feat(blackjack): add action indicators and loading states

backend/requests/blackjack.http

@@ -10,3 +10,11 @@ Content-Type: application/json
 POST http://localhost:8080/blackjack/202/hit
 Authorization: Bearer {{token}}
 
+###
+POST http://localhost:8080/blackjack/202/stand
+Authorization: Bearer {{token}}
+
+###
+GET http://localhost:8080/blackjack/202
+Authorization: Bearer {{token}}
+

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

@@ -26,6 +26,23 @@ public class BlackJackGameController {
         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);
@@ -40,13 +57,41 @@ public class BlackJackGameController {
             return ResponseEntity.notFound().build();
         }
 
-        if (game.getState() != BlackJackState.IN_PROGRESS) {
-            Map<String, String> errorResponse = new HashMap<>();
-            errorResponse.put("error", "Invalid state");
-            return ResponseEntity.badRequest().body(errorResponse);
+        return ResponseEntity.ok(blackJackService.hit(game));
     }
 
-        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/start")

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

@@ -24,12 +24,15 @@ public class BlackJackGameEntity {
     @GeneratedValue
     private Long id;
 
+    @Version
+    @JsonIgnore
+    private Long version;
+
     @ManyToOne
     @JoinColumn(name = "user_id", nullable = false)
     @JsonIgnore
     private UserEntity user;
 
-    // Expose UserID to JSON output
     public Long getUserId() {
         return user != null ? user.getId() : null;
     }

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

@@ -3,6 +3,7 @@ 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;
@@ -13,52 +14,168 @@ import java.util.Random;
 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;
     }
 
-    private final Random random = new Random();
-
     public BlackJackGameEntity getBlackJackGame(Long id) {
-        Optional<BlackJackGameEntity> optionalBlackJackGame = blackJackGameRepository.findById(id);
-        return optionalBlackJackGame.orElse(null);
+        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);
-
-        for (int i = 0; i < 2; i++) {
-            CardEntity playerCard = drawCardFromDeck(game);
-            playerCard.setCardType(CardType.PLAYER);
-            game.getPlayerCards().add(playerCard);
-        }
-
-        CardEntity dealerCard = drawCardFromDeck(game);
-        dealerCard.setCardType(CardType.DEALER);
-        game.getDealerCards().add(dealerCard);
+        dealInitialCards(game);
         
         game.setState(getState(game));
-        user.setBalance(user.getBalance().subtract(betAmount));
+        deductBetFromBalance(user, betAmount);
         
-        userRepository.save(user);
-        blackJackGameRepository.save(game);
+        return blackJackGameRepository.save(game);
+    }
+
+    @Transactional
+    public BlackJackGameEntity hit(BlackJackGameEntity game) {
+        game = refreshGameState(game);
+        
+        if (game.getState() != BlackJackState.IN_PROGRESS) {
+            return game;
+        }
+        
+        dealCardToPlayer(game);
+        updateGameStateAndBalance(game);
+        
+        return blackJackGameRepository.save(game);
+    }
+
+    @Transactional
+    public BlackJackGameEntity stand(BlackJackGameEntity game) {
+        game = refreshGameState(game);
+        
+        if (game.getState() != BlackJackState.IN_PROGRESS) {
+            return game;
+        }
+        
+        dealCardsToDealerUntilMinimumScore(game);
+        determineWinnerAndUpdateBalance(game);
+        
+        return blackJackGameRepository.save(game);
+    }
+
+    @Transactional
+    public BlackJackGameEntity doubleDown(BlackJackGameEntity game) {
+        game = refreshGameState(game);
+        
+        if (game.getState() != BlackJackState.IN_PROGRESS || game.getPlayerCards().size() != 2) {
+            return game;
+        }
+        
+        UserEntity user = getUserWithFreshData(game.getUser());
+        BigDecimal additionalBet = game.getBet();
+        
+        if (user.getBalance().compareTo(additionalBet) < 0) {
+            return game;
+        }
+        
+        deductBetFromBalance(user, additionalBet);
+        game.setBet(game.getBet().add(additionalBet));
+        
+        dealCardToPlayer(game);
+        updateGameStateAndBalance(game);
+        
+        if (game.getState() == BlackJackState.IN_PROGRESS) {
+            return stand(game);
+        }
         
         return game;
     }
 
-    public BlackJackGameEntity hit(BlackJackGameEntity game) {
-        CardEntity drawnCard = drawCardFromDeck(game);
-        drawnCard.setCardType(CardType.PLAYER);
-        game.getPlayerCards().add(drawnCard);
     
+    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 updateGameStateAndBalance(BlackJackGameEntity game) {
         game.setState(getState(game));
         
