+=item apply_payments_and_credits
+
+=cut
+
+sub apply_payments_and_credits {
+ my $self = shift;
+
+ my @payments = grep { $_->unapplied > 0 } $self->cust_main->cust_pay;
+ my @credits = grep { $_->credited > 0 } $self->cust_main->cust_credit;
+
+ while ( $self->owed > 0 and ( @payments || @credits ) ) {
+
+ my $app = '';
+ if ( @payments && @credits ) {
+
+ #decide which goes first by weight of top (unapplied) line item
+
+ my @open_lineitems = $self->open_cust_bill_pkg;
+
+ my $max_pay_weight =
+ max( map { $_->part_pkg->pay_weight || 0 }
+ grep { $_ }
+ map { $_->cust_pkg }
+ @open_lineitems
+ );
+ my $max_credit_weight =
+ max( map { $_->part_pkg->credit_weight || 0 }
+ grep { $_ }
+ map { $_->cust_pkg }
+ @open_lineitems
+ );
+
+ #if both are the same... payments first? it has to be something
+ if ( $max_pay_weight >= $max_credit_weight ) {
+ $app = 'pay';
+ } else {
+ $app = 'credit';
+ }
+
+ } elsif ( @payments ) {
+ $app = 'pay';
+ } elsif ( @credits ) {
+ $app = 'credit';
+ } else {
+ die "guru meditation #12 and 35";
+ }
+
+ if ( $app eq 'pay' ) {
+
+ my $payment = shift @payments;
+
+ $app = new FS::cust_bill_pay {
+ 'paynum' => $payment->paynum,
+ 'amount' => sprintf('%.2f', min( $payment->unapplied, $self->owed ) ),
+ };
+
+ } elsif ( $app eq 'credit' ) {
+
+ my $credit = shift @credits;
+
+ $app = new FS::cust_credit_bill {
+ 'crednum' => $credit->crednum,
+ 'amount' => sprintf('%.2f', min( $credit->credited, $self->owed ) ),
+ };
+
+ } else {
+ die "guru meditation #12 and 35";
+ }
+
+ $app->invnum( $self->invnum );
+
+ my $error = $app->insert;
+ die $error if $error;
+
+ }
+
+}