Merge branch 'main' into feature/authentik

README.md

@@ -2,7 +2,7 @@
 
 An online gaming platform offering various casino-style games with virtual currency support. This project features a modern tech stack with Angular frontend, Spring Boot backend, and complete user authentication.
 
-Please refer to our [Style Guide](/frontend/README.md#style-guide) for design guidelines and component standards.
+Please refer to our [Style Guide](https://git.kjan.de/SZUT/casino/wiki/Frontend#design-system) for design guidelines and component standards.
 
 ## Features
 
@@ -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

backend/build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
     java
-    id("org.springframework.boot") version "3.4.3"
+    id("org.springframework.boot") version "3.4.4"
     id("io.spring.dependency-management") version "1.1.7"
     id("checkstyle")
 }
@@ -39,7 +39,7 @@ repositories {
 }
 
 dependencies {
-    implementation("com.stripe:stripe-java:20.136.0")
+    implementation("com.stripe:stripe-java:29.0.0")
     implementation("org.springframework.boot:spring-boot-starter-data-jpa")
     implementation("org.springframework.boot:spring-boot-starter-web")
     compileOnly("org.projectlombok:lombok")
@@ -47,10 +47,10 @@ dependencies {
     testImplementation("org.springframework.boot:spring-boot-starter-test")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
     implementation("org.springframework.boot:spring-boot-starter-security")
-    implementation("org.springframework.boot:spring-boot-starter-oauth2-resource-server")
+    implementation("org.springframework.boot:spring-boot-starter-oauth2-resource-server:3.4.4")
-    implementation("org.springframework.security:spring-security-oauth2-jose")
+    implementation("org.springframework.boot:spring-boot-starter-oauth2-client:3.4.4")
     runtimeOnly("org.postgresql:postgresql")
-    implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.5")
+    implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.6")
 }
 
 tasks.withType<Test> {

backend/requests/blackjack.http

@@ -0,0 +1,20 @@
+POST http://localhost:8080/blackjack/start
+Authorization: Bearer {{token}}
+Content-Type: application/json
+
+{
+  "betAmount": 1.01
+}
+
+###
+POST http://localhost:8080/blackjack/54/hit
+Authorization: Bearer {{token}}
+
+###
+POST http://localhost:8080/blackjack/202/stand
+Authorization: Bearer {{token}}
+
+###
+GET http://localhost:8080/blackjack/202
+Authorization: Bearer {{token}}
+

backend/requests/getBearerToken.http

@@ -1,6 +1,6 @@
 POST http://localhost:9090/realms/LF12/protocol/openid-connect/token
 Content-Type: application/x-www-form-urlencoded
 
-grant_type=password&client_id=lf12&username=lf12_test_user&password=secret
+grant_type=password&client_id=lf12&username=lf12_test_user&password=secret&scope=openid
 
 > {% client.global.set("token", response.body.access_token); %}

backend/requests/lootboxes.http

@@ -0,0 +1,9 @@
+GET http://localhost:8080/lootboxes
+Authorization: Bearer {{token}}
+Content-Type: application/json
+
+###
+
+POST http://localhost:8080/lootboxes/2
+Authorization: Bearer {{token}}
+Content-Type: application/json

backend/src/main/java/de/szut/casino/CasinoApplication.java

@@ -1,10 +1,20 @@
 package de.szut.casino;
 
+import de.szut.casino.lootboxes.LootBoxEntity;
+import de.szut.casino.lootboxes.LootBoxRepository;
+import de.szut.casino.lootboxes.RewardEntity;
+import de.szut.casino.lootboxes.RewardRepository;
+import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
 import org.springframework.web.client.RestTemplate;
 
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 @SpringBootApplication
 public class CasinoApplication {
 
@@ -16,4 +26,65 @@ public class CasinoApplication {
     public static RestTemplate restTemplate() {
         return new RestTemplate();
     }
+
+    @Bean
+    public CommandLineRunner initData(LootBoxRepository lootBoxRepository, RewardRepository rewardRepository) {
+        return _ -> {
+            if (lootBoxRepository.count() == 0) {
+                LootBoxEntity basicLootBox = new LootBoxEntity();
+                basicLootBox.setName("Basic LootBox");
+                basicLootBox.setPrice(new BigDecimal("2"));
+                basicLootBox.setRewards(new ArrayList<>()); // Initialize the list
+
+                LootBoxEntity premiumLootBox = new LootBoxEntity();
+                premiumLootBox.setName("Premium LootBox");
+                premiumLootBox.setPrice(new BigDecimal("5"));
+                premiumLootBox.setRewards(new ArrayList<>()); // Initialize the list
+
+                lootBoxRepository.saveAll(Arrays.asList(basicLootBox, premiumLootBox));
+
+                RewardEntity commonReward = new RewardEntity();
+                commonReward.setValue(new BigDecimal("0.50"));
+                commonReward.setProbability(new BigDecimal("0.7"));
+
+                RewardEntity rareReward = new RewardEntity();
+                rareReward.setValue(new BigDecimal("2.00"));
+                rareReward.setProbability(new BigDecimal("0.25"));
+
+                RewardEntity epicReward = new RewardEntity();
+                epicReward.setValue(new BigDecimal("5.00"));
+                epicReward.setProbability(new BigDecimal("0.5"));
+
+                RewardEntity premiumCommon = new RewardEntity();
+                premiumCommon.setValue(new BigDecimal("2.00"));
+                premiumCommon.setProbability(new BigDecimal("0.6"));
+
+                RewardEntity premiumRare = new RewardEntity();
+                premiumRare.setValue(new BigDecimal("5.00"));
+                premiumRare.setProbability(new BigDecimal("0.3"));
+
+                RewardEntity legendaryReward = new RewardEntity();
+                legendaryReward.setValue(new BigDecimal("15.00"));
+                legendaryReward.setProbability(new BigDecimal("0.10"));
+
+                rewardRepository.saveAll(Arrays.asList(
+                        commonReward, rareReward, epicReward,
+                        premiumCommon, premiumRare, legendaryReward
+                ));
+
+                basicLootBox.getRewards().add(commonReward);
+                basicLootBox.getRewards().add(premiumRare);
+
+                premiumLootBox.getRewards().add(premiumCommon);
+                premiumLootBox.getRewards().add(premiumRare);
+                premiumLootBox.getRewards().add(legendaryReward);
+
+                lootBoxRepository.saveAll(Arrays.asList(basicLootBox, premiumLootBox));
+
+                System.out.println("Initial LootBoxes and rewards created successfully");
+            } else {
+                System.out.println("LootBoxes already exist, skipping initialization");
+            }
+        };
+    }
 }

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

@@ -0,0 +1,140 @@
+package de.szut.casino.blackjack;
+
+import de.szut.casino.blackjack.dto.CreateBlackJackGameDto;
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserService;
+import jakarta.validation.Valid;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.math.BigDecimal;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+
+@Slf4j
+@RestController
+public class BlackJackGameController {
+
+    private final UserService userService;
+    private final BlackJackService blackJackService;
+
+    public BlackJackGameController(UserService userService, BlackJackService blackJackService) {
+        this.blackJackService = blackJackService;
+        this.userService = userService;
+    }
+
+    @GetMapping("/blackjack/{id}")
+    public ResponseEntity<Object> getGame(@PathVariable Long id, @RequestHeader("Authorization") String token) {
+        Optional<UserEntity> optionalUser = userService.getCurrentUser(token);
+
+        if (optionalUser.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        UserEntity user = optionalUser.get();
+        BlackJackGameEntity game = blackJackService.getBlackJackGame(id);
+        if (game == null || !Objects.equals(game.getUserId(), user.getId())) {
+            return ResponseEntity.notFound().build();
+        }
+
+        return ResponseEntity.ok(game);
+    }
+
+    @PostMapping("/blackjack/{id}/hit")
+    public ResponseEntity<Object> hit(@PathVariable Long id, @RequestHeader("Authorization") String token) {
+        Optional<UserEntity> optionalUser = userService.getCurrentUser(token);
+
+        if (optionalUser.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        UserEntity user = optionalUser.get();
+        BlackJackGameEntity game = blackJackService.getBlackJackGame(id);
+        if (game == null || !Objects.equals(game.getUserId(), user.getId())) {
+            return ResponseEntity.notFound().build();
+        }
+
+        return ResponseEntity.ok(blackJackService.hit(game));
+    }
+
+    @PostMapping("/blackjack/{id}/stand")
+    public ResponseEntity<Object> stand(@PathVariable Long id, @RequestHeader("Authorization") String token) {
+        Optional<UserEntity> optionalUser = userService.getCurrentUser(token);
+
+        if (optionalUser.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        UserEntity user = optionalUser.get();
+        BlackJackGameEntity game = blackJackService.getBlackJackGame(id);
+        if (game == null || !Objects.equals(game.getUserId(), user.getId())) {
+            return ResponseEntity.notFound().build();
+        }
+
+        return ResponseEntity.ok(blackJackService.stand(game));
+    }
+
+    @PostMapping("/blackjack/{id}/doubleDown")
+    public ResponseEntity<Object> doubleDown(@PathVariable Long id, @RequestHeader("Authorization") String token) {
+        Optional<UserEntity> optionalUser = userService.getCurrentUser(token);
+
+        if (optionalUser.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        UserEntity user = optionalUser.get();
+        BlackJackGameEntity game = blackJackService.getBlackJackGame(id);
+        if (game == null || !Objects.equals(game.getUserId(), user.getId())) {
+            return ResponseEntity.notFound().build();
+        }
+
+        return ResponseEntity.ok(blackJackService.doubleDown(game));
+    }
+
+    @PostMapping("/blackjack/{id}/split")
+    public ResponseEntity<Object> split(@PathVariable Long id, @RequestHeader("Authorization") String token) {
+        Optional<UserEntity> optionalUser = userService.getCurrentUser(token);
+
+        if (optionalUser.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        UserEntity user = optionalUser.get();
+        BlackJackGameEntity game = blackJackService.getBlackJackGame(id);
+        if (game == null || !Objects.equals(game.getUserId(), user.getId())) {
+            return ResponseEntity.notFound().build();
+        }
+
+        return ResponseEntity.ok(blackJackService.split(game));
+    }
+
+    @PostMapping("/blackjack/start")
+    public ResponseEntity<Object> createBlackJackGame(@RequestBody @Valid CreateBlackJackGameDto createBlackJackGameDto, @RequestHeader("Authorization") String token) {
+        Optional<UserEntity> optionalUser = userService.getCurrentUser(token);
+
+        if (optionalUser.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        UserEntity user = optionalUser.get();
+        BigDecimal balance = user.getBalance();
+        BigDecimal betAmount = createBlackJackGameDto.getBetAmount();
+
+        if (betAmount.compareTo(BigDecimal.ZERO) <= 0) {
+            Map<String, String> errorResponse = new HashMap<>();
+            errorResponse.put("error", "Invalid bet amount");
+            return ResponseEntity.badRequest().body(errorResponse);
+        }
+
+        if (betAmount.compareTo(balance) > 0) {
+            Map<String, String> errorResponse = new HashMap<>();
+            errorResponse.put("error", "Insufficient funds");
+            return ResponseEntity.badRequest().body(errorResponse);
+        }
+
+        return ResponseEntity.ok(blackJackService.createBlackJackGame(user, betAmount));
+    }
+}

