Merge pull request 'feat: add deck to blackjack game instead of random cards' (!96) from feat/deck into main

Reviewed-on: #96
Reviewed-by: Jan K9f <jan@kjan.email>

README.md

@@ -67,6 +67,11 @@ cd backend
 ./gradlew bootRun
 ```
 
+You may optionally install [watchexec](https://github.com/watchexec/watchexec?tab=readme-ov-file) and use this command to autorecompile the backend on file changes:
+```bash
+watchexec -r -e java ./gradlew :bootRun
+```
+
 The backend will be available at:
 - API endpoint: http://localhost:8080
 - Swagger documentation: http://localhost:8080/swagger
@@ -164,4 +169,4 @@ References:
 
 ## License
 
-This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

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

@@ -36,6 +36,10 @@ public class BlackJackGameEntity {
     private String state;
     private BigDecimal bet;
 
+    @OneToMany(mappedBy = "game", cascade = CascadeType.ALL, orphanRemoval = true)
+    @JsonIgnore
+    private List<CardEntity> deck = new ArrayList<>();
+
     @OneToMany(mappedBy = "game", cascade = CascadeType.ALL, orphanRemoval = true)
     @JsonManagedReference
     private List<CardEntity> playerCards = new ArrayList<>();

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

@@ -24,13 +24,14 @@ public class BlackJackService {
         game.setUser(user);
         game.setBet(betAmount);
         game.setState("IN_PROGRESS");
+        initializeDeck(game);
 
         for (int i = 0; i < 2; i++) {
-            CardEntity playerCard = createRandomCard(game);
+            CardEntity playerCard = drawCardFromDeck(game);
             game.getPlayerCards().add(playerCard);
         }
 
-        CardEntity dealerCard = createRandomCard(game);
+        CardEntity dealerCard = drawCardFromDeck(game);
         game.getDealerCards().add(dealerCard);
 
         user.setBalance(user.getBalance().subtract(betAmount));
@@ -41,11 +42,25 @@ public class BlackJackService {
         return game;
     }
 
-    private CardEntity createRandomCard(BlackJackGameEntity game) {
-        CardEntity card = new CardEntity();
-        card.setGame(game);
-        card.setSuit(Suit.values()[random.nextInt(Suit.values().length)]);
-        card.setRank(Rank.values()[random.nextInt(Rank.values().length)]);
-        return card;
+    private void initializeDeck(BlackJackGameEntity game) {
+        for (Suit suit : Suit.values()) {
+            for (Rank rank : Rank.values()) {
+                CardEntity card = new CardEntity();
+                card.setGame(game);
+                card.setSuit(suit);
+                card.setRank(rank);
+                game.getDeck().add(card);
+            }
+        }
+
+        java.util.Collections.shuffle(game.getDeck(), random);
+    }
+
+    private CardEntity drawCardFromDeck(BlackJackGameEntity game) {
+        if (game.getDeck().isEmpty()) {
+            throw new IllegalStateException("Deck is empty");
+        }
+
+        return game.getDeck().removeFirst();
     }
 }