Fix Customer Menu View Invoices UI and Navigation Issues

- Added tabular invoice list for better navigation
- Enabled user to select an invoice before viewing full details
- Displayed Payment Mode in detailed invoice view
- Removed duplicate pressEnter() calls
- Improved console messages and formatting for clarity

Fixes #1784

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

@@ -201,8 +201,6 @@ inline bool listServiceBookings(util::Map<std::string, const ServiceBooking*>& c
         << std::setw(15) << "VehicleNo"
         << std::setw(15) << "Brand"
         << std::setw(15) << "Model"
-        << std::setw(20) << "Technician"
-        << std::setw(15) << "TechnicianID"
         << std::endl;
     for (int iterator = 0; iterator < bookingsSize; iterator++)
     {
@@ -219,8 +217,6 @@ inline bool listServiceBookings(util::Map<std::string, const ServiceBooking*>& c
                 << std::setw(15) << currentBooking->getVehicleNumber()
                 << std::setw(15) << currentBooking->getVehicleBrand()
                 << std::setw(15) << currentBooking->getVehicleModel()
-                << std::setw(20) << ((currentAssignedTechnician == nullptr || currentAssignedTechnician->getName().empty()) ? "NULL" : currentAssignedTechnician->getName())
-                << std::setw(15) << ((currentAssignedTechnician == nullptr || currentAssignedTechnician->getId().empty()) ? "NULL" : currentAssignedTechnician->getId())
                 << std::endl;
             serviceBookingsMap.insert(currentIndex++, currentBooking);
         }
@@ -239,7 +235,7 @@ Returns:
 inline const ServiceBooking* selectPendingServiceBookings(util::Map<int, const ServiceBooking*>& serviceBookingsMap)
 {
 	int userInputIndex;
-	std::cout << "\nEnter a valid service index: ";
+	std::cout << "\nEnter a service index: ";
     util::read(userInputIndex);
 	if (serviceBookingsMap.find(userInputIndex) != -1)
     {
@@ -304,7 +300,7 @@ Returns:
 inline const User* selectTechnician(util::Map<int, const User*>& currentAvailableTechniciansMap)
 {
     int userInputIndex;
-    std::cout << "\nEnter valid technician index: ";
+    std::cout << "\nEnter technician index: ";
     util::read(userInputIndex);
     if (currentAvailableTechniciansMap.find(userInputIndex) != -1)
     {
@@ -416,6 +412,73 @@ inline util::PaymentMode selectPaymentMode()
     }
 }
 
