dm-12

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

@@ -1,4 +1,52 @@
 package com.example.login_v3.home.Message.ViewModel.Detail
 
-class Message_Messaging_ViewModel {
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+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
+
+
+sealed interface MessagesUiState {
+    object Loading : MessagesUiState
+    data class Success(val messages: List<Message>) : MessagesUiState
+    data class Error(val message: String) : MessagesUiState
+}
+
+@HiltViewModel
+class ChatViewModel @Inject constructor(
+    private val repository: ChatRoomsRepository
+) : ViewModel() {
+
+    // 內部的可變狀態，預設為 Loading
+    private val _uiState = mutableStateOf<MessagesUiState>(MessagesUiState.Loading)
+
+    // 公開給 Compose UI 讀取的唯讀狀態
+    val uiState: State<MessagesUiState> = _uiState
+
+    /**
+     * 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
+                    _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")
+                }
+        }
+    }
 }