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

@@ -0,0 +1,65 @@
+package de.szut.casino.blackjack;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+import de.szut.casino.user.UserEntity;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.hibernate.annotations.SQLRestriction;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class BlackJackGameEntity {
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id", nullable = false)
+    @JsonIgnore
+    private UserEntity user;
+
+    public Long getUserId() {
+        return user != null ? user.getId() : null;
+    }
+
+    @Enumerated(EnumType.STRING)
+    private BlackJackState state;
+    private BigDecimal bet;
+
+    @OneToMany(mappedBy = "game", cascade = CascadeType.ALL, orphanRemoval = true)
+    @JsonIgnore
+    @SQLRestriction("card_type = 'DECK'")
+    private List<CardEntity> deck = new ArrayList<>();
+
+    @OneToMany(mappedBy = "game", cascade = CascadeType.ALL, orphanRemoval = true)
+    @JsonManagedReference
+    @SQLRestriction("card_type = 'PLAYER'")
+    private List<CardEntity> playerCards = new ArrayList<>();
+
+    @OneToMany(mappedBy = "game", cascade = CascadeType.ALL, orphanRemoval = true)
+    @JsonManagedReference
+    @SQLRestriction("card_type = 'DEALER'")
+    private List<CardEntity> dealerCards = new ArrayList<>();
+
+    @OneToMany(mappedBy = "game", cascade = CascadeType.ALL, orphanRemoval = true)
+    @JsonManagedReference
+    @SQLRestriction("card_type = 'PLAYER_SPLIT'")
+    private List<CardEntity> playerSplitCards = new ArrayList<>();
+
+    @Column(name = "split_bet")
+    private BigDecimal splitBet;
+
+    @Column(name = "is_split")
+    private boolean isSplit;
+}

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

@@ -0,0 +1,12 @@
+package de.szut.casino.blackjack;
+
+import de.szut.casino.user.UserEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+@Service
+public interface BlackJackGameRepository extends JpaRepository<BlackJackGameEntity, Long> {
+}

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

@@ -0,0 +1,310 @@
+package de.szut.casino.blackjack;
+
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserRepository;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Optional;
+import java.util.Random;
+
+@Service
+public class BlackJackService {
+    private final BlackJackGameRepository blackJackGameRepository;
+    private final UserRepository userRepository;
+    private final Random random = new Random();
+
+    public BlackJackService(BlackJackGameRepository blackJackGameRepository, UserRepository userRepository) {
+        this.blackJackGameRepository = blackJackGameRepository;
+        this.userRepository = userRepository;
+    }
+
+    public BlackJackGameEntity getBlackJackGame(Long id) {
+        return blackJackGameRepository.findById(id).orElse(null);
+    }
+
+    @Transactional
+    public BlackJackGameEntity createBlackJackGame(UserEntity user, BigDecimal betAmount) {
+        BlackJackGameEntity game = new BlackJackGameEntity();
+        game.setUser(user);
+        game.setBet(betAmount);
+        
+        initializeDeck(game);
+        dealInitialCards(game);
+        
+        game.setState(getState(game));
+        deductBetFromBalance(user, betAmount);
+        
+        return blackJackGameRepository.save(game);
+    }
+
+    @Transactional
+    public BlackJackGameEntity hit(BlackJackGameEntity game) {
+        if (game.getState() != BlackJackState.IN_PROGRESS) {
+            return game;
+        }
+        
+        dealCardToPlayer(game);
+        
+        updateGameStateAndBalance(game);
+        
+        return blackJackGameRepository.save(game);
+    }
+
+    @Transactional
+    public BlackJackGameEntity stand(BlackJackGameEntity game) {
+        if (game.getState() != BlackJackState.IN_PROGRESS) {
+            return game;
+        }
+        
+        dealCardsToDealerUntilMinimumScore(game);
+        determineWinnerAndUpdateBalance(game);
+        
+        return blackJackGameRepository.save(game);
+    }
+
+    @Transactional
+    public BlackJackGameEntity doubleDown(BlackJackGameEntity game) {
+        if (game.getState() != BlackJackState.IN_PROGRESS || game.getPlayerCards().size() != 2) {
+            return game;
+        }
+        
+        UserEntity user = getUserWithFreshData(game.getUser());
+        BigDecimal additionalBet = game.getBet();
+        
+        deductBetFromBalance(user, additionalBet);
+        game.setBet(game.getBet().add(additionalBet));
+        
+        dealCardToPlayer(game);
+        updateGameStateAndBalance(game);
+        
+        if (game.getState() == BlackJackState.IN_PROGRESS) {
+            return stand(game);
+        }
+        
+        return game;
+    }
+
+    @Transactional
+    public BlackJackGameEntity split(BlackJackGameEntity game) {
+        if (game.getState() != BlackJackState.IN_PROGRESS || 
+            game.getPlayerCards().size() != 2 || 
+            game.isSplit() ||
+            !game.getPlayerCards().get(0).getRank().equals(game.getPlayerCards().get(1).getRank())) {
+            return game;
+        }
+        
+        UserEntity user = getUserWithFreshData(game.getUser());
+        BigDecimal splitBet = game.getBet();
+        
+        if (user.getBalance().compareTo(splitBet) < 0) {
+            return game;
+        }
+        
+        deductBetFromBalance(user, splitBet);
+        game.setSplitBet(splitBet);
+        game.setSplit(true);
+        
+        CardEntity card = game.getPlayerCards().remove(1);
+        card.setCardType(CardType.PLAYER_SPLIT);
+        game.getPlayerSplitCards().add(card);
+        
+        dealCardToPlayer(game);
+        dealCardToSplitHand(game);
+        
+        return blackJackGameRepository.save(game);
+    }
+
+    private BlackJackGameEntity refreshGameState(BlackJackGameEntity game) {
+        return blackJackGameRepository.findById(game.getId()).orElse(game);
+    }
+    
+    private UserEntity getUserWithFreshData(UserEntity user) {
+        return userRepository.findById(user.getId()).orElse(user);
+    }
+    
+    private void dealInitialCards(BlackJackGameEntity game) {
+        for (int i = 0; i < 2; i++) {
+            dealCardToPlayer(game);
+        }
+        
+        dealCardToDealer(game);
+    }
+    
+    private void dealCardToPlayer(BlackJackGameEntity game) {
+        CardEntity card = drawCardFromDeck(game);
+        card.setCardType(CardType.PLAYER);
+        game.getPlayerCards().add(card);
+    }
+    
+    private void dealCardToDealer(BlackJackGameEntity game) {
+        CardEntity card = drawCardFromDeck(game);
+        card.setCardType(CardType.DEALER);
+        game.getDealerCards().add(card);
+    }
+    
+    private void dealCardsToDealerUntilMinimumScore(BlackJackGameEntity game) {
+        while (calculateHandValue(game.getDealerCards()) < 17) {
+            dealCardToDealer(game);
+        }
+    }
+    
+    private void dealCardToSplitHand(BlackJackGameEntity game) {
+        CardEntity card = drawCardFromDeck(game);
+        card.setCardType(CardType.PLAYER_SPLIT);
+        game.getPlayerSplitCards().add(card);
+    }
+    
+    private void updateGameStateAndBalance(BlackJackGameEntity game) {
+        if (game.isSplit()) {
+            int mainHandValue = calculateHandValue(game.getPlayerCards());
+            int splitHandValue = calculateHandValue(game.getPlayerSplitCards());
+            
+            if (mainHandValue > 21 && splitHandValue > 21) {
+                game.setState(BlackJackState.PLAYER_LOST);
+                updateUserBalance(game, false);
+            } else if (mainHandValue <= 21 && splitHandValue <= 21) {
+                game.setState(BlackJackState.IN_PROGRESS);
+            } else {
+                game.setState(BlackJackState.IN_PROGRESS);
+            }
+        } else {
+            game.setState(getState(game));
+            
+            if (game.getState() == BlackJackState.PLAYER_WON) {
+                updateUserBalance(game, true);
+            } else if (game.getState() == BlackJackState.PLAYER_LOST) {
+                updateUserBalance(game, false);
+            }
+        }
+    }
+    
+    private void determineWinnerAndUpdateBalance(BlackJackGameEntity game) {
+        int playerValue = calculateHandValue(game.getPlayerCards());
+        int dealerValue = calculateHandValue(game.getDealerCards());
+
+        if (dealerValue > 21 || playerValue > dealerValue) {
+            game.setState(BlackJackState.PLAYER_WON);
+            updateUserBalance(game, true);
+        } else if (playerValue < dealerValue) {
+            game.setState(BlackJackState.PLAYER_LOST);
+            updateUserBalance(game, false);
+        } else {
+            game.setState(BlackJackState.DRAW);
+            updateUserBalance(game, false);
+        }
+    }
+    
+    private void deductBetFromBalance(UserEntity user, BigDecimal betAmount) {
+        user.setBalance(user.getBalance().subtract(betAmount));
+        userRepository.save(user);
+    }
+
+    @Transactional
+    private void updateUserBalance(BlackJackGameEntity game, boolean isWin) {
+        UserEntity user = getUserWithFreshData(game.getUser());
+        BigDecimal totalBet = game.getBet();
+        BigDecimal balance = user.getBalance();
+        
+        if (game.isSplit()) {
+            totalBet = totalBet.add(game.getSplitBet());
+            
+            if (isWin) {
+                int mainHandValue = calculateHandValue(game.getPlayerCards());
+                int splitHandValue = calculateHandValue(game.getPlayerSplitCards());
+                int dealerValue = calculateHandValue(game.getDealerCards());
+                
+                if (mainHandValue <= 21 && (dealerValue > 21 || mainHandValue > dealerValue)) {
+                    balance = balance.add(game.getBet().multiply(BigDecimal.valueOf(2)));
+                } else if (mainHandValue == dealerValue) {
+                    balance = balance.add(game.getBet());
+                }
+                
+                if (splitHandValue <= 21 && (dealerValue > 21 || splitHandValue > dealerValue)) {
+                    balance = balance.add(game.getSplitBet().multiply(BigDecimal.valueOf(2)));
+                } else if (splitHandValue == dealerValue) {
+                    balance = balance.add(game.getSplitBet());
+                }
+            } else if (game.getState() == BlackJackState.DRAW) {
+                balance = balance.add(totalBet);
+            }
+        } else {
+            if (isWin) {
+                balance = balance.add(totalBet.multiply(BigDecimal.valueOf(2)));
+            } else if (game.getState() == BlackJackState.DRAW) {
+                balance = balance.add(totalBet);
+            }
+        }
+        
+        user.setBalance(balance);
+        userRepository.save(user);
+    }
+
+    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);
+                card.setCardType(CardType.DECK);
+                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();
+    }
+
+    private BlackJackState getState(BlackJackGameEntity game) {
+        int playerHandValue = calculateHandValue(game.getPlayerCards());
+
+        if (playerHandValue == 21) {
+            CardEntity hole = drawCardFromDeck(game);
+            hole.setCardType(CardType.DEALER);
+            game.getDealerCards().add(hole);
+
+            int dealerHandValue = calculateHandValue(game.getDealerCards());
+
+            if (dealerHandValue == 21) {
+                return BlackJackState.DRAW;
+            } else {
+                BigDecimal blackjackWinnings = game.getBet().multiply(new BigDecimal("1.5"));
+                UserEntity user = getUserWithFreshData(game.getUser());
+                user.setBalance(user.getBalance().add(blackjackWinnings));
+                return BlackJackState.PLAYER_BLACKJACK;
+            }
+        } else if (playerHandValue > 21) {
+            return BlackJackState.PLAYER_LOST;
+        }
+
+        return BlackJackState.IN_PROGRESS;
+    }
+
+    private int calculateHandValue(List<CardEntity> hand) {
+        int sum = 0;
+        int aceCount = 0;
+        for (CardEntity card : hand) {
+            sum += card.getRank().getValue();
+            if (card.getRank() == Rank.ACE) {
+                aceCount++;
+            }
+        }
+
+        while (sum > 21 && aceCount > 0) {
+            sum -= 10;
+            aceCount--;
+        }
+
+        return sum;
+    }
+}

