FFZG stocknumber value_builder plugin for YEAR-NR

Squashed commit of the following:

commit 87ff20b8470895b3261a408c503ca3d0f5130025
Author: Dobrica Pavlinusic <dpavlin@rot13.org>
Date:   Tue Jan 17 19:47:27 2012 +0100

    stocknumber in YEAR-NR format

commit 9084f5a1199d9305570da122d3b383f2b2662bf8
Author: Dobrica Pavlinusic <dpavlin@rot13.org>
Date:   Tue Jan 17 18:30:11 2012 +0100

    begin value builder for inventory book

diff --git a/cataloguing/value_builder/ffzg-stocknumber.pl b/cataloguing/value_builder/ffzg-stocknumber.pl
new file mode 100755 (executable)
index 0000000..0239f37
--- /dev/null
+++ b/cataloguing/value_builder/ffzg-stocknumber.pl
@@ -0,0 +1,136 @@
+#!/usr/bin/perl
+
+# Copyright 2010 BibLibre SARL
+#
+# 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 C4::Auth;
+use CGI;
+use C4::Context;
+
+=head1 DESCRIPTION
+
+This plugin is specific to FFZG but could be used as a base for similar operations.
+It is used for stocknumber computation.
+
+If the user send an empty string, we return a simple incremented stocknumber for current year.
+If a prefix is submited, we look for the highest stocknumber with this prefix, and return it incremented.
+In this case, a stocknumber has this form : "YEAR-0009678570".
+ - YEAR is numeric 4-digit year, like 2012
+ - dash
+ - digits, without leading zero
+
+Required database changes:
+
+  create unique index item_stocknumer on items(stocknumber) ;
+
+  create table ffzg_inventarna_knjiga (
+       id int not null auto_increment primary key,
+       year int not null,
+       num int not null,
+       biblionumber int not null,
+       last_update timestamp default current_timestamp on update current_timestamp,
+       unique index ffzg_inv_br(year,num)
+  ) ;
+
+=cut
+
+sub plugin_parameters {
+}
+
+sub plugin_javascript {
+    my ($dbh,$record,$tagslib,$field_number,$tabloop) = @_;
+
+    my $res="
+    <script type='text/javascript'>
+        function Focus$field_number() {
+            return 1;
+        }
+
+        function Blur$field_number() {
+                return 1;
+        }
+
+        function Clic$field_number() {
+                var code = document.getElementById('$field_number');
+                var url = '../cataloguing/plugin_launcher.pl?plugin_name=ffzg-stocknumber.pl&code=' + code.value;
+                var blurcallbackstocknumber = {
+                    success: function(o) {
+                        var field = document.getElementById('$field_number');
+                        field.value = o.responseText;
+                        return 1;
+                    }
+                }
+                var transaction = YAHOO.util.Connect.asyncRequest('GET',url, blurcallbackstocknumber, null);
+            return 1;
+        }
+    </script>
+    ";
+
+    return ($field_number,$res);
+}
+
+sub plugin {
+    my ($input) = @_;
+
+
+    my $code = $input->param('code');
+       my ( $year, $num ) = split(/-/,$code);
+
+    $year = (localtime)[5] + 1900 unless $year;
+
+warn "XXX plugin code = $code";
+
+    my ($template, $loggedinuser, $cookie) = get_template_and_user({
+        template_name   => "cataloguing/value_builder/ajax.tmpl",
+        query           => $input,
+        type            => "intranet",
+        authnotrequired => 0,
+        flagsrequired   => {editcatalogue => '*'},
+        debug           => 1,
+    });
+
+       if ( ! $num ) {
+
+                       my $dbh = C4::Context->dbh;
+
+                       $dbh->begin_work;
+
+                       my $sth = $dbh->prepare("select max(num) from ffzg_inventarna_knjiga where year = ?");
+                       $sth->execute($year);
+                       
+                       my $max = $sth->fetchrow; # return null without any data
+                       $max += 1;
+
+                       $sth = $dbh->prepare("insert into ffzg_inventarna_knjiga (year,num) values (?,?)");
+                       $sth->execute( $year, $max );
+
+                       $dbh->commit;
+
+                       $num = $max;
+
+       }
+
+       $template->param(
+               return => $year . '-' . $num,
+       );
+
+    output_html_with_http_headers $input, $cookie, $template->output;
+}
+
+1;