android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/AppointmentDetailFragment.java

@@ -37,6 +37,7 @@ public class AppointmentDetailFragment extends Fragment {
 
     private long appointmentId = -1;
     private boolean isEditing = false;
+    private boolean isPastAppointment = false;
     private long preselectedPetId = -1;
     private long preselectedServiceId = -1;
     private long preselectedCustomerId = -1;
@@ -161,6 +162,7 @@ public class AppointmentDetailFragment extends Fragment {
      */
     private void setupDatePicker() {
         binding.etAppointmentDate.setOnClickListener(v -> {
+            if (isPastAppointment) return;
             Calendar c = Calendar.getInstance();
             DatePickerDialog d = new DatePickerDialog(requireContext(),
                     (dp,y,m,d1) -> binding.etAppointmentDate.setText(
@@ -376,6 +378,8 @@ public class AppointmentDetailFragment extends Fragment {
                     SpinnerUtils.setSelectionByValue(binding.spinnerAppointmentStatus, formattedStatus);
                 }
 
+                checkIfPastAndDisable(a.getAppointmentDate(), time);
+
                 refreshPetSpinner();
                 refreshServiceSpinner();
                 refreshCustomerSpinner();
@@ -387,6 +391,92 @@ public class AppointmentDetailFragment extends Fragment {
         });
     }
 
+    /**
+     * Checks if the appointment is in the past and disables fields.
+     */
+    private void checkIfPastAndDisable(String date, String time) {
+        if (date == null || time == null) return;
+        try {
+            Calendar selected = Calendar.getInstance();
+            String[] dateParts = date.split("-");
+            String[] timeParts = time.split(":");
+            selected.set(
+                    Integer.parseInt(dateParts[0]),
+                    Integer.parseInt(dateParts[1]) - 1,
+                    Integer.parseInt(dateParts[2]),
+                    Integer.parseInt(timeParts[0]),
+                    Integer.parseInt(timeParts[1]),
+                    0
+            );
+
+            Object selectedItem = binding.spinnerAppointmentStatus.getSelectedItem();
+            String currentStatus = selectedItem != null ? selectedItem.toString() : "";
+
+            // If the appointment is already Cancelled, disable all fields
+            if ("Cancelled".equalsIgnoreCase(currentStatus)) {
+                isPastAppointment = true;
+                disableAllExceptStatus();
+                binding.spinnerAppointmentStatus.setEnabled(false);
+                binding.spinnerAppointmentStatus.setAlpha(0.5f);
+                binding.btnSaveAppointment.setVisibility(View.GONE);
+                return;
+            }
+
+            // If the appointment date/time is in the past
+            if (selected.before(Calendar.getInstance())) {
+                isPastAppointment = true;
+                disableAllExceptStatus();
+
+                // Make status spinner only have Completed or Missed
+                SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerAppointmentStatus,
+                        new String[]{"Completed", "Missed"});
+
+                // Restore selection if it's already one of the valid options
+                if (currentStatus.equals("Completed") || currentStatus.equals("Missed")) {
+                    SpinnerUtils.setSelectionByValue(binding.spinnerAppointmentStatus, currentStatus);
+                }
+            }
+        } catch (Exception e) {
+            Log.e("APPT_DETAIL", "Error parsing date/time for past check: " + e.getMessage());
+        }
+    }
+
+    /**
+     * Disables all input fields except the status spinner
+     */
+    private void disableAllExceptStatus() {
+        binding.spinnerCustomer.setEnabled(false);
+        binding.spinnerStore.setEnabled(false);
+        binding.spinnerPet.setEnabled(false);
+        binding.spinnerService.setEnabled(false);
+        binding.spinnerStaff.setEnabled(false);
+        binding.etAppointmentDate.setEnabled(false);
+        binding.spinnerHour.setEnabled(false);
+        binding.spinnerMinute.setEnabled(false);
+
+        float disabledAlpha = 0.5f;
+        binding.spinnerCustomer.setAlpha(disabledAlpha);
+        binding.spinnerStore.setAlpha(disabledAlpha);
+        binding.spinnerPet.setAlpha(disabledAlpha);
+        binding.spinnerService.setAlpha(disabledAlpha);
+        binding.spinnerStaff.setAlpha(disabledAlpha);
+        binding.etAppointmentDate.setAlpha(disabledAlpha);
+        binding.spinnerHour.setAlpha(disabledAlpha);
+        binding.spinnerMinute.setAlpha(disabledAlpha);
+
+        binding.tvLabelCustomer.setAlpha(disabledAlpha);
+        binding.tvLabelStore.setAlpha(disabledAlpha);
+        binding.tvLabelPet.setAlpha(disabledAlpha);
+        binding.tvLabelService.setAlpha(disabledAlpha);
+        binding.tvLabelStaff.setAlpha(disabledAlpha);
+        binding.tvLabelDate.setAlpha(disabledAlpha);
+        binding.tvLabelTime.setAlpha(disabledAlpha);
+
+        // Keep status enabled
+        binding.spinnerAppointmentStatus.setEnabled(true);
+        binding.spinnerAppointmentStatus.setAlpha(1.0f);
+    }
+
     /**
      * Validates input and saves the appointment to the backend.
      */

