CLAP-399 Refactor: 첨부파일 개수 저장 로직 분리

Author: parkjaehak

src/main/java/clap/server/application/service/task/UpdateTaskService.java

@@ -63,20 +63,15 @@ public void updateTask(Long requesterId, Long taskId, UpdateTaskRequest request,
         memberService.findActiveMember(requesterId);
         Category category = categoryService.findById(request.categoryId());
         Task task = taskService.findById(taskId);
+        int attachmentCount = getAttachmentCount(request, files, task);
 
-        int attachmentToAdd = files==null? 0 : files.size();
-        int attachmentCount = task.getAttachmentCount() - request.attachmentsToDelete().size() + attachmentToAdd;
-        if (attachmentCount > TASK_MAX_FILE_COUNT) {
-            throw new ApplicationException(TaskErrorCode.FILE_COUNT_EXCEEDED);
-        }
         if (!request.attachmentsToDelete().isEmpty()) {
             List<Attachment> attachmentsToDelete = validateAndGetAttachments(request.attachmentsToDelete(), task);
             attachmentsToDelete.stream()
                     .peek(Attachment::softDelete)
                     .forEach(commandAttachmentPort::save);
-            updateAttachments(files, task);
         }
-        else {
+        if (files != null) {
             updateAttachments(files, task);
         }
         task.updateTask(requesterId, category, request.title(), request.description(), attachmentCount);
@@ -134,11 +129,18 @@ public void updateTaskLabel(Long taskId, Long memberId, UpdateTaskLabelRequest r
     }
 
     private void updateAttachments(List<MultipartFile> files, Task task) {
-        if (files != null) {
-            List<String> fileUrls = s3UploadPort.uploadFiles(FilePathConstants.TASK_FILE, files);
-            List<Attachment> attachments = AttachmentMapper.toTaskAttachments(task, files, fileUrls);
-            commandAttachmentPort.saveAll(attachments);
+        List<String> fileUrls = s3UploadPort.uploadFiles(FilePathConstants.TASK_FILE, files);
+        List<Attachment> attachments = AttachmentMapper.toTaskAttachments(task, files, fileUrls);
+        commandAttachmentPort.saveAll(attachments);
+    }
+
+    private static int getAttachmentCount(UpdateTaskRequest request, List<MultipartFile> files, Task task) {
+        int attachmentToAdd = files == null ? 0 : files.size();
+        int attachmentCount = task.getAttachmentCount() - request.attachmentsToDelete().size() + attachmentToAdd;
+        if (attachmentCount > TASK_MAX_FILE_COUNT) {
+            throw new ApplicationException(TaskErrorCode.FILE_COUNT_EXCEEDED);
         }
+        return attachmentCount;
     }
 
     private List<Attachment> validateAndGetAttachments(List<Long> attachmentIdsToDelete, Task task) {