Exchange class

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/Exchange.java

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+package edu.ntnu.idi.idatt2003.g40.mappe;
+
+import java.math.BigDecimal;
+import java.util.*;
+
+/**
+ * Represents a stock exchange where stocks can be traded.
+ */
+public class Exchange {
+
+    private final String name;
+    private int week;
+    private final Map<String, Stock> stockMap;
+    private final Random random;
+
+    public Exchange(String name, List<Stock> stocks) {
+        this.name = name;
+        this.week = 1;
+        this.stockMap = new HashMap<>();
+        this.random = new Random();
+
+        for (Stock stock : stocks) {
+            stockMap.put(stock.getSymbol(), stock);
+        }
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getWeek() {
+        return week;
+    }
+
+    public boolean hasStock(String symbol) {
+        return stockMap.containsKey(symbol);
+    }
+
+    public Stock getStock(String symbol) {
+        return stockMap.get(symbol);
+    }
+
+    public List<Stock> findStocks(String searchTerm) {
+        List<Stock> result = new ArrayList<>();
+        for (Stock stock : stockMap.values()) {
+            if (stock.getSymbol().toLowerCase().contains(searchTerm.toLowerCase())
+                    || stock.getCompany().toLowerCase().contains(searchTerm.toLowerCase())) {
+                result.add(stock);
+            }
+        }
+        return result;
+    }
+
+    public Transaction buy(String symbol, BigDecimal quantity, Player player) {
+        Stock stock = stockMap.get(symbol);
+        Share share = new Share(stock, quantity, stock.getSalesPrice());
+        TransactionCalculator calculator = new PurchaseCalculator(share);
+        return new Purchase(share, week, calculator, player);
+    }
+
+    public Transaction sell(Share share, Player player) {
+        TransactionCalculator calculator = new SaleCalculator(share);
+        return new Sale(share, week, calculator, player);
+    }
+
+     * Advances the exchange to the next week and updates stock prices.
+     */
+    public void advance() {
+        week++;
+
+        for (Stock stock : stockMap.values()) {
+            BigDecimal currentPrice = stock.getSalesPrice();
+
+            double change = (random.nextDouble() * 0.10) - 0.05;
+            BigDecimal factor = BigDecimal.valueOf(1 + change);
+
+            BigDecimal newPrice = currentPrice.multiply(factor);
+            stock.addNewSalesPrice(newPrice);
+        }
+    }
+}