#!/usr/bin/perl
# small script that rebuilds the non-MARC DB

use strict;

#use warnings; FIXME - Bug 2505

# Koha modules used
use Koha::Script;
use C4::Context;
use C4::Biblio  qw( GetMarcStructure );
use Time::HiRes qw( gettimeofday );

use Getopt::Long qw( GetOptions );
my ( $input_marc_file, $number ) = ( '', 0 );
my ( $version, $confirm, $test_parameter );
GetOptions(
    'c' => \$confirm,
    'h' => \$version,
    't' => \$test_parameter,
);

if ( $version || ( !$confirm ) ) {
    print <<EOF
This script cleans unused subfields in the MARC DB.
If you alter the MARC parameters and remove a subfield (ie : move it to ignore (10) tab), existing subfields are NOT removed.
It's not a bug, it prevents deleting useful values in case of erroneous move.
This script definitely remove unused subfields in the MARC DB.
syntax :
\t./cleanmarcdb.pl -h (or without arguments => shows this screen)
\t./cleanmarcdb.pl -c (c like confirm => cleans the marc DB (may be long)
\t-t => test only, change nothing in DB
EOF
        ;    #'
    die;
}

my $dbh           = C4::Context->dbh;
my $i             = 0;
my $starttime     = gettimeofday;
my $cleansubfield = $dbh->prepare("delete from marc_subfield_table where tag=? and subfieldcode=?");
my $cleanword     = $dbh->prepare("delete from marc_word where tag=? and subfieldid=?");

# get tags structure
my $tags = GetMarcStructure(1);
foreach my $tag ( sort keys( %{$tags} ) ) {
    foreach my $subfield ( sort keys( %{ $tags->{$tag} } ) ) {
        next if $subfield eq "lib";
        next if $subfield eq "mandatory";
        next if $subfield eq "tab";

        # DO NOT drop biblionumber, biblioitemnumber and itemnumber.
        # they are stored internally, and are mapped to tab -1. This script must keep them or it will completely break Koha DB !!!
        next if ( $tags->{$tag}->{$subfield}->{kohafield} eq "biblio.biblionumber" );
        next if ( $tags->{$tag}->{$subfield}->{kohafield} eq "biblioitems.biblioitemnumber" );
        next if ( $tags->{$tag}->{$subfield}->{kohafield} eq "items.itemnumber" );

        # now, test => if field is ignored (in tab -1 or '') => drop everything in the MARC table !
        if ( $tags->{$tag}->{$subfield}->{tab} eq -1 || $tags->{$tag}->{$subfield}->{tab} eq '' ) {
            print "dropping $tag \$ $subfield\n";
            $cleansubfield->execute( $tag, $subfield ) unless $test_parameter;
            $cleanword->execute( $tag, $subfield )     unless $test_parameter;
            print "TEST " if $test_parameter;
            print "done\n";
        }
    }
}
my $timeneeded = gettimeofday - $starttime;
print "done in $timeneeded seconds\n";