MIFOSX-2434 : junit test cases for variable instalments

mifosng-provider/src/integrationTest/java/org/mifosplatform/integrationtests/common/loans/LoanProductTestBuilder.java

@@ -105,6 +105,10 @@ public class LoanProductTestBuilder {
     private String graceOnInterestPayment = "1";
     private JsonObject allowAttributeOverrides = null;
     private Boolean allowPartialPeriodInterestCalcualtion = false;
+    
+    private Boolean allowVariableInstallments = Boolean.FALSE;
+    private Integer minimumGap;
+    private Integer maximumGap;
 
     public String build(final String chargeId) {
         final HashMap<String, Object> map = new HashMap<>();
@@ -185,6 +189,11 @@ public class LoanProductTestBuilder {
             map.put("allowAttributeOverrides", this.allowAttributeOverrides);
         }
         map.put("allowPartialPeriodInterestCalcualtion", this.allowPartialPeriodInterestCalcualtion);
+        map.put("allowVariableInstallments", allowVariableInstallments) ;
+        if(allowVariableInstallments) {
+            map.put("minimumGap", minimumGap) ;
+            map.put("maximumGap", maximumGap) ;
+        }
         return new Gson().toJson(map);
     }
 
@@ -461,4 +470,11 @@ public class LoanProductTestBuilder {
         this.allowAttributeOverrides = loanProductConfigurableAttributes;
         return this;
     }
+    
+    public LoanProductTestBuilder withVariableInstallmentsConfig(Boolean allowVariableInstallments, Integer minimumGap, Integer maximumGap) {
+        this.allowVariableInstallments = allowVariableInstallments ;
+        this.minimumGap = minimumGap;
+        this.maximumGap = maximumGap;
+        return this ;
+    }
 }

mifosng-provider/src/integrationTest/java/org/mifosplatform/integrationtests/variableinstallments/VariableInstallmentsDecliningBalanceHelper.java

@@ -0,0 +1,298 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.mifosplatform.integrationtests.variableinstallments;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.mifosplatform.integrationtests.common.accounting.Account;
+import org.mifosplatform.integrationtests.common.loans.LoanApplicationTestBuilder;
+import org.mifosplatform.integrationtests.common.loans.LoanProductTestBuilder;
+
+import com.google.gson.Gson;
+
+@SuppressWarnings({"rawtypes", "unchecked"})
+public class VariableInstallmentsDecliningBalanceHelper {
+
+    public static String createLoanProductWithoutVaribleConfig(final boolean multiDisburseLoan, final String accountingRule, final Account... accounts) {
+        System.out.println("------------------------------CREATING NEW LOAN PRODUCT ---------------------------------------");
+        final String loanProductJSON = new LoanProductTestBuilder() //
+                .withPrincipal("1,00,000.00") //
+                .withNumberOfRepayments("4") //
+                .withRepaymentAfterEvery("1") //
+                .withRepaymentTypeAsMonth() //
+                .withinterestRatePerPeriod("1") //
+                .withInterestRateFrequencyTypeAsMonths() //
+                .withAmortizationTypeAsEqualInstallments() //
+                .withInterestTypeAsDecliningBalance() //
+                .withTranches(multiDisburseLoan) //
+                .withAccounting(accountingRule, accounts).build(null);
+       return loanProductJSON ;
+    }
+    
+    public static String createLoanProductWithVaribleConfig(final boolean multiDisburseLoan, final String accountingRule, final Account... accounts) {
+        System.out.println("------------------------------CREATING NEW LOAN PRODUCT ---------------------------------------");
+        final String loanProductJSON = new LoanProductTestBuilder() //
+                .withPrincipal("1,00,000.00") //
+                .withNumberOfRepayments("4") //
+                .withRepaymentAfterEvery("1") //
+                .withRepaymentTypeAsMonth() //
+                .withinterestRatePerPeriod("1") //
+                .withInterestRateFrequencyTypeAsMonths() //
+                .withAmortizationTypeAsEqualInstallments() //
+                .withInterestTypeAsDecliningBalance() //
+                .withTranches(multiDisburseLoan) //
+                .withInterestCalculationPeriodTypeAsRepaymentPeriod(true)//
+                .withVariableInstallmentsConfig(Boolean.TRUE, new Integer(5), new Integer(90))//
+                .withAccounting(accountingRule, accounts).build(null);
+        return loanProductJSON ;
+    }
+    
+    public static String createLoanProductWithVaribleConfigwithEqualPrincipal(final boolean multiDisburseLoan, final String accountingRule, final Account... accounts) {
+        System.out.println("------------------------------CREATING NEW LOAN PRODUCT ---------------------------------------");
+        final String loanProductJSON = new LoanProductTestBuilder() //
+                .withPrincipal("1,00,000.00") //
+                .withNumberOfRepayments("4") //
+                .withRepaymentAfterEvery("1") //
+                .withRepaymentTypeAsMonth() //
+                .withinterestRatePerPeriod("1") //
