dm-51

app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt

@@ -247,4 +247,25 @@ class ChatRoomsRepository @Inject constructor(
             Result.failure(e)
         }
     }
+
+    // 新增訊息的 Emoji 反應
+    suspend fun addMessageReaction(
+        roomId: String,
+        messageId: String,
+        emoji: String
+    ): Result<Unit> {
+        return try {
+            val response = api.addMessageReaction(roomId, messageId, emoji)
+
+            if (response.isSuccessful) {
+                // 204 成功時沒有 body，直接回傳 Unit
+                Result.success(Unit)
+            } else {
+                val errorMsg = response.errorBody()?.string() ?: "未知錯誤"
+                Result.failure(Exception("新增反應失敗，錯誤碼: ${response.code()}, 訊息: $errorMsg"))
+            }
+        } catch (e: Exception) {
+            Result.failure(e)
+        }
+    }
 }

app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Messaging_ViewModel.kt

@@ -193,9 +193,7 @@ class ChatViewModel @Inject constructor(
     private val _reactionUsersState = MutableStateFlow<ReactionUsersState>(ReactionUsersState.Idle)
     val reactionUsersState: StateFlow<ReactionUsersState> = _reactionUsersState.asStateFlow()
 
-    /**
-     * 💡 新增：載入點擊特定 Emoji 的使用者名單
-     */
+    //get emoji reaction
     fun loadMessageReactionUsers(roomId: String, messageId: String, emoji: String) {
         viewModelScope.launch {
             _reactionUsersState.value = ReactionUsersState.Loading
@@ -214,6 +212,21 @@ class ChatViewModel @Inject constructor(
             }
         }
     }
+    //add emoji reaction
+    fun addMessageReaction(roomId: String, messageId: String, emoji: String) {
+        viewModelScope.launch {
+            val result = repository.addMessageReaction(roomId, messageId, emoji)
+
+            result.onSuccess {
+                // 😎【超讚體驗優化】：點擊成功後，除了通知後端，
+                // 也可以選擇直接呼叫 loadMessages(roomId) 來重新拉取最新帶有按讚數量的訊息列表
+                loadMessages(roomId)
+            }.onFailure { error ->
+                Log.e("ChatViewModel", "Add reaction failed", error)
+                // 這裡可以依需求決定要不要用 Toast 提示使用者點擊失敗
+            }
+        }
+    }
 
     // 💡 請確保這段程式碼有確實待在 ChatViewModel 裡面
     fun resetReactionUsersState() {