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

@@ -0,0 +1,9 @@
+package de.szut.casino.blackjack;
+
+public enum BlackJackState {
+    IN_PROGRESS,
+    PLAYER_BLACKJACK,
+    PLAYER_LOST,
+    PLAYER_WON,
+    DRAW,
+}

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

@@ -0,0 +1,40 @@
+package de.szut.casino.blackjack;
+
+import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Entity
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class CardEntity {
+    @Id
+    @GeneratedValue
+    @JsonIgnore
+    private Long id;
+
+    @ManyToOne
+    @JoinColumn(name = "game_id", nullable = false)
+    @JsonBackReference
+    private BlackJackGameEntity game;
+
+    @Enumerated(EnumType.STRING)
+    private Suit suit;
+
+    @Enumerated(EnumType.STRING)
+    private Rank rank;
+
+    @Enumerated(EnumType.STRING)
+    @JsonIgnore
+    private CardType cardType;
+}
+
+enum CardType {
+    DECK, PLAYER, DEALER, PLAYER_SPLIT
+}

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

@@ -0,0 +1,31 @@
+package de.szut.casino.blackjack;
+
+import lombok.Getter;
+
+@Getter
+public enum Rank {
+    TWO("2", "Two", 2),
+    THREE("3", "Three", 3),
+    FOUR("4", "Four", 4),
+    FIVE("5", "Five", 5),
+    SIX("6", "Six", 6),
+    SEVEN("7", "Seven", 7),
+    EIGHT("8", "Eight", 8),
+    NINE("9", "Nine", 9),
+    TEN("10", "Ten", 10),
+    JACK("J", "Jack", 10),
+    QUEEN("Q", "Queen", 10),
+    KING("K", "King", 10),
+    ACE("A", "Ace", 11);
+
+    private final String symbol;
+    private final String displayName;
+    private final int value;
+
+    Rank(String symbol, String displayName, int value) {
+        this.symbol = symbol;
+        this.displayName = displayName;
+        this.value = value;
+    }
+
+}

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

@@ -0,0 +1,20 @@
+package de.szut.casino.blackjack;
+
+import lombok.Getter;
+
+@Getter
+public enum Suit {
+    HEARTS("H", "Hearts"),
+    DIAMONDS("D", "Diamonds"),
+    CLUBS("C", "Clubs"),
+    SPADES("S", "Spades");
+
+    private final String symbol;
+    private final String displayName;
+
+    Suit(String symbol, String displayName) {
+        this.symbol = symbol;
+        this.displayName = displayName;
+    }
+
+}

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

@@ -0,0 +1,16 @@
+package de.szut.casino.blackjack.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import java.math.BigDecimal;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class CreateBlackJackGameDto {
+    private BigDecimal betAmount;
+}

backend/src/main/java/de/szut/casino/deposit/DepositController.java

@@ -52,11 +52,15 @@ public class DepositController {
 
         SessionCreateParams params = SessionCreateParams.builder()
                 .addLineItem(SessionCreateParams.LineItem.builder()
-                        .setAmount((long) amountDto.getAmount() * 100)
+                        .setPriceData(SessionCreateParams.LineItem.PriceData.builder()
                                 .setCurrency("EUR")
-                        .setQuantity(1L)
+                                .setUnitAmount((long) amountDto.getAmount() * 100)
+                                .setProductData(SessionCreateParams.LineItem.PriceData.ProductData.builder()
                                         .setName("Einzahlung")
                                         .build())
+                                .build())
+                        .setQuantity(1L)
+                        .build())
                 .setSuccessUrl(frontendHost+"/home?success=true")
                 .setCancelUrl(frontendHost+"/home?success=false")
                 .setMode(SessionCreateParams.Mode.PAYMENT)

backend/src/main/java/de/szut/casino/deposit/TransactionService.java

@@ -40,7 +40,7 @@ public class TransactionService {
                 .build();
         Session checkoutSession = Session.retrieve(sessionID, params, null);
 
-        if (!Objects.equals(checkoutSession.getPaymentStatus(), "paid")) {
+        if (!"paid".equals(checkoutSession.getPaymentStatus())) {
             return;
         }
 
@@ -53,10 +53,12 @@ public class TransactionService {
         transaction.setStatus(TransactionStatus.SUCCEEDED);
 
         UserEntity user = transaction.getUser();
-        user.addBalance(checkoutSession.getAmountTotal());
+        Long amountTotal = checkoutSession.getAmountTotal();
+        if (amountTotal != null) {
+            user.addBalance(amountTotal);
+        }
 
         userRepository.save(user);
         transactionRepository.save(transaction);
     }
-
 }

backend/src/main/java/de/szut/casino/deposit/WebhookController.java

@@ -51,12 +51,18 @@ public class WebhookController {
         switch (event.getType()) {
             case "checkout.session.completed":
             case "checkout.session.async_payment_succeeded":
-                Session session = (Session) event.getData().getObject();
+                EventDataObjectDeserializer dataObjectDeserializer = event.getDataObjectDeserializer();
                 
+                if (dataObjectDeserializer.getObject().isPresent()) {
+                    Session session = (Session) dataObjectDeserializer.getObject().get();
                     this.transactionService.fulfillCheckout(session.getId());
+                } else {
+                    logger.error("Failed to deserialize webhook event data");
+                }
                 break;
             default:
-
+                // No action needed for other event types
+                break;
         }
 
         return ResponseEntity.ok().body(null);

backend/src/main/java/de/szut/casino/lootboxes/LootBoxController.java

@@ -0,0 +1,58 @@
+package de.szut.casino.lootboxes;
+
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserRepository;
+import de.szut.casino.user.UserService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+@RestController
+public class LootBoxController {
+    private final LootBoxRepository lootBoxRepository;
+    private final UserService userService;
+    private final LootBoxService lootBoxService;
+
+    public LootBoxController(LootBoxRepository lootBoxRepository, UserRepository userRepository, UserService userService, LootBoxService lootBoxService) {
+        this.lootBoxRepository = lootBoxRepository;
+        this.userService = userService;
+        this.lootBoxService = lootBoxService;
+    }
+
+    @GetMapping("/lootboxes")
+    public List<LootBoxEntity> getAllLootBoxes() {
+        return lootBoxRepository.findAll();
+    }
+
+    @PostMapping("/lootboxes/{id}")
+    public ResponseEntity<Object> purchaseLootBox(@PathVariable Long id, @RequestHeader("Authorization") String token) {
+        Optional<LootBoxEntity> optionalLootBox = lootBoxRepository.findById(id);
+        if (optionalLootBox.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        LootBoxEntity lootBox = optionalLootBox.get();
+
+        Optional<UserEntity> optionalUser = userService.getCurrentUser(token);
+        if (optionalUser.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        UserEntity user = optionalUser.get();
+
+        if (lootBoxService.hasSufficientBalance(user, lootBox.getPrice())) {
+            Map<String, String> errorResponse = new HashMap<>();
+            errorResponse.put("error", "Insufficient balance");
+            return ResponseEntity.badRequest().body(errorResponse);
+        }
+
+        RewardEntity reward = lootBoxService.determineReward(lootBox);
+        lootBoxService.handleBalance(user, lootBox, reward);
+
+        return ResponseEntity.ok(reward);
+    }
+}

backend/src/main/java/de/szut/casino/lootboxes/LootBoxEntity.java

@@ -0,0 +1,40 @@
+package de.szut.casino.lootboxes;
+
+import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+import de.szut.casino.blackjack.CardEntity;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.hibernate.annotations.SQLRestriction;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class LootBoxEntity {
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    private String name;
+
+    @Column(precision = 19, scale = 2)
+    private BigDecimal price;
+
+    @ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
+    @JoinTable(
+            name = "lootbox_reward",
+            joinColumns = @JoinColumn(name = "lootbox_id"),
+            inverseJoinColumns = @JoinColumn(name = "reward_id")
+    )
+    private List<RewardEntity> rewards = new ArrayList<>();
+}

backend/src/main/java/de/szut/casino/lootboxes/LootBoxRepository.java

@@ -0,0 +1,8 @@
+package de.szut.casino.lootboxes;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public interface LootBoxRepository extends JpaRepository<LootBoxEntity, Long> {
+}

backend/src/main/java/de/szut/casino/lootboxes/LootBoxService.java

@@ -0,0 +1,40 @@
+package de.szut.casino.lootboxes;
+
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserRepository;
+import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
+
+@Service
+public class LootBoxService {
+    private final UserRepository userRepository;
+
+    public LootBoxService(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
+    public boolean hasSufficientBalance(UserEntity user, BigDecimal price) {
+        return user.getBalance().compareTo(price) < 0;
+    }
+
+    public RewardEntity determineReward(LootBoxEntity lootBox) {
+        double randomValue = Math.random();
+        BigDecimal cumulativeProbability = BigDecimal.ZERO;
+
+        for (RewardEntity reward : lootBox.getRewards()) {
+            cumulativeProbability = cumulativeProbability.add(reward.getProbability());
+            if (randomValue <= cumulativeProbability.doubleValue()) {
+                return reward;
+            }
+        }
+
+        return lootBox.getRewards().getLast();
+    }
+
+    public void handleBalance(UserEntity user, LootBoxEntity lootBox, RewardEntity reward) {
+        user.setBalance(user.getBalance().subtract(lootBox.getPrice()));
+        user.setBalance(user.getBalance().add(reward.getValue()));
+        userRepository.save(user);
+    }
+}

backend/src/main/java/de/szut/casino/lootboxes/RewardEntity.java

@@ -0,0 +1,30 @@
+package de.szut.casino.lootboxes;
+
+import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+@Getter
+@Setter
+@Entity
+public class RewardEntity {
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @Column(precision = 19, scale = 2)
+    private BigDecimal value;
+
+    @Column(precision = 5, scale = 2)
+    private BigDecimal probability;
+
+    @ManyToMany(mappedBy = "rewards")
+    @JsonBackReference
+    private List<LootBoxEntity> lootBoxes = new ArrayList<>();
+}

backend/src/main/java/de/szut/casino/lootboxes/RewardRepository.java

@@ -0,0 +1,8 @@
+package de.szut.casino.lootboxes;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public interface RewardRepository extends JpaRepository<RewardEntity, Long> {
+}

backend/src/main/java/de/szut/casino/user/UserController.java

@@ -36,7 +36,7 @@ public class UserController {
 
     @GetMapping("/user")
     public ResponseEntity<GetUserDto> getCurrentUser(@RequestHeader("Authorization") String token) {
-        GetUserDto userData = userService.getCurrentUser(token);
+        GetUserDto userData = userService.getCurrentUserAsDto(token);
 
         if (userData == null) {
             return ResponseEntity.notFound().build();

backend/src/main/java/de/szut/casino/user/UserService.java

@@ -37,7 +37,7 @@ public class UserService {
         return user.map(userEntity -> mappingService.mapToGetUserDto(userEntity)).orElse(null);
     }
 
-    public GetUserDto getCurrentUser(String token) {
+    public GetUserDto getCurrentUserAsDto(String token) {
         KeycloakUserDto userData = getAuthentikUserInfo(token);
 
         if (userData == null) {
@@ -48,6 +48,15 @@ public class UserService {
         return user.map(userEntity -> mappingService.mapToGetUserDto(userEntity)).orElse(null);
     }
 