+/*
+Function: displayInvoicesInTabularForm
+Description:
+    Displays all invoices in a tabular format. Each row shows booking details,
+    vehicle info, technician details, discount, total amount, invoice date,
+    and payment status. If inventory items exist for an invoice, they are
+    displayed in a separate table below the invoice row.
+Parameters:
+    - currentInvoices: util::Map<std::string, const Invoice*>
+      Map of invoice IDs to Invoice pointers.
+Returns:
+    - void
+*/
+inline const Invoice* selectInvoiceToDisplay(util::Map<std::string, const Invoice*>& currentInvoices)
+{
+    int currentIndex = 1, choice;
+    util::Map<int, const Invoice*> currentInvoicesIndexMap;
+    if (currentInvoices.isEmpty())
+    {
+        std::cout << "No invoices available.\n\n";
+        return nullptr;
+    }
+    std::cout  
+        << std::left
+        << std::setw(10) << "Index"
+        << std::setw(12) << "BookingID"
+        << std::setw(15) << "VehicleNumber"
+        << std::setw(20) << "TechnicianName"
+        << std::setw(15) << "TotalAmount"
+        << std::setw(25) << "InvoiceDate"
+        << std::setw(15) << "PaymentStatus"
+        << std::setw(15) << "PaymentMode"
+        << std::endl;
+    for (int iterator = 0; iterator < currentInvoices.getSize(); iterator++)
+    {
+        const Invoice* currentInvoice = currentInvoices.getValueAt(iterator);
+        if (!currentInvoice)
+        {
+            continue;
+        }
+        const User* currentTechnician = currentInvoice->getBooking()->getAssignedTechnician();
+        std::cout << std::left
+            << std::setw(10) << currentIndex
+            << std::setw(12) << currentInvoice->getBookingId()
+            << std::setw(15) << currentInvoice->getBooking()->getVehicleNumber()
+            << std::setw(20) << ((currentTechnician && !currentTechnician->getName().empty()) ? currentTechnician->getName() : "NULL")
+            << std::setw(15) << currentInvoice->getTotalAmount()
+            << std::setw(25) << currentInvoice->getInvoiceDate().toString()
+            << std::setw(15) << util::getPaymentStatusString(currentInvoice->getStatus())
+            << std::setw(15) << util::getPaymentModeString(currentInvoice->getPaymentMethod())
+            << std::endl;
+        currentInvoicesIndexMap.insert(currentIndex++, currentInvoice);
+    }
+    std::cout << "Enter an index: ";
+    util::read(choice);
+    int currentSelectedIndex = currentInvoicesIndexMap.find(choice);
+    if (currentSelectedIndex != -1)
+    {
+        return currentInvoicesIndexMap.getValueAt(currentSelectedIndex);
+    }
+    else
+    {
+        std::cout << "Enter a valid index.\n";
+        return nullptr;
+    }
+}
+
 /*
 Function: displayInvoices 
 Description: Displays detailed information for all invoices associated with the customer,
@@ -429,34 +492,48 @@ Throws:
 */
 inline void displayInvoices(util::Map<std::string, const Invoice*> currentUserInvoices)
 {
+    std::cout << std::endl;
     if (currentUserInvoices.getSize() == 0)
     {
-        std::cout << "No invoices found for this account." << std::endl << std::endl;
+        std::cout << "No invoices found for this account.\n\n";
         return;
     }
     else
     {
-        for (int index = 0; index < currentUserInvoices.getSize(); index++)
+        bool doRun = true;
+        do
         {
-            const Invoice* currentInvoice = currentUserInvoices.getValueAt(index);
+            const Invoice* selectedInvoice;
-            if (currentInvoice)
+            int choice;
+            selectedInvoice = selectInvoiceToDisplay(currentUserInvoices);
+            if (selectedInvoice)
             {
-                const User* currentTechnician = currentInvoice->getBooking()->getAssignedTechnician();
+                const User* currentTechnician = selectedInvoice->getBooking()->getAssignedTechnician();
-                std::cout << "\nInvoice Details\n";
+                util::clear();
-                std::cout << "Booking ID: " << currentInvoice->getBookingId() << std::endl;
+                std::cout << "Invoice Details\n";
-                std::cout << "Vehicle Brand: " << currentInvoice->getBooking()->getVehicleBrand() << std::endl;
+                std::cout << std::left << std::setw(20) << "Booking ID:"
-                std::cout << "Vehicle Number: " << currentInvoice->getBooking()->getVehicleNumber() << std::endl;
+                    << selectedInvoice->getBookingId() << std::endl;
-                std::cout << "Technician ID: " <<
+                std::cout << std::left << std::setw(20) << "Vehicle Brand:"
-                    ((currentTechnician != nullptr && currentTechnician->getId() != "") ?
+                    << selectedInvoice->getBooking()->getVehicleBrand() << std::endl;
-                        currentTechnician->getId() : "Null") << std::endl;
+                std::cout << std::left << std::setw(20) << "Vehicle Number:"
-                std::cout << "Technician Name: " <<
+                    << selectedInvoice->getBooking()->getVehicleNumber() << std::endl;
-                    ((currentTechnician != nullptr && currentTechnician->getName() != "") ?
+                std::cout << std::left << std::setw(20) << "Technician ID:"
-                        currentTechnician->getName() : "Null") << std::endl;
+                    << ((currentTechnician != nullptr && !currentTechnician->getId().empty())
-                std::cout << "Discount(%): " << currentInvoice->getDiscountPercentage() << std::endl;
+                        ? currentTechnician->getId() : "NULL") << std::endl;
-                std::cout << "Total Amount: " << currentInvoice->getTotalAmount() << std::endl;
+                std::cout << std::left << std::setw(20) << "Technician Name:"
-                std::cout << "Invoice Date: " << currentInvoice->getInvoiceDate().toString() << std::endl;
+                    << ((currentTechnician != nullptr && !currentTechnician->getName().empty())
-                std::cout << "Payment Status: " << util::getPaymentStatusString(currentInvoice->getStatus()) << std::endl;
+                        ? currentTechnician->getName() : "NULL") << std::endl;
-                auto inventoryItemsInInvoice = currentInvoice->getParts();
+                std::cout << std::left << std::setw(20) << "Discount(%):"
+                    << selectedInvoice->getDiscountPercentage() << std::endl;
+                std::cout << std::left << std::setw(20) << "Total Amount:"
+                    << selectedInvoice->getTotalAmount() << std::endl;
+                std::cout << std::left << std::setw(20) << "Invoice Date:"
+                    << selectedInvoice->getInvoiceDate().toString() << std::endl;
+                std::cout << std::left << std::setw(20) << "Payment Status:"
+                    << 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();
                 if (inventoryItemsInInvoice.isEmpty())
                 {
                     std::cout << "No inventory items used.\n\n";
@@ -478,14 +555,31 @@ inline void displayInvoices(util::Map<std::string, const Invoice*> currentUserIn
                         << std::setw(10) << currentItem->getPrice()
                         << std::endl;
                 }
+                std::cout << "\n\nDo you want to display another Invoice (1-Yes, 2-No): ";
+                util::read(choice);
+                if (choice == 1)
+                {
+                    doRun = true;
+                    util::clear();
+                }
+                else if (choice == 2)
+                {
+                    doRun = false;
+                }
+                else
+                {
+                    std::cout << "Invalid choice\n";
+                    doRun = false;
+                }
             }
             else
             {
-                throw std::runtime_error("Null invoice encountered while displaying invoices.");
+                std::cout << "Unable to fetch the selected invoice\n";
+                doRun = false;
             }
-        }
+
+        } while (doRun);
     }
-    util::pressEnter();
 }
 
