feat(character-comment): 댓글/대댓글 API

- 커서를 추가하여 페이징 처리

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentController.kt

@@ -54,12 +54,13 @@ class CharacterCommentController(
     fun listComments(
         @PathVariable characterId: Long,
         @RequestParam(required = false, defaultValue = "20") limit: Int,
+        @RequestParam(required = false) cursor: Long?,
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?
     ) = run {
         if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
         if (member.auth == null) throw SodaException("본인인증을 하셔야 합니다.")
 
-        val data = service.listComments(imageHost, characterId, limit)
+        val data = service.listComments(imageHost, characterId, cursor, limit)
         ApiResponse.ok(data)
     }
 
@@ -68,13 +69,14 @@ class CharacterCommentController(
         @PathVariable characterId: Long,
         @PathVariable commentId: Long,
         @RequestParam(required = false, defaultValue = "20") limit: Int,
+        @RequestParam(required = false) cursor: Long?,
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?
     ) = run {
         if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
         if (member.auth == null) throw SodaException("본인인증을 하셔야 합니다.")
 
         // characterId는 서비스 내부 검증(원본 댓글과 캐릭터 일치)에서 검증됨
-        val data = service.getReplies(imageHost, commentId, limit)
+        val data = service.getReplies(imageHost, commentId, cursor, limit)
         ApiResponse.ok(data)
     }
 }

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentDto.kt

@@ -41,7 +41,8 @@ data class CharacterReplyResponse(
 
 data class CharacterCommentRepliesResponse(
     val original: CharacterCommentResponse,
-    val replies: List<CharacterReplyResponse>
+    val replies: List<CharacterReplyResponse>,
+    val cursor: Long?
 )
 
 // 댓글 리스트 조회 Response 컨테이너
@@ -50,5 +51,6 @@ data class CharacterCommentRepliesResponse(
 
 data class CharacterCommentListResponse(
     val totalCount: Int,
-    val comments: List<CharacterCommentResponse>
+    val comments: List<CharacterCommentResponse>,
+    val cursor: Long?
 )

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentRepository.kt

@@ -9,8 +9,22 @@ interface CharacterCommentRepository : JpaRepository<CharacterComment, Long> {
         pageable: Pageable
     ): List<CharacterComment>
 
+    fun findByChatCharacter_IdAndIsActiveTrueAndParentIsNullAndIdLessThanOrderByCreatedAtDesc(
+        chatCharacterId: Long,
+        id: Long,
+        pageable: Pageable
+    ): List<CharacterComment>
+
     fun countByParent_IdAndIsActiveTrue(parentId: Long): Int
+
     fun findByParent_IdAndIsActiveTrueOrderByCreatedAtDesc(parentId: Long, pageable: Pageable): List<CharacterComment>
+
+    fun findByParent_IdAndIsActiveTrueAndIdLessThanOrderByCreatedAtDesc(
+        parentId: Long,
+        id: Long,
+        pageable: Pageable
+    ): List<CharacterComment>
+
     fun findFirstByChatCharacter_IdAndIsActiveTrueOrderByCreatedAtDesc(chatCharacterId: Long): CharacterComment?
 
     // 전체(상위+답글) 활성 댓글 총 개수

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentService.kt

@@ -83,31 +83,67 @@ class CharacterCommentService(
     }
 
     @Transactional(readOnly = true)
-    fun listComments(imageHost: String, characterId: Long, limit: Int = 20): CharacterCommentListResponse {
+    fun listComments(
+        imageHost: String,
+        characterId: Long,
+        cursor: Long?,
+        limit: Int = 20
+    ): CharacterCommentListResponse {
         val pageable = PageRequest.of(0, limit)
-        val comments = commentRepository.findByChatCharacter_IdAndIsActiveTrueAndParentIsNullOrderByCreatedAtDesc(
+        val comments = if (cursor == null) {
+            commentRepository.findByChatCharacter_IdAndIsActiveTrueAndParentIsNullOrderByCreatedAtDesc(
                 characterId,
                 pageable
             )
+        } else {
+            commentRepository.findByChatCharacter_IdAndIsActiveTrueAndParentIsNullAndIdLessThanOrderByCreatedAtDesc(
+                characterId,
+                cursor,
+                pageable
+            )
+        }
+
         val items = comments.map { toCommentResponse(imageHost, it) }
         val total = getTotalCommentCount(characterId)
+        val nextCursor = if (items.size == limit) items.lastOrNull()?.commentId else null
+
         return CharacterCommentListResponse(
             totalCount = total,
-            comments = items
+            comments = items,
+            cursor = nextCursor
         )
     }
 
     @Transactional(readOnly = true)
-    fun getReplies(imageHost: String, commentId: Long, limit: Int = 20): CharacterCommentRepliesResponse {
-        val original = commentRepository.findById(commentId).orElseThrow { SodaException("댓글을 찾을 수 없습니다.") }
+    fun getReplies(
+        imageHost: String,
+        commentId: Long,
+        cursor: Long?,
+        limit: Int = 20
+    ): CharacterCommentRepliesResponse {
+        val original = commentRepository.findById(commentId).orElseThrow {
+            SodaException("댓글을 찾을 수 없습니다.")
+        }
         if (!original.isActive) throw SodaException("비활성화된 댓글입니다.")
 
         val pageable = PageRequest.of(0, limit)
-        val replies = commentRepository.findByParent_IdAndIsActiveTrueOrderByCreatedAtDesc(commentId, pageable)
+        val replies = if (cursor == null) {
+            commentRepository.findByParent_IdAndIsActiveTrueOrderByCreatedAtDesc(commentId, pageable)
+        } else {
+            commentRepository.findByParent_IdAndIsActiveTrueAndIdLessThanOrderByCreatedAtDesc(
+                commentId,
+                cursor,
+                pageable
+            )
+        }
+
+        val items = replies.map { toReplyResponse(imageHost, it) }
+        val nextCursor = if (items.size == limit) items.lastOrNull()?.replyId else null
 
         return CharacterCommentRepliesResponse(
             original = toCommentResponse(imageHost, original, 0),
-            replies = replies.map { toReplyResponse(imageHost, it) }
+            replies = items,
+            cursor = nextCursor
         )
     }