✨ feat : 정답없이 문제 조회

Author: silver-eunjoo

backend/src/main/java/io/f1/backend/domain/game/app/RoomService.java

@@ -41,6 +41,7 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.atomic.AtomicLong;
+import org.springframework.transaction.annotation.Transactional;
 
 @Service
 @RequiredArgsConstructor
@@ -190,4 +191,33 @@ private static String getDestination(Long roomId) {
     private static Player createPlayer() {
         return new Player(getCurrentUserId(), getCurrentUserNickname());
     }
+
+    @Transactional(readOnly = true)
+    public Integer checkGameSetting(Long roomId, Long quizId) {
+        Room room =
+            roomRepository
+                .findRoom(roomId)
+                .orElseThrow(() -> new IllegalArgumentException("404 존재하지 않는 방입니다."));
+
+        GameSetting gameSetting = room.getGameSetting();
+
+        Long roomQuizId = gameSetting.getQuizId();
+
+        // TODO : 에러 코드 추가하기
+        if(!roomQuizId.equals(quizId)) {
+            throw new IllegalArgumentException("게임 설정이 다릅니다. (게임을 시작할 수 없습니다.)");
+        }
+
+        return gameSetting.getRound();
+    }
+
+    @Transactional
+    public void gameStart(Long roomId) {
+        Room room =
+            roomRepository
+                .findRoom(roomId)
+                .orElseThrow(() -> new IllegalArgumentException("404 존재하지 않는 방입니다."));
+
+        room.gameStart();
+    }
 }

backend/src/main/java/io/f1/backend/domain/game/dto/request/GameStartRequest.java

@@ -0,0 +1,3 @@
+package io.f1.backend.domain.game.dto.request;
+
+public record GameStartRequest(Long quizId) { }

backend/src/main/java/io/f1/backend/domain/game/dto/response/GameStartResponse.java

@@ -0,0 +1,6 @@
+package io.f1.backend.domain.game.dto.response;
+
+import io.f1.backend.domain.quiz.dto.GameQuestionResponse;
+import java.util.List;
+
+public record GameStartResponse(List<GameQuestionResponse> questions) { }

backend/src/main/java/io/f1/backend/domain/game/model/Room.java

@@ -39,4 +39,8 @@ public Room(Long id, RoomSetting roomSetting, GameSetting gameSetting, Player ho
     public void updateHost(Player nextHost) {
         this.host = nextHost;
     }
+
+    public void gameStart() {
+        this.state = RoomState.PLAYING;
+    }
 }

backend/src/main/java/io/f1/backend/domain/game/websocket/GameSocketController.java

@@ -5,6 +5,9 @@
 import io.f1.backend.domain.game.dto.RoomExitData;
 import io.f1.backend.domain.game.dto.RoomInitialData;
 
+import io.f1.backend.domain.game.dto.request.GameStartRequest;
+import io.f1.backend.domain.game.dto.response.GameStartResponse;
+import io.f1.backend.domain.quiz.app.QuizService;
 import lombok.RequiredArgsConstructor;
 
 import org.springframework.messaging.Message;
@@ -19,6 +22,7 @@ public class GameSocketController {
 
     private final MessageSender messageSender;
     private final RoomService roomService;
+    private final QuizService quizService;
 
     @MessageMapping("/room/enter/{roomId}")
     public void roomEnter(@DestinationVariable Long roomId, Message<?> message) {
@@ -55,6 +59,20 @@ public void exitRoom(@DestinationVariable Long roomId, Message<?> message) {
         }
     }
 
+    @MessageMapping("/room/start/{roomId}")
+    public void gameStart(@DestinationVariable Long roomId, Message<GameStartRequest> message) {
+
+        Long quizId = message.getPayload().quizId();
+
+        Integer round = roomService.checkGameSetting(roomId, quizId);
+
+        // TODO : 라운드 수만큼 랜덤하게 문제 주기..!
+        GameStartResponse questions = quizService.getQuestionsWithoutAnswer(quizId, round);
+
+        roomService.gameStart(roomId);
+
+    }
+
     private static String getSessionId(Message<?> message) {
         StompHeaderAccessor accessor = StompHeaderAccessor.wrap(message);
         return accessor.getSessionId();

backend/src/main/java/io/f1/backend/domain/quiz/app/QuizService.java

@@ -4,9 +4,11 @@
 
 import static java.nio.file.Files.deleteIfExists;
 
+import io.f1.backend.domain.game.dto.response.GameStartResponse;
 import io.f1.backend.domain.question.app.QuestionService;
 import io.f1.backend.domain.question.dto.QuestionRequest;
 import io.f1.backend.domain.quiz.dao.QuizRepository;
+import io.f1.backend.domain.quiz.dto.GameQuestionResponse;
 import io.f1.backend.domain.quiz.dto.QuizCreateRequest;
 import io.f1.backend.domain.quiz.dto.QuizCreateResponse;
 import io.f1.backend.domain.quiz.dto.QuizListPageResponse;
@@ -205,6 +207,7 @@ public Long getQuizMinId() {
         return quizRepository.getQuizMinId();
     }
 
+    @Transactional(readOnly = true)
     public QuizQuestionListResponse getQuizWithQuestions(Long quizId) {
         Quiz quiz =
                 quizRepository
@@ -213,4 +216,17 @@ public QuizQuestionListResponse getQuizWithQuestions(Long quizId) {
 
         return quizToQuizQuestionListResponse(quiz);
     }
+
+    @Transactional(readOnly = true)
+    public GameStartResponse getQuestionsWithoutAnswer(Long quizId, Integer round) {
+        Quiz quiz =
+            quizRepository
+                .findById(quizId)
+                .orElseThrow(() -> new NoSuchElementException("존재하지 않는 퀴즈입니다."));
+
+
+
+        return toGameStartResponse(quiz);
+    }
+
 }

backend/src/main/java/io/f1/backend/domain/quiz/dto/GameQuestionResponse.java

@@ -0,0 +1,3 @@
+package io.f1.backend.domain.quiz.dto;
+
+public record GameQuestionResponse(Long id, String question) { }

backend/src/main/java/io/f1/backend/domain/quiz/mapper/QuizMapper.java

@@ -1,7 +1,9 @@
 package io.f1.backend.domain.quiz.mapper;
 
+import io.f1.backend.domain.game.dto.response.GameStartResponse;
 import io.f1.backend.domain.question.dto.QuestionResponse;
 import io.f1.backend.domain.question.entity.Question;
+import io.f1.backend.domain.quiz.dto.GameQuestionResponse;
 import io.f1.backend.domain.quiz.dto.QuizCreateRequest;
 import io.f1.backend.domain.quiz.dto.QuizCreateResponse;
 import io.f1.backend.domain.quiz.dto.QuizListPageResponse;
@@ -83,4 +85,17 @@ public static QuizQuestionListResponse quizToQuizQuestionListResponse(Quiz quiz)
                 quiz.getQuestions().size(),
                 questionsToQuestionResponses(quiz.getQuestions()));
     }
+
+    public static List<GameQuestionResponse> toGameQuestionResponseList(List<Question> questions) {
+        return questions.stream()
+            .map(QuizMapper::toGameQuestionResponse).toList();
+    }
+
+    public static GameQuestionResponse toGameQuestionResponse(Question question) {
+        return new GameQuestionResponse(question.getId(), question.getTextQuestion().getContent());
+    }
+
+    public static GameStartResponse toGameStartResponse(Quiz quiz) {
+        return new GameStartResponse(toGameQuestionResponseList(quiz.getQuestions()));
+    }
 }