her

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/dashboard/DashBoardController.java

@@ -2,6 +2,8 @@
 
 import edu.ntnu.idi.idatt2003.g40.mappe.engine.Exchange;
 import edu.ntnu.idi.idatt2003.g40.mappe.model.*;
+import edu.ntnu.idi.idatt2003.g40.mappe.service.PurchaseCalculator;
+import edu.ntnu.idi.idatt2003.g40.mappe.service.SaleCalculator;
 import edu.ntnu.idi.idatt2003.g40.mappe.service.event.EventData;
 import edu.ntnu.idi.idatt2003.g40.mappe.service.event.EventManager;
 import edu.ntnu.idi.idatt2003.g40.mappe.service.event.EventSubscriber;
@@ -77,6 +79,106 @@ public DashBoardController(final DashBoardView viewElement,
   private void handleStockSelection(final Stock stock, final float amountOwned) {
     getViewElement().setCurrentStock(stock, amountOwned);
     getViewElement().updateGraph(selectedTimeRange);
+    updatePreviews();
+  }
+
+  /**
+   * Recalculates both the cost preview (for buying) and the
+   * sale preview (for selling) based on the currently selected
+   * stock's price and the value of the share quantity input
+   * field, and pushes the results to the view.
+   *
+   * <p>Uses {@link PurchaseCalculator} for the cost preview so it
+   * reflects the same rates that are applied when an actual
+   * purchase is committed (0.5% commission, no tax).</p>
+   *
+   * <p>Uses {@link SaleCalculator} for the sale preview, built on
+   * a {@link Share} that reuses the player's existing position
+   * (purchase price and capped quantity), so the calculated tax
+   * and net amount reflect what the player would actually receive
+   * if they sold right now. If the player owns no shares of the
+   * currently selected stock, the sale preview shows zero.</p>
+   * */
+  private void updatePreviews() {
+    Stock current = getViewElement().getCurrentStock();
+    if (current == null) {
+      getViewElement().updateCostPreview(0f, 0f);
+      getViewElement().updateSalePreview(0f, 0f);
+      return;
+    }
+    String text = getViewElement().getQuantityInputField().getText();
+    if (!Validator.NOT_EMPTY.isValid(text)) {
+      getViewElement().updateCostPreview(0f, 0f);
+      getViewElement().updateSalePreview(0f, 0f);
+      return;
+    }
+    try {
+      BigDecimal quantity = new BigDecimal(text);
+      if (quantity.compareTo(BigDecimal.ZERO) <= 0) {
+        getViewElement().updateCostPreview(0f, 0f);
+        getViewElement().updateSalePreview(0f, 0f);
+        return;
+      }
+      updateCostPreview(current, quantity);
+      updateSalePreview(current, quantity);
+    } catch (IllegalArgumentException e) {
+      getViewElement().updateCostPreview(0f, 0f);
+      getViewElement().updateSalePreview(0f, 0f);
+    }
+  }
+
+  /**
+   * Computes and pushes the cost preview (total cost +
+   * commission) for buying the given quantity of the given
+   * stock at the current price.
+   *
+   * @param stock the stock to compute the cost for.
+   * @param quantity the amount of shares to buy.
+   * */
+  private void updateCostPreview(final Stock stock,
+                                 final BigDecimal quantity) {
+    Share previewShare = new Share(stock, quantity, stock.getSalesPrice());
+    PurchaseCalculator calc = new PurchaseCalculator(previewShare);
+    getViewElement().updateCostPreview(
+            calc.calculateTotal().floatValue(),
+            calc.calculateCommission().floatValue()
+    );
+  }
+
+  /**
+   * Computes and pushes the sale preview (net amount received
+   * + tax) for selling the given quantity of the given stock
+   * at the current price.
+   *
+   * <p>Caps the requested quantity at the amount the player
+   * actually owns (mirroring the behavior in
+   * {@link Exchange#sell}). If the player owns nothing of
+   * the stock, the preview is set to zero.</p>
+   *
+   * @param stock the stock to compute the sale for.
+   * @param quantity the amount of shares the player wants to sell.
+   * */
+  private void updateSalePreview(final Stock stock,
+                                 final BigDecimal quantity) {
+    List<Share> owned = player.getPortfolio().getShares(stock.getSymbol());
+    if (owned.isEmpty()) {
+      getViewElement().updateSalePreview(0f, 0f);
+      return;
+    }
+    Share ownedPosition = owned.getFirst();
+    BigDecimal sellQuantity = quantity.min(ownedPosition.getQuantity());
+    if (sellQuantity.compareTo(BigDecimal.ZERO) <= 0) {
+      getViewElement().updateSalePreview(0f, 0f);
+      return;
+    }
+    Share previewShare = new Share(
+            stock, sellQuantity, ownedPosition.getPurchasePrice()
+    );
+    SaleCalculator calc = new SaleCalculator(previewShare);
+    getViewElement().updateSalePreview(
+            calc.calculateTotal().floatValue(),
+            calc.calculateTax().floatValue()
+    );
   }
 
