Merged PR 1202: Vehicle Service System v1.2.0.0

## New Features

### Shared Memory DataStore

* Replaced the existing in-memory DataStore with a shared-memory implementation using Windows File Mapping.
* Added support for sharing application data between multiple running instances.
* Created separate mappings for users, notifications, services, bookings, invoices, payments, and other entities.

### Binary Data Storage

* Added binary serialization for all major entities.
* Introduced record tracking to handle new, modified, and deleted records.
* Added automatic growth and shrinking of mappings when required.

## Refactoring

### DataStore Changes

* Refactored DataStore to use shared memory instead of local process memory.
* Added generic helper functions for loading and saving records.
* Updated application startup and shutdown to initialize and clean up shared-memory resources.

### Synchronization

* Added a global mutex to synchronize datastore operations across processes.
* Added remapping logic to detect mapping size changes made by other instances.

## Bug Fixes

* Fixed issues with data not being shared correctly between multiple application instances.
* Improved reliability of record updates and deletions.
* Fixed stale mapping issues when mappings were resized by another process.

Related work items: #1925, #1926, #1927, #1928, #1929, #1930, #1949, #1950, #1951, #1952, #1953, #1954, #1955, #1956, #1957, #1958, #1959, #1960, #2061, #2074, #2075, #2076, #2077, #2078, #2079, #2080, #2081, #2082, #2100, #2105, #2114, #2115, #2116

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/DataStore.cpp

@@ -358,7 +358,7 @@ util::Map<std::string, TrackedRecord<ServiceBooking>>& DataStore::getServiceBook
             {
                 throw std::runtime_error("Invalid service index.");
             }
-            auto currentService = services.getValueAt(serviceIndex);
+            auto& currentService = services.getValueAt(serviceIndex);
             servicesInBooking[currentServiceId] = currentService.data;
         }
         serviceBooking->setServices(servicesInBooking);
@@ -369,7 +369,7 @@ util::Map<std::string, TrackedRecord<ServiceBooking>>& DataStore::getServiceBook
             {
                 throw std::runtime_error("Invalid user index.");
             }
-            auto customer = users.getValueAt(userIndex);
+            auto& customer = users.getValueAt(userIndex);
             serviceBooking->setCustomer(customer.data);
         }
         if (!serviceBooking->getAssignedTechnicianId().empty())
@@ -379,7 +379,7 @@ util::Map<std::string, TrackedRecord<ServiceBooking>>& DataStore::getServiceBook
             {
                 throw std::runtime_error("Invalid technician index.");
             }
-            auto technician = users.getValueAt(technicianIndex);
+            auto& technician = users.getValueAt(technicianIndex);
             serviceBooking->setAssignedTechnician(technician.data);
         }
     }
@@ -423,7 +423,7 @@ util::Map<std::string, TrackedRecord<JobCard>>& DataStore::getJobCards()
         {
             throw std::runtime_error("Invalid service ID: " + serviceId);
         }
-        auto trackedService = services.getValueAt(serviceIndex);
+        auto& trackedService = services.getValueAt(serviceIndex);
         jobCard->setService(trackedService.data);
         const std::string& technicianId = jobCard->getTechnicianId();
         if (!technicianId.empty())
@@ -433,7 +433,7 @@ util::Map<std::string, TrackedRecord<JobCard>>& DataStore::getJobCards()
             {
                 throw std::runtime_error("Invalid technician ID: " + technicianId);
             }
-            auto trackedTechnician = users.getValueAt(technicianIndex);
+            auto& trackedTechnician = users.getValueAt(technicianIndex);
             jobCard->setTechnician(trackedTechnician.data);
         }
     }
@@ -691,7 +691,7 @@ void DataStore::saveObservers(MappingInfo& mapping, util::Map<std::string, User*
     SharedMemory::setRecordCount(mapping, observerCount);
     for (size_t index = 0; index < observerCount; index++)
     {
-        SerializedObserver serializedObserver;
+        SerializedObserver serializedObserver{};
         User* user = observers.getValueAt(static_cast<int>(index));
         strcpy_s(serializedObserver.id, sizeof(serializedObserver.id), user->getId().c_str());
         SerializedObserver* destination = static_cast<SerializedObserver*>(SharedMemory::getRecordAddress(mapping, index));

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp

@@ -220,6 +220,13 @@ void CustomerMenu::selectService()
         util::pressEnter();
         return;
     }
+    if (!verifyAllPaymentsCompleted(m_controller))
+    {
+        std::cout << "Your booking cannot be processed because you have pending payments for previous services. Please complete all outstanding invoices before booking a new service."
+             << std::endl;
+        util::pressEnter();
+        return;
+    }
     util::Vector<std::string> selectedServices;
     const Service* selectedService = selectServiceFromServices(services);
     if (selectedService == nullptr)
@@ -262,6 +269,13 @@ void CustomerMenu::selectComboPackage()
         util::pressEnter();
         return;
     }
+    if (!verifyAllPaymentsCompleted(m_controller))
+    {
+        std::cout << "Your booking cannot be processed because you have pending payments for previous services. Please complete all outstanding invoices before booking a new combo package."
+            << std::endl;
+        util::pressEnter();
+        return;
+    }
     const ComboPackage* selectedComboPackage = selectComboPackageFromPackages(activeComboPackages);
     if (selectedComboPackage == nullptr)
     {

