Merge pull request 'feat: Implement starting a Blackjack game (CAS-50)' (!89) from feat/blackjack into main

Reviewed-on: #89
Reviewed-by: Jan K9f <jan@kjan.email>

backend/requests/blackjack.http

@@ -0,0 +1,7 @@
+POST http://localhost:8080/blackjack/start
+Authorization: Bearer {{token}}
+Content-Type: application/json
+
+{
+  "betAmount": 1.01
+}

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

@@ -0,0 +1,57 @@
+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.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.math.BigDecimal;
+import java.util.HashMap;
+import java.util.Map;
+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;
+    }
+
+    @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 +1,46 @@
+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 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;
+
+    // Expose UserID to JSON output
+    public Long getUserId() {
+        return user != null ? user.getId() : null;
+    }
+
+    private String state;
+    private BigDecimal bet;
+
+    @OneToMany(mappedBy = "game", cascade = CascadeType.ALL, orphanRemoval = true)
+    @JsonManagedReference
+    private List<CardEntity> playerCards = new ArrayList<>();
+
+    @OneToMany(mappedBy = "game", cascade = CascadeType.ALL, orphanRemoval = true)
+    @JsonManagedReference
+    private List<CardEntity> dealerCards = new ArrayList<>();
+}

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 +1,50 @@
+package de.szut.casino.blackjack;
+
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserRepository;
+import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
+import java.util.Random;
+
+@Service
+public class BlackJackService {
+    private final BlackJackGameRepository blackJackGameRepository;
+    private final UserRepository userRepository;
+
+    public BlackJackService(BlackJackGameRepository blackJackGameRepository, UserRepository userRepository) {
+        this.blackJackGameRepository = blackJackGameRepository;
+        this.userRepository = userRepository;
+    }
+
+    private final Random random = new Random();
+
+    public BlackJackGameEntity createBlackJackGame(UserEntity user, BigDecimal betAmount) {
+        BlackJackGameEntity game = new BlackJackGameEntity();
+        game.setUser(user);
+        game.setBet(betAmount);
+
+        for (int i = 0; i < 2; i++) {
+            CardEntity playerCard = createRandomCard(game);
+            game.getPlayerCards().add(playerCard);
+        }
+
+        CardEntity dealerCard = createRandomCard(game);
+        game.getDealerCards().add(dealerCard);
+
+        user.setBalance(user.getBalance().subtract(betAmount));
+
+        userRepository.save(user);
+        blackJackGameRepository.save(game);
+
+        return game;
+    }
+
+    private CardEntity createRandomCard(BlackJackGameEntity game) {
+        CardEntity card = new CardEntity();
+        card.setGame(game);
+        card.setSuit(Suit.values()[random.nextInt(Suit.values().length)]);
+        card.setRank(Rank.values()[random.nextInt(Rank.values().length)]);
+        return card;
+    }
+}

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

@@ -0,0 +1,33 @@
+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;
+}

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/user/UserController.java

@@ -44,7 +44,7 @@ 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

@@ -38,7 +38,7 @@ public class UserService {
         return user.map(userEntity -> mappingService.mapToGetUserDto(userEntity)).orElse(null);
     }
 
-    public GetUserDto getCurrentUser(String token) {
+    public GetUserDto getCurrentUserAsDto(String token) {
         KeycloakUserDto userData = getKeycloakUserInfo(token);
 
         if (userData == null) {
@@ -47,7 +47,15 @@ public class UserService {
         Optional<UserEntity> user = this.userRepository.findOneByKeycloakId(userData.getSub());
 
