ua->get($url);
    if ($response->is_success) {
        warn "WARNING could not retrieve $service_type $url" unless $response;
        if ($response) {
            my $xmlsimple = XML::Simple->new();
            my $content = $xmlsimple->XMLin(
            $response->content,
            ForceArray => [ qw(isbn) ],
            ForceContent => 1,
            );
            return $content;
        }
    } else {
        warn "WARNING: URL Request Failed " . $response->status_line . "\n";
    }

}


# Throttle services to the specified amount
sub _service_throttle {
    my ($service_type,$daily_limit) = @_;
    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT service_count FROM services_throttle WHERE service_type=?");
    $sth->execute($service_type);
    my $count = 1;

    while (my $counter = $sth->fetchrow_hashref()) {
        $count = $counter->{service_count} if $counter->{service_count};
    }

    # we're over the limit
    return 1 if $count >= $daily_limit;

    # not over the limit
    $count++;
    $sth = $dbh->do("UPDATE services_throttle SET service_count=$count WHERE service_type='xisbn'");
    return undef;
}

1;
__END__

=head1 NOTES

=cut

=head1 AUTHOR

Joshua Ferraro <jmf@liblime.com>

=cut