+    public Optional<UserEntity> getCurrentUser(String token) {
+        KeycloakUserDto userData = getKeycloakUserInfo(token);
+
+        if (userData == null) {
+            return Optional.empty();
+        }
+        return this.userRepository.findOneByKeycloakId(userData.getSub());
+    }
+
     private KeycloakUserDto getAuthentikUserInfo(String token) {
         try {
             HttpHeaders headers = new HttpHeaders();

backend/src/main/resources/application.properties

@@ -2,7 +2,7 @@ spring.datasource.url=jdbc:postgresql://${DB_HOST:localhost}:5432/postgresdb
 spring.datasource.username=postgres_user
 spring.datasource.password=postgres_pass
 server.port=8080
-spring.jpa.hibernate.ddl-auto=create-drop
+spring.jpa.hibernate.ddl-auto=update
 stripe.secret.key=${STRIPE_SECRET_KEY:sk_test_51QrePYIvCfqz7ANgqam8rEwWcMeKiLOof3j6SCMgu2sl4sESP45DJxca16mWcYo1sQaiBv32CMR6Z4AAAGQPCJo300ubuZKO8I}
 stripe.webhook.secret=whsec_746b6a488665f6057118bdb4a2b32f4916f16c277109eeaed5e8f8e8b81b8c15
 app.frontend-host=http://localhost:4200

frontend/package.json

@@ -9,38 +9,42 @@
     "test": "bunx @angular/cli test",
     "format": "prettier --write \"src/**/*.{ts,html,css,scss}\"",
     "format:check": "prettier --check \"src/**/*.{ts,html,css,scss}\"",
-    "lint": "ng lint"
+    "lint": "bunx @angular/cli lint"
   },
   "private": true,
   "dependencies": {
-    "@angular/animations": "^18.2.0",
+    "@angular/animations": "^19.0.0",
-    "@angular/cdk": "~18.2.14",
+    "@angular/cdk": "~19.2.0",
-    "@angular/common": "^18.2.0",
+    "@angular/common": "^19.0.0",
-    "@angular/compiler": "^18.2.0",
+    "@angular/compiler": "^19.2.4",
-    "@angular/core": "^18.2.0",
+    "@angular/core": "^19.0.0",
-    "@angular/forms": "^18.2.0",
+    "@angular/forms": "^19.0.0",
-    "@angular/platform-browser": "^18.2.0",
+    "@angular/platform-browser": "^19.0.0",
-    "@angular/platform-browser-dynamic": "^18.2.0",
+    "@angular/platform-browser-dynamic": "^19.0.0",
-    "@angular/router": "^18.2.0",
+    "@angular/router": "^19.0.0",
     "@fortawesome/angular-fontawesome": "^1.0.0",
     "@fortawesome/fontawesome-svg-core": "^6.7.2",
     "@fortawesome/free-brands-svg-icons": "^6.7.2",
     "@fortawesome/free-solid-svg-icons": "^6.7.2",
-    "@stripe/stripe-js": "^5.6.0",
+    "@stripe/stripe-js": "^7.0.0",
     "@tailwindcss/postcss": "^4.0.3",
+    "ajv": "8.17.1",
+    "ajv-formats": "3.0.1",
     "gsap": "^3.12.7",
     "angular-oauth2-oidc": "^19.0.0",
+    "keycloak-angular": "^19.0.0",
+    "keycloak-js": "^26.0.0",
     "postcss": "^8.5.1",
-    "rxjs": "~7.8.0",
+    "rxjs": "~7.8.2",
     "tailwindcss": "^4.0.3",
     "tslib": "^2.3.0"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^18.2.2",
+    "@angular-devkit/build-angular": "^19.0.0",
-    "@angular/cli": "^18.2.2",
+    "@angular/cli": "^19.2.5",
-    "@angular/compiler-cli": "^18.2.0",
+    "@angular/compiler-cli": "^19.0.0",
     "@types/jasmine": "~5.1.0",
-    "angular-eslint": "19.2.1",
+    "angular-eslint": "19.3.0",
     "eslint": "^9.20.0",
     "jasmine-core": "~5.6.0",
     "karma": "~6.4.0",
@@ -49,7 +53,7 @@
     "karma-jasmine": "~5.1.0",
     "karma-jasmine-html-reporter": "~2.1.0",
     "prettier": "^3.4.2",
-    "typescript": "~5.5.0",
+    "typescript": "~5.8.0",
-    "typescript-eslint": "8.26.1"
+    "typescript-eslint": "8.29.0"
   }
 }

frontend/src/app/app.routes.ts

@@ -16,4 +16,9 @@ export const routes: Routes = [
     loadComponent: () => import('./feature/home/home.component'),
     canActivate: [authGuard],
   },
+  {
+    path: 'game/blackjack',
+    loadComponent: () => import('./feature/game/blackjack/blackjack.component'),
+    canActivate: [authGuard],
+  },
 ];

frontend/src/app/feature/deposit/deposit.component.ts

@@ -16,12 +16,12 @@ import {
 } from '@angular/core';
 import { FormControl, FormGroup, ReactiveFormsModule, Validators } from '@angular/forms';
 import { loadStripe, Stripe } from '@stripe/stripe-js';
-import { DepositService } from '../../service/deposit.service';
 import { debounceTime } from 'rxjs';
-import { environment } from '../../../environments/environment';
 import { NgIf } from '@angular/common';
-import { ModalAnimationService } from '../../shared/services/modal-animation.service';
 import gsap from 'gsap';
+import { DepositService } from '@service/deposit.service';
+import { environment } from '@environments/environment';
+import { ModalAnimationService } from '@shared/services/modal-animation.service';
 
 @Component({
   selector: 'app-deposit',

frontend/src/app/feature/game/blackjack/blackjack.component.html

@@ -0,0 +1,59 @@
+<app-navbar></app-navbar>
+
+<div class="container mx-auto px-4 py-6 space-y-8">
+  <div class="grid grid-cols-1 lg:grid-cols-4 gap-6">
+    <div class="lg:col-span-3 space-y-6 flex flex-col gap-4">
+      <app-dealer-hand [cards]="dealerCards()"></app-dealer-hand>
+      <app-player-hand [cards]="playerCards()"></app-player-hand>
+
+      @if (isActionInProgress()) {
+        <div class="flex justify-center">
+          <div
+            class="card p-4 flex items-center gap-3 animate-pulse bg-deep-blue-light border border-deep-blue-light/50"
+          >
+            <div
+              class="w-5 h-5 rounded-full border-2 border-white border-t-transparent animate-spin"
+            ></div>
+            <span>{{ currentAction() }}</span>
+          </div>
+        </div>
+      }
+
+      @if (gameInProgress()) {
+        <app-game-controls
+          [playerCards]="playerCards()"
+          [gameState]="gameState()"
+          [isActionInProgress]="isActionInProgress()"
+          (hit)="onHit()"
+          (stand)="onStand()"
+          (doubleDown)="onDoubleDown()"
+          (leave)="leaveGame()"
+        ></app-game-controls>
+      }
+    </div>
+
+    <div class="lg:col-span-1 space-y-6">
+      <app-game-info
+        [balance]="balance()"
+        [currentBet]="currentBet()"
+        [gameInProgress]="gameInProgress()"
+        [isActionInProgress]="isActionInProgress()"
+        (newGame)="onNewGame($event)"
+      ></app-game-info>
+    </div>
+  </div>
+</div>
+
+<app-game-result
+  [gameState]="gameState()"
+  [amount]="currentBet()"
+  [balance]="balance()"
+  [show]="showGameResult()"
+  (gameResultClosed)="onCloseGameResult()"
+></app-game-result>
+
+<app-debt-dialog
+  [amount]="debtAmount()"
+  [show]="showDebtDialog()"
+  (dialogClosed)="onCloseDebtDialog()"
+></app-debt-dialog>

frontend/src/app/feature/game/blackjack/blackjack.component.ts

@@ -0,0 +1,231 @@
+import { ChangeDetectionStrategy, Component, inject, signal, OnInit } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { Router } from '@angular/router';
+import { PlayingCardComponent } from './components/playing-card/playing-card.component';
+import { DealerHandComponent } from './components/dealer-hand/dealer-hand.component';
+import { PlayerHandComponent } from './components/player-hand/player-hand.component';
+import { GameControlsComponent } from './components/game-controls/game-controls.component';
+import { GameInfoComponent } from './components/game-info/game-info.component';
+import { Card, BlackjackGame } from '@blackjack/models/blackjack.model';
+import { BlackjackService } from '@blackjack/services/blackjack.service';
+import { HttpErrorResponse } from '@angular/common/http';
+import { GameResultComponent } from '@blackjack/components/game-result/game-result.component';
+import { GameState } from '@blackjack/enum/gameState';
+import { NavbarComponent } from '@shared/components/navbar/navbar.component';
+import { UserService } from '@service/user.service';
+import { timer } from 'rxjs';
+import { DebtDialogComponent } from '@shared/components/debt-dialog/debt-dialog.component';
+
+@Component({
+  selector: 'app-blackjack',
+  standalone: true,
+  imports: [
+    CommonModule,
+    NavbarComponent,
+    PlayingCardComponent,
+    DealerHandComponent,
+    PlayerHandComponent,
+    GameControlsComponent,
+    GameInfoComponent,
+    GameResultComponent,
+    DebtDialogComponent,
+  ],
+  templateUrl: './blackjack.component.html',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export default class BlackjackComponent implements OnInit {
+  private router = inject(Router);
+  private userService = inject(UserService);
+  private blackjackService = inject(BlackjackService);
+
+  dealerCards = signal<Card[]>([]);
+  playerCards = signal<Card[]>([]);
+  currentBet = signal(0);
+  balance = signal(0);
+  currentGameId = signal<number | undefined>(undefined);
+  gameInProgress = signal(false);
+  gameState = signal<GameState>(GameState.IN_PROGRESS);
+  showGameResult = signal(false);
+
+  isActionInProgress = signal(false);
+  currentAction = signal<string>('');
+
+  showDebtDialog = signal(false);
+  debtAmount = signal(0);
+
+  ngOnInit(): void {
+    this.userService.currentUser$.subscribe((user) => {
+      if (user) {
+        this.balance.set(user.balance);
+      }
+    });
+  }
+
+  private updateGameState(game: BlackjackGame) {
+    console.log('Game state update:', game);
+    this.currentGameId.set(game.id);
+    this.currentBet.set(game.bet);
+    this.gameInProgress.set(game.state === GameState.IN_PROGRESS);
+    this.gameState.set(game.state as GameState);
+
+    const isGameOver = game.state !== GameState.IN_PROGRESS;
+
+    this.dealerCards.set(
+      game.dealerCards.map((card, index) => ({
+        ...card,
+        hidden: !isGameOver && index === 1 && game.state === GameState.IN_PROGRESS,
+      }))
+    );
+
+    this.playerCards.set(
+      game.playerCards.map((card) => ({
+        ...card,
+        hidden: false,
+      }))
+    );
+
+    if (isGameOver) {
+      console.log('Game is over, state:', game.state);
+      this.userService.refreshCurrentUser();
+      timer(1500).subscribe(() => {
+        this.showGameResult.set(true);
+        console.log('Game result dialog shown after delay');
+      });
+    }
+  }
+
+  onNewGame(bet: number): void {
+    this.isActionInProgress.set(true);
+    this.currentAction.set('Spiel wird gestartet...');
+
+    this.blackjackService.startGame(bet).subscribe({
+      next: (game) => {
+        this.updateGameState(game);
+        this.userService.refreshCurrentUser();
+        this.isActionInProgress.set(false);
+      },
+      error: (error) => {
+        console.error('Failed to start game:', error);
+        this.isActionInProgress.set(false);
+      },
+    });
+  }
+
+  onHit(): void {
+    if (!this.currentGameId() || this.isActionInProgress()) return;
+
+    this.isActionInProgress.set(true);
+    this.currentAction.set('Karte wird gezogen...');
+
+    this.blackjackService.hit(this.currentGameId()!).subscribe({
+      next: (game) => {
+        this.updateGameState(game);
+        if (game.state !== 'IN_PROGRESS') {
+          this.userService.refreshCurrentUser();
+        }
+        this.isActionInProgress.set(false);
+      },
+      error: (error) => {
+        console.error('Failed to hit:', error);
+        this.handleGameError(error);
+        this.isActionInProgress.set(false);
+      },
+    });
+  }
+
+  onStand(): void {
+    if (!this.currentGameId() || this.isActionInProgress()) return;
+
+    if (this.gameState() !== GameState.IN_PROGRESS) {
+      console.log('Cannot stand: game is not in progress');
+      return;
+    }
+
+    this.isActionInProgress.set(true);
+    this.currentAction.set('Dealer zieht Karten...');
+
+    this.blackjackService.stand(this.currentGameId()!).subscribe({
+      next: (game) => {
+        this.updateGameState(game);
+        this.userService.refreshCurrentUser();
+        this.isActionInProgress.set(false);
+      },
+      error: (error) => {
+        console.error('Failed to stand:', error);
+        this.handleGameError(error);
+        this.isActionInProgress.set(false);
+      },
+    });
+  }
+
+  onDoubleDown(): void {
+    if (!this.currentGameId() || this.isActionInProgress()) return;
+
+    if (this.gameState() !== GameState.IN_PROGRESS || this.playerCards().length !== 2) {
+      console.log('Cannot double down: game is not in progress or more than 2 cards');
+      return;
+    }
+
+    this.isActionInProgress.set(true);
+    this.currentAction.set('Einsatz wird verdoppelt...');
+
+    this.blackjackService.doubleDown(this.currentGameId()!).subscribe({
+      next: (game) => {
+        this.updateGameState(game);
+        this.userService.getCurrentUser().subscribe((user) => {
+          if (user && user.balance < 0) {
+            this.debtAmount.set(Math.abs(user.balance));
+            this.showDebtDialog.set(true);
+          }
+        });
+        this.isActionInProgress.set(false);
+      },
+      error: (error) => {
+        console.error('Failed to double down:', error);
+        this.handleGameError(error);
+        this.isActionInProgress.set(false);
+      },
+    });
+  }
+
+  onCloseGameResult(): void {
+    console.log('Closing game result dialog');
+    this.showGameResult.set(false);
+    this.userService.refreshCurrentUser();
+  }
+
+  onCloseDebtDialog(): void {
+    this.showDebtDialog.set(false);
+  }
+
+  private handleGameError(error: HttpErrorResponse): void {
+    if (error instanceof HttpErrorResponse) {
+      if (error.status === 400 && error.error?.error === 'Invalid state') {
+        this.gameInProgress.set(false);
+        this.userService.refreshCurrentUser();
+      } else if (error.status === 500) {
+        console.log('Server error occurred. The game may have been updated in another session.');
+        this.gameInProgress.set(false);
+        this.userService.refreshCurrentUser();
+        if (this.currentGameId()) {
+          this.refreshGameState(this.currentGameId()!);
+        }
+      }
+    }
+  }
+
+  private refreshGameState(gameId: number): void {
+    this.blackjackService.getGame(gameId).subscribe({
+      next: (game) => {
+        this.updateGameState(game);
+      },
+      error: (err) => {
+        console.error('Failed to refresh game state:', err);
+      },
+    });
+  }
+
+  leaveGame(): void {
+    this.router.navigate(['/home']);
+  }
+}

