src/main/java/com/primefactorsolutions/service/VacationService.java

@@ -11,7 +11,7 @@ import org.springframework.stereotype.Service;
 public class VacationService {
     private final VacationRepository vacationRepository;
 
-    public Vacation findVacation(final TimeOffRequestType category) {
+    public Vacation findVacationByCategory(final TimeOffRequestType category) {
         return vacationRepository.findByCategory(category);
     }
 

src/main/java/com/primefactorsolutions/views/RequestRegisterView.java

@@ -3,6 +3,7 @@ package com.primefactorsolutions.views;
 import com.primefactorsolutions.model.*;
 import com.primefactorsolutions.service.EmployeeService;
 import com.primefactorsolutions.service.TimeOffRequestService;
+import com.primefactorsolutions.service.VacationService;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.combobox.ComboBox;
 import com.vaadin.flow.component.datepicker.DatePicker;
@@ -17,6 +18,7 @@ import com.vaadin.flow.spring.annotation.SpringComponent;
 import jakarta.annotation.security.PermitAll;
 import org.springframework.context.annotation.Scope;
 
+import java.time.LocalDate;
 import java.util.List;
 
 @SpringComponent
@@ -36,15 +38,20 @@ public class RequestRegisterView extends VerticalLayout {
 
     private final TimeOffRequestService requestService;
     private final EmployeeService employeeService;
+    private final VacationService vacationService;
+
     private final Binder<TimeOffRequest> binder;
+    private LocalDate endDate;
 
     private Button saveButton;
     private Button closeButton;
 
     public RequestRegisterView(final TimeOffRequestService requestService,
-                               final EmployeeService employeeService) {
+                               final EmployeeService employeeService,
+                               final VacationService vacationService) {
         this.requestService = requestService;
         this.employeeService = employeeService;
+        this.vacationService = vacationService;
         this.binder = new Binder<>(TimeOffRequest.class);
 
         configureFormFields();
@@ -58,6 +65,71 @@ public class RequestRegisterView extends VerticalLayout {
         employeeComboBox.setItems(employees);
         employeeComboBox.setItemLabelGenerator(emp -> emp.getFirstName() + " " + emp.getLastName());
         categoryComboBox.setItems(TimeOffRequestType.values());
+        categoryComboBox.addValueChangeListener(event -> updateAvailableDays(event.getValue()));
+        startDatePicker.addValueChangeListener(event -> updateDatePickerMinValues());
+        endDatePicker.addValueChangeListener(event -> calculateDays());
+        availableDaysField.setReadOnly(true);
+        daysToBeTakenField.setReadOnly(true);
+        balanceDaysField.setReadOnly(true);
+    }
+
+    private void updateAvailableDays(TimeOffRequestType selectedCategory) {
+        if (selectedCategory != null) {
+            Vacation vacation = vacationService.findVacationByCategory(selectedCategory);
+            if (vacation != null) {
+                availableDaysField.setValue(vacation.getDuration());
+                setDatePickerLimits(vacation);
+            }
+        }
+    }
+
+    private void setDatePickerLimits(Vacation vacation) {
+        LocalDate startDate = vacation.getVacationDate();
+        endDate = startDate.plusDays(vacation.getExpiration().intValue() - 1);
+        startDatePicker.setMin(startDate);
+        startDatePicker.setMax(endDate);
+        endDatePicker.setMin(startDate);
+        endDatePicker.setMax(endDate);
+
+        startDatePicker.clear();
+        endDatePicker.clear();
+        getUI().ifPresent(ui -> ui.access(() -> {
+            startDatePicker.setInitialPosition(startDate);
+        }));
+    }
+
+    private void updateDatePickerMinValues() {
+        LocalDate startDate = startDatePicker.getValue();
+        if (startDate != null) {
+            endDatePicker.setMin(startDate);
+            endDatePicker.setInitialPosition(startDate);
+            calculateDays();
+        }
+    }
+
+    private void calculateDays() {
+        LocalDate startDate = startDatePicker.getValue();
+        LocalDate endDate = endDatePicker.getValue();
+        Double availableDays = availableDaysField.getValue();
+
+        if (startDate != null && endDate != null) {
+            if (startDate.isAfter(endDate)) {
+                endDatePicker.clear();
+                return;
+            }
+
+            long daysToBeTaken = java.time.temporal.ChronoUnit.DAYS.between(startDate, endDate) + 1;
+            daysToBeTakenField.setValue((double) daysToBeTaken);
+
+            double balanceDays = availableDays - daysToBeTaken;
+            if (balanceDays < 0) {
+                endDatePicker.clear();
+                daysToBeTakenField.clear();
+                balanceDaysField.clear();
+            } else {
+                balanceDaysField.setValue(balanceDays);
+            }
+        }
     }
 
     private void configureButtons() {
@@ -74,6 +146,9 @@ public class RequestRegisterView extends VerticalLayout {
                 .asRequired("Category is required")
                 .bind(TimeOffRequest::getCategory, TimeOffRequest::setCategory);
 
