adamsaghy commented on code in PR #5029:
URL: https://github.com/apache/fineract/pull/5029#discussion_r2375620794


##########
fineract-progressive-loan/src/main/java/org/apache/fineract/portfolio/loanaccount/domain/transactionprocessor/impl/AdvancedPaymentScheduleTransactionProcessor.java:
##########
@@ -2842,6 +2842,54 @@ private static final class Balances {
         private Money aggregatedPenaltyChargesPortion;
     }
 
+    private void mergeReAgedInstallment(final LoanRepaymentScheduleInstallment 
target,
+            final LoanRepaymentScheduleInstallment reAgedInstallment, 
MonetaryCurrency currency, LocalDate transactionDate) {
+        target.setAdditional(false);
+        target.setReAged(true);
+        target.setFromDate(reAgedInstallment.getFromDate());
+        target.setDueDate(reAgedInstallment.getDueDate());
+        
target.setPrincipal(reAgedInstallment.getPrincipal().add(MathUtil.nullToZero(target.getPrincipalCompleted())));
+        target.setInterestCharged(reAgedInstallment.getInterestCharged());
+        target.updateObligationsMet(currency, transactionDate);
+    }
+
+    private void 
insertOrReplaceRelatedInstallment(List<LoanRepaymentScheduleInstallment> 
installments,
+            final LoanRepaymentScheduleInstallment reAgedInstallment, final 
MonetaryCurrency currency, final LocalDate transactionDate) {
+        List<LoanRepaymentScheduleInstallment> list = installments.stream()
+                .filter(installment -> 
Objects.equals(installment.getInstallmentNumber(), 
reAgedInstallment.getInstallmentNumber()))
+                
.sorted(Comparator.comparing(LoanRepaymentScheduleInstallment::getDueDate)).toList();
+        Optional<LoanRepaymentScheduleInstallment> first = Optional.empty();
+
+        if (!list.isEmpty()) {
+            first = Optional.of(list.getFirst());
+            for (int i = 1; i < list.size(); i++) {
+                LoanRepaymentScheduleInstallment installmentToAdjust = 
list.get(i);
+                
installmentToAdjust.setInstallmentNumber(installmentToAdjust.getInstallmentNumber()
 + 1);
+            }
+        }
+
+        if (first.isPresent()) {
+            int indexOfReplaceInstallment = installments.indexOf(first.get());
+            LoanRepaymentScheduleInstallment target = 
installments.get(indexOfReplaceInstallment);
+
+            if (target.isAdditional()) {
+                if 
(!target.getDueDate().isAfter(reAgedInstallment.getDueDate())) {
+                    mergeReAgedInstallment(target, reAgedInstallment, 
currency, transactionDate);
+                } else {
+                    installments.add(reAgedInstallment);
+                    int nextInstallmentNumber = target.getInstallmentNumber() 
+ 1;
+                    target.setInstallmentNumber(nextInstallmentNumber);
+                    reAgedInstallment.updateObligationsMet(currency, 
transactionDate);
+                }
+            } else {
+                mergeReAgedInstallment(target, reAgedInstallment, currency, 
transactionDate);
+            }
+        } else {
+            installments.add(reAgedInstallment);
+            reAgedInstallment.updateObligationsMet(currency, transactionDate);
+        }
+    }

Review Comment:
   Sublist + update all the rest of the installment?



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