frontend/src/app/feature/game/blackjack/components/dealer-hand/dealer-hand.component.ts

@@ -0,0 +1,73 @@
+import { ChangeDetectionStrategy, Component, Input, OnChanges, SimpleChanges } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { Card } from '@blackjack/models/blackjack.model';
+import { PlayingCardComponent } from '../playing-card/playing-card.component';
+import { GameControlsService } from '@blackjack/services/game-controls.service';
+
+@Component({
+  selector: 'app-dealer-hand',
+  standalone: true,
+  imports: [CommonModule, PlayingCardComponent],
+  template: `
+    <div class="space-y-4">
+      <div class="flex justify-between items-center">
+        <h3 class="section-heading text-2xl">Dealer's Karten</h3>
+        <div class="flex items-center gap-2">
+          <div class="text-text-secondary">Punkte:</div>
+          <div class="text-xl font-bold text-accent-red">
+            {{ gameControlsService.calculateHandValue(cards) }}
+          </div>
+        </div>
+      </div>
+      <div class="card p-6 !bg-accent-red">
+        <div class="flex justify-center gap-4 min-h-[160px] p-4 border-2 border-red-400 rounded-lg">
+          @if (cards.length > 0) {
+            @for (card of cardsWithState; track card.id) {
+              <app-playing-card
+                [rank]="card.rank"
+                [suit]="card.suit"
+                [hidden]="card.hidden"
+                [isNew]="card.isNew"
+              ></app-playing-card>
+            }
+          } @else {
+            <div class="flex items-center justify-center text-white/70 text-lg font-medium">
+              Warte auf Spielstart...
+            </div>
+          }
+        </div>
+      </div>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class DealerHandComponent implements OnChanges {
+  @Input() cards: Card[] = [];
+  cardsWithState: (Card & { isNew: boolean; id: string })[] = [];
+
+  private lastCardCount = 0;
+
+  constructor(protected gameControlsService: GameControlsService) {}
+
+  ngOnChanges(changes: SimpleChanges): void {
+    if (changes['cards']) {
+      this.updateCardsWithState();
+    }
+  }
+
+  private updateCardsWithState(): void {
+    const newCards = this.cards.length > this.lastCardCount;
+
+    this.cardsWithState = this.cards.map((card, index) => {
+      const isNew = newCards && index >= this.lastCardCount;
+
+      return {
+        ...card,
+        isNew,
+        id: `${card.suit}-${card.rank}-${index}`,
+      };
+    });
+
+    this.lastCardCount = this.cards.length;
+  }
+}

frontend/src/app/feature/game/blackjack/components/game-controls/game-controls.component.ts

@@ -0,0 +1,100 @@
+import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { GameState } from '@blackjack/enum/gameState';
+import { Card } from '@blackjack/models/blackjack.model';
+import { GameControlsService } from '@blackjack/services/game-controls.service';
+
+@Component({
+  selector: 'app-game-controls',
+  standalone: true,
+  imports: [CommonModule],
+  template: `
+    <div class="flex flex-col gap-4">
+      <div class="flex justify-center text-lg mb-5">
+        <div class="card p-4">
+          <div class="text-emerald font-bold mb-1">
+            Deine Punkte: {{ gameControlsService.calculateHandValue(playerCards) }}
+          </div>
+          <div class="text-text-secondary">
+            Status:
+            <span [class]="gameControlsService.getStatusClass(gameState)">{{
+              gameControlsService.getStatusText(gameState)
+            }}</span>
+          </div>
+        </div>
+      </div>
+      <div class="flex justify-center gap-4">
+        <button
+          (click)="hit.emit()"
+          class="button-primary px-8 py-4 text-lg font-medium min-w-[120px] relative"
+          [disabled]="gameState !== GameState.IN_PROGRESS || isActionInProgress"
+          [class.opacity-50]="isActionInProgress"
+        >
+          <span [class.invisible]="isActionInProgress">Ziehen</span>
+          @if (isActionInProgress) {
+            <div class="absolute inset-0 flex items-center justify-center">
+              <div
+                class="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin"
+              ></div>
+            </div>
+          }
+        </button>
+        <button
+          (click)="stand.emit()"
+          class="button-primary px-8 py-4 text-lg font-medium min-w-[120px] relative"
+          [disabled]="gameState !== GameState.IN_PROGRESS || isActionInProgress"
+          [class.opacity-50]="isActionInProgress"
+        >
+          <span [class.invisible]="isActionInProgress">Halten</span>
+          @if (isActionInProgress) {
+            <div class="absolute inset-0 flex items-center justify-center">
+              <div
+                class="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin"
+              ></div>
+            </div>
+          }
+        </button>
+        <button
+          (click)="doubleDown.emit()"
+          class="button-primary px-8 py-4 text-lg font-medium min-w-[120px] relative"
+          [disabled]="
+            gameState !== GameState.IN_PROGRESS || playerCards.length !== 2 || isActionInProgress
+          "
+          [class.opacity-50]="isActionInProgress"
+        >
+          <span [class.invisible]="isActionInProgress">Verdoppeln</span>
+          @if (isActionInProgress) {
+            <div class="absolute inset-0 flex items-center justify-center">
+              <div
+                class="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin"
+              ></div>
+            </div>
+          }
+        </button>
+        <button
+          (click)="leave.emit()"
+          class="bg-accent-red hover:bg-accent-red/80 px-8 py-4 rounded text-lg font-medium min-w-[120px] transition-all duration-300"
+          [disabled]="isActionInProgress"
+          [class.opacity-50]="isActionInProgress"
+        >
+          Abbrechen
+        </button>
+      </div>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class GameControlsComponent {
+  @Input() playerCards: Card[] = [];
+  @Input() gameState: GameState = GameState.IN_PROGRESS;
+  @Input() isActionInProgress = false;
+
+  @Output() hit = new EventEmitter<void>();
+  @Output() stand = new EventEmitter<void>();
+  @Output() doubleDown = new EventEmitter<void>();
+  @Output() leave = new EventEmitter<void>();
+
+  protected readonly GameState = GameState;
+
+  constructor(protected gameControlsService: GameControlsService) {}
+}

frontend/src/app/feature/game/blackjack/components/game-info/game-info.component.ts

