FINERACT-2311: Add Buy Down Fees transaction support

fineract-loan/src/main/java/org/apache/fineract/portfolio/loanaccount/domain/LoanTransactionType.java

@@ -70,10 +70,8 @@ public enum LoanTransactionType {
     CAPITALIZED_INCOME(35, "loanTransactionType.capitalizedIncome"), //
     CAPITALIZED_INCOME_AMORTIZATION(36, "loanTransactionType.capitalizedIncomeAmortization"), //
     CAPITALIZED_INCOME_ADJUSTMENT(37, "loanTransactionType.capitalizedIncomeAdjustment"), //
-    CAPITALIZED_INCOME_AMORTIZATION_ADJUSTMENT(39, "loanTransactionType.capitalizedIncomeAmortizationAdjustment"), //
-    // Kind of Final Transactions
     CONTRACT_TERMINATION(38, "loanTransactionType.contractTermination"), //
-
+    CAPITALIZED_INCOME_AMORTIZATION_ADJUSTMENT(39, "loanTransactionType.capitalizedIncomeAmortizationAdjustment"), //
     BUY_DOWN_FEE(40, "loanTransactionType.buyDownFee"), //
     BUY_DOWN_FEE_ADJUSTMENT(41, "loanTransactionType.buyDownFeeAdjustment"), //
     BUY_DOWN_FEE_AMORTIZATION(42, "loanTransactionType.buyDownFeeAmortization"), //

fineract-progressive-loan/src/main/java/org/apache/fineract/portfolio/loanaccount/domain/LoanBuyDownFeeBalance.java

@@ -61,4 +61,5 @@ public class LoanBuyDownFeeBalance extends AbstractAuditableWithUTCDateTimeCusto
 
     @Column(name = "amount_adjustment", scale = 6, precision = 19)
     private BigDecimal amountAdjustment;
+
 }

fineract-provider/src/main/java/org/apache/fineract/portfolio/loanaccount/api/LoanTransactionsApiResource.java

@@ -689,7 +689,8 @@ private String retrieveTransactionTemplate(Long loanId, String loanExternalIdStr
             transactionData = this.loanReadPlatformService.retrieveLoanTransactionTemplate(resolvedLoanId,
                     LoanTransactionType.CAPITALIZED_INCOME_ADJUSTMENT, transactionId);
         } else if (CommandParameterUtil.is(commandParam, LoanApiConstants.BUY_DOWN_FEE_COMMAND)) {
-            transactionData = this.loanReadPlatformService.retrieveLoanTransactionTemplate(resolvedLoanId);
+            transactionData = this.loanReadPlatformService.retrieveLoanTransactionTemplate(resolvedLoanId, LoanTransactionType.BUY_DOWN_FEE,
+                    transactionId);
         } else if (CommandParameterUtil.is(commandParam, LoanApiConstants.BUY_DOWN_FEE_ADJUSTMENT_COMMAND)) {
             transactionData = this.loanReadPlatformService.retrieveLoanTransactionTemplate(resolvedLoanId,
                     LoanTransactionType.BUY_DOWN_FEE_ADJUSTMENT, transactionId);

fineract-provider/src/main/java/org/apache/fineract/portfolio/loanaccount/service/LoanBuyDownFeeAmortizationProcessingServiceImpl.java

@@ -33,7 +33,7 @@
 import org.apache.fineract.portfolio.loanaccount.domain.LoanBuyDownFeeBalance;
 import org.apache.fineract.portfolio.loanaccount.domain.LoanTransaction;
 import org.apache.fineract.portfolio.loanaccount.domain.LoanTransactionRepository;
-import org.apache.fineract.portfolio.loanaccount.repository.LoanBuyDownFeesBalanceRepository;
+import org.apache.fineract.portfolio.loanaccount.repository.LoanBuyDownFeeBalanceRepository;
 import org.apache.fineract.portfolio.loanaccount.util.BuyDownFeeAmortizationUtil;
 import org.springframework.lang.NonNull;
 import org.springframework.stereotype.Component;
@@ -44,7 +44,7 @@
 public class LoanBuyDownFeeAmortizationProcessingServiceImpl implements LoanBuyDownFeeAmortizationProcessingService {
 
