adds purchase and sale functionality with proper handling

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Controller/AppControllers/StockAppController.java

@@ -1,31 +1,108 @@
 package edu.ntnu.idi.idatt2003.gruppe42.Controller.AppControllers;
 
 import edu.ntnu.idi.idatt2003.gruppe42.Controller.MarketController;
+import edu.ntnu.idi.idatt2003.gruppe42.Model.Player;
+import edu.ntnu.idi.idatt2003.gruppe42.Model.Share;
+import edu.ntnu.idi.idatt2003.gruppe42.Model.Stock;
+import edu.ntnu.idi.idatt2003.gruppe42.Model.Transaction.Transaction;
 import edu.ntnu.idi.idatt2003.gruppe42.View.Apps.StockApp;
+import java.math.BigDecimal;
 
 public class StockAppController implements AppController {
   private MarketController marketController;
   private StockApp stockPopup;
+  private Stock currentStock;
 
-  public StockAppController(StockApp stockPopup, MarketController marketController) {
+  public StockAppController(StockApp stockPopup, MarketController marketController, Player player) {
     this.stockPopup = stockPopup;
     this.marketController = marketController;
 
-    stockPopup.getStockList().getItems().addAll(marketController.getMarket());
 
-    stockPopup.getSearchField().textProperty().addListener((obs, old, newValue) -> {
+    stockPopup.getStockList().getItems().addAll(marketController.getExchange().getAllStocks());
+
+    stockPopup.getSearchField().textProperty().addListener((
+        obs, old, newValue) -> {
+      if (stockPopup.getCurrentStock() != null) {
+        stockPopup.openSearchPage();
+      }
       stockPopup.getStockList().getItems().setAll(marketController.getMarket(newValue));
     });
 
+    stockPopup.getBuyButton().setOnMouseClicked(event -> {
+      currentStock = stockPopup.getCurrentStock();
+      if (currentStock == null) {
+        return;
+      }
+
+      String quantityText = stockPopup.getQuantityField().getText();
+      BigDecimal quantity;
+      try {
+        quantity = new BigDecimal(quantityText);
+        if (quantity.compareTo(BigDecimal.ZERO) <= 0) {
+          return;
+        }
+      } catch (NumberFormatException e) {
+        return;
+      }
+
+      Transaction transaction = marketController.getExchange().buy(
+          currentStock.getSymbol(), quantity, player
+      );
+
+      if (transaction == null) {
+        return;
+      }
+
+      player.getTransactionArchive().add(transaction);
+      player.getPortfolio().addShare(transaction.getShare());
+    });
+
+    stockPopup.getSellButton().setOnMouseClicked(event -> {
+      currentStock = stockPopup.getCurrentStock();
+      if (currentStock == null) {
+        return;
+      }
+
+      String quantityText = stockPopup.getQuantityField().getText();
+      BigDecimal quantityToSell;
+      try {
+        quantityToSell = new BigDecimal(quantityText);
+        if (quantityToSell.compareTo(BigDecimal.ZERO) <= 0) {
+          return;
+        }
+      } catch (NumberFormatException e) {
+        return;
+      }
+
+      player.getPortfolio().getShares().stream()
+          .filter(s -> s.getStock().getSymbol().equals(currentStock.getSymbol()))
+          .findFirst()
+          .ifPresent(existingShare -> {
+            if (existingShare.getQuantity().compareTo(quantityToSell) < 0) {
+              return;
+            }
+
+            Transaction transaction = marketController.getExchange().sell(existingShare, quantityToSell, player);
+            player.getTransactionArchive().add(transaction);
+            player.getPortfolio().removeShare(transaction.getShare());
+          });
+    });
+
   }
 
+  /**
+   * Updates the app state on each simulation tick.
+   * Refreshes the market data and updates the price label for the currently viewed stock.
+   */
   @Override
-  public void nextTick(){
+  public void nextTick() {
     System.out.println("[DEBUG] StockAppController.nextTick() - Updating Market");
     marketController.updateMarket();
-    if (stockPopup.getCurrentStock() != null) {
-      System.out.println("[DEBUG] Updating Price Label for: " + stockPopup.getCurrentStock().getCompany());
-      stockPopup.updatePriceLabel(stockPopup.getCurrentStock());
+    Stock currentStockInView = stockPopup.getCurrentStock();
+    if (currentStockInView != null) {
+      System.out.println("[DEBUG] Updating Price Label for: "
+          + currentStockInView.getCompany());
+      stockPopup.updatePriceLabel(currentStockInView);
     }
   }
 }

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Controller/GameController.java

@@ -3,7 +3,6 @@
 import edu.ntnu.idi.idatt2003.gruppe42.Controller.AppControllers.AppController;
 import edu.ntnu.idi.idatt2003.gruppe42.Model.Player;
 