@@ -0,0 +1,149 @@
+import {
+  ChangeDetectionStrategy,
+  Component,
+  EventEmitter,
+  Input,
+  OnChanges,
+  Output,
+  SimpleChanges,
+  signal,
+} from '@angular/core';
+import { CommonModule, CurrencyPipe } from '@angular/common';
+import { FormGroup, ReactiveFormsModule } from '@angular/forms';
+import { BettingService } from '@blackjack/services/betting.service';
+
+@Component({
+  selector: 'app-game-info',
+  standalone: true,
+  imports: [CommonModule, CurrencyPipe, ReactiveFormsModule],
+  template: `
+    <div class="card p-4">
+      <h3 class="section-heading text-xl mb-4">Spiel Informationen</h3>
+      <div class="space-y-4">
+        <div class="flex justify-between items-center">
+          <span class="text-text-secondary">Aktuelle Wette:</span>
+          <span [class]="currentBet > 0 ? 'text-accent-red' : 'text-text-secondary'">
+            {{ currentBet | currency: 'EUR' }}
+          </span>
+        </div>
+
+        @if (!gameInProgress) {
+          <div class="grid grid-cols-2 gap-2 mb-4">
+            <button
+              (click)="setBetAmount(0.1)"
+              class="button-primary py-2 text-sm"
+              [disabled]="gameInProgress"
+            >
+              10%
+            </button>
+            <button
+              (click)="setBetAmount(0.25)"
+              class="button-primary py-2 text-sm"
+              [disabled]="gameInProgress"
+            >
+              25%
+            </button>
+            <button
+              (click)="setBetAmount(0.5)"
+              class="button-primary py-2 text-sm"
+              [disabled]="gameInProgress"
+            >
+              50%
+            </button>
+            <button
+              (click)="setBetAmount(1)"
+              class="button-primary py-2 text-sm"
+              [disabled]="gameInProgress"
+            >
+              100%
+            </button>
+          </div>
+        }
+
+        <form [formGroup]="betForm" (ngSubmit)="onSubmit()" class="space-y-2">
+          <div class="space-y-1">
+            <label for="bet" class="text-sm text-text-secondary">Einsatz</label>
+            <input
+              type="number"
+              id="bet"
+              formControlName="bet"
+              class="w-full px-3 py-2 bg-deep-blue-light text-white rounded focus:outline-none focus:ring-2 focus:ring-emerald disabled:opacity-50"
+              [min]="1"
+              [max]="balance"
+              step="0.01"
+              [disabled]="gameInProgress || isActionInProgress"
+              [placeholder]="balance | currency: 'EUR'"
+            />
+            @if (betForm.get('bet')?.errors?.['required'] && betForm.get('bet')?.touched) {
+              <span class="text-xs text-accent-red">Bitte geben Sie einen Einsatz ein</span>
+            }
+            @if (betForm.get('bet')?.errors?.['min'] && betForm.get('bet')?.touched) {
+              <span class="text-xs text-accent-red">Mindestens 1€ setzen</span>
+            }
+            @if (betForm.get('bet')?.errors?.['max'] && betForm.get('bet')?.touched) {
+              <span class="text-xs text-accent-red">Nicht genügend Guthaben</span>
+            }
+          </div>
+          <button
+            type="submit"
+            class="button-primary w-full py-2 relative"
+            [disabled]="!betForm.valid || gameInProgress || isActionInProgress"
+          >
+            <span [class.invisible]="isActionInProgress">Neues Spiel</span>
+            @if (isActionInProgress) {
+              <div class="absolute inset-0 flex items-center justify-center">
+                <div
+                  class="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin"
+                ></div>
+              </div>
+            }
+          </button>
+        </form>
+      </div>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class GameInfoComponent implements OnChanges {
+  @Input() set balance(value: number) {
+    this._balance.set(value);
+  }
+  get balance() {
+    return this._balance();
+  }
+  private _balance = signal(0);
+
+  @Input() currentBet = 0;
+  @Input() gameInProgress = false;
+  @Input() isActionInProgress = false;
+  @Output() newGame = new EventEmitter<number>();
+
+  betForm: FormGroup;
+
+  constructor(private bettingService: BettingService) {
+    this.betForm = this.bettingService.createBetForm();
+  }
+
+  ngOnChanges(changes: SimpleChanges): void {
+    if (changes['balance']) {
+      this.bettingService.updateBetFormValidators(this.betForm, this.balance);
+    }
+  }
+
+  setBetAmount(percentage: number) {
+    const betAmount = this.bettingService.calculateBetAmount(this.balance, percentage);
+    if (this.bettingService.isValidBet(betAmount, this.balance)) {
+      this.betForm.patchValue({ bet: betAmount });
+    }
+  }
+
+  onSubmit() {
+    if (this.betForm.valid) {
+      const betAmount = parseFloat(this.betForm.value.bet);
+      if (this.bettingService.isValidBet(betAmount, this.balance)) {
+        this.newGame.emit(betAmount);
+        this.betForm.reset();
+      }
+    }
+  }
+}

frontend/src/app/feature/game/blackjack/components/game-result/game-result.component.ts

@@ -0,0 +1,127 @@
+import { ChangeDetectionStrategy, Component, Input, Output, EventEmitter } from '@angular/core';
+import { CommonModule, CurrencyPipe } from '@angular/common';
+import { animate, style, transition, trigger } from '@angular/animations';
+import { GameState } from '../../enum/gameState';
+
+@Component({
+  selector: 'app-game-result',
+  standalone: true,
+  imports: [CommonModule, CurrencyPipe],
+  template: `
+    <div *ngIf="visible" [@fadeInOut] class="modal-bg" style="z-index: 1000; position: fixed;">
+      <div class="modal-card" [@cardAnimation]>
+        <h2 class="modal-heading" [class]="getResultClass()">{{ getResultTitle() }}</h2>
+        <p class="py-2 text-text-secondary mb-4">{{ getResultMessage() }}</p>
+
+        <div
+          class="bg-deep-blue-light/50 rounded-lg p-5 mb-6 shadow-inner border border-deep-blue-light/30"
+        >
+          <div class="grid grid-cols-2 gap-4">
+            <div class="text-text-secondary">Einsatz:</div>
+            <div class="font-medium text-right">{{ amount | currency: 'EUR' }}</div>
+
+            <div class="text-text-secondary">
+              {{ isDraw ? 'Zurückgegeben:' : isWin ? 'Gewonnen:' : 'Verloren:' }}
+            </div>
+            <div
+              class="font-medium text-right"
+              [ngClass]="{
+                'text-emerald': isWin,
+                'text-accent-red': isLoss,
+                'text-yellow-400': isDraw,
+              }"
+            >
+              {{ isLoss ? '-' : '+' }}{{ isWin ? amount * 2 : (amount | currency: 'EUR') }}
+              <div *ngIf="isWin" class="text-xs text-text-secondary">
+                (Einsatz {{ amount | currency: 'EUR' }} × 2)
+              </div>
+            </div>
+
+            <div class="text-text-secondary border-t border-text-secondary/20 pt-3 font-medium">
+              Kontostand:
+            </div>
+            <div class="font-medium text-right border-t border-text-secondary/20 pt-3">
+              {{ balance | currency: 'EUR' }}
+            </div>
+          </div>
+        </div>
+
+        <button type="button" (click)="closeDialog()" class="button-primary w-full py-2">
+          Verstanden
+        </button>
+      </div>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  animations: [
+    trigger('fadeInOut', [
+      transition(':enter', [
+        style({ opacity: 0 }),
+        animate('150ms ease-out', style({ opacity: 1 })),
+      ]),
+      transition(':leave', [animate('150ms ease-in', style({ opacity: 0 }))]),
+    ]),
+    trigger('cardAnimation', [
+      transition(':enter', [
+        style({ opacity: 0, transform: 'scale(0.95)' }),
+        animate('200ms ease-out', style({ opacity: 1, transform: 'scale(1)' })),
+      ]),
+    ]),
+  ],
+})
+export class GameResultComponent {
+  @Input() gameState: GameState = GameState.IN_PROGRESS;
+  @Input() amount = 0;
+  @Input() balance = 0;
+  @Input() set show(value: boolean) {
+    console.log('GameResultComponent show input changed:', value, 'gameState:', this.gameState);
+    this.visible = value;
+  }
+
+  @Output() gameResultClosed = new EventEmitter<void>();
+
+  visible = false;
+
+  get isWin(): boolean {
+    return this.gameState === GameState.PLAYER_WON || this.gameState === GameState.PLAYER_BLACKJACK;
+  }
+
+  get isLoss(): boolean {
+    return this.gameState === GameState.PLAYER_LOST;
+  }
+
+  get isDraw(): boolean {
+    return this.gameState === GameState.DRAW;
+  }
+
+  getResultTitle(): string {
+    if (this.gameState === GameState.PLAYER_BLACKJACK) return 'Blackjack!';
+    if (this.isWin) return 'Gewonnen!';
+    if (this.isLoss) return 'Verloren!';
+    if (this.isDraw) return 'Unentschieden!';
+    return '';
+  }
+
+  getResultMessage(): string {
+    if (this.gameState === GameState.PLAYER_BLACKJACK)
+      return 'Glückwunsch! Du hast mit einem Blackjack gewonnen!';
+    if (this.isWin) return 'Glückwunsch! Du hast diese Runde gewonnen.';
+    if (this.isLoss) return 'Schade! Du hast diese Runde verloren.';
+    if (this.isDraw) return 'Diese Runde endet unentschieden. Dein Einsatz wurde zurückgegeben.';
+    return '';
+  }
+
+  getResultClass(): string {
+    if (this.gameState === GameState.PLAYER_BLACKJACK) return 'text-emerald font-bold';
+    if (this.isWin) return 'text-emerald';
+    if (this.isLoss) return 'text-accent-red';
+    if (this.isDraw) return 'text-yellow-400';
+    return '';
+  }
+
+  closeDialog(): void {
+    this.visible = false;
+    this.gameResultClosed.emit();
+    console.log('Dialog closed by user');
+  }
+}

frontend/src/app/feature/game/blackjack/components/player-hand/player-hand.component.ts

@@ -0,0 +1,75 @@
+import { ChangeDetectionStrategy, Component, Input, OnChanges, SimpleChanges } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { PlayingCardComponent } from '../playing-card/playing-card.component';
+import { Card } from '@blackjack/models/blackjack.model';
+import { GameControlsService } from '@blackjack/services/game-controls.service';
+
+@Component({
+  selector: 'app-player-hand',
+  standalone: true,
+  imports: [CommonModule, PlayingCardComponent],
+  template: `
+    <div class="space-y-4">
+      <div class="flex justify-between items-center">
+        <h3 class="section-heading text-2xl">Deine Karten</h3>
+        <div class="flex items-center gap-2">
+          <div class="text-text-secondary">Punkte:</div>
+          <div class="text-xl font-bold text-emerald">
+            {{ gameControlsService.calculateHandValue(cards) }}
+          </div>
+        </div>
+      </div>
+      <div class="card p-6 !bg-emerald">
+        <div
+          class="flex justify-center gap-4 min-h-[160px] p-4 border-2 border-emerald-400 rounded-lg"
+        >
+          @if (cards.length > 0) {
+            @for (card of cardsWithState; track card.id) {
+              <app-playing-card
+                [rank]="card.rank"
+                [suit]="card.suit"
+                [hidden]="card.hidden"
+                [isNew]="card.isNew"
+              ></app-playing-card>
+            }
+          } @else {
+            <div class="flex items-center justify-center text-white/70 text-lg font-medium">
+              Platziere eine Wette um zu spielen...
+            </div>
+          }
+        </div>
+      </div>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class PlayerHandComponent implements OnChanges {
+  @Input() cards: Card[] = [];
+  cardsWithState: (Card & { isNew: boolean; id: string })[] = [];
+
+  private lastCardCount = 0;
+
+  constructor(protected gameControlsService: GameControlsService) {}
+
+  ngOnChanges(changes: SimpleChanges): void {
+    if (changes['cards']) {
+      this.updateCardsWithState();
+    }
+  }
+
+  private updateCardsWithState(): void {
+    const newCards = this.cards.length > this.lastCardCount;
+
+    this.cardsWithState = this.cards.map((card, index) => {
+      const isNew = newCards && index >= this.lastCardCount;
+
+      return {
+        ...card,
+        isNew,
+        id: `${card.suit}-${card.rank}-${index}`,
+      };
+    });
+
+    this.lastCardCount = this.cards.length;
+  }
+}

frontend/src/app/feature/game/blackjack/components/playing-card/playing-card.component.ts