     private final LoanTransactionRepository loanTransactionRepository;
-    private final LoanBuyDownFeesBalanceRepository loanBuyDownFeesBalanceRepository;
+    private final LoanBuyDownFeeBalanceRepository loanBuyDownFeeBalanceRepository;
     private final BusinessEventNotifierService businessEventNotifierService;
     private final LoanJournalEntryPoster journalEntryPoster;
     private final ExternalIdFactory externalIdFactory;
@@ -55,7 +55,7 @@ public void processBuyDownFeeAmortizationTillDate(@NonNull Loan loan, @NonNull L
         final List<Long> existingTransactionIds = loanTransactionRepository.findTransactionIdsByLoan(loan);
         final List<Long> existingReversedTransactionIds = loanTransactionRepository.findReversedTransactionIdsByLoan(loan);
 
-        List<LoanBuyDownFeeBalance> balances = loanBuyDownFeesBalanceRepository.findAllByLoanId(loan.getId());
+        List<LoanBuyDownFeeBalance> balances = loanBuyDownFeeBalanceRepository.findAllByLoanId(loan.getId());
 
         LocalDate maturityDate = loan.getMaturityDate() != null ? loan.getMaturityDate()
                 : getFinalBuyDownFeeAmortizationTransactionDate(loan);
@@ -75,7 +75,7 @@ public void processBuyDownFeeAmortizationTillDate(@NonNull Loan loan, @NonNull L
                     .subtract(amortizationTillDate.getAmount()));
         }
 
-        loanBuyDownFeesBalanceRepository.saveAll(balances);
+        loanBuyDownFeeBalanceRepository.saveAll(balances);
 
         BigDecimal totalAmortized = loanTransactionRepository.getAmortizedAmountBuyDownFee(loan);
         BigDecimal totalAmortizationAmount = totalAmortization.getAmount().subtract(totalAmortized);

fineract-provider/src/main/java/org/apache/fineract/portfolio/loanaccount/service/LoanReadPlatformServiceImpl.java

