Feat: Fixed clicker game

Fixed bug where player could buy upgrade even if they did not have enough score, by adding an internal reference to score in the clicker game game.

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/minigames/games/ClickerGame.java

@@ -25,6 +25,11 @@ public final class ClickerGame
    * */
   private int clickValue;
 
+  /**
+   * Local reference to current score.
+   */
+  private int score;
+
   /**
    * The current cost of upgrading the amount gained per click.
    * */
@@ -71,17 +76,22 @@ public Node getCanvasNode() {
 
   @Override
   public void initialize(final IntConsumer scoreModifier) {
-
-    clickBtn.setOnAction(e -> scoreModifier.accept(clickValue));
+    score = 0;
+    clickBtn.setOnAction(e ->  {
+      scoreModifier.accept(clickValue);
+      score += clickValue;
+    });
 
     upgradeBtn.setOnAction(e -> {
-      // TODO: Change validation to only upgrade if enough score.
       scoreModifier.accept(-upgradeCost);
-      clickValue += 1;
-      upgradeCost *= 2;
-      clickBtn.setText("+" + clickValue);
-      upgradeBtn.setText("+" + clickValue + " per click\n-"
-              + upgradeCost + " points");
+      if (upgradeCost <= score) {
+        score -= upgradeCost;
+        clickValue += 1;
+        upgradeCost *= 2;
+        clickBtn.setText("+" + clickValue);
+        upgradeBtn.setText("+1 per click\n-"
+                + upgradeCost + " points");
+      }
     });
   }