-        return blackJackGameRepository.save(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); // For draw, player gets their bet back
+        }
+    }
+    
+    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 betAmount = game.getBet();
+        BigDecimal balance = user.getBalance();
+        
+        if (isWin) {
+            balance = balance.add(betAmount.multiply(BigDecimal.valueOf(2)));
+        } else if (game.getState() == BlackJackState.DRAW) {
+            balance = balance.add(betAmount);
+        }
+        
+        user.setBalance(balance);
+        userRepository.save(user);
     }
 
     private void initializeDeck(BlackJackGameEntity game) {
@@ -99,6 +216,7 @@ public class BlackJackService {
     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) {

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

@@ -4,4 +4,5 @@ public enum BlackJackState {
     PLAYER_WON,
     IN_PROGRESS,
     PLAYER_LOST,
+    DRAW,
 }

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

@@ -19,6 +19,10 @@ public class CardEntity {
     @JsonIgnore
     private Long id;
 
+    @Version
+    @JsonIgnore
+    private Long version;
+
     @ManyToOne
     @JoinColumn(name = "game_id", nullable = false)
     @JsonBackReference

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

@@ -5,10 +5,25 @@
     <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>
+      
+      <!-- Action message indicator -->
+      @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>
       }
@@ -19,8 +34,17 @@
         [balance]="balance()"
         [currentBet]="currentBet()"
         [gameInProgress]="gameInProgress()"
+        [isActionInProgress]="isActionInProgress()"
         (newGame)="onNewGame($event)"
       ></app-game-info>
     </div>
   </div>
 </div>
+
+<!-- Game Result Modal -->
+<app-game-result
+  [gameState]="gameState()"
+  [amount]="currentBet()"
+  [show]="showGameResult()"
+  (close)="onCloseGameResult()"
+></app-game-result>

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

@@ -10,6 +10,8 @@ import { GameControlsComponent } from './components/game-controls/game-controls.
 import { GameInfoComponent } from './components/game-info/game-info.component';
 import { Card, BlackjackGame } from './models/blackjack.model';
 import { BlackjackService } from './services/blackjack.service';
+import { HttpErrorResponse } from '@angular/common/http';
+import { GameResultComponent } from './components/game-result/game-result.component';
 
 @Component({
   selector: 'app-blackjack',
@@ -22,6 +24,7 @@ import { BlackjackService } from './services/blackjack.service';
     PlayerHandComponent,
     GameControlsComponent,
     GameInfoComponent,
+    GameResultComponent,
   ],
   templateUrl: './blackjack.component.html',
   changeDetection: ChangeDetectionStrategy.OnPush,
@@ -37,8 +40,18 @@ export default class BlackjackComponent {
   balance = signal(0);
   currentGameId = signal<number | undefined>(undefined);
   gameInProgress = signal(false);
+  gameState = signal<string>('IN_PROGRESS');
+  showGameResult = signal(false);
+  
+  // Add loading state trackers
+  isActionInProgress = signal(false);
+  currentAction = signal<string>('');
 
   constructor() {
+    this.refreshUserBalance();
+  }
+
+  private refreshUserBalance(): void {
     this.userService.getCurrentUser().subscribe((user) => {
       this.balance.set(user?.balance ?? 0);
     });
@@ -49,11 +62,15 @@ export default class BlackjackComponent {
     this.currentGameId.set(game.id);
     this.currentBet.set(game.bet);
     this.gameInProgress.set(game.state === 'IN_PROGRESS');
+    this.gameState.set(game.state);
+
+    // When game ends, make sure all dealer cards are visible
+    const isGameOver = game.state !== 'IN_PROGRESS';
     
     this.dealerCards.set(
       game.dealerCards.map((card, index) => ({
         ...card,
-        hidden: index === 1 && game.state === 'IN_PROGRESS',
+        hidden: !isGameOver && index === 1 && game.state === 'IN_PROGRESS',
       }))
     );
 
@@ -63,45 +80,139 @@ export default class BlackjackComponent {
         hidden: false,
       }))
     );
+
+    // Only refresh and show game result if the game has ended
+    if (isGameOver) {
+      console.log('Game is over, state:', game.state);
+      this.refreshUserBalance();
+      
+      // Show result immediately without resetting first
+      this.showGameResult.set(true);
+      console.log('Game result dialog should be shown now');
+    }
   }
 