@@ -484,16 +484,41 @@ public LoanTransactionData retrieveLoanTransactionTemplate(final Long loanId, fi
         switch (transactionType) {
             case CAPITALIZED_INCOME:
                 final Loan loan = loanRepositoryWrapper.findOneWithNotFoundDetection(loanId);
+                BigDecimal capitalizedIncomeBalance = BigDecimal.ZERO;
+                BigDecimal buyDownFeeBalance = BigDecimal.ZERO;
                 if (loan.getLoanProduct().getLoanProductRelatedDetail().isEnableIncomeCapitalization()) {
-                    final BigDecimal capitalizedIncomeBalance = loanCapitalizedIncomeBalanceRepository.findAllByLoanId(loanId).stream()
+                    capitalizedIncomeBalance = loanCapitalizedIncomeBalanceRepository.findAllByLoanId(loanId).stream()
                             .map(LoanCapitalizedIncomeBalance::getAmount).reduce(BigDecimal.ZERO, BigDecimal::add);
-                    transactionAmount = loan.getApprovedPrincipal().subtract(loan.getDisbursedAmount()).subtract(capitalizedIncomeBalance);
                 }
+                // Calculate Buy Down Fee balance to subtract from Capitalized Income formula
+                buyDownFeeBalance = loanBuyDownFeeBalanceRepository.findAllByLoanId(loanId).stream().map(LoanBuyDownFeeBalance::getAmount)
+                        .reduce(BigDecimal.ZERO, BigDecimal::add);
+                transactionAmount = loan.getApprovedPrincipal().subtract(loan.getDisbursedAmount()).subtract(capitalizedIncomeBalance)
+                        .subtract(buyDownFeeBalance);
+                paymentOptions = this.paymentTypeReadPlatformService.retrieveAllPaymentTypes();
+                loanTransactionData = LoanTransactionData.loanTransactionDataForCreditTemplate(
+                        LoanEnumerations.transactionType(transactionType), DateUtils.getBusinessLocalDate(), transactionAmount,
+                        paymentOptions, retriveLoanCurrencyData(loanId));
+            break;
+            case BUY_DOWN_FEE:
+                final Loan buyDownLoan = loanRepositoryWrapper.findOneWithNotFoundDetection(loanId);
+                BigDecimal buyDownFeeBalanceForCalc = BigDecimal.ZERO;
+                BigDecimal capitalizedIncomeBalanceForCalc = BigDecimal.ZERO;
+
+                // Calculate existing Buy Down Fee balance
+                buyDownFeeBalanceForCalc = loanBuyDownFeeBalanceRepository.findAllByLoanId(loanId).stream()
+                        .map(LoanBuyDownFeeBalance::getAmount).reduce(BigDecimal.ZERO, BigDecimal::add);
+                // Calculate Capitalized Income balance to subtract from Buy Down Fee formula
+                if (buyDownLoan.getLoanProduct().getLoanProductRelatedDetail().isEnableIncomeCapitalization()) {
+                    capitalizedIncomeBalanceForCalc = loanCapitalizedIncomeBalanceRepository.findAllByLoanId(loanId).stream()
+                            .map(LoanCapitalizedIncomeBalance::getAmount).reduce(BigDecimal.ZERO, BigDecimal::add);
+                }
+                transactionAmount = buyDownLoan.getApprovedPrincipal().subtract(buyDownLoan.getDisbursedAmount())
+                        .subtract(buyDownFeeBalanceForCalc).subtract(capitalizedIncomeBalanceForCalc);
                 paymentOptions = this.paymentTypeReadPlatformService.retrieveAllPaymentTypes();
                 loanTransactionData = LoanTransactionData.loanTransactionDataForCreditTemplate(
                         LoanEnumerations.transactionType(transactionType), DateUtils.getBusinessLocalDate(), transactionAmount,
                         paymentOptions, retriveLoanCurrencyData(loanId));
-
             break;
             case CAPITALIZED_INCOME_ADJUSTMENT:
                 final LoanCapitalizedIncomeBalance loanCapitalizedIncomeBalance = loanCapitalizedIncomeBalanceRepository

fineract-provider/src/main/java/org/apache/fineract/portfolio/loanaccount/starter/LoanAccountConfiguration.java

@@ -567,10 +567,10 @@ public LoanCapitalizedIncomeAmortizationProcessingService loanCapitalizedIncomeA
     @ConditionalOnMissingBean(LoanBuyDownFeeAmortizationProcessingService.class)
     public LoanBuyDownFeeAmortizationProcessingService loanBuyDownFeeAmortizationProcessingService(
             final LoanTransactionRepository loanTransactionRepository,
-            final LoanBuyDownFeesBalanceRepository loanBuyDownFeesBalanceRepository,
+            final LoanBuyDownFeeBalanceRepository loanBuyDownFeeBalanceRepository,
             final BusinessEventNotifierService businessEventNotifierService, final LoanJournalEntryPoster journalEntryPoster,
             final ExternalIdFactory externalIdFactory) {
-        return new LoanBuyDownFeeAmortizationProcessingServiceImpl(loanTransactionRepository, loanBuyDownFeesBalanceRepository,
+        return new LoanBuyDownFeeAmortizationProcessingServiceImpl(loanTransactionRepository, loanBuyDownFeeBalanceRepository,
                 businessEventNotifierService, journalEntryPoster, externalIdFactory);
     }
 }

integration-tests/src/test/java/org/apache/fineract/integrationtests/LoanTransactionTest.java

@@ -208,4 +208,33 @@ public void testGetLoanTransactionTemplateForBuyDownFeeAdjustment() {
         });
     }
 