   /**
@@ -136,6 +238,7 @@ protected void initInteractions() {
     populateStockList("");
     getViewElement().setCurrentStock(stockList.getFirst(), 0);
     getViewElement().updateGraph(selectedTimeRange);
+    updatePreviews();
     getViewElement().setOnAction(DashBoardActions.BUY_SHARES, () -> {
       if (Validator.NOT_EMPTY.isValid(getViewElement().getQuantityInputField().getText())
           && Float.parseFloat(getViewElement().getQuantityInputField().getText()) > 0) {
@@ -147,6 +250,7 @@ protected void initInteractions() {
         );
         if (purchase.isCommited()) {
           getViewElement().addOwnedShares(purchase.getShare().getQuantity().floatValue());
+          updatePreviews();
         }
       }
     });
@@ -161,6 +265,7 @@ protected void initInteractions() {
 
           if(sale.isCommited()) {
             getViewElement().addOwnedShares(-sale.getShare().getQuantity().floatValue());
+            updatePreviews();
         }
       }
     });
@@ -194,6 +299,7 @@ protected void initInteractions() {
     exchange.weekProperty().addListener((observable,o,n) -> {
       getViewElement().updateGraph(selectedTimeRange);
       populateStockList(selectedFilter);
+      updatePreviews();
     });
 
     getViewElement().getQuantityInputField().setTextFormatter(new TextFormatter<>(change -> {
@@ -203,6 +309,10 @@ protected void initInteractions() {
       return null;
     }));
 
+    getViewElement().getQuantityInputField().textProperty().addListener((observable, o, n) -> {
+      updatePreviews();
+    });
+
     getViewElement().getQuantityInputField().focusedProperty().addListener((observable, wasFocused, isNowFocused) -> {
       if (!isNowFocused && getViewElement().getQuantityInputField().getText().trim().isEmpty()) {
           getViewElement().getQuantityInputField().setText("1.0");
@@ -241,6 +351,7 @@ public void handleStockPoolUpdate(final List<Stock> updatedStocks) {
             .getTotalShareQuantityBySymbol(firstStock.getSymbol());
 
     handleStockSelection(firstStock, ownedAmount.floatValue());
+    updatePreviews();
   }
 
   /**
@@ -268,5 +379,6 @@ public <T> void handleEvent(final EventData<T> data) {
         );
       }
 
+    updatePreviews();
   }
 }

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/dashboard/DashBoardView.java

@@ -208,6 +208,32 @@ public final class DashBoardView extends ViewElement<HBox, DashBoardActions> {
    * */
   private Label highPriceLabel;
 
+  /**
+   * The label showing the estimated cost of buying/selling
+   * the chosen quantity of shares at the current price.
+   * */
+  private Label costPreviewLabel;
+
+  /**
+   * The label showing the estimated commission and tax
+   * for the chosen quantity of shares at the current price.
+   * */
+  private Label feesPreviewLabel;
+
+  /**
+   * The label showing the estimated total amount received
+   * when selling the chosen quantity of shares at the
+   * current price (gross minus commission and tax).
+   * */
+  private Label saleTotalPreviewLabel;
+
+  /**
+   * The label showing the estimated tax that will be paid
+   * when selling the chosen quantity of shares at the
+   * current price.
+   * */
+  private Label saleTaxPreviewLabel;
+
   /**
    * Constructor.
    * */
@@ -300,6 +326,11 @@ protected void initLayout() {
     buySharesBtn = new Button("buy");
     sellSharesBtn = new Button("sell");
 