   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.refreshUserBalance();
+        this.isActionInProgress.set(false);
       },
       error: (error) => {
         console.error('Failed to start game:', error);
+        this.isActionInProgress.set(false);
       },
     });
   }
 
   onHit(): void {
-    if (!this.currentGameId()) return;
+    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);
+        this.isActionInProgress.set(false);
       },
       error: (error) => {
         console.error('Failed to hit:', error);
+        this.handleGameError(error);
+        this.isActionInProgress.set(false);
       },
     });
   }
 
   onStand(): void {
-    if (!this.currentGameId()) return;
+    if (!this.currentGameId() || this.isActionInProgress()) return;
+    
+    if (this.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.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() !== '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.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);
+  }
+
+  private handleGameError(error: any): void {
+    if (error instanceof HttpErrorResponse) {
+      if (error.status === 400 && error.error?.error === 'Invalid state') {
+        this.gameInProgress.set(false);
+        
+        this.refreshUserBalance();
+      } 
+      else if (error.status === 500) {
+        console.log('Server error occurred. The game may have been updated in another session.');
+        
+        this.gameInProgress.set(false);
+        
+        this.refreshUserBalance();
+        
+        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

@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, Input } from '@angular/core';
+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 '../../models/blackjack.model';
@@ -13,11 +13,12 @@ import { Card } from '../../models/blackjack.model';
       <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 cards; track card) {
+            @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 {
@@ -31,6 +32,33 @@ import { Card } from '../../models/blackjack.model';
   `,
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class DealerHandComponent {
+export class DealerHandComponent implements OnChanges {
   @Input() cards: Card[] = [];
+  cardsWithState: (Card & { isNew: boolean; id: string })[] = [];
+  
+  private lastCardCount = 0;
+  
+  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) => {
+      // Consider a card new if it's added after the initial state and is the latest card
+      const isNew = newCards && index >= this.lastCardCount;
+      
+      return {
+        ...card,
+        isNew,
+        // Generate a unique ID to help Angular track the cards
+        id: `${card.suit}-${card.rank}-${index}`
+      };
+    });
+    
+    this.lastCardCount = this.cards.length;
+  }
 }

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

@@ -1,36 +1,147 @@
-import { ChangeDetectionStrategy, Component, EventEmitter, Output } from '@angular/core';
+import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output } from '@angular/core';
 import { CommonModule } from '@angular/common';
+import { Card } from '../../models/blackjack.model';
 
 @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: {{ calculateHandValue(playerCards) }}</div>
+          <div class="text-text-secondary">
+            Status: <span [class]="getStatusClass(gameState)">{{ 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]"
+          class="button-primary px-8 py-4 text-lg font-medium min-w-[120px] relative"
+          [disabled]="gameState !== 'IN_PROGRESS' || isActionInProgress"
+          [class.opacity-50]="isActionInProgress"
         >
-        Ziehen
+          <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]"
+          class="button-primary px-8 py-4 text-lg font-medium min-w-[120px] relative"
+          [disabled]="gameState !== 'IN_PROGRESS' || isActionInProgress"
+          [class.opacity-50]="isActionInProgress"
         >
-        Halten
+          <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 !== '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: string = 'IN_PROGRESS';
+  @Input() isActionInProgress: boolean = false;
+  
   @Output() hit = new EventEmitter<void>();
   @Output() stand = new EventEmitter<void>();
+  @Output() doubleDown = new EventEmitter<void>();
   @Output() leave = new EventEmitter<void>();
+
+  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: string): string {
+    switch (state) {
+      case 'IN_PROGRESS':
+        return 'Spiel läuft';
+      case 'PLAYER_WON':
+        return 'Gewonnen!';
+      case 'PLAYER_LOST':
+        return 'Verloren!';
+      case 'DRAW':
+        return 'Unentschieden!';
+      default:
+        return state;
+    }
+  }
+
+  getStatusClass(state: string): string {
+    switch (state) {
+      case 'PLAYER_WON':
+        return 'text-emerald';
+      case 'PLAYER_LOST':
+        return 'text-accent-red';
+      case 'DRAW':
+        return 'text-yellow-400';
+      default:
+        return 'text-white';
+    }
+  }
 }

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

@@ -86,10 +86,15 @@ import { FormBuilder, FormGroup, ReactiveFormsModule, Validators } from '@angula
           </div>
           <button
             type="submit"
-            class="button-primary w-full py-2"
-            [disabled]="!betForm.valid || gameInProgress"
+            class="button-primary w-full py-2 relative"
+            [disabled]="!betForm.valid || gameInProgress || isActionInProgress"
           >
-            Neues Spiel
+            <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>
@@ -101,6 +106,7 @@ export class GameInfoComponent implements OnChanges {
   @Input() balance = 0;
   @Input() currentBet = 0;
   @Input() gameInProgress = false;
+  @Input() isActionInProgress = false;
   @Output() newGame = new EventEmitter<number>();
 
   betForm: FormGroup;