+    @Test
+    public void testGetLoanTransactionTemplateForBuyDownFee() {
+        final PostClientsResponse client = clientHelper.createClient(ClientHelper.defaultClientCreationRequest());
+
+        final PostLoanProductsResponse loanProductsResponse = loanProductHelper
+                .createLoanProduct(create4IProgressive().enableIncomeCapitalization(true)
+                        .capitalizedIncomeCalculationType(PostLoanProductsRequest.CapitalizedIncomeCalculationTypeEnum.FLAT)
+                        .capitalizedIncomeStrategy(PostLoanProductsRequest.CapitalizedIncomeStrategyEnum.EQUAL_AMORTIZATION)
+                        .deferredIncomeLiabilityAccountId(deferredIncomeLiabilityAccount.getAccountID().longValue())
+                        .incomeFromCapitalizationAccountId(feeIncomeAccount.getAccountID().longValue())
+                        .capitalizedIncomeType(PostLoanProductsRequest.CapitalizedIncomeTypeEnum.FEE));
+
+        final String loanExternalIdStr = UUID.randomUUID().toString();
+
+        runAt("20 December 2024", () -> {
+            Long loanId = applyAndApproveProgressiveLoan(client.getClientId(), loanProductsResponse.getResourceId(), "20 December 2024",
+                    430.0, 7.0, 6, (request) -> request.externalId(loanExternalIdStr));
+
+            disburseLoan(loanId, BigDecimal.valueOf(230), "20 December 2024");
+
+            final GetLoansLoanIdTransactionsTemplateResponse transactionTemplate = loanTransactionHelper.retrieveTransactionTemplate(loanId,
+                    buyDownFeeCommand, null, null, null);
+
+            assertNotNull(transactionTemplate);
+            assertEquals("loanTransactionType." + buyDownFeeCommand, transactionTemplate.getType().getCode());
+            assertEquals(transactionTemplate.getAmount(), 200);
+            assertThat(transactionTemplate.getPaymentTypeOptions().size() > 0);
+        });
+    }
 }

integration-tests/src/test/java/org/apache/fineract/integrationtests/common/ExternalEventConfigurationHelper.java

@@ -636,15 +636,15 @@ public static ArrayList<Map<String, Object>> getDefaultExternalEventConfiguratio
         loanTransactionUndoContractTerminationBusinessEvent.put("enabled", false);
         defaults.add(loanTransactionUndoContractTerminationBusinessEvent);
 
-        Map<String, Object> loanBuyDownFeeTransactionCreatedBusinessEvent = new HashMap<>();
-        loanBuyDownFeeTransactionCreatedBusinessEvent.put("type", "LoanBuyDownFeeTransactionCreatedBusinessEvent");
-        loanBuyDownFeeTransactionCreatedBusinessEvent.put("enabled", false);
-        defaults.add(loanBuyDownFeeTransactionCreatedBusinessEvent);
-
-        Map<String, Object> loanBuyDownFeeAdjustmentTransactionCreatedBusinessEvent = new HashMap<>();
-        loanBuyDownFeeAdjustmentTransactionCreatedBusinessEvent.put("type", "LoanBuyDownFeeAdjustmentTransactionCreatedBusinessEvent");
-        loanBuyDownFeeAdjustmentTransactionCreatedBusinessEvent.put("enabled", false);
-        defaults.add(loanBuyDownFeeAdjustmentTransactionCreatedBusinessEvent);
+        Map<String, Object> loanTransactionBuyDownFeePostBusinessEvent = new HashMap<>();
+        loanTransactionBuyDownFeePostBusinessEvent.put("type", "LoanBuyDownFeeTransactionCreatedBusinessEvent");
+        loanTransactionBuyDownFeePostBusinessEvent.put("enabled", false);
+        defaults.add(loanTransactionBuyDownFeePostBusinessEvent);
+
+        Map<String, Object> loanTransactionBuyDownFeeAdjustmentPostBusinessEvent = new HashMap<>();
+        loanTransactionBuyDownFeeAdjustmentPostBusinessEvent.put("type", "LoanBuyDownFeeAdjustmentTransactionCreatedBusinessEvent");
+        loanTransactionBuyDownFeeAdjustmentPostBusinessEvent.put("enabled", false);
+        defaults.add(loanTransactionBuyDownFeeAdjustmentPostBusinessEvent);
 
         Map<String, Object> loanBuyDownFeeAmortizationTransactionCreatedBusinessEvent = new HashMap<>();
         loanBuyDownFeeAmortizationTransactionCreatedBusinessEvent.put("type", "LoanBuyDownFeeAmortizationTransactionCreatedBusinessEvent");