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/Menu.cpp

@@ -67,7 +67,7 @@ Return type: void
 */
 void Menu::eventListenerLoop()
 {
-    HANDLE handles[3];
+    HANDLE handles[3] = { NULL, NULL, NULL };
     handles[0] = m_accountDisabledEvent;
     handles[1] = m_notificationAvailableEvent;
     handles[2] = m_shutdownEvent;

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h

@@ -588,7 +588,7 @@ inline void displayInvoices(util::Map<std::string, const Invoice*> currentUserIn
                     << util::getPaymentStatusString(selectedInvoice->getStatus()) << std::endl;
                 std::cout << std::left << std::setw(20) << "Payment Mode:"
                     << util::getPaymentModeString(selectedInvoice->getPaymentMethod()) << std::endl;
-                auto inventoryItemsInInvoice = selectedInvoice->getParts();
+                auto& inventoryItemsInInvoice = selectedInvoice->getParts();
                 if (inventoryItemsInInvoice.isEmpty())
                 {
                     std::cout << "No inventory items used.\n\n";
@@ -597,7 +597,6 @@ inline void displayInvoices(util::Map<std::string, const Invoice*> currentUserIn
                 std::cout << "\nItems Used:\n";
                 std::cout << std::left
                     << std::setw(20) << "ItemName"
-                    << std::setw(10) << "Quantity"
                     << std::setw(10) << "Price"
                     << std::endl;
                 std::cout << std::string(40, '-') << std::endl;
@@ -606,7 +605,6 @@ inline void displayInvoices(util::Map<std::string, const Invoice*> currentUserIn
                     InventoryItem* currentItem = inventoryItemsInInvoice.getValueAt(iterator);
                     std::cout << std::left
                         << std::setw(20) << currentItem->getPartName()
-                        << std::setw(10) << currentItem->getQuantity()
                         << std::setw(10) << currentItem->getPrice()
                         << std::endl;
                 }
@@ -1146,7 +1144,9 @@ inline void displayAllComboPackages(util::Map<std::string, const ComboPackage*>
     for (int index = 0; index < comboPackages.getSize(); index++)
     {
         const ComboPackage* currentComboPackage = comboPackages.getValueAt(index);
-        if (currentComboPackage && currentComboPackage->getState() != util::State::ACTIVE)
+        if (currentComboPackage) 
+        {
+            if (currentComboPackage->getState() != util::State::ACTIVE)
             {
                 continue;
             }
@@ -1157,6 +1157,7 @@ inline void displayAllComboPackages(util::Map<std::string, const ComboPackage*>
                 << std::endl;
         }
     }
+}
 
 
 /*
@@ -1180,7 +1181,9 @@ inline const ComboPackage* selectComboPackageFromPackages(const util::Map<std::s
     for (int index = 0; index < comboPackages.getSize(); index++)
     {
         const ComboPackage* currentComboPackage = comboPackages.getValueAt(index);
-        if (currentComboPackage && currentComboPackage->getState() != util::State::ACTIVE)
+        if (currentComboPackage)
+        {
+            if (currentComboPackage->getState() != util::State::ACTIVE)
             {
                 continue;
             }
@@ -1193,6 +1196,7 @@ inline const ComboPackage* selectComboPackageFromPackages(const util::Map<std::s
                 << std::endl;
             currentIndex++;
         }
+    }
     if (activeComboPackages.getSize() == 0)
     {
         std::cout << "No active combo packages available." << std::endl;
@@ -1467,3 +1471,45 @@ inline void displayNewNotification(util::Vector<const Notification*> notificatio
             MB_ICONINFORMATION);
     }
 }
+
+/*
+Function: verifyAllPaymentsCompleted
+Description: Checks whether the authenticated customer has completed
+             all payments for their invoices. Iterates through all
+             invoices belonging to the customer and verifies that
+             each invoice has a payment status of COMPLETED.
+Parameters: Controller& m_controller -
+            reference to the Controller object used to access
+            authenticated user and invoice data
+Return type: bool
+             true if all invoices for the authenticated customer
+             are completed, false if any invoice is pending or not completed
+Throws: std::runtime_error if no authenticated user is found
+*/
+inline bool verifyAllPaymentsCompleted(Controller& m_controller)
+{
+    const User* authenticatedUser = m_controller.getAuthenticatedUser();
+    if (!authenticatedUser)
+    {
+        throw std::runtime_error("No authenticated user found.");
+    }
+    const std::string& authenticatedUserId = authenticatedUser->getId();
+    util::Map<std::string, const Invoice*> listOfInvoices = m_controller.getAllInvoices();
+    for (int invoiceIndex = 0; invoiceIndex < listOfInvoices.getSize(); ++invoiceIndex)
+    {
+        const Invoice* invoice = listOfInvoices.getValueAt(invoiceIndex);
+        if (!invoice)
+        {
+            continue;
+        }
+        const std::string& customerId = invoice->getBooking()->getCustomerId();
+        if (customerId == authenticatedUserId)
+        {
+            if (invoice->getStatus() != util::PaymentStatus::COMPLETED)
+            {
+                return false;
+            }
+        }
+    }
+    return true;
+}