AAE-46517 Add onRowCountChange form event for Repeatable Sections (#12062)

* AAE-46517 Add onRowCountChange event for Repeatable Sections

* code review fixes for unit test

lib/core/src/lib/form/components/widgets/core/form-field.model.spec.ts

@@ -16,6 +16,8 @@
  */
 
 import { DateFnsUtils } from '../../../../common';
+import { FormRulesEvent } from '../../../events/form-rules.event';
+import { firstValueFrom, map, Subject, take, timeout } from 'rxjs';
 import { FormFieldTypes } from './form-field-types';
 import { RequiredFieldValidator } from './form-field-validator';
 import { FormFieldModel } from './form-field.model';
@@ -1541,6 +1543,17 @@ describe('FormFieldModel', () => {
         });
 
         describe('add row', () => {
+            const assignFormRulesEventSubject = (): Subject<FormRulesEvent> => {
+                const formRulesEvent = new Subject<FormRulesEvent>();
+                (field.form as any).formService = {
+                    formRulesEvent,
+                    validateForm: new Subject(),
+                    validateFormField: new Subject(),
+                    formFieldValueChanged: new Subject()
+                };
+                return formRulesEvent;
+            };
+
             it('should add row if allowed by limit param', () => {
                 expect(field.rows.length).toBe(2);
 
@@ -1568,18 +1581,56 @@ describe('FormFieldModel', () => {
                 expect(field.rows.length).toBe(5);
             });
 
-            it('should call onRepeatableSectionChanged', () => {
-                spyOn(field.form, 'onRepeatableSectionChanged').and.callThrough();
+            it('should call onRepeatableSectionRowCountChanged', () => {
+                spyOn(field.form, 'onRepeatableSectionRowCountChanged').and.callThrough();
 
-                expect(field.form.onRepeatableSectionChanged).not.toHaveBeenCalled();
+                expect(field.form.onRepeatableSectionRowCountChanged).not.toHaveBeenCalled();
 
                 field.addRow(field.fields, form);
 
-                expect(field.form.onRepeatableSectionChanged).toHaveBeenCalled();
+                expect(field.form.onRepeatableSectionRowCountChanged).toHaveBeenCalledWith(field);
+            });
+
+            it('should emit onRowCountChanged via formService.formRulesEvent', async () => {
+                const formRulesEvent = assignFormRulesEventSubject();
+                const emissionPromise = firstValueFrom(formRulesEvent);
+
+                field.addRow(field.fields, form);
+
+                const emittedEvent = await emissionPromise;
+                expect(emittedEvent.type).toBe('onRowCountChanged');
+                expect(emittedEvent.field).toBe(field);
+            });
+
+            it('should NOT emit onRowCountChanged when add row is not allowed', async () => {
+                const formRulesEvent = assignFormRulesEventSubject();
+
+                field.addRow(field.fields, form);
+                field.addRow(field.fields, form);
+                field.addRow(field.fields, form);
+                expect(field.rows.length).toBe(5);
+
+                const emissionPromise = firstValueFrom(formRulesEvent.pipe(timeout(50)));
+
+                field.addRow(field.fields, form);
+
+                await expectAsync(emissionPromise).toBeRejected();
+                expect(field.rows.length).toBe(5);
             });
         });
 
         describe('remove row', () => {
+            const assignFormRulesEventSubject = (): Subject<FormRulesEvent> => {
+                const formRulesEvent = new Subject<FormRulesEvent>();
+                (field.form as any).formService = {
+                    formRulesEvent,
+                    validateForm: new Subject(),
+                    validateFormField: new Subject(),
+                    formFieldValueChanged: new Subject()
+                };
+                return formRulesEvent;
+            };
+
             it('should remove row if target index exists', () => {
                 expect(field.rows.length).toBe(2);
 
@@ -1646,14 +1697,77 @@ describe('FormFieldModel', () => {
                 expect(field.form.onFormFieldChanged).not.toHaveBeenCalled();
             });
 
-            it('should call onRepeatableSectionChanged', () => {
-                spyOn(field.form, 'onRepeatableSectionChanged').and.callThrough();
+            it('should call onRepeatableSectionRowCountChanged', () => {
+                spyOn(field.form, 'onRepeatableSectionRowCountChanged').and.callThrough();
 
-                expect(field.form.onRepeatableSectionChanged).not.toHaveBeenCalled();
+                expect(field.form.onRepeatableSectionRowCountChanged).not.toHaveBeenCalled();
 
                 field.removeRow(1);
 
