dm-14

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

@@ -10,11 +10,14 @@ import javax.inject.Singleton
 class ChatRoomsRepository @Inject constructor(
     private val api: TecnologiaApi
 ) {
+
     suspend fun fetchRooms(): Result<RoomListResponse> {
         return try {
             val response = api.getChatRooms()
-            if (response.isSuccessful && response.body() != null) {
+            if (response.isSuccessful) {
-                Result.success(response.body()!!)
+                // 使用 body() ?: return ... 可以減少一層 if 巢狀結構
+                val body = response.body() ?: return Result.failure(Exception("Rooms response body is null"))
+                Result.success(body)
             } else {
                 Result.failure(Exception("Error code: ${response.code()}"))
             }
@@ -25,19 +28,23 @@ class ChatRoomsRepository @Inject constructor(
 
     suspend fun getChatMessages(roomId: String): Result<MessageResponse> {
         return try {
-            val response = api.getChatMessages(roomId) // 確保 TecnologiaApi 裡有 getChatMessages 方法
+            val response = api.getChatMessages(roomId)
 
             if (response.isSuccessful) {
                 val body = response.body()
                 if (body != null) {
                     Result.success(body)
                 } else {
+                    // 如果後端 200 OK 但給空身體，這裏處理
                     Result.failure(Exception("回應身體為空 (Empty response body)"))
                 }
             } else {
-                Result.failure(Exception("網路請求失敗，錯誤碼: ${response.code()}"))
+                // 建議把後端的錯誤訊息也抓出來（如果後端有寫 error body 的話）
+                val errorMsg = response.errorBody()?.string() ?: "未知錯誤"
+                Result.failure(Exception("網路請求失敗，錯誤碼: ${response.code()}, 訊息: $errorMsg"))
             }
         } catch (e: Exception) {
+            // 捕捉網路斷線 (IOException) 或解析失敗 (JsonDataException) 等狀況
             Result.failure(e)
         }
     }

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

@@ -7,9 +7,10 @@ import com.example.login_v3.data.repository.dm.ChatRoomsRepository
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.launch
 import javax.inject.Inject
-import androidx.compose.runtime.State
-import androidx.compose.runtime.mutableStateOf
 import com.example.login_v3.data.api.api_class.Message
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
 
 
 sealed interface MessagesUiState {
@@ -23,28 +24,22 @@ class ChatViewModel @Inject constructor(
     private val repository: ChatRoomsRepository
 ) : ViewModel() {
 
-    // 內部的可變狀態，預設為 Loading
+    // 1. 使用 MutableStateFlow，並設定初始值
-    private val _uiState = mutableStateOf<MessagesUiState>(MessagesUiState.Loading)
+    private val _uiState = MutableStateFlow<MessagesUiState>(MessagesUiState.Loading)
 
-    // 公開給 Compose UI 讀取的唯讀狀態
+    // 2. 使用 asStateFlow() 公開唯讀的 StateFlow
-    val uiState: State<MessagesUiState> = _uiState
+    val uiState: StateFlow<MessagesUiState> = _uiState.asStateFlow()
 
-    /**
-     * 根據 roomId 獲取聊天訊息
-     */
     fun loadMessages(roomId: String) {
         viewModelScope.launch {
-            // 切換回載入中狀態（適用於切換房間或重新整理時）
             _uiState.value = MessagesUiState.Loading
 
-            // 呼叫你的 Repository 方法
             repository.getChatMessages(roomId)
                 .onSuccess { response ->
-                    // 成功：將訊息列表塞入 Success 狀態
+                    // 3. 更新 Flow 的值
                     _uiState.value = MessagesUiState.Success(messages = response.messages)
                 }
                 .onFailure { exception ->
-                    // 失敗：擷取錯誤訊息並塞入 Error 狀態
                     _uiState.value = MessagesUiState.Error(message = exception.message ?: "未知錯誤")
                 }
         }