+                .withInterestRateFrequencyTypeAsMonths() //
+                .withAmortizationTypeAsEqualPrincipalPayment() //
+                .withInterestTypeAsDecliningBalance() //
+                .withTranches(multiDisburseLoan) //
+                .withInterestCalculationPeriodTypeAsRepaymentPeriod(true)//
+                .withVariableInstallmentsConfig(Boolean.TRUE, new Integer(5), new Integer(90))//
+                .withAccounting(accountingRule, accounts).build(null);
+        return loanProductJSON ;
+    }
+    
+    public static String applyForLoanApplication(final Integer clientID, final Integer loanProductID, List<HashMap> charges,
+            final String savingsId, String principal) {
+        System.out.println("--------------------------------APPLYING FOR LOAN APPLICATION--------------------------------");
+        final String loanApplicationJSON = new LoanApplicationTestBuilder() //
+                .withPrincipal(principal) //
+                .withLoanTermFrequency("4") //
+                .withLoanTermFrequencyAsMonths() //
+                .withNumberOfRepayments("4") //
+                .withRepaymentEveryAfter("1") //
+                .withRepaymentFrequencyTypeAsMonths() //
+                .withInterestRatePerPeriod("2") //
+                .withAmortizationTypeAsEqualInstallments() //
+                .withInterestTypeAsDecliningBalance() //
+                .withInterestCalculationPeriodTypeSameAsRepaymentPeriod() //
+                .withExpectedDisbursementDate("20 September 2011") //
+                .withSubmittedOnDate("20 September 2011") //
+                .withCharges(charges).build(clientID.toString(), loanProductID.toString(), savingsId);
+        return loanApplicationJSON ;
+    }
+    
+    public static String applyForLoanApplicationWithEqualPrincipal(final Integer clientID, final Integer loanProductID, List<HashMap> charges,
+            final String savingsId, String principal) {
+        System.out.println("--------------------------------APPLYING FOR LOAN APPLICATION--------------------------------");
+        final String loanApplicationJSON = new LoanApplicationTestBuilder() //
+                .withPrincipal(principal) //
+                .withLoanTermFrequency("4") //
+                .withLoanTermFrequencyAsMonths() //
+                .withNumberOfRepayments("4") //
+                .withRepaymentEveryAfter("1") //
+                .withRepaymentFrequencyTypeAsMonths() //
+                .withInterestRatePerPeriod("2") //
+                .withAmortizationTypeAsEqualPrincipalPayments() //
+                .withInterestTypeAsDecliningBalance() //
+                .withInterestCalculationPeriodTypeSameAsRepaymentPeriod() //
+                .withExpectedDisbursementDate("20 September 2011") //
+                .withSubmittedOnDate("20 September 2011") //
+                .withCharges(charges).build(clientID.toString(), loanProductID.toString(), savingsId);
+        return loanApplicationJSON ;
+    }
+    
+    public static String createDeleteVariations(ArrayList<Map> deletedInstallments) {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("deletedinstallments", createDeletedMap(deletedInstallments));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+
+    private static ArrayList createDeletedMap(ArrayList<Map> deletedItems) {
+        ArrayList toReturn = new ArrayList<>();
+        for (Map map : deletedItems) {
+            ArrayList dueDate = (ArrayList) map.get("dueDate");
+            Map tosend = new HashMap();
+            tosend.put("dueDate", formatDate(dueDate));
+            toReturn.add(tosend);
+        }
+        return toReturn;
+    }
+
+    public static String createAddVariations() {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("newinstallments", createNewInstallments());
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+
+    private static ArrayList createNewInstallments() {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", "31 October 2011");
+        tosend.put("installmentAmount", "5000");
+        toReturn.add(tosend);
+        return toReturn;
+    }
+
+    public static String createModifiyVariations(Map firstSchedule) {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("modifiedinstallments", createModifyMap(firstSchedule));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+    
+    private static ArrayList createNewInstallments(String date) {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", date);
+        tosend.put("installmentAmount", "5000");
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    private static ArrayList createModifyMap(Map firstSchedule) {
+        ArrayList toReturn = new ArrayList<>();
+        ArrayList dueDate = (ArrayList) firstSchedule.get("dueDate");
+        Map tosend = new HashMap();
+        tosend.put("dueDate", formatDate(dueDate));
+        tosend.put("installmentAmount", 30000) ;
