Finishing Exchange methods, and spelling

src/main/java/temppackage/Exchange.java

@@ -1,6 +1,7 @@
 package temppackage;
 
 import java.math.BigDecimal;
+import java.math.RoundingMode;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -16,10 +17,15 @@ public Exchange(String name, List<Stock> stockList) {
     this.name = name;
     this.stocks = new HashMap<>();
     this.weekNumber = 1;
+
+    // Populate the stocks map to get ticker -> stock
+    for (Stock stock : stockList) {
+      this.stocks.put(stock.getSymbol(), stock);
+    }
   }
 
   public void buy(Player player, Stock stock, BigDecimal quantity) {
-    Share shareToBuy = new Share(stock, quantity, stock.getPrice());
+    Share shareToBuy = new Share(stock, quantity, stock.getSalesPrice());
     Purchase purchase = new Purchase(shareToBuy, this.weekNumber);
     purchase.commit(player);
   }
@@ -29,15 +35,34 @@ public void sell(Player player, Share share) {
     sale.commit(player);
   }
 
-  public void advance() {
-    this.weekNumber++;
-  }
-
   public Map<String, Stock> getStocks() {
     return this.stocks;
   }
 
-  public Stock geStock(String symbol) {
-    // filter med symbol eller company name
+  public Stock getStock(String symbol) {
+    return this.stocks.get(symbol);
+  }
+
+  public boolean hasStock(String symbol) {
+    return this.stocks.containsKey(symbol);
+  }
+
+  public List<Stock> findStocks(String searchTerm) {
+    return this.stocks.values().stream()
+        .filter(s -> s.getSymbol().contains(searchTerm) || s.getCompany().contains(searchTerm))
+        .toList();
+  }
+
+  public void advance() {
+    this.weekNumber++;
+    for (Stock stock : this.stocks.values()) {
+      double change = 0.9 + random.nextDouble() * 0.2;
+      stock.addNewSalesPrice(
+          stock
+              .getSalesPrice()
+              .multiply(BigDecimal.valueOf(change))
+              .setScale(2, RoundingMode.HALF_UP));
+      // RoundingMode from AI suggestion
+    }
   }
 }