Merge pull request 'feat: add balance when player wins with blackjack in first round' (!104) from feat/blackjack-win-on-start into main

Reviewed-on: #104
Reviewed-by: Jan K9f <jan@kjan.email>

backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java

@@ -42,8 +42,15 @@ public class BlackJackService {
         dealerCard.setCardType(CardType.DEALER);
         game.getDealerCards().add(dealerCard);
 
-        game.setState(getState(game));
-        user.setBalance(user.getBalance().subtract(betAmount));
+        BlackJackState state = getState(game);
+        if (state == BlackJackState.PLAYER_BLACKJACK) {
+            BigDecimal blackjackWinnings = betAmount.multiply(new BigDecimal("1.5"));
+            user.setBalance(user.getBalance().add(blackjackWinnings));
+        } else {
+            user.setBalance(user.getBalance().subtract(betAmount));
+        }
+
+        game.setState(state);
 
         userRepository.save(user);
         blackJackGameRepository.save(game);
@@ -88,7 +95,7 @@ public class BlackJackService {
         int playerHandValue = calculateHandValue(game.getPlayerCards());
 
         if (playerHandValue == 21) {
-            return BlackJackState.PLAYER_WON;
+            return BlackJackState.PLAYER_BLACKJACK;
         } else if (playerHandValue > 21) {
             return BlackJackState.PLAYER_LOST;
         }

backend/src/main/java/de/szut/casino/blackjack/BlackJackState.java

@@ -1,7 +1,7 @@
 package de.szut.casino.blackjack;
 
 public enum BlackJackState {
-    PLAYER_WON,
     IN_PROGRESS,
+    PLAYER_BLACKJACK,
     PLAYER_LOST,
 }