+# sort in forward order first, and calculate running balances
+my $years = $conf->config('payment_history-years') || 2;
+my $older_than = time - $years * 31556926; #60*60*24*365.2422
+my $balance = 0;
+
+@history = sort { $a->{date} <=> $b->{date} } @history;
+my $i = 0;
+my $balance_forward;
+foreach my $item (@history) {
+ $balance += $item->{'charge'} if exists $item->{'charge'};
+ $balance -= $item->{'payment'} if exists $item->{'payment'};
+ $balance -= $item->{'credit'} if exists $item->{'credit'};
+ $balance += $item->{'refund'} if exists $item->{'refund'};
+ $balance = sprintf("%.2f", $balance);
+ $balance =~ s/^\-0\.00$/0.00/;
+ $item->{'balance'} = $balance;
+
+ if ( $item->{'date'} < $older_than ) {
+ $item->{'hide'} = 1;
+ } elsif ( $history[$i-1]->{'hide'} ) {
+ # this is the end of the hidden section
+ $history[$i-1]->{'balance_forward'} = 1;
+ }
+ $i++;
+}
+if ( @history and $history[-1]->{'hide'} ) {
+ # then everything is hidden
+ $history[-1]->{'balance_forward'} = 1;
+}
+
+# then sort in user-pref order
+if ( $curuser->option('history_order') eq 'newest' ) {
+ @history = sort { $b->{date} <=> $a->{date} } @history;
+} # else it's already oldest-first, and there are no other options yet
+