-import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Timer;

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Controller/MarketController.java

@@ -1,5 +1,6 @@
 package edu.ntnu.idi.idatt2003.gruppe42.Controller;
 
+import edu.ntnu.idi.idatt2003.gruppe42.Model.Exchange;
 import edu.ntnu.idi.idatt2003.gruppe42.Model.Stock;
 import edu.ntnu.idi.idatt2003.gruppe42.Model.StockFileHandler;
 import edu.ntnu.idi.idatt2003.gruppe42.View.Apps.StockApp;
@@ -12,7 +13,7 @@
 
 public class MarketController {
 
-  private List<Stock> market;
+  private Exchange exchange;
   private int stockResolution;
   private StockApp stockApp;
 
@@ -21,7 +22,7 @@ public MarketController() {
 
     try {
       Path path = Path.of(getClass().getClassLoader().getResource("stocks.csv").toURI());
-      market = StockFileHandler.readFromFile(path);
+      exchange = new Exchange(StockFileHandler.readFromFile(path));
 
       startMarket();
       System.out.println("Market loaded");
@@ -31,19 +32,18 @@ public MarketController() {
     }
   }
 
-  public List<Stock> getMarket() {
-    return market;
+  public Exchange getExchange() {
+    return exchange;
   }
 
   public List<Stock> getMarket(String searchTerm) {
-    return market.stream()
-        .filter(stock -> stock.getCompany().toLowerCase().contains(searchTerm.toLowerCase()))
-        .toList();
+    return exchange.findStocks(searchTerm);
   }
 
   public void updateMarket() {
-    System.out.println("[DEBUG] MarketController.updateMarket() - Updating prices for " + market.size() + " stocks");
-    for (Stock stock : market) {
+    System.out.println("[DEBUG] MarketController.updateMarket() - Updating prices for "
+        + exchange.getAllStocks().size() + " stocks");
+    for (Stock stock : exchange.getAllStocks()) {
       stock.updatePrice();
       if (stock.getStockGraph().getVisibility()) {
         stock.updateStockGraph();

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Controller/ViewControllers/DesktopViewController.java

@@ -51,7 +51,7 @@ public DesktopViewController(Player player, GameController gameController) {
 
     StockApp stockApp = new StockApp(400, 300, 120, 120);
     MarketController marketController = new MarketController();
-    gameController.addAppController(new StockAppController(stockApp, marketController));
+    gameController.addAppController(new StockAppController(stockApp, marketController, player));
 
     MailApp mailApp = new MailApp(400, 300, 160, 160);
 

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Model/Calculator/SaleCalculator.java

@@ -14,25 +14,52 @@ public SaleCalculator(Share share) {
     this.quantity = share.getQuantity();
   }
 
+  /**
+   * Calculates the gross value of the sale (quantity * sales price).
+   *
+   * @return the gross sale value
+   */
   @Override
   public BigDecimal calculateGross() {
     return salesPrice.multiply(quantity);
   }
 
+  /**
+   * Calculates the commission for the sale (1% of gross).
+   *
+   * @return the commission amount
+   */
   @Override
   public BigDecimal calculateCommission() {
     BigDecimal commissionRate = new BigDecimal("0.01");
     return calculateGross().multiply(commissionRate);
   }
 
+  /**
+   * Calculates the tax on the capital gain (22% of profit).
+   * Profit is defined as (sales price - purchase price) * quantity.
+   * If there is no profit, tax is zero (clamped by max(ZERO) in a robust implementation,
+   * but here we follow existing logic).
+   *
+   * @return the tax amount
+   */
   @Override
   public BigDecimal calculateTax() {
     BigDecimal taxRate = new BigDecimal("0.22");
-    BigDecimal differencePrice = salesPrice.subtract(purchasePrice);
-    BigDecimal difference = differencePrice.multiply(quantity);
-    return difference.multiply(taxRate);
+    BigDecimal priceDifference = salesPrice.subtract(purchasePrice);
+    BigDecimal totalProfit = priceDifference.multiply(quantity);
+    // Only tax if there is a profit
+    if (totalProfit.compareTo(BigDecimal.ZERO) <= 0) {
+      return BigDecimal.ZERO;
+    }
+    return totalProfit.multiply(taxRate);
   }
 
+  /**
+   * Calculates the net total received from the sale (gross - commission - tax).
+   *
+   * @return the net sale amount
+   */
   @Override
   public BigDecimal calculateTotal() {
     return calculateGross().subtract(calculateCommission()).subtract(calculateTax());

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Model/Exchange.java

@@ -19,19 +19,16 @@
  * </p>
  */
 public class Exchange {
-  private String name;
   private int week;
   private Map<String, Stock> stockMap;
   private Random random;
 