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    public static String createAllVariations() {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("modifiedinstallments", createModifyMap("20 November 2011"));
+        exceptions.put("newinstallments", createNewInstallments("25 December 2011"));
+        exceptions.put("deletedinstallments", createDeletedMap("20 December 2011"));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+    
+    public static String createAllVariationsWithEqualPrincipal() {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("modifiedinstallments", createModifyMapWithPrinciapl("20 November 2011"));
+        exceptions.put("newinstallments", createNewInstallmentsWithPrincipal("25 December 2011"));
+        exceptions.put("deletedinstallments", createDeletedMap("20 December 2011"));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+    
+    private static ArrayList createNewInstallmentsWithPrincipal(String date) {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", date);
+        tosend.put("principal", "5000");
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    private static ArrayList createModifyMapWithPrinciapl(String date) {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", date);
+        tosend.put("principal", 30000) ;
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    private static ArrayList createDeletedMap(String date) {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", date);
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    private static ArrayList createModifyMap(String date) {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", date);
+        tosend.put("installmentAmount", 30000) ;
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    public static String createModifiyDateVariations(String[] date, String[] newdate, String[] principal) {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("modifiedinstallments", createDateModifyMap(date, newdate, principal));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+    
+    private static ArrayList createDateModifyMap(String[] date, String[] newdate, String[] installments) {
+        ArrayList toReturn = new ArrayList<>();
+        for(int i = 0 ; i < date.length; i++) {
+            Map tosend = new HashMap();
+            tosend.put("dueDate", date[i]);
+            tosend.put("modifiedDueDate", newdate[i]) ;
+            if(i < installments.length) {
+                tosend.put("installmentAmount", installments[i]) ;
+            }
+            toReturn.add(tosend);    
+        }
+        return toReturn;
+    }
+    public static String formatDate(ArrayList list) {
+        Calendar cal = Calendar.getInstance();
+        cal.set(Calendar.YEAR, (int) list.get(0));
+        cal.set(Calendar.MONTH, (int) list.get(1) - 1);
+        cal.set(Calendar.DAY_OF_MONTH, (int) list.get(2));
+        Date date = cal.getTime();
+        DateFormat requiredFormat = new SimpleDateFormat("dd MMMM YYYY");
+        return requiredFormat.format(date);
+    }
+
+    public Map<String, Object> createModifyVarations() {
+        return null;
+    }
+
+    public static ArrayList<Map> constructVerifyData(String[] dates, String[] installments) {
+        ArrayList<Map> toReturn = new ArrayList<>();
+        for (int i = 0; i < dates.length; i++) {
+            Map<String, String> map = new HashMap<>();
+            map.put("dueDate", dates[i]);
+            map.put("installmentAmount", installments[i]);
+            toReturn.add(map);
+        }
+        return toReturn;
+    }
+}

mifosng-provider/src/integrationTest/java/org/mifosplatform/integrationtests/variableinstallments/VariableInstallmentsFlatHelper.java

@@ -0,0 +1,217 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.mifosplatform.integrationtests.variableinstallments;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.mifosplatform.integrationtests.common.accounting.Account;
+import org.mifosplatform.integrationtests.common.loans.LoanApplicationTestBuilder;
+import org.mifosplatform.integrationtests.common.loans.LoanProductTestBuilder;
+
+import com.google.gson.Gson;
+
+@SuppressWarnings({"rawtypes", "unchecked"})
+public class VariableInstallmentsFlatHelper {
+
+    public static String createLoanProductWithVaribleConfig(final boolean multiDisburseLoan, final String accountingRule, final Account... accounts) {
+        System.out.println("------------------------------CREATING NEW LOAN PRODUCT ---------------------------------------");
+        final String loanProductJSON = new LoanProductTestBuilder() //
+                .withPrincipal("1,00,000.00") //
+                .withNumberOfRepayments("4") //
+                .withRepaymentAfterEvery("1") //
+                .withRepaymentTypeAsMonth() //
+                .withinterestRatePerPeriod("1") //
+                .withAmortizationTypeAsEqualPrincipalPayment() 
+                .withInterestTypeAsFlat() //
+                .withTranches(multiDisburseLoan) //
+                .withInterestCalculationPeriodTypeAsRepaymentPeriod(true)//
+                .withVariableInstallmentsConfig(Boolean.TRUE, new Integer(5), new Integer(90))//
