fix: Update instead of re-fill

CarManagerV2/Car.cs

@@ -54,7 +54,12 @@ namespace CarManagerV2
 
         public bool IsChanged(Car other)
         {
-            return make != other.make || model != other.model || year != other.year || color != other.color || mileage != other.mileage || price != other.price;
+            return make != other.make || model != other.model || year != other.year || color != other.color || mileage != other.mileage || price != other.price || other.color != color;
+        }
+
+        public Car Clone()
+        {
+            return new Car(id, make, model, year, color, mileage, price);
         }
     }
 }

CarManagerV2/CarCard.cs

@@ -12,6 +12,8 @@ namespace CarManagerV2
 {
     public partial class CarCard : UserControl
     {
+        public Car Car;
+
         public string CarName
         {
             get { return lblCarName.Text; }
@@ -58,5 +60,16 @@ namespace CarManagerV2
                 this.CardClicked(this, EventArgs.Empty);
             }
         }
+
+        public void ClearCardClickedHandlers()
+        {
+            if (this.CardClicked != null)
+            {
+                foreach (Delegate d in this.CardClicked.GetInvocationList())
+                {
+                    this.CardClicked -= (EventHandler)d;
+                }
+            }
+        }
     }
 }

CarManagerV2/CarDetailsForm.cs

@@ -67,15 +67,17 @@ namespace CarManagerV2
             btnDelete.Enabled = false;
             var msgbox = new PleaseWait();
             msgbox.Show();
-            Application.DoEvents();
             await Task.Run(() =>
             {
                 StateManager.UpdateCar(car);
+                Console.WriteLine("Saved car: " + car.Id);
             });
             await Task.Run(() =>
             {
                 ImageManager.GetImage(car);
+                Console.WriteLine("Updated image for car: " + car.Id);
             });
+            Console.WriteLine("Car saved. " + car.Id);
             btnSave.Enabled = true;
             btnDelete.Enabled = true;
             this.Close();

CarManagerV2/MainForm.cs

@@ -13,13 +13,16 @@ namespace CarManagerV2
     public partial class MainForm : Form
     {
         List<Car> cars = new List<Car>();
+        List<Car> lastCars = new List<Car>();
 
         public MainForm()
         {
             InitializeComponent();
             SafeManager.InitializeFile("cars.csv");
             List<Car> _cars = SafeManager.ReadCars("cars.csv");
+            
             refreshCars(_cars);
+
         }
 
         private async void refreshCars(List<Car> _cars)
@@ -81,31 +84,87 @@ namespace CarManagerV2
             //    Console.WriteLine($"Added cars: {addedCars.Count}, Removed cars: {removedCars.Count}, Modified cars: {modifiedCars.Count}");
             //}
 
-            flpCars.Controls.Clear();
+            // Get the cars currently in the FlowLayoutPanel to compare with _cars
+
+
+            //flpCars.Controls.Clear();
             foreach (Car car in _cars)
             {
+                // not in list? add it
+                bool isNew = flpCars.Controls.OfType<CarCard>().All(c => c.Car.Id != car.Id);
+                bool isUpdated = false;
+                // existing but changed? update it
                 CarCard card = new CarCard();
+                if (!isNew)
+                {
+                    CarCard existing = flpCars.Controls.OfType<CarCard>().First(c => c.Car.Id == car.Id);
+                    Car existingCar = existing.Car;
+                    if (existing == null)
+                    {
+                        Console.Error.WriteLine($"[L] Error: Existing car card not found for car ID: {car.Id}");
+                        continue;
+                    }
+                    // compare details
+                    Console.WriteLine($"[L] Checking car: {car.Id} | Car Color: {car.Color} | Ex Color: {existingCar.Color}");
+                    if (existingCar.IsChanged(car))
+                    {
+                   
+                        isUpdated = true;
+                        Console.WriteLine($"[L] Updating car: {car.Id}");
+                        // changes
+                        card = existing;
+
+                    }
+                    else
+                    {
+                        // no changes
+                        Console.WriteLine($"[L] No changes for car: {car.Id}");
+                        continue;
+                    }
+                }
+
                 card.CarName = $"{car.Make} {car.Model}";
                 card.CarDetails = $"{car.Year}, {car.Mileage} km, ${car.Price}";
+                card.Car = car.Clone();
                 card.CarImage = await Task.Run(() => ImageManager.GetImage(car));
+                // clear existing event handlers to prevent multiple subscriptions
+                card.ClearCardClickedHandlers();
                 card.CardClicked += (s, e) =>
                 {
                     Console.WriteLine($"Card clicked: {car.Id}");
                     CarDetailsForm detailsForm = new CarDetailsForm(car);
                     detailsForm.FormClosed += async (s2, e2) =>
                     {
+                        Console.WriteLine("Car details form closed.");
                         // refresh cars
-                        Application.DoEvents();
                         Console.WriteLine("Refreshing cars...");
                         List<Car> __cars = await Task.Run(() => SafeManager.ReadCars("cars.csv"));
                         refreshCars(__cars);
                     };
                     detailsForm.ShowDialog();
                 };
+                if (isNew)
+                {
                     flpCars.Controls.Add(card);
                 }
             }
 
+            // Remove cards that are no longer in _cars
+            var carIds = _cars.Select(c => c.Id).ToList();
+            var cardsToRemove = flpCars.Controls.OfType<CarCard>().Where(c => !carIds.Contains(c.Car.Id)).ToList();
+            foreach (var card in cardsToRemove)
+            {
+                flpCars.Controls.Remove(card);
+            }
+            flpCars.Invalidate();
+
+            flpCars.Refresh();
+
+            lastCars = new List<Car>(cars);
+
+
+        }
+
 
         private void btnNewCar_Click(object sender, EventArgs e)
         {