   /**
    * Constructs a new {@code Exchange} with a name and a list of stocks.
    *
-   * @param name the name of the exchange (e.g., "NYSE")
    * @param stocks the initial list of available stocks on the exchange
    */
-  public Exchange(String name, List<Stock> stocks) {
-    this.name = name;
+  public Exchange(List<Stock> stocks) {
     this.week = 0;
     this.stockMap = new HashMap<String, Stock>();
     this.random = new Random();
@@ -40,10 +37,6 @@ public Exchange(String name, List<Stock> stocks) {
     }
   }
 
-  public String getName() {
-    return name;
-  }
-
   public int getWeek() {
     return week;
   }
@@ -69,20 +62,33 @@ public Stock getStock(String symbol) {
   }
 
   /**
-   * Finds stocks by company name.
+   * Finds stocks by company name or symbol.
    *
-   * @param searchTerm the company name to search for
-   * @return a list of {@code Stock} objects whose company name matches the search term
+   * @param searchTerm the term to search for (case-insensitive)
+   * @return a list of {@code Stock} objects matching the search term, sorted alphabetically
    */
   public List<Stock> findStocks(String searchTerm) {
-    List<Stock> foundStocks = new ArrayList<>();
-
-    for (Stock stock : stockMap.values()) {
-      if (stock.getCompany().equals(searchTerm)) {
-        foundStocks.add(stock);
-      }
+    if (searchTerm == null || searchTerm.isBlank()) {
+      return getAllStocks();
     }
-    return foundStocks;
+
+    String lowerSearchTerm = searchTerm.toLowerCase();
+    return stockMap.values().stream()
+        .filter(stock -> stock.getCompany().toLowerCase().contains(lowerSearchTerm)
+            || stock.getSymbol().toLowerCase().contains(lowerSearchTerm))
+        .sorted((a, b) -> a.getCompany().compareToIgnoreCase(b.getCompany()))
+        .toList();
+  }
+
+  /**
+   * Returns all available stocks on the exchange, sorted alphabetically by company name.
+   *
+   * @return a sorted list of all {@code Stock} objects
+   */
+  public List<Stock> getAllStocks() {
+    return stockMap.values().stream()
+        .sorted((a, b) -> a.getCompany().compareToIgnoreCase(b.getCompany()))
+        .toList();
   }
 
   /**
@@ -97,33 +103,35 @@ public List<Stock> findStocks(String searchTerm) {
    * @return a {@code Purchase} transaction representing the purchase
    */
   public Transaction buy(String symbol, BigDecimal quantity, Player player) {
-    System.out.println("[DEBUG] Exchange " + name + " - Buying " + quantity + " of " + symbol + " for player " + player.getName());
-    player.withdrawMoney(quantity);
+    System.out.println("[DEBUG] Exchange" + " Buying " + quantity + " of " + symbol + " for player " + player.getName());
     Stock stock = getStock(symbol);
     BigDecimal purchasePrice =  stock.getSalesPrice();
+    player.withdrawMoney(quantity.multiply(purchasePrice));
 
     Share share = new Share(stock, quantity, purchasePrice);
     System.out.println("[DEBUG] Purchase complete: " + quantity + " shares of " + symbol + " at " + purchasePrice);
     return new Purchase(share, week);
   }
 
   /**
-   * Allows a player to sell a share on the exchange.
-   * <p>
-   * The player receives money based on the sale calculation, and a {@code Sale} transaction is returned.
-   * </p>
+   * Allows a player to sell a portion of a share position on the exchange.
    *
-   * @param share the share to sell
+   * @param share the share position from which to sell
+   * @param quantity the amount of stock to sell
    * @param player the player performing the sale
    * @return a sale transaction representing the sale
    */
-  public Transaction sell(Share share, Player player) {
-    System.out.println("[DEBUG] Exchange " + name + " - Selling shares of " + share.getStock().getSymbol() + " for player " + player.getName());
-    SaleCalculator saleCalculator = new SaleCalculator(share);
+  public Transaction sell(Share share, BigDecimal quantity, Player player) {
+    System.out.println("[DEBUG] Exchange - Selling " + quantity + " shares of "
+        + share.getStock().getSymbol() + " for player " + player.getName());
+
+    Share shareToSell = new Share(share.getStock(), quantity, share.getPurchasePrice());
+    SaleCalculator saleCalculator = new SaleCalculator(shareToSell);
     BigDecimal totalValue = saleCalculator.calculateTotal();
     player.addMoney(totalValue);
+
     System.out.println("[DEBUG] Sale complete: Received " + totalValue);
-    return new Sale(share, week);
+    return new Sale(shareToSell, week);
   }
 
   /**