#!/usr/bin/perl -w

use strict;
use FS::UID qw(adminsuidsetup dbh);
use FS::Schema;
use FS::Record qw(qsearch qsearchs);

my $DRY_RUN = 1;
$FS::UID::AutoCommit = 0;

my ($user, $from_usernum, $to_usernum, $go) = @ARGV;
die usage() if not ($user and $from_usernum and $to_usernum);
$DRY_RUN = 0 if defined($go) and $go eq 'go';

my $dbh = adminsuidsetup($user);

# Sanity checks.
die "Can't merge a user to itself." if $from_usernum == $to_usernum;
my $from_user = FS::access_user->by_key($from_usernum) or 
    die "Usernum '$from_usernum' not found.\n";
my $to_user = FS::access_user->by_key($to_usernum) or 
    die "Usernum '$to_usernum' not found.\n";

my $tables = FS::Schema::tables_hashref;
foreach my $table (keys %$tables) {
  if( grep /^usernum$/, FS::Record::real_fields($table) ) {
    next if $table eq 'access_user';
    foreach ($table, "h_$table") {
      print "$_: ";
      my $sql;
      if( $table =~ /^access_(.*)$/ ) {
        print "deleting ";
        $sql = "DELETE FROM $_ WHERE usernum = $from_usernum";
      }
      else {
        print "updating ";
        $sql = "UPDATE $_ SET usernum = $to_usernum WHERE usernum = $from_usernum";
      }
      #print $sql;
      my $sth = $dbh->prepare($sql);
      $sth->execute;
      if($dbh->err) {
        print $dbh->errstr."\n";
        $dbh->rollback;
        exit(1);
      }
      print $sth->rows, "\n";
    }
  }
}

if($DRY_RUN) {
  warn "Dry run complete.  Reverting all changes.\n";
  $dbh->rollback;
}
else {
# Warning: access_user->delete does not transactionize because of 
# htpasswd issues.
  print "Deleting merged user.\n";
  my $error = $from_user->delete;
  die $error if $error;

  warn "Committing changes.\n";
  $dbh->commit;
}
exit(0);

sub usage {
  "Usage:\n    merge-user admin_user from_usernum to_usernum [ 'go' ]\n
  (Specify 'go' to actually apply changes.)\n\n";
}