@@ -0,0 +1,133 @@
+import {
+  ChangeDetectionStrategy,
+  Component,
+  Input,
+  AfterViewInit,
+  ElementRef,
+  OnChanges,
+  SimpleChanges,
+} from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { gsap } from 'gsap';
+import { Suit, suitSymbols } from '@blackjack/models/blackjack.model';
+
+@Component({
+  selector: 'app-playing-card',
+  standalone: true,
+  imports: [CommonModule],
+  template: `
+    <div
+      #cardElement
+      class="w-24 h-36 rounded-lg p-2 relative flex flex-col justify-between shadow-lg card-element"
+      [class]="hidden ? 'bg-red-800' : 'bg-white'"
+    >
+      @if (!hidden) {
+        <span class="text-xl font-bold" [class]="isRedSuit ? 'text-accent-red' : 'text-black'">{{
+          getDisplayRank(rank)
+        }}</span>
+      }
+      @if (!hidden) {
+        <span
+          class="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 text-3xl"
+          [class]="isRedSuit ? 'text-accent-red' : 'text-black'"
+          >{{ getSuitSymbol(suit) }}</span
+        >
+      }
+      @if (!hidden) {
+        <span
+          class="text-xl font-bold self-end rotate-180"
+          [class]="isRedSuit ? 'text-accent-red' : 'text-black'"
+          >{{ getDisplayRank(rank) }}</span
+        >
+      }
+    </div>
+  `,
+  styles: [
+    `
+      .card-element {
+        transform-style: preserve-3d;
+        backface-visibility: hidden;
+      }
+    `,
+  ],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class PlayingCardComponent implements AfterViewInit, OnChanges {
+  @Input({ required: true }) rank!: string;
+  @Input({ required: true }) suit!: Suit;
+  @Input({ required: true }) hidden!: boolean;
+  @Input() isNew = false;
+
+  constructor(private elementRef: ElementRef) {}
+
+  get isRedSuit(): boolean {
+    return this.suit === 'HEARTS' || this.suit === 'DIAMONDS';
+  }
+
+  ngAfterViewInit(): void {
+    if (this.isNew) {
+      this.animateNewCard();
+    }
+  }
+
+  ngOnChanges(changes: SimpleChanges): void {
+    if (changes['hidden'] && !changes['hidden'].firstChange) {
+      this.animateCardFlip();
+    }
+  }
+
+  private animateNewCard(): void {
+    const cardElement = this.elementRef.nativeElement.querySelector('.card-element');
+    gsap.fromTo(
+      cardElement,
+      {
+        y: -100,
+        opacity: 0,
+        rotation: -10,
+        scale: 0.7,
+      },
+      {
+        y: 0,
+        opacity: 1,
+        rotation: 0,
+        scale: 1,
+        duration: 0.5,
+        ease: 'power2.out',
+      }
+    );
+  }
+
+  private animateCardFlip(): void {
+    const cardElement = this.elementRef.nativeElement.querySelector('.card-element');
+    gsap.to(cardElement, {
+      rotationY: 180,
+      duration: 0.3,
+      onComplete: () => {
+        gsap.set(cardElement, { rotationY: 0 });
+      },
+    });
+  }
+
+  protected getSuitSymbol(suit: Suit): string {
+    return suitSymbols[suit];
+  }
+
+  protected getDisplayRank(rank: string): string {
+    const rankMap: Record<string, string> = {
+      TWO: '2',
+      THREE: '3',
+      FOUR: '4',
+      FIVE: '5',
+      SIX: '6',
+      SEVEN: '7',
+      EIGHT: '8',
+      NINE: '9',
+      TEN: '10',
+      JACK: 'J',
+      QUEEN: 'Q',
+      KING: 'K',
+      ACE: 'A',
+    };
+    return rankMap[rank] || rank;
+  }
+}

frontend/src/app/feature/game/blackjack/enum/gameState.ts

@@ -0,0 +1,7 @@
+export enum GameState {
+  PLAYER_WON = 'PLAYER_WON',
+  IN_PROGRESS = 'IN_PROGRESS',
+  PLAYER_LOST = 'PLAYER_LOST',
+  DRAW = 'DRAW',
+  PLAYER_BLACKJACK = 'PLAYER_BLACKJACK',
+}

frontend/src/app/feature/game/blackjack/models/blackjack.model.ts

@@ -0,0 +1,23 @@
+export type Suit = 'HEARTS' | 'DIAMONDS' | 'CLUBS' | 'SPADES';
+
+export interface Card {
+  suit: Suit;
+  rank: string;
+  hidden: boolean;
+}
+
+export interface BlackjackGame {
+  id: number;
+  state: string;
+  bet: number;
+  playerCards: Card[];
+  dealerCards: Card[];
+  userId: number;
+}
+
+export const suitSymbols: Record<Suit, string> = {
+  HEARTS: '♥',
+  DIAMONDS: '♦',
+  CLUBS: '♣',
+  SPADES: '♠',
+};

frontend/src/app/feature/game/blackjack/models/card.model.ts

@@ -0,0 +1,5 @@
+export interface Card {
+  value: string;
+  suit: string;
+  hidden: boolean;
+}

frontend/src/app/feature/game/blackjack/services/betting.service.ts

@@ -0,0 +1,31 @@
+import { Injectable } from '@angular/core';
+import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class BettingService {
+  constructor(private fb: FormBuilder) {}
+
+  createBetForm(): FormGroup {
+    return this.fb.group({
+      bet: ['', [Validators.required, Validators.min(1)]],
+    });
+  }
+
+  updateBetFormValidators(form: FormGroup, balance: number): void {
+    form.reset();
+    form
+      .get('bet')
+      ?.setValidators([Validators.required, Validators.min(1), Validators.max(balance)]);
+    form.get('bet')?.updateValueAndValidity();
+  }
+
+  calculateBetAmount(balance: number, percentage: number): number {
+    return Math.floor(balance * percentage * 100) / 100;
+  }
+
+  isValidBet(betAmount: number, balance: number): boolean {
+    return betAmount >= 1 && betAmount <= balance;
+  }
+}

frontend/src/app/feature/game/blackjack/services/blackjack.service.ts

@@ -0,0 +1,66 @@
+import { Injectable, inject } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Observable, catchError } from 'rxjs';
+import { BlackjackGame } from '@blackjack/models/blackjack.model';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class BlackjackService {
+  private http = inject(HttpClient);
+
+  startGame(bet: number): Observable<BlackjackGame> {
+    return this.http
+      .post<BlackjackGame>('/backend/blackjack/start', { betAmount: bet }, { responseType: 'json' })
+      .pipe(
+        catchError((error) => {
+          console.error('Start game error:', error);
+          throw error;
+        })
+      );
+  }
+
+  hit(gameId: number): Observable<BlackjackGame> {
+    return this.http
+      .post<BlackjackGame>(`/backend/blackjack/${gameId}/hit`, {}, { responseType: 'json' })
+      .pipe(
+        catchError((error) => {
+          console.error('Hit error:', error);
+          throw error;
+        })
+      );
+  }
+
+  stand(gameId: number): Observable<BlackjackGame> {
+    return this.http
+      .post<BlackjackGame>(`/backend/blackjack/${gameId}/stand`, {}, { responseType: 'json' })
+      .pipe(
+        catchError((error) => {
+          console.error('Stand error:', error);
+          throw error;
+        })
+      );
+  }
+
+  doubleDown(gameId: number): Observable<BlackjackGame> {
+    return this.http
+      .post<BlackjackGame>(`/backend/blackjack/${gameId}/doubleDown`, {}, { responseType: 'json' })
+      .pipe(
+        catchError((error) => {
+          console.error('Double Down error:', error);
+          throw error;
+        })
+      );
+  }
+
+  getGame(gameId: number): Observable<BlackjackGame> {
+    return this.http
+      .get<BlackjackGame>(`/backend/blackjack/${gameId}`, { responseType: 'json' })
+      .pipe(
+        catchError((error) => {
+          console.error('Get game error:', error);
+          throw error;
+        })
+      );
+  }
+}

frontend/src/app/feature/game/blackjack/services/game-controls.service.ts

@@ -0,0 +1,74 @@
+import { Injectable } from '@angular/core';
+import { Card } from '../models/blackjack.model';
+import { GameState } from '../enum/gameState';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class GameControlsService {
+  calculateHandValue(cards: Card[]): number {
+    let sum = 0;
+    let aceCount = 0;
+
+    const rankValues: Record<string, number> = {
+      TWO: 2,
+      THREE: 3,
+      FOUR: 4,
+      FIVE: 5,
+      SIX: 6,
+      SEVEN: 7,
+      EIGHT: 8,
+      NINE: 9,
+      TEN: 10,
+      JACK: 10,
+      QUEEN: 10,
+      KING: 10,
+      ACE: 11,
+    };
+
+    for (const card of cards) {
+      if (!card.hidden) {
+        const value = rankValues[card.rank] || 0;
+        sum += value;
+        if (card.rank === 'ACE') {
+          aceCount++;
+        }
+      }
+    }
+
+    while (sum > 21 && aceCount > 0) {
+      sum -= 10;
+      aceCount--;
+    }
+
+    return sum;
+  }
+
+  getStatusText(state: GameState): string {
+    switch (state) {
+      case GameState.IN_PROGRESS:
+        return 'Spiel läuft';
+      case GameState.PLAYER_WON:
+        return 'Gewonnen!';
+      case GameState.PLAYER_LOST:
+        return 'Verloren!';
+      case GameState.DRAW:
+        return 'Unentschieden!';
+      default:
+        return state;
+    }
+  }
+
+  getStatusClass(state: GameState): string {
+    switch (state) {
+      case GameState.PLAYER_WON:
+        return 'text-emerald';
+      case GameState.PLAYER_LOST:
+        return 'text-accent-red';
+      case GameState.DRAW:
+        return 'text-yellow-400';
+      default:
+        return 'text-white';
+    }
+  }
+}

frontend/src/app/feature/home/home.component.html

@@ -34,7 +34,9 @@
                   class="absolute bottom-4 left-4 right-4 transform translate-y-4 group-hover:translate-y-0 transition-transform duration-300"
                 >
                   <h4 class="game-heading">{{ game.name }}</h4>
-                  <button class="button-primary w-full py-2">Jetzt Spielen</button>
+                  <button class="button-primary w-full py-2" (click)="navigateToGame(game.route)">
+                    Jetzt Spielen
+                  </button>
                 </div>
               </div>
             </div>
@@ -59,7 +61,9 @@
                   class="absolute bottom-4 left-4 right-4 transform translate-y-4 group-hover:translate-y-0 transition-transform duration-300"
                 >
                   <h4 class="game-heading">{{ game.name }}</h4>
-                  <button class="button-primary w-full py-2">Jetzt Spielen</button>
+                  <button class="button-primary w-full py-2" (click)="navigateToGame(game.route)">
+                    Jetzt Spielen
+                  </button>
                 </div>
               </div>
             </div>

frontend/src/app/feature/home/home.component.ts

@@ -1,11 +1,11 @@
 import { ChangeDetectionStrategy, Component, OnInit } from '@angular/core';
-import { NavbarComponent } from '../../shared/components/navbar/navbar.component';
 import { CurrencyPipe, NgFor } from '@angular/common';
-import { Game } from '../../model/Game';
-import { Transaction } from '../../model/Transaction';
 import { DepositComponent } from '../deposit/deposit.component';
-import { ConfirmationComponent } from '../../shared/components/confirmation/confirmation.component';
 import { ActivatedRoute, Router } from '@angular/router';
+import { ConfirmationComponent } from '@shared/components/confirmation/confirmation.component';
+import { Transaction } from 'app/model/Transaction';
+import { NavbarComponent } from '@shared/components/navbar/navbar.component';
+import { Game } from 'app/model/Game';
 
 @Component({
   selector: 'app-homepage',
@@ -38,31 +38,37 @@ export default class HomeComponent implements OnInit {
       id: '1',
       name: 'Poker',
       image: '/poker.webp',
+      route: '/game/poker',
     },
     {
       id: '2',
       name: 'Blackjack',
       image: '/blackjack.webp',
+      route: '/game/blackjack',
     },
     {
       id: '3',
       name: 'Slots',
       image: '/slots.webp',
+      route: '/game/slots',
     },
     {
       id: '4',
       name: 'Plinko',
       image: '/plinko.webp',
+      route: '/game/plinko',
     },
     {
       id: '5',
       name: 'Liars Dice',
       image: '/liars-dice.webp',
+      route: '/game/liars-dice',
     },
     {
       id: '6',
       name: 'Lootboxen',
       image: '/lootbox.webp',
+      route: '/game/lootbox',
     },
   ];
 
@@ -83,4 +89,8 @@ export default class HomeComponent implements OnInit {
   closeDepositConfirmationModal() {
     this.isDepositSuccessful = false;
   }
+
+  navigateToGame(route: string) {
+    this.router.navigate([route]);
+  }
 }

frontend/src/app/feature/landing/landing.component.ts

@@ -1,6 +1,6 @@
 import { ChangeDetectionStrategy, Component, OnInit, OnDestroy } from '@angular/core';
-import { NavbarComponent } from '../../shared/components/navbar/navbar.component';
 import { NgFor } from '@angular/common';
+import { NavbarComponent } from '@shared/components/navbar/navbar.component';
 