         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 getKeycloakUserInfo(String token) {

backend/src/test/java/de/szut/casino/user/UserControllerTest.java

@@ -1,122 +0,0 @@
-package de.szut.casino.user;
-
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyString;
-import static org.mockito.Mockito.when;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
-
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
-import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
-import org.springframework.boot.test.mock.mockito.MockBean;
-import org.springframework.http.MediaType;
-import org.springframework.test.web.servlet.MockMvc;
-
-import com.fasterxml.jackson.databind.ObjectMapper;
-
-import de.szut.casino.user.dto.CreateUserDto;
-import de.szut.casino.user.dto.GetUserDto;
-
-@WebMvcTest(UserController.class)
-@AutoConfigureMockMvc(addFilters = false)
-public class UserControllerTest {
-
-    @Autowired
-    private MockMvc mockMvc;
-
-    @Autowired
-    private ObjectMapper objectMapper;
-
-    @MockBean
-    private UserService userService;
-
-    private GetUserDto getUserDto;
-    private CreateUserDto createUserDto;
-    private UserEntity testUser;
-    private final String TEST_ID = "test-id-123";
-    private final String AUTH_TOKEN = "Bearer test-token";
-
-    @BeforeEach
-    void setUp() {
-        getUserDto = new GetUserDto();
-        getUserDto.setKeycloakId(TEST_ID);
-        getUserDto.setUsername("testuser");
-
-        testUser = new UserEntity();
-        testUser.setKeycloakId(TEST_ID);
-        testUser.setUsername("testuser");
-
-        createUserDto = new CreateUserDto();
-        createUserDto.setKeycloakId(TEST_ID);
-        createUserDto.setUsername("testuser");
-    }
-
-    @Test
-    void getUserByIdSuccess() throws Exception {
-        when(userService.exists(TEST_ID)).thenReturn(true);
-        when(userService.getUser(TEST_ID)).thenReturn(getUserDto);
-
-        mockMvc.perform(get("/user/" + TEST_ID))
-                .andExpect(status().isOk())
-                .andExpect(jsonPath("$.keycloakId").value(TEST_ID))
-                .andExpect(jsonPath("$.username").value("testuser"));
-    }
-
-    @Test
-    void getUserByIdNotFound() throws Exception {
-        when(userService.exists(TEST_ID)).thenReturn(false);
-
-        mockMvc.perform(get("/user/" + TEST_ID))
-                .andExpect(status().isNotFound());
-    }
-
-    @Test
-    void createUserSuccess() throws Exception {
-        when(userService.exists(TEST_ID)).thenReturn(false);
-        when(userService.createUser(any(CreateUserDto.class))).thenReturn(testUser);
-
-        mockMvc.perform(post("/user")
-                        .contentType(MediaType.APPLICATION_JSON)
-                        .content(objectMapper.writeValueAsString(createUserDto)))
-                .andExpect(status().isOk())
-                .andExpect(jsonPath("$.keycloakId").value(TEST_ID))
-                .andExpect(jsonPath("$.username").value("testuser"));
-    }
-
-    @Test
-    void createUserAlreadyExists() throws Exception {
-        when(userService.exists(TEST_ID)).thenReturn(true);
-
-        mockMvc.perform(post("/user")
-                        .contentType(MediaType.APPLICATION_JSON)
-                        .content(objectMapper.writeValueAsString(createUserDto)))
-                .andExpect(status().isFound())
-                .andExpect(header().string("Location", "/user/" + TEST_ID));
-    }
-
-    @Test
-    void getCurrentUserSuccess() throws Exception {
-        when(userService.getCurrentUser(AUTH_TOKEN)).thenReturn(getUserDto);
-
-        mockMvc.perform(get("/user")
-                        .header("Authorization", AUTH_TOKEN))
-                .andExpect(status().isOk())
-                .andExpect(jsonPath("$.keycloakId").value(TEST_ID))
-                .andExpect(jsonPath("$.username").value("testuser"));
-    }
-
-    @Test
-    void getCurrentUserNotFound() throws Exception {
-        when(userService.getCurrentUser(anyString())).thenReturn(null);
-
-        mockMvc.perform(get("/user")
-                        .header("Authorization", AUTH_TOKEN))
-                .andExpect(status().isNotFound());
-    }
-}