19 selling a selected amount of shares

src/main/java/Model/Exchange.java

@@ -127,6 +127,20 @@ public Transaction buy(String symbol, BigDecimal quantity, Player player) {
     }
 
     public Transaction sell(Share share, Player player) {
+
+        return sell(share, share.getQuantity(), player);
+    }
+
+    public Transaction sell(Share originalShare, BigDecimal sellQuantity, Player player) {
+        if (originalShare == null || sellQuantity == null) {
+            return null;
+        }
+
+        // Kan ikke selge mer enn man eier
+        if (sellQuantity.compareTo(originalShare.getQuantity()) > 0) {
+            return null;
+        }
+
         if (share == null) {
             throw new IllegalArgumentException("Share cannot be null");
         }
@@ -137,8 +151,42 @@ public Transaction sell(Share share, Player player) {
         Sale sale = new Sale(share, this.week);
         sale.commit(player);
 
-        notifyObservers();
 
+        Share shareToSell;
+
+        if (sellQuantity.compareTo(originalShare.getQuantity()) < 0) {
+
+            /**
+             * Delsalg:
+             * Original mengde - mengde som selges = gjenværende mengde
+             */
+
+            player.getPortfolio().removeShare(originalShare);
+
+            BigDecimal remainderShare = originalShare.getQuantity().subtract(sellQuantity);
+
+            player.getPortfolio().addShare(new Share(originalShare.getStock(), remainderShare, originalShare.getPurchasePrice()));
+
+            /**
+             * Legger delmengden midlertidig til i portfolio slik at Sale.commit() finner den
+             */
+
+            shareToSell = new Share(originalShare.getStock(), sellQuantity, originalShare.getPurchasePrice());
+
+            player.getPortfolio().addShare(shareToSell);
+
+        }
+
+        else {
+            // Fullstendig salg: hele andelen selges som normalt
+            shareToSell = originalShare;
+        }
+
+        // Salgstransaksjon via fabrikken
+        Transaction sale = TransactionFactory.createSale(shareToSell, this.week);
+
+        sale.commit(player);
+        notifyObservers();
         return sale;
     }
 

src/main/java/View/MainGameScene.java

@@ -289,22 +289,55 @@ protected void updateItem(Share s, boolean empty) {
 
         updateHoldingsList(holdingsList);
 
+        // Antall Rad
+        HBox quantityRow = new HBox(8);
+        quantityRow.setAlignment(Pos.CENTER_LEFT);
+        TextField quantityField = new TextField();
+        quantityField.setPromptText("Antall");
+        quantityField.setPrefWidth(120);
+        quantityRow.getChildren().addAll(new Label("Quantity to sell:"), quantityField);
+
+        // Fyll inn maks anntall automatisk når man velger en holding
+        holdingsList.getSelectionModel().selectedItemProperty().addListener((obs, old, selected) -> {
+            if (selected != null) {
+                quantityField.setText(selected.getQuantity().toPlainString());
+            }
+        });
+
         Button sellBtn = new Button("Sell Selected");
         sellBtn.setOnAction(e -> {
             Share selected = holdingsList.getSelectionModel().getSelectedItem();
             if (selected == null) {
                 alert("Error", "Select a holding to sell");
                 return;
             }
-            Transaction trans = exchange.sell(selected, player); // observer fires refresh
-            if (trans != null && trans.isCommitted()) {
-                showConfirmation("Sale successful", trans);
-            } else {
-                alert("Failed", "Could not complete sale");
+
+            try {
+                BigDecimal quantity = new BigDecimal(quantityField.getText().trim());
+
+                if (quantity.compareTo(BigDecimal.ZERO) <= 0) {
+                    alert("Error", "Quantity must be greater than zero");
+                    return;
+                }
+
+                Transaction trans = exchange.sell(selected, quantity, player); // observer fires refresh
+
+                if (trans != null && trans.isCommitted()) {
+                    showConfirmation("Sale successful", trans);
+                } 
+
+                else {
+                    alert("Failed", "Could not complete sale. Check quantity.");
+                }
+            } 
+
+            catch (NumberFormatException ex) {
+                alert("Error", "Enter a valid number for quantity");
             }
         });
 
-        box.getChildren().addAll(heading, holdingsList, sellBtn);
+        box.getChildren().addAll(heading, holdingsList, quantityRow, sellBtn);
+
         return box;
     }