+    costPreviewLabel = new Label("Cost: 0 NOK");
+    feesPreviewLabel = new Label("Commission: 0 NOK   Tax: 0 NOK");
+    saleTotalPreviewLabel = new Label("Sale total: 0 NOK");
+    saleTaxPreviewLabel = new Label("Tax: 0 NOK");
+
     grid = new GridPane();
     grid.setHgap(0);
     grid.setVgap(0);
@@ -325,8 +356,16 @@ protected void initLayout() {
     HBox.setHgrow(buySharesBtn, Priority.ALWAYS);
     HBox.setHgrow(sellSharesBtn, Priority.ALWAYS);
 
-    grid.add(qtySection, 0, 0, 6,1);
-    grid.add(tradeBtns, 0, 1, 6, 1);
+    grid.add(costPreviewLabel, 0, 0, 6, 1);
+    grid.add(feesPreviewLabel, 0, 1, 6, 1);
+    grid.add(qtySection, 0, 2, 6, 1);
+    grid.add(saleTotalPreviewLabel, 0, 3, 6, 1);
+    grid.add(saleTaxPreviewLabel, 0, 4, 6, 1);
+    grid.add(tradeBtns, 0, 5, 6, 1);
+    GridPane.setHalignment(costPreviewLabel, HPos.CENTER);
+    GridPane.setHalignment(feesPreviewLabel, HPos.CENTER);
+    GridPane.setHalignment(saleTotalPreviewLabel, HPos.CENTER);
+    GridPane.setHalignment(saleTaxPreviewLabel, HPos.CENTER);
 
     HBox.setHgrow(stockIdentity, Priority.ALWAYS);
     HBox.setHgrow(priceStats, Priority.ALWAYS);
@@ -382,6 +421,10 @@ protected void initStyling() {
     rightQty.getStyleClass().add("dashboard-rightQty");
     qtySection.getStyleClass().add("dashboard-qtySection");
     tradeBtns.getStyleClass().add("dashboard-tradeBtns");
+    costPreviewLabel.getStyleClass().add("dashboard-cost-preview");
+    feesPreviewLabel.getStyleClass().add("dashboard-fees-preview");
+    saleTotalPreviewLabel.getStyleClass().add("dashboard-sale-preview");
+    saleTaxPreviewLabel.getStyleClass().add("dashboard-tax-preview");
     timeRangeSelector.getStyleClass().add("dashboard-combo-box");
   }
 
@@ -516,6 +559,45 @@ private void setHighPriceLabel(final float value) {
     highPriceLabel.setText("High: " + Math.round(value * 100f) / 100f + " NOK");
   }
 
+  /**
+   * Updates the cost preview labels, showing how much it will
+   * cost to buy the chosen amount of shares at the current
+   * stock price (gross + commission), as well as the
+   * commission part of the cost on its own.
+   *
+   * @param cost the estimated total cost in NOK
+   *             (gross + commission).
+   * @param commission the estimated commission in NOK.
+   * */
+  public void updateCostPreview(final float cost,
+                                final float commission) {
+    costPreviewLabel.setText("Cost: " + Math.round(cost * 100f) / 100f + " NOK");
+    feesPreviewLabel.setText(
+            "Commission: " + Math.round(commission * 100f) / 100f + " NOK"
+    );
+  }
+
+  /**
+   * Updates the sale preview labels, showing how much the
+   * player would receive on their account if they sold the
+   * chosen amount of currently owned shares right now
+   * (gross minus commission and tax), as well as the tax
+   * part of that calculation on its own.
+   *
+   * @param saleNet the estimated net amount received from
+   *                the sale in NOK (gross - commission - tax).
+   * @param tax the estimated tax in NOK.
+   * */
+  public void updateSalePreview(final float saleNet,
+                                final float tax) {
+    saleTotalPreviewLabel.setText(
+            "Sale total: " + Math.round(saleNet * 100f) / 100f + " NOK"
+    );
+    saleTaxPreviewLabel.setText(
+            "Tax: " + Math.round(tax * 100f) / 100f + " NOK"
+    );
+  }
+
   /**
    * Getter method for the search text field in the sidebar.
    *