Auto-assign room image order on upload

src/main/kotlin/com/android/trisolarisserver/controller/RoomImages.kt

@@ -58,8 +58,6 @@ class RoomImages(
         @PathVariable roomId: UUID,
         @AuthenticationPrincipal principal: MyPrincipal?,
         @RequestParam("file") file: MultipartFile,
-        @RequestParam(required = false) roomSortOrder: Int?,
-        @RequestParam(required = false) roomTypeSortOrder: Int?,
         @RequestParam(required = false) tags: List<String>?
     ): RoomImageResponse {
         requirePrincipal(principal)
@@ -76,6 +74,8 @@ class RoomImages(
             throw ResponseStatusException(HttpStatus.BAD_REQUEST, ex.message ?: "Invalid image")
         }
 
+        val nextRoomSortOrder = roomImageRepo.findMaxRoomSortOrder(roomId) + 1
+        val nextRoomTypeSortOrder = roomImageRepo.findMaxRoomTypeSortOrder(room.roomType.code) + 1
         val image = RoomImage(
             property = room.property,
             room = room,
@@ -85,8 +85,8 @@ class RoomImages(
             sizeBytes = stored.sizeBytes,
             roomTypeCode = room.roomType.code,
             tags = tags?.toMutableSet() ?: mutableSetOf(),
-            roomSortOrder = roomSortOrder ?: 0,
-            roomTypeSortOrder = roomTypeSortOrder ?: 0
+            roomSortOrder = nextRoomSortOrder,
+            roomTypeSortOrder = nextRoomTypeSortOrder
         )
         return roomImageRepo.save(image).toResponse(publicBaseUrl)
     }