+                .withAccounting(accountingRule, accounts).build(null);
+        return loanProductJSON ;
+    }
+    
+   
+    
+    public static String applyForLoanApplication(final Integer clientID, final Integer loanProductID, List<HashMap> charges,
+            final String savingsId, String principal) {
+        System.out.println("--------------------------------APPLYING FOR LOAN APPLICATION--------------------------------");
+        final String loanApplicationJSON = new LoanApplicationTestBuilder() //
+                .withPrincipal(principal) //
+                .withLoanTermFrequency("4") //
+                .withLoanTermFrequencyAsMonths() //
+                .withNumberOfRepayments("4") //
+                .withRepaymentEveryAfter("1") //
+                .withRepaymentFrequencyTypeAsMonths() //
+                .withInterestRatePerPeriod("2") //
+                .withAmortizationTypeAsEqualPrincipalPayments() //
+                .withInterestTypeAsFlatBalance() //
+                .withInterestCalculationPeriodTypeSameAsRepaymentPeriod() //
+                .withExpectedDisbursementDate("20 September 2011") //
+                .withSubmittedOnDate("20 September 2011") //
+                .withCharges(charges).build(clientID.toString(), loanProductID.toString(), savingsId);
+        return loanApplicationJSON ;
+    }
+    
+    public static String createDeleteVariations(ArrayList<Map> deletedInstallments) {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("deletedinstallments", createDeletedMap(deletedInstallments));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+
+    private static ArrayList createDeletedMap(ArrayList<Map> deletedItems) {
+        ArrayList toReturn = new ArrayList<>();
+        for (Map map : deletedItems) {
+            ArrayList dueDate = (ArrayList) map.get("dueDate");
+            Map tosend = new HashMap();
+            tosend.put("dueDate", formatDate(dueDate));
+            toReturn.add(tosend);
+        }
+        return toReturn;
+    }
+
+    public static String createAddVariations() {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("newinstallments", createNewInstallments());
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+
+    private static ArrayList createNewInstallments() {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", "31 October 2011");
+        tosend.put("principal", "5000");
+        toReturn.add(tosend);
+        return toReturn;
+    }
+
+    public static String createModifiyVariations(Map firstSchedule) {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("modifiedinstallments", createModifyMap(firstSchedule));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+    
+    private static ArrayList createNewInstallments(String date) {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", date);
+        tosend.put("principal", "5000");
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    public static String createModifiyDateVariations(String[] date, String[] newdate, String[] principal) {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("modifiedinstallments", createDateModifyMap(date, newdate, principal));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+    
+    private static ArrayList createDateModifyMap(String[] date, String[] newdate, String[] principal) {
+        ArrayList toReturn = new ArrayList<>();
+        for(int i = 0 ; i < date.length; i++) {
+            Map tosend = new HashMap();
+            tosend.put("dueDate", date[i]);
+            tosend.put("modifiedDueDate", newdate[i]) ;
+            if(i < principal.length) {
+                tosend.put("principal", principal[i]) ;
+            }
+            toReturn.add(tosend);    
+        }
+        return toReturn;
+    }
+    
+    
+    private static ArrayList createModifyMap(Map firstSchedule) {
+        ArrayList toReturn = new ArrayList<>();
+        ArrayList dueDate = (ArrayList) firstSchedule.get("dueDate");
+        Map tosend = new HashMap();
+        tosend.put("dueDate", formatDate(dueDate));
+        tosend.put("principal", 30000) ;
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    public static String createAllVariations() {
+        Map<String, Object> toReturn = new HashMap<>();
+        toReturn.put("locale", "en");
+        toReturn.put("dateFormat", "dd MMMM yyyy");
+        Map exceptions = new HashMap<>();
+        exceptions.put("modifiedinstallments", createModifyMap("20 November 2011"));
+        exceptions.put("newinstallments", createNewInstallments("25 December 2011"));
+        exceptions.put("deletedinstallments", createDeletedMap("20 December 2011"));
+        toReturn.put("exceptions", exceptions);
+        String json = new Gson().toJson(toReturn);
+        return json;
+    }
+    
+    private static ArrayList createDeletedMap(String date) {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", date);
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    private static ArrayList createModifyMap(String date) {
+        ArrayList toReturn = new ArrayList<>();
+        Map tosend = new HashMap();
+        tosend.put("dueDate", date);
+        tosend.put("principal", 30000) ;
+        toReturn.add(tosend);
+        return toReturn;
+    }
+    
+    public static String formatDate(ArrayList list) {
+        Calendar cal = Calendar.getInstance();
+        cal.set(Calendar.YEAR, (int) list.get(0));
+        cal.set(Calendar.MONTH, (int) list.get(1) - 1);
+        cal.set(Calendar.DAY_OF_MONTH, (int) list.get(2));
+        Date date = cal.getTime();
+        DateFormat requiredFormat = new SimpleDateFormat("dd MMMM YYYY");
+        return requiredFormat.format(date);
+    }
+
+    public Map<String, Object> createModifyVarations() {
+        return null;
+    }
+
+    public static ArrayList<Map> constructVerifyData(String[] dates, String[] installments) {
+        ArrayList<Map> toReturn = new ArrayList<>();
+        for (int i = 0; i < dates.length; i++) {
+            Map<String, String> map = new HashMap<>();
+            map.put("dueDate", dates[i]);
+            map.put("installmentAmount", installments[i]);
+            toReturn.add(map);
+        }
+        return toReturn;
+    }
+}

mifosng-provider/src/integrationTest/java/org/mifosplatform/integrationtests/variableinstallments/VariableInstallmentsIntegrationTest.java

@@ -0,0 +1,427 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.mifosplatform.integrationtests.variableinstallments;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.mifosplatform.integrationtests.common.ClientHelper;
+import org.mifosplatform.integrationtests.common.Utils;
+import org.mifosplatform.integrationtests.common.loans.LoanStatusChecker;
+import org.mifosplatform.integrationtests.common.loans.LoanTransactionHelper;
+
+import com.jayway.restassured.builder.RequestSpecBuilder;
+import com.jayway.restassured.builder.ResponseSpecBuilder;
+import com.jayway.restassured.http.ContentType;
+import com.jayway.restassured.specification.RequestSpecification;
+import com.jayway.restassured.specification.ResponseSpecification;
+
+@SuppressWarnings({"rawtypes", "unchecked"})
+public class VariableInstallmentsIntegrationTest {
+
+    
+    private static final String NONE = "1";
+    private RequestSpecification requestSpec;
+    private ResponseSpecification responseSpec;
+    private LoanTransactionHelper loanTransactionHelper;
+    
+    @Before
+    public void setup() {
+        Utils.initializeRESTAssured();
+        this.requestSpec = new RequestSpecBuilder().setContentType(ContentType.JSON).build();
+        this.requestSpec.header("Authorization", "Basic " + Utils.loginIntoServerAndGetBase64EncodedAuthenticationKey());
+        this.responseSpec = new ResponseSpecBuilder().expectStatusCode(200).build();
+        this.loanTransactionHelper = new LoanTransactionHelper(this.requestSpec, this.responseSpec);
+    }
+    
+    @Test
+    public void testVariableLoanProductCreation() {
+        final String json = VariableInstallmentsDecliningBalanceHelper.createLoanProductWithVaribleConfig(false, NONE);
+        final Integer loanProductID = this.loanTransactionHelper.getLoanProductId(json);
+        System.out.println("------------------------------RETRIEVING CREATED LOAN PRODUCT DETAILS ---------------------------------------");
+        Map loanProduct = (Map)loanTransactionHelper.getLoanProductDetail(requestSpec, responseSpec, loanProductID, "") ;
+        Assert.assertTrue((Boolean)loanProduct.get("allowVariableInstallments")) ;
+        Assert.assertEquals(new Integer(5), loanProduct.get("minimumGap")) ;
+        Assert.assertEquals(new Integer(90), loanProduct.get("maximumGap")) ;
+    }
+    
+   
+    @Test
+    public void testLoanProductCreation() {
+        final String  josn = VariableInstallmentsDecliningBalanceHelper.createLoanProductWithoutVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(josn);
+        System.out.println("------------------------------RETRIEVING CREATED LOAN PRODUCT DETAILS ---------------------------------------");
+        Map loanProduct = (Map)loanTransactionHelper.getLoanProductDetail(requestSpec, responseSpec, loanProductID, "") ;
+        Assert.assertTrue(!(Boolean)loanProduct.get("allowVariableInstallments")) ;
+    }
+    
+    @Test
+    public void testDeleteInstallmentsWithDecliningBalanceEqualInstallments() {
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsDecliningBalanceHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsDecliningBalanceHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        //Integer loanID = 49 ;
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        ArrayList toDelete = new ArrayList<>() ;
+        toDelete.add(periods.get(1)) ;
+        String toDeletedata = VariableInstallmentsDecliningBalanceHelper.createDeleteVariations(toDelete) ;
+        HashMap modifiedReschdule = transactionHelper.validateVariations(toDeletedata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsDecliningBalanceHelper.constructVerifyData(new String[] {"20 November 2011", "20 December 2011", "20 January 2012"}, 
+                new String[] {"34675.47", "34675.47", "36756.26"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(toDeletedata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+        
+    }
+    private void assertAfterSubmit(ArrayList<Map> serverData, ArrayList<Map> expectedData) {
+        Assert.assertTrue(serverData.size() == expectedData.size()) ;
+        for(int i = 0 ; i < serverData.size(); i++) {
+            Map<String, Object> serverMap = serverData.get(i) ;
+            Map<String, Object> expectedMap = expectedData.get(i) ;
+            Assert.assertTrue(VariableInstallmentsDecliningBalanceHelper.formatDate((ArrayList)serverMap.get("dueDate")).equals(expectedMap.get("dueDate"))) ;
+            Assert.assertTrue(serverMap.get("totalOutstandingForPeriod").toString().equals(expectedMap.get("installmentAmount"))) ;
+        }
+    }
+    
+    @Test
+    public void testAddInstallmentsWithDecliningBalanceEqualInstallments() {
+        //31 October 2011 - 5000
+        //Result: 20 October 2011 - 21,215.84, 31 October 2011 - 5000, 20 November 2011 26,477.31, 20 December 2011 26,477.31, 20 January 2012 25,947.7
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsDecliningBalanceHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsDecliningBalanceHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+       // Integer loanID = 57 ;
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        String addVariationsjsondata = VariableInstallmentsDecliningBalanceHelper.createAddVariations() ;
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsDecliningBalanceHelper.constructVerifyData(new String[] {"20 October 2011", "31 October 2011", "20 November 2011", "20 December 2011", "20 January 2012"}, 
+                new String[] {"21215.84", "5000.0", "26477.31", "26477.31", "25947.7"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+    
+    @Test
+    public void testModifyInstallmentWithDecliningBalanceEqualInstallments() {
+        //20 October 2011 - 30000 modify
+        //Result 20 October 2011 - 30000.0, 20 November 2011 - 24,966.34, 20 December 2011 - 24,966.34, 20 January 2012 - 24,966.33
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsDecliningBalanceHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsDecliningBalanceHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        //Integer loanID = 57 ;
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        String addVariationsjsondata = VariableInstallmentsDecliningBalanceHelper.createModifiyVariations((Map)periods.get(1)) ; //0th position will have disbursement 
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsDecliningBalanceHelper.constructVerifyData(new String[] {"20 October 2011", "20 November 2011", "20 December 2011", "20 January 2012"}, 
+                new String[] {"30000.0", "24966.34", "24966.34", "24966.33"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+        
+    }
+    
+    @Test
+    public void testAllVariationsDecliningBalancewithEqualInstallments() {
+         // Request: Delete 20 December 2011 26,262.38, Modify 20 November 2011 from 26,262.38 to 30000, Add 25 December 2011 5000
+         // Result: 20 October 2011 - 26262.38, 20 November 2011 - 30000, 25 December 2011 - 5000, 20 January 2012 - 44077  
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsDecliningBalanceHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsDecliningBalanceHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        //Integer loanID = 57 ;
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        
+        String addVariationsjsondata = VariableInstallmentsDecliningBalanceHelper.createAllVariations() ; //0th position will have disbursement 
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsDecliningBalanceHelper.constructVerifyData(new String[] {"20 October 2011", "20 November 2011", "25 December 2011", "20 January 2012"}, 
+                new String[] {"26262.38", "30000.0", "5000.0", "44077.0"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+    
+    @Test
+    public void testAllVariationsDecliningBalancewithEqualPrincipal() {
+         // Request: Delete 20 December 2011 26,262.38, Modify 20 November 2011 from 26,262.38 to 30000, Add 25 December 2011 5000
+         // Result: 20 October 2011 - 27000.0, 20 November 2011 - 31500.0, 25 December 2011 - 6045.16, 20 January 2012 - 40670.97  
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsDecliningBalanceHelper.createLoanProductWithVaribleConfigwithEqualPrincipal(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsDecliningBalanceHelper.applyForLoanApplicationWithEqualPrincipal(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+       // Integer loanID = 109 ;
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        
+        String addVariationsjsondata = VariableInstallmentsDecliningBalanceHelper.createAllVariationsWithEqualPrincipal() ; //0th position will have disbursement 
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsDecliningBalanceHelper.constructVerifyData(new String[] {"20 October 2011", "20 November 2011", "25 December 2011", "20 January 2012"}, 
+                new String[] {"27000.0", "31500.0", "6045.16", "40670.97"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+    
+    @Test
+    public void testModifyDatesWithDecliningBalanceEqualInstallments() {
+        //Modify 20 December 2011:25000 -> 04 January 2012:20000
+        //Modify 20 January 2012 -> 08 February 2012
+        //Result 20 October 2011 -26262.38, 20 November 2011 - 26262.38, 04 January 2012 -20000, 08 February 2012 - 33242.97
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsDecliningBalanceHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsDecliningBalanceHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        //Integer loanID = 57 ;
+        
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        //
+        //
+        String addVariationsjsondata = VariableInstallmentsDecliningBalanceHelper.createModifiyDateVariations(new String[]{"20 December 2011", "20 January 2012"}, new String[]{"04 January 2012", "08 February 2012"}, new String[]{"20000"}) ; //0th position will have disbursement 
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsDecliningBalanceHelper.constructVerifyData(new String[] {"20 October 2011", "20 November 2011", "04 January 2012", "08 February 2012"}, 
+                new String[] {"26262.38", "26262.38", "20000.0", "33242.97"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;   
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+    
+    // Interest Type is FLAT
+    @Test
+    public void testDeleteInstallmentsWithInterestTypeFlat() {
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsFlatHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsFlatHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        ArrayList toDelete = new ArrayList<>() ;
+        toDelete.add(periods.get(1)) ;
+        String toDeletedata = VariableInstallmentsFlatHelper.createDeleteVariations(toDelete) ;
+        HashMap modifiedReschdule = transactionHelper.validateVariations(toDeletedata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsFlatHelper.constructVerifyData(new String[] {"20 November 2011", "20 December 2011", "20 January 2012"}, 
+                new String[] {"36000.0", "36000.0", "36000.0"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(toDeletedata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+    
+    @Test
+    public void testAddInstallmentsWithInterestTypeFlat() {
+        //31 October 2011 - 5000
+        //Result: 20 October 2011 - 21600.0, 31 October 2011 - 6600.0, 20 November 2011 26600.0, 20 December 2011 26600.0, 20 January 2012 26600.0
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsFlatHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsFlatHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        //Integer loanID = 67 ;
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        String addVariationsjsondata = VariableInstallmentsFlatHelper.createAddVariations() ;
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsFlatHelper.constructVerifyData(new String[] {"20 October 2011", "31 October 2011", "20 November 2011", "20 December 2011", "20 January 2012"}, 
+                new String[] {"21600.0", "6600.0", "26600.0", "26600.0", "26600.0"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+    
+    @Test
+    public void testModifyInstallmentsWithInterestTypeisFlat() {
+        //20 October 2011 - 30000 modify
+        //Result 20 October 2011 - 32000.0, 20 November 2011 - 25333.33, 20 December 2011 - 25333.33, 20 January 2012 - 25333.34
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsFlatHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsFlatHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        //Integer loanID = 67 ;
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        String addVariationsjsondata = VariableInstallmentsFlatHelper.createModifiyVariations((Map)periods.get(1)) ; //0th position will have disbursement 
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsFlatHelper.constructVerifyData(new String[] {"20 October 2011", "20 November 2011", "20 December 2011", "20 January 2012"}, 
+                new String[] {"32000.0", "25333.33", "25333.33", "25333.34"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+    
+    @Test
+    public void testAllVariationsWithInterestTypeFlat() {
+         // Request: Delete 20 December 2011 25000.0, Modify 20 November 2011 from 25,000 to 30000, Add 25 December 2011 5000
+         // Result: 20 October 2011 - 27000.0, 20 November 2011 - 32000.0, 25 December 2011 - 7000.0, 20 January 2012 - 42000.0  
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsFlatHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsFlatHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        //Integer loanID = 67 ;
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        
