feat: 添加房间详情 API

src/main/java/com/webgame/webgamebackend/service/impl/GameServiceImpl.java

@@ -9,6 +9,7 @@ import com.webgame.webgamebackend.repository.*;
 import com.webgame.webgamebackend.common.event.SseEventPublisher;
 import com.webgame.webgamebackend.common.event.SseEventType;
 import com.webgame.webgamebackend.service.GameService;
+import com.webgame.webgamebackend.service.GomokuGameService;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
@@ -427,6 +428,65 @@ public class GameServiceImpl implements GameService {
         }
     }
 
+    @Override
+    public RoomDetailResponse getRoomDetail(String roomId) {
+        GameRoomEntity room = gameRoomRepository.findById(roomId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ROOM_NOT_FOUND));
+
+        GameConfigEntity gameConfig = gameConfigRepository.findByGameId(room.getGameId())
+                .orElseThrow(() -> new BusinessException(ErrorCode.GAME_NOT_FOUND));
+
+        // 组装玩家详情（含座位号和准备状态）
+        List<RoomPlayerEntity> roomPlayers = roomPlayerRepository.findByRoomId(roomId);
+        List<String> userIds = roomPlayers.stream()
+                .map(RoomPlayerEntity::getUserId).toList();
+        Map<String, UserEntity> userMap = userRepository.findByAccountIdIn(userIds).stream()
+                .collect(Collectors.toMap(u -> u.getAccount().getId(), u -> u));
+
+        List<RoomDetailResponse.RoomPlayerDetail> playerDetails = roomPlayers.stream()
+                .map(rp -> {
+                    UserEntity user = userMap.get(rp.getUserId());
+                    return new RoomDetailResponse.RoomPlayerDetail(
+                            rp.getUserId(),
+                            user != null ? user.getAvatar() : "",
+                            user != null ? user.getNickName() : "未知玩家",
+                            rp.getSeatNumber(),
+                            rp.getReadyStatus()
+                    );
+                }).toList();
+
+        String creatorName = getNickname(room.getCreatorId());
+
+        // 对局中或有对局记录时，查询棋盘状态
+        int[][] boardState = null;
+        String currentTurn = null;
+        List<RoomDetailResponse.MoveItem> moves = List.of();
+
+        if ("playing".equals(room.getStatus()) || "finished".equals(room.getStatus())) {
+            // 查询走棋记录
+            List<GameMoveEntity> moveEntities = gameMoveRepository.findByRoomIdOrderByMoveIndexAsc(roomId);
+            moves = moveEntities.stream()
+                    .map(m -> new RoomDetailResponse.MoveItem(
+                            m.getMoveIndex(), m.getPlayerId(), m.getRowNum(), m.getColNum()))
+                    .toList();
+
+            // 从走棋记录重建棋盘
+            boardState = GomokuGameService.rebuildBoard(moveEntities, room.getMaxPlayers());
+            // currentTurn 由服务端运行时管理，HTTP 快照中暂不返回
+        }
+
+        log.info("[游戏服务] 获取房间详情, roomId={}, status={}, 玩家数={}",
+                roomId, room.getStatus(), playerDetails.size());
+
+        return new RoomDetailResponse(
+                room.getId(), room.getName(), room.getGameId(),
+                gameConfig.getIcon(), gameConfig.getName(),
+                room.getMaxPlayers(), room.getMode(), room.getStakes(),
+                room.getStatus(), room.getCreatorId(), creatorName,
+                room.getAllowSpectate(), playerDetails, boardState, currentTurn, moves
+        );
+    }
+
     // ==================== 私有辅助方法 ====================
 
     /**