Fixed Reviewed Changes

<User Story> Complete Payments - 1797</User Story>

<Changes>
1. Added Controller::getAllInvoices
   - Retrieves all invoices from PaymentManagementService and returns them as a read-only map.
2. Implemented Controller::confirmPayment
   - Delegates payment confirmation for a given invoice ID to PaymentManagementService.
3. Introduced PaymentManagementService::getAllInvoice
   - Provides access to all invoices stored in the datastore.
4. Added PaymentManagementService::confirmPayment
   - Confirms payment for a specific invoice, updates payment date and status, and sends notification.
5. Extended util::PaymentStatus enum
   - Added PAID status and updated string conversion.
6. Integrated AdminMenu::confirmPayment
   - Validates invoice list, filters by status, allows selection, and confirms payment.
7. Updated CustomerMenu::completePayments
   - Uses parameterized status filtering for invoice selection.
8. Enhanced MenuHelper::selectInvoiceFromUserForPayment
   - Accepts requiredStatus parameter for flexible filtering.
9. Adjusted AdminMenu options
   - Added "Confirm Payment" before Logout.
</Changes>

<Test>
Acceptance Criteria:
1. Admin selects "Confirm Payment" from menu.
   - Verify system prompts and displays invoices filtered by status.
2. Admin selects invoice with status = PAID.
   - Verify payment confirmation updates date, sets status, and sends notification.
3. Admin attempts confirmation with empty invoice list.
   - Verify error message: "No pending invoices available for confirmation."
4. Customer completes payment.
   - Verify selection uses util::PaymentStatus::PENDING and payment flow works correctly.
5. Invalid invoice ID entered.
   - Verify system throws runtime_error with "Payment failed: invalid invoice ID."

Precondition:
1. Admin logged into system.
2. At least one invoice exists in datastore.
3. Notification system available.

Steps:
1. Navigate to Admin menu → Confirm Payment.
2. Select invoice with PAID status.
3. Confirm payment and check notification.
4. Attempt with empty invoice list.
5. Attempt with invalid invoice ID.
</Test>

<Review>
Sreeja Reghukumar
</Review>

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.cpp

@@ -543,65 +543,50 @@ static void restoreInventory(ServiceBooking* booking)
 
 /*
 Function: processBookingCancellation
-Description: Handles cancellation or reassignment of a service booking based on user type.
-             Cancels associated job cards, updates booking status, clears technician assignments,
-             restores inventory, and sends appropriate notifications.
-Parameters:
-    ServiceBooking* booking - The booking to cancel or reset
-    util::Map<std::string, JobCard*>& jobs - Collection of job cards to update
-    ServiceManagementService& currentService - Service layer for notifications
-    util::UserType userType - Type of user initiating cancellation (CUSTOMER or TECHNICIAN)
+Description: Cancels jobs and updates the status of a given booking. Sends notifications to the
+             specified user, resets technician assignment if needed, and restores inventory items.
+Parameter: ServiceBooking* booking - Pointer to the booking being cancelled
+           util::ServiceJobStatus newServiceBookingStatus - New status to assign to the booking
+           const std::string& notificationTitle - Title of the booking cancellation notification
+           const std::string& notificationMessage - Message body of the booking cancellation notification
+           User* notifyUser - User to notify about the cancellation
+           util::ServiceJobStatus jobCardStatus - New status to assign to associated job cards
+           const std::string& jobNotificationTitle - Title of the job cancellation notification
+           const std::string& jobNotificationMessage - Message body of the job cancellation notification
+           util::Map<std::string, JobCard*>& jobs - Collection of job cards to update
+           ServiceManagementService& currentService - Reference to the service for sending notifications
 Return type: void
 */
 static void processBookingCancellation(ServiceBooking* booking,
-    util::Map<std::string, JobCard*>& jobs,
-    ServiceManagementService& currentService,
-    util::UserType userType)
+    util::ServiceJobStatus newServiceBookingStatus,
+    const std::string& notificationTitle,
+    const std::string& notificationMessage,
+    User* notifyUser,
+    util::ServiceJobStatus jobCardStatus,
+    const std::string& jobNotificationTitle,
+    const std::string& jobNotificationMessage,
+    util::Map<std::string, JobCard*>& jobs, ServiceManagementService& currentService)
 {
-    if (!booking)
+    if (!booking || !notifyUser)
     {
         return;
     }
     for (int jobIterator = 0; jobIterator < jobs.getSize(); ++jobIterator)
     {
         JobCard* jobCard = jobs.getValueAt(jobIterator);
-        if (!jobCard || jobCard->getBookingId() != booking->getId() || jobCard->getStatus() == util::ServiceJobStatus::CANCELLED)
+        if (jobCard && jobCard->getBookingId() == booking->getId())
         {
-            continue;
-        }
-        jobCard->setStatus(util::ServiceJobStatus::CANCELLED);
-        if (userType == util::UserType::CUSTOMER)
-        {
-            if (User* technician = booking->getAssignedTechnician())
-            {
-                const std::string jobTitle = "Job Cancelled";
-                const std::string jobMessage = "Your job card has been cancelled and the inventory has been restocked.";
-                currentService.sendNotification(technician, jobTitle, jobMessage);
-            }
+            jobCard->setStatus(jobCardStatus);
+            currentService.sendNotification(notifyUser, jobNotificationTitle, jobNotificationMessage);
         }
     }
-    if (userType == util::UserType::CUSTOMER)
+    booking->setStatus(newServiceBookingStatus);
+    currentService.sendNotification(notifyUser, notificationTitle, notificationMessage);
+    if (newServiceBookingStatus == util::ServiceJobStatus::PENDING)
     {
-        booking->setStatus(util::ServiceJobStatus::CANCELLED);
-        if (User* technician = booking->getAssignedTechnician())
-        {
-            const std::string title = "Customer Service Cancelled";
-            const std::string message = "Your assigned job card has been cancelled and the inventory has been restocked.";
-            currentService.sendNotification(technician, title, message);
-        }
+        booking->setAssignedTechnician(nullptr);
+        booking->setAssignedTechnicianId("");
     }
-    else if (userType == util::UserType::TECHNICIAN)
-    {
-        booking->setStatus(util::ServiceJobStatus::PENDING);
-        if (User* customer = booking->getCustomer())
-        {
-            const std::string title = "Technician Unavailable";
-            const std::string message = "Your booking has been reset to pending and we will reassign a new technician shortly.";               
-            currentService.sendNotification(customer, title, message);
-        }
-    }
-    booking->setAssignedTechnician(nullptr);
-    booking->setAssignedTechnicianId("");
     restoreInventory(booking);
 }
 