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

@@ -0,0 +1 @@
+/* No custom styles needed */

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

@@ -0,0 +1,23 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { GameResultComponent } from './game-result.component';
+
+describe('GameResultComponent', () => {
+  let component: GameResultComponent;
+  let fixture: ComponentFixture<GameResultComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [GameResultComponent]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(GameResultComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

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

@@ -0,0 +1,134 @@
+import { ChangeDetectionStrategy, Component, Input, Output, EventEmitter } from '@angular/core';
+import { CommonModule, CurrencyPipe } from '@angular/common';
+import { animate, style, transition, trigger } from '@angular/animations';
+
+@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 }} €</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 ? '-' : '+' }}{{ amount }} €
+            </div>
+            
+            <div class="text-text-secondary border-t border-text-secondary/20 pt-3 font-medium">Gesamt:</div>
+            <div 
+              class="font-medium text-right border-t border-text-secondary/20 pt-3"
+              [ngClass]="{
+                'text-emerald': isWin,
+                'text-accent-red': isLoss,
+                'text-white': isDraw
+              }"
+            >
+              {{ isWin ? '+' : (isLoss ? '-' : '') }}{{ amount }} €
+            </div>
+          </div>
+        </div>
+        
+        <button
+          type="button"
+          (click)="closeDialog()"
+          class="button-primary w-full py-2"
+        >
+          Verstanden
+        </button>
+      </div>
+    </div>
+  `,
+  styleUrls: ['./game-result.component.css'],
+  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: string = '';
+  @Input() amount: number = 0;
+  @Input() set show(value: boolean) {
+    console.log('GameResultComponent show input changed:', value, 'gameState:', this.gameState);
+    this.visible = value;
+  }
+  
+  @Output() close = new EventEmitter<void>();
+  
+  visible = false;
+  
+  get isWin(): boolean {
+    return this.gameState === 'PLAYER_WON';
+  }
+  
+  get isLoss(): boolean {
+    return this.gameState === 'PLAYER_LOST';
+  }
+  
+  get isDraw(): boolean {
+    return this.gameState === 'DRAW';
+  }
+  
+  getResultTitle(): string {
+    if (this.isWin) return 'Gewonnen!';
+    if (this.isLoss) return 'Verloren!';
+    if (this.isDraw) return 'Unentschieden!';
+    return '';
+  }
+  
+  getResultMessage(): string {
+    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.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.close.emit();
+    console.log('Dialog closed by user');
+  }
+}

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

@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, Input } from '@angular/core';
+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 '../../models/blackjack.model';
@@ -15,11 +15,12 @@ import { Card } from '../../models/blackjack.model';
           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 cards; track card) {
+            @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 {
@@ -33,6 +34,33 @@ import { Card } from '../../models/blackjack.model';
   `,
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class PlayerHandComponent {
+export class PlayerHandComponent implements OnChanges {
   @Input() cards: Card[] = [];
+  cardsWithState: (Card & { isNew: boolean; id: string })[] = [];
+  
+  private lastCardCount = 0;
+  
+  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) => {
+      // Consider a card new if it's added after the initial state and is the latest card
+      const isNew = newCards && index >= this.lastCardCount;
+      
+      return {
+        ...card,
+        isNew,
+        // Generate a unique ID to help Angular track the cards
+        id: `${card.suit}-${card.rank}-${index}`
+      };
+    });
+    
+    this.lastCardCount = this.cards.length;
+  }
 }

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

@@ -1,6 +1,7 @@
-import { ChangeDetectionStrategy, Component, Input } from '@angular/core';
+import { ChangeDetectionStrategy, Component, Input, AfterViewInit, ElementRef, OnChanges, SimpleChanges } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { suitSymbols, Suit } from '../../models/blackjack.model';
+import { gsap } from 'gsap';
 
 @Component({
   selector: 'app-playing-card',
@@ -8,31 +9,90 @@ import { suitSymbols, Suit } from '../../models/blackjack.model';
   imports: [CommonModule],
   template: `
     <div
-      class="w-24 h-36 rounded-lg p-2 relative flex flex-col justify-between shadow-lg"
+      #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 text-accent-red">{{ getDisplayRank(rank) }}</span>
+        <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 text-accent-red"
+          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 text-accent-red self-end rotate-180">{{
+        <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 {
+export class PlayingCardComponent implements AfterViewInit, OnChanges {
   @Input({ required: true }) rank!: string;
   @Input({ required: true }) suit!: Suit;
   @Input({ required: true }) hidden!: boolean;
+  @Input() isNew: boolean = 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];

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

@@ -41,4 +41,26 @@ export class BlackjackService {
         })
       );
   }
+
+  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;
+        })
+      );
+  }
 }