 /*
@@ -803,6 +897,7 @@ inline const Service* selectServiceFromServices(const util::Map<std::string, con
         std::cout << "No active services available." << std::endl;
         return nullptr;
     }
+    std::cout << std::endl;
     util::Map<int, const Service*> activeServicesMap;
     int currentIndex = 1;
     int userInputIndex;
@@ -849,6 +944,17 @@ inline const Service* selectServiceFromServices(const util::Map<std::string, con
     return activeServicesMap[userInputIndex];
 }
 
+/*
+Function: filterComboPackages
+Description:
+    Filters the given list of combo packages and returns only those that are ACTIVE.
+Parameters:
+    - comboPackages: util::Map<std::string, const ComboPackage*>&
+      Map of combo package IDs to ComboPackage pointers.
+Returns:
+    - util::Map<std::string, const ComboPackage*>
+      Map containing only active combo packages.
+*/
 inline util::Map<std::string, const ComboPackage*> filterComboPackages(util::Map<std::string, const ComboPackage*>& comboPackages)
 {
     util::Map<std::string, const ComboPackage*> activeComboPackages;
@@ -878,7 +984,7 @@ inline const ComboPackage* selectComboPackageFromPackages(const util::Map<std::s
     std::cout << std::left
         << std::setw(10) << "Index"
         << std::setw(15) << "Combo ID"
-        << std::setw(25) << "Combo Name"
+        << std::setw(35) << "Combo Name"
         << std::setw(15) << "Estimate Cost"
         << std::endl;
     for (int index = 0; index < comboPackages.getSize(); index++)
@@ -892,7 +998,7 @@ inline const ComboPackage* selectComboPackageFromPackages(const util::Map<std::s
         std::cout << std::left
             << std::setw(10) << currentIndex
             << std::setw(15) << currentComboPackage->getId()
-            << std::setw(25) << util::truncateString(currentComboPackage->getPackageName(), 20)
+            << std::setw(35) << util::truncateString(currentComboPackage->getPackageName(), 30)
             << std::setw(15) << util::calculateComboServiceEstimatedCost(currentComboPackage)
             << std::endl;
         currentIndex++;