 @Component({
   selector: 'app-landing-page',

frontend/src/app/feature/login-success/login-success.component.ts

@@ -1,7 +1,6 @@
 import { ChangeDetectionStrategy, Component, inject, OnInit } from '@angular/core';
 import { Router } from '@angular/router';
 import { AuthService } from '../../service/auth.service';
-import { User } from '../../model/User';
 import { OAuthService } from 'angular-oauth2-oidc';
 
 @Component({

frontend/src/app/model/Game.ts

@@ -2,4 +2,5 @@ export interface Game {
   id: string;
   name: string;
   image: string;
+  route: string;
 }

frontend/src/app/service/user.service.ts

@@ -1,6 +1,6 @@
 import { inject, Injectable } from '@angular/core';
 import { HttpClient } from '@angular/common/http';
-import { catchError, EMPTY, Observable } from 'rxjs';
+import { BehaviorSubject, catchError, EMPTY, Observable, tap } from 'rxjs';
 import { User } from '../model/User';
 
 @Injectable({
@@ -8,16 +8,37 @@ import { User } from '../model/User';
 })
 export class UserService {
   private http: HttpClient = inject(HttpClient);
+  private currentUserSubject = new BehaviorSubject<User | null>(null);
+  public currentUser$ = this.currentUserSubject.asObservable();
+
+  constructor() {
+    // Initialize with current user data
+    this.getCurrentUser().subscribe();
+  }
+
+  public getUser(id: string): Observable<User | null> {
+    return this.http.get<User | null>(`/backend/user/${id}`).pipe(
+      catchError(() => EMPTY),
+      tap((user) => this.currentUserSubject.next(user))
+    );
+  }
 
   public getCurrentUser(): Observable<User | null> {
-    return this.http.get<User | null>('/backend/user').pipe(catchError(() => EMPTY));
+    return this.http.get<User | null>('/backend/user').pipe(
+      catchError(() => EMPTY),
+      tap((user) => this.currentUserSubject.next(user))
+    );
+  }
+
+  public refreshCurrentUser(): void {
+    this.getCurrentUser().subscribe();
   }
 
   public createUser(id: string, username: string): Observable<User> {
     return this.http.post<User>('/backend/user', {
       authentikId: id,
       username: username,
-    });
+    }).pipe(tap((user) => this.currentUserSubject.next(user)));
   }
 
   public getOrCreateUser(profile: any): Observable<User> {

frontend/src/app/shared/components/confirmation/confirmation.component.ts

@@ -8,7 +8,7 @@ import {
   AfterViewInit,
   OnDestroy,
 } from '@angular/core';
-import { ModalAnimationService } from '../../services/modal-animation.service';
+import { ModalAnimationService } from '@shared/services/modal-animation.service';
 import gsap from 'gsap';
 
 @Component({

frontend/src/app/shared/components/debt-dialog/debt-dialog.component.ts

@@ -0,0 +1,173 @@
+import {
+  ChangeDetectionStrategy,
+  Component,
+  EventEmitter,
+  Input,
+  OnDestroy,
+  OnInit,
+  Output,
+  signal,
+} from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { animate, style, transition, trigger } from '@angular/animations';
+import { interval, Subscription, takeWhile } from 'rxjs';
+
+@Component({
+  selector: 'app-debt-dialog',
+  standalone: true,
+  imports: [CommonModule],
+  template: `
+    <div *ngIf="visible" [@fadeInOut] class="modal-bg" style="z-index: 1000; position: fixed;">
+      <div class="modal-card" [@cardAnimation]>
+        <h2 class="modal-heading text-accent-red">WARNUNG!</h2>
+        <p class="py-2 text-text-secondary mb-4">
+          Du hast nicht genug Geld für den Double Down. Du bist jetzt im Minus und schuldest uns
+          {{ amount | currency: 'EUR' }}.
+        </p>
+        <p class="py-2 text-accent-red mb-4 font-bold">
+          Liefer das Geld sofort an den Dead Drop oder es wird unangenehme Konsequenzen geben!
+        </p>
+        <div
+          class="bg-deep-blue-light/50 rounded-lg p-5 mb-6 shadow-inner border border-deep-blue-light/30"
+        >
+          <div class="grid grid-cols-2 gap-4">
+            <div class="text-text-secondary">Schulden:</div>
+            <div class="font-medium text-right text-accent-red">{{ amount | currency: 'EUR' }}</div>
+          </div>
+        </div>
+        <div class="text-center mb-6">
+          <div
+            class="text-8xl font-bold text-accent-red"
+            [class.animate-pulse]="timeLeft() <= 10"
+            [class.animate-bounce]="timeLeft() <= 5"
+            [@countdown]="timeLeft()"
+          >
+            {{ timeLeft() }}
+          </div>
+          <div class="text-text-secondary mt-2">Sekunden verbleibend</div>
+        </div>
+        @if (timeLeft() === 0) {
+          <div class="text-center mb-6">
+            <div class="relative">
+              <div class="absolute inset-0 bg-accent-red/20 blur-xl rounded-full"></div>
+              <div
+                class="relative bg-gradient-to-b from-accent-red to-red-900 p-8 rounded-lg border-2 border-accent-red shadow-lg"
+              >
+                <div class="flex items-center justify-center gap-4 mb-4">
+                  <svg
+                    class="w-12 h-12 text-accent-red animate-[spin_2s_linear_infinite]"
+                    xmlns="http://www.w3.org/2000/svg"
+                    viewBox="0 0 24 24"
+                    fill="currentColor"
+                  >
+                    <path
+                      d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm-1-13h2v6h-2zm0 8h2v2h-2z"
+                    />
+                  </svg>
+                  <span
+                    class="text-4xl font-black tracking-wider text-white animate-[pulse_1s_ease-in-out_infinite]"
+                  >
+                    ZEIT ABGELAUFEN
+                  </span>
+                  <svg
+                    class="w-12 h-12 text-accent-red animate-[spin_2s_linear_infinite]"
+                    xmlns="http://www.w3.org/2000/svg"
+                    viewBox="0 0 24 24"
+                    fill="currentColor"
+                  >
+                    <path
+                      d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm-1-13h2v6h-2zm0 8h2v2h-2z"
+                    />
+                  </svg>
+                </div>
+                <div
+                  class="text-2xl font-bold text-white/90 tracking-wider animate-[pulse_1s_ease-in-out_infinite]"
+                >
+                  KONSEQUENZEN FOLGEN
+                </div>
+              </div>
+            </div>
+          </div>
+        }
+        <button type="button" (click)="closeDialog()" class="button-primary w-full py-2">
+          Verstanden
+        </button>
+      </div>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  animations: [
+    trigger('fadeInOut', [
+      transition(':enter', [
+        style({ opacity: 0 }),
+        animate('150ms ease-out', style({ opacity: 1 })),
+      ]),
+      transition(':leave', [animate('150ms ease-in', style({ opacity: 0 }))]),
+    ]),
+    trigger('cardAnimation', [
+      transition(':enter', [
+        style({ opacity: 0, transform: 'scale(0.95)' }),
+        animate('200ms ease-out', style({ opacity: 1, transform: 'scale(1)' })),
+      ]),
+    ]),
+    trigger('countdown', [
+      transition('* => *', [
+        style({ transform: 'scale(1.2)' }),
+        animate('100ms ease-out', style({ transform: 'scale(1)' })),
+      ]),
+    ]),
+  ],
+})
+export class DebtDialogComponent implements OnInit, OnDestroy {
+  @Input() amount = 0;
+  @Input() set show(value: boolean) {
+    this.visible = value;
+    if (value) {
+      this.startTimer();
+    }
+  }
+
+  @Output() dialogClosed = new EventEmitter<void>();
+
+  visible = false;
+  timeLeft = signal(30);
+  private timerSubscription: Subscription | undefined;
+  private warningSound = new Audio('assets/sounds/warning.mp3');
+
+  ngOnInit() {
+    if (this.visible) {
+      this.startTimer();
+    }
+  }
+
+  ngOnDestroy() {
+    this.stopTimer();
+  }
+
+  private startTimer() {
+    this.timeLeft.set(30);
+    this.timerSubscription = interval(1000)
+      .pipe(takeWhile(() => this.timeLeft() > 0))
+      .subscribe(() => {
+        this.timeLeft.update((value) => value - 1);
+        if (this.timeLeft() <= 5) {
+          this.warningSound.play();
+        }
+        if (this.timeLeft() === 0) {
+          setTimeout(() => this.closeDialog(), 5000);
+        }
+      });
+  }
+
+  private stopTimer() {
+    if (this.timerSubscription) {
+      this.timerSubscription.unsubscribe();
+    }
+  }
+
+  closeDialog(): void {
+    this.stopTimer();
+    this.visible = false;
+    this.dialogClosed.emit();
+  }
+}

frontend/src/app/shared/components/navbar/navbar.component.html

@@ -17,8 +17,11 @@
         @if (isLoggedIn) {
           <div
             class="text-white font-bold bg-deep-blue-contrast rounded-full px-4 py-2 text-sm hover:bg-deep-blue-contrast/80 hover:cursor-pointer hover:scale-105 transition-all active:scale-95 select-none duration-300"
+            routerLink="/home"
           >
-            <span>Balance: {{ balance() | currency: 'EUR' : 'symbol' : '1.2-2' }}</span>
+            <span [class]="balance() < 0 ? 'text-accent-red' : ''">{{
+              balance() | currency: 'EUR' : 'symbol' : '1.2-2'
+            }}</span>
           </div>
           <button (click)="logout()" class="button-primary px-4 py-1.5">Abmelden</button>
         }

frontend/src/app/shared/components/navbar/navbar.component.ts

@@ -1,8 +1,16 @@
-import { ChangeDetectionStrategy, Component, inject, OnInit, signal } from '@angular/core';
+import {
+  ChangeDetectionStrategy,
+  Component,
+  inject,
+  OnInit,
+  OnDestroy,
+  signal,
+} from '@angular/core';
 import { RouterModule } from '@angular/router';
-import { UserService } from '../../../service/user.service';
-import { CurrencyPipe } from '@angular/common';
 import { AuthService } from '../../../service/auth.service';
+import { CurrencyPipe } from '@angular/common';
+import { UserService } from '@service/user.service';
+import { Subscription } from 'rxjs';
 
 @Component({
   selector: 'app-navbar',
@@ -11,22 +19,27 @@ import { AuthService } from '../../../service/auth.service';
   imports: [RouterModule, CurrencyPipe],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class NavbarComponent implements OnInit {
+export class NavbarComponent implements OnInit, OnDestroy {
   isMenuOpen = false;
   private authService: AuthService = inject(AuthService);
   isLoggedIn = this.authService.isLoggedIn();
 
   private userService = inject(UserService);
-  private user = this.userService.getCurrentUser();
+  private userSubscription: Subscription | undefined;
-
   public balance = signal(0);
 
   ngOnInit() {
-    this.user.subscribe((user) => {
+    this.userSubscription = this.userService.currentUser$.subscribe((user) => {
       this.balance.set(user?.balance ?? 0);
     });
   }
 
+  ngOnDestroy() {
+    if (this.userSubscription) {
+      this.userSubscription.unsubscribe();
+    }
+  }
+
   login() {
     try {
       this.authService.login();

frontend/tsconfig.json

@@ -3,6 +3,13 @@
 {
   "compileOnSave": false,
   "compilerOptions": {
+    "baseUrl": "./src",
+    "paths": {
+      "@service/*": ["app/service/*"],
+      "@environments/*": ["environments/*"],
+      "@shared/*": ["app/shared/*"],
+      "@blackjack/*": ["app/feature/game/blackjack/*"]
+    },
     "outDir": "./dist/out-tsc",
     "strict": true,
     "noImplicitOverride": true,