package C4::Amazon;
# Copyright (C) 2006 LibLime
# <jmf at liblime dot 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., 59 Temple Place,
# Suite 330, Boston, MA  02111-1307 USA

use XML::Simple;
use LWP::Simple;
use LWP::UserAgent;
use HTTP::Request::Common;

use strict;

use vars qw($VERSION @ISA @EXPORT);

BEGIN {
    require Exporter;
    $VERSION = 0.03;
    @ISA = qw(Exporter);
    @EXPORT = qw(
        &get_amazon_details
        &check_search_inside
    );
}

=head1 NAME

C4::Amazon - Functions for retrieving Amazon.com content in Koha

=head1 FUNCTIONS

This module provides facilities for retrieving Amazon.com content in Koha

=head1 get_amazon_details($isbn);

=head2 $isbn is a isbn string

=cut

sub get_amazon_details {
    my ( $isbn ) = @_;
    #normalize the ISBN
    $isbn =~ s/(p|-|:| )//g;

    # Determine which content to grab in the request

    # Determine correct locale
    my $locale_hashref = {
        CA => '.ca',
        DE => '.de',
        FR => '.fr',
        JP => '.jp',
        UK => '.co.uk',
        US => '.com',
    };

    my $amazon_locale_syspref = C4::Context->preference('AmazonLocale');
    my $tld = $locale_hashref->{$amazon_locale_syspref} || '.com'; # default top level domain is .com

    # grab the AWSAccessKeyId: mine is '0V5RRRRJZ3HR2RQFNHR2'
    my $aws_access_key_id = C4::Context->preference('AWSAccessKeyID');

    #grab the associates tag: mine is 'kadabox-20'
    my $af_tag=C4::Context->preference('AmazonAssocTag');
    my $response_group = "Similarities,EditorialReview,Reviews,ItemAttributes";
    my $asin=$isbn;
    my $url = "http://ecs.amazonaws$tld/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=$aws_access_key_id&Operation=ItemLookup&AssociateTag=$af_tag&Version=2007-01-15&ItemId=$asin&ResponseGroup=$response_group";
    # warn $url;
    my $content = get($url);
    warn "could not retrieve $url" unless $content;
    my $xmlsimple = XML::Simple->new();
    my $response = $xmlsimple->XMLin(
        $content,
        forcearray => [ qw(SimilarProduct EditorialReview Review) ],
    );
    return $response;
}

sub check_search_inside {
        my $isbn = shift;
        my $ua = LWP::UserAgent->new(
        agent => "Mozilla/4.76 [en] (Win98; U)",
        keep_alive => 1,
        env_proxy => 1,
        );
        my $available = 1;
        my $uri = "http://www.amazon.com/gp/reader/$isbn/ref=sib_dp_pt/002-7879865-0184864#reader-link";
        my $req = HTTP::Request->new(GET => $uri);
        $req->header (
                'Accept' => 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*',
                'Accept-Charset' => 'iso-8859-1,*,utf-8',
                'Accept-Language' => 'en-US' );
        my $res = $ua->request($req);
        my $content = $res->content();
        if ($content =~ m/This book is temporarily unavailable/) {
            undef $available;
        }
        return $available;
}

1;
__END__

=head1 NOTES

=head1 AUTHOR

Joshua Ferraro <jmf@liblime.com>

=cut