-                expect(field.form.onRepeatableSectionChanged).toHaveBeenCalled();
+                expect(field.form.onRepeatableSectionRowCountChanged).toHaveBeenCalledWith(field);
+            });
+
+            it('should emit onRowCountChanged via formService.formRulesEvent', async () => {
+                const formRulesEvent = assignFormRulesEventSubject();
+                const emissionPromise = firstValueFrom(formRulesEvent);
+
+                field.removeRow(1);
+
+                const emittedEvent = await emissionPromise;
+                expect(emittedEvent.type).toBe('onRowCountChanged');
+                expect(emittedEvent.field).toBe(field);
+            });
+
+            it('should update form values before emitting onRowCountChanged', async () => {
+                const formRulesEvent = assignFormRulesEventSubject();
+                form.values[field.id] = [
+                    {
+                        Text0wwp7n: 'mock-1',
+                        Integer0rzkwq: 1
+                    },
+                    {
+                        Text0wwp7n: 'mock-2',
+                        Integer0rzkwq: 2
+                    }
+                ];
+
+                const valuesLengthAtEmissionPromise = firstValueFrom(
+                    formRulesEvent.pipe(
+                        take(1),
+                        map(() => form.values[field.id].length)
+                    )
+                );
+
+                field.removeRow(1);
+
+                const valuesLengthAtEmission = await valuesLengthAtEmissionPromise;
+                expect(valuesLengthAtEmission).toBe(1);
+                expect(form.values[field.id]).toEqual([
+                    {
+                        Text0wwp7n: 'mock-1',
+                        Integer0rzkwq: 1
+                    }
+                ]);
+            });
+
+            it('should emit onRowCountChanged even when form values do not contain section id', async () => {
+                const formRulesEvent = assignFormRulesEventSubject();
+                form.values = {};
+                const emissionPromise = firstValueFrom(formRulesEvent);
+
+                field.removeRow(1);
+
+                const emittedEvent = await emissionPromise;
+                expect(emittedEvent.type).toBe('onRowCountChanged');
+            });
+
+            it('should NOT emit onRowCountChanged when remove row target index does not exist', async () => {
+                const formRulesEvent = assignFormRulesEventSubject();
+                const emissionPromise = firstValueFrom(formRulesEvent.pipe(timeout(50)));
+
+                field.removeRow(2);
+
+                await expectAsync(emissionPromise).toBeRejected();
             });
         });
 

lib/core/src/lib/form/components/widgets/core/form-field.model.ts

@@ -470,7 +470,7 @@ export class FormFieldModel extends FormWidgetModel {
         }
 
         this.rows.push(this.createRow(fields, form, this.rows.length));
-        this.form.onRepeatableSectionChanged();
+        this.form.onRepeatableSectionRowCountChanged(this);
     }
 
     private shouldAddRow(): boolean {
@@ -484,14 +484,17 @@ export class FormFieldModel extends FormWidgetModel {
 
         this.rows.splice(index, 1);
         this.updateChildrenFieldsRowIndex();
-        this.form.onRepeatableSectionChanged();
 
-        if (!this.form.values[this.id]) {
-            return;
+        const hasSectionValues = !!this.form.values[this.id];
+        if (hasSectionValues) {
+            this.form.values[this.id].splice(index, 1);
         }
 
-        this.form.values[this.id].splice(index, 1);
-        this.form.onFormFieldChanged(this);
+        this.form.onRepeatableSectionRowCountChanged(this);
+
+        if (hasSectionValues) {
+            this.form.onFormFieldChanged(this);
+        }
     }
 
     private shouldRemoveRow(index: number): boolean {

lib/core/src/lib/form/components/widgets/core/form.model.ts

@@ -16,6 +16,7 @@
  */
 
 import { FormFieldEvent } from '../../../events/form-field.event';
+import { FormRulesEvent } from '../../../events/form-rules.event';
 import { ValidateFormFieldEvent } from '../../../events/validate-form-field.event';
 import { ValidateFormEvent } from '../../../events/validate-form.event';
 import { ContainerModel } from './container.model';
@@ -154,6 +155,11 @@ export class FormModel implements ProcessFormModel {
         this.fieldsCache = this.getFormFields([], true);
     }
 
+    onRepeatableSectionRowCountChanged(sectionField: FormFieldModel): void {
+        this.onRepeatableSectionChanged();
+        this.formService?.formRulesEvent?.next(new FormRulesEvent('onRowCountChanged', new FormFieldEvent(this, sectionField)));
+    }
+
     /**
      * Validates entire form and all form fields.
      */

lib/core/src/lib/form/services/form-validation-service.interface.ts

@@ -17,6 +17,7 @@
 
 import { Subject } from 'rxjs';
 import { FormFieldEvent } from '../events/form-field.event';
+import { FormRulesEvent } from '../events/form-rules.event';
 import { ValidateFormFieldEvent } from '../events/validate-form-field.event';
 import { ValidateFormEvent } from '../events/validate-form.event';
 
@@ -24,4 +25,5 @@ export interface FormValidationService {
     formFieldValueChanged: Subject<FormFieldEvent>;
     validateForm: Subject<ValidateFormEvent>;
     validateFormField: Subject<ValidateFormFieldEvent>;
+    formRulesEvent?: Subject<FormRulesEvent>;
 }