#!/usr/bin/perl
# script that rebuild thesaurus from biblio table.

use strict;
BEGIN {
    # find Koha's Perl modules
    # test carefully before changing this
    use FindBin;
    eval { require "$FindBin::Bin/kohalib.pl" };
}

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

use Getopt::Long;
my ($version, $verbose, $mergefrom,$mergeto,$noconfirm,$batch);
GetOptions(
    'h' => \$version,
    'f:s' => \$mergefrom,
    't:s' => \$mergeto,
    'v' => \$verbose,
    'n' => \$noconfirm,
    'b' => \$batch, 
);

if ($version || ($mergefrom eq '')) {
    print <<EOF
Script to merge an authority into another
parameters :
\th : this version/help screen
\tv : verbose mode (show many things on screen)
\tf : the authority number to merge (the one that can be deleted after the merge).
\tt : the authority number where to merge
\tn : don't ask for confirmation (useful for batch mergings, should not be used on command line)
\tb : batch Merging

All biblios with the authority in -t will be modified to be "connected" to authority -f
SAMPLE :
./merge_authority.pl -f 2457 -t 531

Before doing anything, the script will show both authorities and ask for confirmation. Of course, you can merge only 2 authorities of the same kind.
EOF
;#
die;
}#/'

my $dbh = C4::Context->dbh;
# my @subf = $subfields =~ /(##\d\d\d##.)/g;

$|=1; # flushes output
my $authfrom = GetAuthority($mergefrom);
my $authto = GetAuthority($mergeto);

my $authtypecodefrom = GetAuthTypeCode($mergefrom);
my $authtypecodeto = GetAuthTypeCode($mergeto);

unless ($noconfirm) {
    print "************\n";
    print "You will merge authority : $mergefrom ($authtypecodefrom)\n".$authfrom->as_formatted;
    print "\n*************\n";
    print "Into authority : $mergeto ($authtypecodeto)\n".$authto->as_formatted;
    print "\n\nDo you confirm (enter YES)?";
    my $confirm = <STDIN>;
    chop $confirm;
    unless (uc($confirm) eq 'YES' and $authtypecodefrom eq $authtypecodeto) {
        print "IMPOSSIBLE : authorities are not of the same type ($authtypecodefrom vs $authtypecodeto) !!!\n" if $authtypecodefrom ne $authtypecodeto;
        print "Merge cancelled\n";
        exit;
    }
}
my $starttime = gettimeofday;
print "Merging\n" unless $noconfirm;
if ($batch) {
  my @authlist;
  my $cgidir = C4::Context->intranetdir ."/cgi-bin";
  unless (opendir(DIR, "$cgidir/localfile/modified_authorities")) {
    $cgidir = C4::Context->intranetdir;
    opendir(DIR, "$cgidir/localfile/modified_authorities") || die "can't opendir $cgidir/localfile/modified_authorities: $!";
  } 
  while (my $authid = readdir(DIR)) {
    if ($authid =~ /\.authid$/) {
      $authid =~ s/\.authid$//;
      print "managing $authid\n" if $verbose;
      my $MARCauth = GetAuthority($authid);
      merge($authid,$MARCauth,$authid,$MARCauth) if ($MARCauth);
      unlink $cgidir.'/localfile/modified_authorities/'.$authid.'.authid';
    }
  }
  closedir DIR;
} else {
  my $MARCfrom = GetAuthority($mergefrom);
  my $MARCto = GetAuthority($mergeto);
  &merge($mergefrom,$MARCfrom,$mergeto,$MARCto);
  #Could add mergefrom authority to mergeto rejected forms before deletion 
  DelAuthority($mergefrom);
}
my $timeneeded = gettimeofday - $starttime;
print "Done in $timeneeded seconds" unless $noconfirm;