feat(blackjack): add BlackJack game creation functionality

backend/requests/test.http

@@ -0,0 +1,7 @@
+POST http://localhost:8080/blackjack/start
+Authorization: Bearer {{token}}
+Content-Type: application/json
+
+{
+  "betAmount": 999
+}

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

@@ -0,0 +1,35 @@
+package de.szut.casino.blackjack;
+
+import de.szut.casino.blackjack.dto.CreateBlackJackGameDto;
+import de.szut.casino.user.UserService;
+import de.szut.casino.user.dto.CreateUserDto;
+import jakarta.validation.Valid;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RestController;
+
+@Slf4j
+@RestController
+public class BlackJackGameController {
+
+    @Autowired
+    private UserService userService;
+
+    @PostMapping("/blackjack/start")
+    public ResponseEntity<?> createBlackJackGame(@RequestBody @Valid CreateBlackJackGameDto gameData, @RequestHeader("Authorization") String token) {
+        if (gameData.getBetAmount() <= 0 || gameData.getBetAmount() > userService.getCurrentUser(token).getBalance().intValue()) {
+            return ResponseEntity.badRequest().body("Invalid bet amount");
+        }
+
+        BlackJackGameEntity game = new BlackJackGameEntity();
+        game.setBet(gameData.getBetAmount());
+        System.out.println("Balls: ");
+        System.out.println(game.getBet());
+        return null;
+    }
+}

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

@@ -0,0 +1,23 @@
+package de.szut.casino.blackjack;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.ArrayList;
+
+@Entity
+@Getter
+@Setter
+public class BlackJackGameEntity {
+    @Id
+    @GeneratedValue
+    private Long id;
+    private ArrayList<Card> playerHand;
+    private ArrayList<Card> dealerHand;
+    private ArrayList<Card> deck;
+    private String state;
+    private int bet;
+}

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

@@ -1,5 +1,6 @@
 package de.szut.casino.blackjack;
 
+
 import lombok.Getter;
 
 @Getter

backend/src/main/java/de/szut/casino/blackjack/dto/CreateBlackJackGameDto.java

@@ -0,0 +1,14 @@
+package de.szut.casino.blackjack.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class CreateBlackJackGameDto {
+    private int betAmount;
+}