show credit balance on invoices, #11564

2 files changed, 35 insertions, 0 deletions

diff --git a/FS/FS/Conf.pm b/FS/FS/Conf.pm
index 6856ccf7e..338e264f5 100644
--- a/FS/FS/Conf.pm
+++ b/FS/FS/Conf.pm
@@ -3435,6 +3435,13 @@ and customer address. Include units.',
   },
 
   {
+    'key'         => 'previous_balance-show_credit',
+    'section'     => 'invoicing',
+    'description' => 'Show the customer\'s credit balance on invoices when applicable.',
+    'type'        => 'checkbox',
+  },
+
+  {
     'key'         => 'balance_due_below_line',
     'section'     => 'invoicing',
     'description' => 'Place the balance due message below a line.  Only meaningful when when invoice_sections is false.',
diff --git a/FS/FS/cust_bill.pm b/FS/FS/cust_bill.pm
index ef0a2984e..461403a7b 100644
--- a/FS/FS/cust_bill.pm
+++ b/FS/FS/cust_bill.pm
@@ -2402,6 +2402,12 @@ sub print_generic {
                            );
   my $embolden_function = $embolden_functions{$format};
 
+  my %newline_tokens = (  'latex'     => '\\\\',
+                          'html'      => '<br>',
+                          'template'  => "\n",
+                        );
+  my $newline_token = $newline_tokens{$format};
+
   warn "$me generating template variables\n"
     if $DEBUG > 1;
 
@@ -3086,6 +3092,26 @@ sub print_generic {
       push @buf,[$self->balance_due_msg, $money_char. 
         sprintf("%10.2f", $balance_due ) ];
     }
+
+    if ( $conf->exists('previous_balance-show_credit')
+        and $cust_main->balance < 0 ) {
+      my $credit_total = {
+        'total_item'    => &$embolden_function($self->credit_balance_msg),
+        'total_amount'  => &$embolden_function(
+          $other_money_char. sprintf('%.2f', -$cust_main->balance)
+        ),
+      };
+      if ( $multisection ) {
+        $adjust_section->{'posttotal'} .= $newline_token .
+          $credit_total->{'total_item'} . ' ' . $credit_total->{'total_amount'};
+      }
+      else {
+        push @total_items, $credit_total;
+      }
+      push @buf,['','-----------'];
+      push @buf,[$self->credit_balance_msg, $money_char. 
+        sprintf("%10.2f", -$cust_main->balance ) ];
+    }
   }
 
   if ( $multisection ) {
@@ -3445,6 +3471,8 @@ sub balance_due_date {
   $duedate;
 }
 
+sub credit_balance_msg { 'Credit Balance Remaining' }
+
 =item invnum_date_pretty
 
 Returns a string with the invoice number and date, for example: