WEB-477: Re-amortization:- Preview Schedule API during re-amortization

src/app/loans/loans-view/loan-account-actions/loan-reamortize/loan-reamortize.component.html

@@ -60,6 +60,16 @@
           >
             {{ 'labels.buttons.Submit' | translate }}
           </button>
+          <button
+            type="button"
+            mat-raised-button
+            color="accent"
+            [disabled]="!reamortizeLoanForm.valid"
+            *mifosxHasPermission="'REAMORTIZE_LOAN'"
+            (click)="preview()"
+          >
+            {{ 'labels.buttons.Preview' | translate }}
+          </button>
         </mat-card-actions>
       </mat-card-content>
     </form>

src/app/loans/loans-view/loan-account-actions/loan-reamortize/loan-reamortize.component.ts

@@ -1,10 +1,14 @@
 import { Component, Input, OnInit, inject } from '@angular/core';
 import { UntypedFormBuilder, UntypedFormGroup } from '@angular/forms';
 import { ActivatedRoute, Router } from '@angular/router';
+import { MatDialog } from '@angular/material/dialog';
 import { LoansService } from 'app/loans/loans.service';
+import { RepaymentSchedule } from 'app/loans/models/loan-account.model';
 import { CodeValue } from 'app/shared/models/general.model';
 import { OptionData } from 'app/shared/models/option-data.model';
 import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
+import { SettingsService } from 'app/settings/settings.service';
+import { ReAmortizePreviewDialogComponent } from './re-amortize-preview-dialog/re-amortize-preview-dialog.component';
 
 @Component({
   selector: 'mifosx-loan-reamortize',
@@ -19,6 +23,8 @@ export class LoanReamortizeComponent implements OnInit {
   private route = inject(ActivatedRoute);
   private router = inject(Router);
   private loanService = inject(LoansService);
+  private settingsService = inject(SettingsService);
+  private dialog = inject(MatDialog);
 
   @Input() dataObject: any;
   /** Loan Id */
@@ -50,8 +56,76 @@ export class LoanReamortizeComponent implements OnInit {
     });
   }
 
-  submit(): void {
+  private prepareReAmortizeData() {
     const data = this.reamortizeLoanForm.value;
+    const locale = this.settingsService.language.code;
+    const dateFormat = this.settingsService.dateFormat;
+
+    return {
+      ...data,
+      dateFormat,
+      locale
+    };
+  }
+
+  private prepareReAmortizePreviewData() {
+    const reamortizeLoanFormData = { ...this.reamortizeLoanForm.value };
+    const locale = this.settingsService.language.code;
+    const dateFormat = this.settingsService.dateFormat;
+
+    // Prepare reAmortizationInterestHandling for preview API
+    let reAmortizationInterestHandling = reamortizeLoanFormData.reAmortizationInterestHandling;
+    if (reAmortizationInterestHandling && typeof reAmortizationInterestHandling === 'object') {
+      reAmortizationInterestHandling = reAmortizationInterestHandling.id;
+    }
+    // If no value selected, use "default" for preview
+    if (!reAmortizationInterestHandling && reAmortizationInterestHandling !== 0) {
+      reAmortizationInterestHandling = 'default';
+    }
+
+    delete reamortizeLoanFormData.reAmortizationInterestHandling;
+
+    return {
+      ...reamortizeLoanFormData,
+      reAmortizationInterestHandling: reAmortizationInterestHandling,
+      dateFormat,
+      locale
+    };
+  }
+
+  preview(): void {
+    if (this.reamortizeLoanForm.invalid) {
+      return;
+    }
+    const data = this.prepareReAmortizePreviewData();
+
+    this.loanService.getReAmortizePreview(this.loanId, data).subscribe({
+      next: (response: RepaymentSchedule) => {
+        const currencyCode = response.currency?.code;
+
+        if (!currencyCode) {
+          console.error('Currency code is not available in API response');
+          return;
+        }
+
+        this.dialog.open(ReAmortizePreviewDialogComponent, {
+          data: {
+            repaymentSchedule: response,
+            currencyCode: currencyCode
+          },
+          width: '95%',
+          maxWidth: '1400px',
+          height: '90vh'
+        });
+      },
+      error: (error) => {
+        console.error('Error loading re-amortize preview:', error);
+      }
+    });
+  }
+
+  submit(): void {
+    const data = this.prepareReAmortizeData();
     this.loanService.submitLoanActionButton(this.loanId, data, 'reAmortize').subscribe((response: any) => {
       this.router.navigate(['../../transactions'], { relativeTo: this.route });
     });

src/app/loans/loans-view/loan-account-actions/loan-reamortize/re-amortize-preview-dialog/re-amortize-preview-dialog.component.html

@@ -0,0 +1,16 @@
+<h1 mat-dialog-title>{{ 'labels.heading.Repayment Schedule Preview' | translate }}</h1>
+
+<mat-dialog-content class="mat-typography">
+  <mifosx-repayment-schedule-tab
+    [repaymentScheduleDetails]="repaymentSchedule"
+    [currencyCode]="currencyCode"
+    [forEditing]="false"
+  >
+  </mifosx-repayment-schedule-tab>
+</mat-dialog-content>
+
+<mat-dialog-actions align="end">
+  <button mat-raised-button type="button" (click)="close()">
+    {{ 'labels.buttons.Go back' | translate }}
+  </button>
+</mat-dialog-actions>

src/app/loans/loans-view/loan-account-actions/loan-reamortize/re-amortize-preview-dialog/re-amortize-preview-dialog.component.ts

@@ -0,0 +1,45 @@
+import { Component, inject, Inject } from '@angular/core';
+import {
+  MAT_DIALOG_DATA,
+  MatDialogRef,
+  MatDialogTitle,
+  MatDialogContent,
+  MatDialogActions
+} from '@angular/material/dialog';
+import { MatButton } from '@angular/material/button';
+import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
+import { RepaymentSchedule } from 'app/loans/models/loan-account.model';
+import { RepaymentScheduleTabComponent } from '../../../repayment-schedule-tab/repayment-schedule-tab.component';
+
+export interface ReAmortizePreviewDialogData {
+  repaymentSchedule: RepaymentSchedule;
+  currencyCode: string;
+}
+
+@Component({
+  selector: 'mifosx-re-amortize-preview-dialog',
+  templateUrl: './re-amortize-preview-dialog.component.html',
+  standalone: true,
+  imports: [
+    ...STANDALONE_SHARED_IMPORTS,
+    MatDialogTitle,
+    MatDialogContent,
+    MatDialogActions,
+    MatButton,
+    RepaymentScheduleTabComponent
+  ]
+})
+export class ReAmortizePreviewDialogComponent {
+  // inject() replaces constructor injection
+  private readonly dialogRef = inject<MatDialogRef<ReAmortizePreviewDialogComponent>>(MatDialogRef);
+
+  private readonly data = inject<ReAmortizePreviewDialogData>(MAT_DIALOG_DATA);
+
+  // public fields used in template
+  readonly repaymentSchedule: RepaymentSchedule = this.data.repaymentSchedule;
+  readonly currencyCode: string = this.data.currencyCode;
+
+  close(): void {
+    this.dialogRef.close();
+  }
+}

src/app/loans/loans.service.ts

@@ -258,6 +258,24 @@ export class LoansService {
     return this.http.get(`/loans/${loanId}/transactions/reage-preview`, { params: httpParams });
   }
 
+  /**
+   * Get Re-Amortize preview with repayment schedule
+   * @param loanId Loan Id
+   * @param data Re-Amortize data
+   * @returns Observable with repayment schedule preview
+   */
+  getReAmortizePreview(loanId: string, data: any): Observable<any> {
+    let httpParams = new HttpParams();
+
+    Object.keys(data).forEach((key) => {
+      if (data[key] !== null && data[key] !== undefined && data[key] !== '') {
+        httpParams = httpParams.set(key, data[key].toString());
+      }
+    });
+
+    return this.http.get(`/loans/${loanId}/transactions/reamortized-preview`, { params: httpParams });
+  }
+
   getLoanScreenReportsData(): Observable<any> {
     const httpParams = new HttpParams().set('entityId', '1').set('typeId', '0');
     return this.http.get(`/templates`, { params: httpParams });