android/app/src/main/res/layout/fragment_appointment_detail.xml

@@ -136,6 +136,7 @@
 
                 <!-- Staff -->
                 <TextView
+                    android:id="@+id/tvLabelStaff"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:text="Staff"
@@ -152,6 +153,7 @@
                 <!-- Appointment Date -->
 
                 <TextView
+                    android:id="@+id/tvLabelDate"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:text="Appointment Date"
@@ -172,6 +174,7 @@
 
                 <!-- Appointment Time-->
                 <TextView
+                    android:id="@+id/tvLabelTime"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:text="Appointment Time"

backend/src/main/java/com/petshop/backend/BackendApplication.java

@@ -4,8 +4,10 @@ import com.petshop.backend.config.FlywayContextInitializer;
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.data.web.config.EnableSpringDataWebSupport;
+import org.springframework.scheduling.annotation.EnableScheduling;
 
 @SpringBootApplication
+@EnableScheduling
 @EnableSpringDataWebSupport(pageSerializationMode = EnableSpringDataWebSupport.PageSerializationMode.VIA_DTO)
 public class BackendApplication {
     public static void main(String[] args) {

backend/src/main/java/com/petshop/backend/config/ApplicationStartupListener.java

@@ -0,0 +1,22 @@
+package com.petshop.backend.config;
+
+import com.petshop.backend.service.AppointmentService;
+import org.springframework.context.ApplicationListener;
+import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ApplicationStartupListener implements ApplicationListener<ContextRefreshedEvent> {
+
+    private final AppointmentService appointmentService;
+
+    public ApplicationStartupListener(AppointmentService appointmentService) {
+        this.appointmentService = appointmentService;
+    }
+
+    @Override
+    public void onApplicationEvent(ContextRefreshedEvent event) {
+        //update booked appointments to complete on startup
+        appointmentService.updatePastAppointmentsStatus();
+    }
+}

backend/src/main/java/com/petshop/backend/repository/AppointmentRepository.java

@@ -47,4 +47,7 @@ public interface AppointmentRepository extends JpaRepository<Appointment, Long>
 
     @Query("SELECT a FROM Appointment a JOIN FETCH a.service WHERE a.employee.id IN :employeeIds AND a.appointmentDate = :date AND LOWER(a.appointmentStatus) NOT IN ('cancelled', 'missed')")
     List<Appointment> findByEmployeeIdInAndAppointmentDate(@Param("employeeIds") List<Long> employeeIds, @Param("date") LocalDate date);
+
+    @Query("SELECT a FROM Appointment a WHERE (a.appointmentDate < :currentDate OR (a.appointmentDate = :currentDate AND a.appointmentTime < :currentTime)) AND LOWER(a.appointmentStatus) = 'booked'")
+    List<Appointment> findPastBookedAppointments(@Param("currentDate") LocalDate currentDate, @Param("currentTime") LocalTime currentTime);
 }

backend/src/main/java/com/petshop/backend/service/AppointmentService.java

@@ -16,6 +16,7 @@ import com.petshop.backend.repository.UserRepository;
 import com.petshop.backend.util.AuthenticationHelper;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
+import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.security.access.AccessDeniedException;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -209,6 +210,20 @@ public class AppointmentService {
         return availableSlots;
     }
 
+    //Update booked status to completed at every midnight
+    @Scheduled(cron = "0 0 0 * * ?")
+    @Transactional
+    public void updatePastAppointmentsStatus() {
+        LocalDate currentDate = LocalDate.now();
+        LocalTime currentTime = LocalTime.now();
+        List<Appointment> pastBookedAppointments = appointmentRepository.findPastBookedAppointments(currentDate, currentTime);
+
+        for (Appointment appointment : pastBookedAppointments) {
+            appointment.setAppointmentStatus("COMPLETED");
+            appointmentRepository.save(appointment);
+        }
+    }
+
     private String normalizeFilter(String value) {
         if (value == null) {
             return null;