@@ -639,13 +624,21 @@ void ServiceManagementService::cancelCustomerServiceBookings(const std::string&
         {
             continue;
         }
-        if (booking->getStatus() != util::ServiceJobStatus::PENDING &&
-            booking->getStatus() != util::ServiceJobStatus::STARTED && 
-            booking->getStatus() != util::ServiceJobStatus::IN_PROGRESS)
+        if (booking->getStatus() != util::ServiceJobStatus::PENDING && booking->getStatus() != util::ServiceJobStatus::STARTED)
         {
             continue;
         }
-        processBookingCancellation(booking, jobs, *this, util::UserType::CUSTOMER);
+        User* assignedTechnician = booking->getAssignedTechnician();
+        std::string titleToTechnician = "Customer Service Cancelled";
+        std::string messageToTechnician = "The customer has cancelled their service booking. Your assigned job card has been cancelled and the inventory has been restocked.";
+        std::string jobTitle = "Job Cancelled";
+        std::string jobMessage = "The job has been cancelled. Your job card has been cancelled and the inventory has been restocked.";
+        processBookingCancellation(booking, 
+            util::ServiceJobStatus::CANCELLED,
+            titleToTechnician, messageToTechnician, assignedTechnician,
+            util::ServiceJobStatus::CANCELLED,
+            jobTitle, jobMessage, jobs, *this
+        );
     }
 }
 
@@ -683,9 +676,7 @@ void ServiceManagementService::cancelTechnicianJobs(const std::string& technicia
         {
             continue;
         }
-        if (booking->getStatus() != util::ServiceJobStatus::PENDING &&
-            booking->getStatus() != util::ServiceJobStatus::STARTED &&
-            booking->getStatus() != util::ServiceJobStatus::IN_PROGRESS)
+        if (booking->getStatus() != util::ServiceJobStatus::PENDING && booking->getStatus() != util::ServiceJobStatus::STARTED)
         {
             continue;
         }
@@ -694,7 +685,14 @@ void ServiceManagementService::cancelTechnicianJobs(const std::string& technicia
         {
             continue;
         }
-        processBookingCancellation(booking, jobs, *this, util::UserType::TECHNICIAN);
+        std::string title = "Technician Unavailable";
+        std::string message = "Your assigned technician is no longer available. Your booking has been reset to pending and we will reassign a new technician shortly.";
+        processBookingCancellation(booking,
+            util::ServiceJobStatus::PENDING,
+            title, message, customer,
+            util::ServiceJobStatus::CANCELLED,
+            title, message, jobs, *this
+        );
     }
 }