+        binder.forField(availableDaysField)
+                .bind(TimeOffRequest::getAvailableDays, TimeOffRequest::setAvailableDays);
+
         binder.forField(startDatePicker)
                 .asRequired("Start date is required")
                 .bind(TimeOffRequest::getStartDate, TimeOffRequest::setStartDate);
@@ -83,11 +158,9 @@ public class RequestRegisterView extends VerticalLayout {
                 .bind(TimeOffRequest::getEndDate, TimeOffRequest::setEndDate);
 
         binder.forField(daysToBeTakenField)
-                .asRequired("Days to be taken is required")
                 .bind(TimeOffRequest::getDaysToBeTake, TimeOffRequest::setDaysToBeTake);
 
         binder.forField(balanceDaysField)
-                .asRequired("Balance days is required")
                 .bind(TimeOffRequest::getDaysBalance, TimeOffRequest::setDaysBalance);
 
         binder.setBean(new TimeOffRequest());
@@ -98,9 +171,9 @@ public class RequestRegisterView extends VerticalLayout {
                 new H3("Add Vacation Request"),
                 employeeComboBox,
                 categoryComboBox,
+                availableDaysField,
                 startDatePicker,
                 endDatePicker,
-                availableDaysField,
                 daysToBeTakenField,
                 balanceDaysField,
                 new HorizontalLayout(saveButton, closeButton)
@@ -110,6 +183,8 @@ public class RequestRegisterView extends VerticalLayout {
     private void saveRequest() {
         if (binder.validate().isOk()) {
             TimeOffRequest request = binder.getBean();
+            request.setExpiration(endDate);
+            request.setState(TimeOffRequestStatus.REQUESTED);
             requestService.saveTimeOffRequest(request);
             Notification.show("Request saved successfully.");
             closeForm();

src/main/resources/data.sql

@@ -16,13 +16,13 @@ INSERT INTO team (id, version, name) VALUES ('c3a8a7b1-f2d9-48c0-86ea-f215c2e6b3
 INSERT INTO team (id, version, name) VALUES ('8f6b61e7-efb2-4de7-b8ed-7438c9d8babe', 1, 'GHI');
 
 
-INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('123e4567-e89b-12d3-a456-426614174000', 1, 'NEW_YEAR', '2024-01-01', 1, 0, 'FIXED');
+INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('123e4567-e89b-12d3-a456-426614174000', 1, 'NEW_YEAR', '2024-01-01', 1, 1, 'FIXED');
-INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('223e4567-e89b-12d3-a456-426614174001', 1, 'MONDAY_CARNIVAL', '2024-02-12', 1, 0, 'FIXED');
+INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('223e4567-e89b-12d3-a456-426614174001', 1, 'MONDAY_CARNIVAL', '2024-02-12', 1, 1, 'FIXED');
-INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('323e4567-e89b-12d3-a456-426614174002', 1, 'TUESDAY_CARNIVAL', '2024-02-13', 1, 0, 'FIXED');
+INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('323e4567-e89b-12d3-a456-426614174002', 1, 'TUESDAY_CARNIVAL', '2024-02-13', 1, 1, 'FIXED');
-INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('423e4567-e89b-12d3-a456-426614174003', 1, 'GOOD_FRIDAY', '2024-03-29', 1, 0, 'FIXED');
+INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('423e4567-e89b-12d3-a456-426614174003', 1, 'GOOD_FRIDAY', '2024-03-29', 1, 1, 'FIXED');
-INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('523e4567-e89b-12d3-a456-426614174004', 1, 'LABOR_DAY', '2024-05-01', 1, 0, 'FIXED');
+INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('523e4567-e89b-12d3-a456-426614174004', 1, 'LABOR_DAY', '2024-05-01', 1, 1, 'FIXED');
-INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('623e4567-e89b-12d3-a456-426614174005', 1, 'INDEPENDENCE_DAY', '2024-08-06', 1, 0, 'FIXED');
+INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('623e4567-e89b-12d3-a456-426614174005', 1, 'INDEPENDENCE_DAY', '2024-08-06', 1, 1, 'FIXED');
-INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('723e4567-e89b-12d3-a456-426614174006', 1, 'CHRISTMAS', '2024-12-25', 1, 0, 'FIXED');
+INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('723e4567-e89b-12d3-a456-426614174006', 1, 'CHRISTMAS', '2024-12-25', 1, 1, 'FIXED');
 
 
 INSERT INTO vacation (id, version, category, vacation_date, duration, expiration, type) VALUES ('823e4567-e89b-12d3-a456-426614174007', 1, 'PRURINATIONAL_STATE_DAY', '2024-01-21', 1, 30, 'MOVABLE');