+        String addVariationsjsondata = VariableInstallmentsFlatHelper.createAllVariations() ; //0th position will have disbursement 
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsFlatHelper.constructVerifyData(new String[] {"20 October 2011", "20 November 2011", "25 December 2011", "20 January 2012"}, 
+                new String[] {"27000.0", "32000.0", "7000.0", "42000.0"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+    
+    @Test
+    public void testModifyDatesWithInterestTypeFlat() {
+        //Modify 20 December 2011:25000 -> 04 January 2012:20000
+        //Modify 20 January 2012 -> 08 February 2012
+        //Result 20 October 2011 -27306.45, 20 November 2011 - 27306.45, 04 January 2012 -22306.45, 08 February 2012 - 32306.46
+        VariableIntallmentsTransactionHelper transactionHelper = new VariableIntallmentsTransactionHelper(requestSpec, responseSpec) ;
+        final String  loanProductJson = VariableInstallmentsFlatHelper.createLoanProductWithVaribleConfig(false, NONE);
+        Integer loanProductID = this.loanTransactionHelper.getLoanProductId(loanProductJson);
+        final Integer clientID = ClientHelper.createClient(this.requestSpec, this.responseSpec);
+        ClientHelper.verifyClientCreatedOnServer(this.requestSpec, this.responseSpec, clientID);
+        final String json = VariableInstallmentsFlatHelper.applyForLoanApplication(clientID, loanProductID, null, null, "1,00,000.00");
+        final Integer loanID = this.loanTransactionHelper.getLoanId(json);
+        HashMap loanStatusHashMap = LoanStatusChecker.getStatusOfLoan(this.requestSpec, this.responseSpec, loanID);
+        LoanStatusChecker.verifyLoanIsPending(loanStatusHashMap);
+        //Integer loanID = 67 ;
+        
+        Map list = transactionHelper.retrieveSchedule(loanID) ;
+        Map repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        ArrayList periods = (ArrayList)repaymentSchedule.get("periods") ;
+        //
+        //
+        String addVariationsjsondata = VariableInstallmentsFlatHelper.createModifiyDateVariations(new String[]{"20 December 2011", "20 January 2012"}, new String[]{"04 January 2012", "08 February 2012"}, new String[]{"20000"}) ; //0th position will have disbursement 
+        HashMap modifiedReschdule = transactionHelper.validateVariations(addVariationsjsondata, loanID) ;
+        ArrayList newperiods = (ArrayList) modifiedReschdule.get("periods") ;
+        ArrayList toVerifyData = VariableInstallmentsFlatHelper.constructVerifyData(new String[] {"20 October 2011", "20 November 2011", "04 January 2012", "08 February 2012"}, 
+                new String[] {"27306.45", "27306.45", "22306.45", "32306.46"}) ;
+        assertAfterSubmit(newperiods, toVerifyData) ;   
+        transactionHelper.submitVariations(addVariationsjsondata, loanID) ;
+        list = transactionHelper.retrieveSchedule(loanID) ;
+        repaymentSchedule = (Map)list.get("repaymentSchedule") ;
+        periods = (ArrayList)repaymentSchedule.get("periods") ;
+        periods.remove(0) ; //Repayments Schedule includes disbursement also. So remove this.
+        assertAfterSubmit(periods, toVerifyData) ;
+    }
+}

mifosng-provider/src/integrationTest/java/org/mifosplatform/integrationtests/variableinstallments/VariableIntallmentsTransactionHelper.java

@@ -0,0 +1,46 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.mifosplatform.integrationtests.variableinstallments;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.mifosplatform.integrationtests.common.Utils;
+
+import com.jayway.restassured.specification.RequestSpecification;
+import com.jayway.restassured.specification.ResponseSpecification;
+
+
+@SuppressWarnings("rawtypes")
+public class VariableIntallmentsTransactionHelper {
+
+    private final String URL = "https://localhost:8443/mifosng-provider/api/v1/loans/" ;
+    
+    private final RequestSpecification requestSpec;
+    private final ResponseSpecification responseSpec;
+    
+    public VariableIntallmentsTransactionHelper(final RequestSpecification requestSpec, 
+            final ResponseSpecification responseSpec) {
+        this.requestSpec = requestSpec ;
+        this.responseSpec = responseSpec ;
+    }
+    
+    
+    public Map retrieveSchedule(Integer loanId) {
+        String url = URL+loanId+"?associations=repaymentSchedule&exclude=guarantors&"+Utils.TENANT_IDENTIFIER ;
+        return Utils.performServerGet(requestSpec, responseSpec, url, "");
+    }
+    
+    public HashMap validateVariations(final String exceptions, Integer loanId) {
+        String url = URL+loanId+"/schedule?command=calculateLoanSchedule&"+Utils.TENANT_IDENTIFIER ;
+        return Utils.performServerPost(this.requestSpec, this.responseSpec, url, exceptions, "");
+    }
+    
+    public HashMap submitVariations(final String exceptions, Integer loanId) {
+        String url = URL+loanId+"/schedule?command=addVariations&"+Utils.TENANT_IDENTIFIER ;
+        return Utils.performServerPost(this.requestSpec, this.responseSpec, url, exceptions, "");
+    }
+}