From f8799511de95b0fda10e653584e92157478098aa Mon Sep 17 00:00:00 2001
From: Eric85710 <ericchen87887@gmail.com>
Date: Wed, 27 May 2026 05:13:59 +0800
Subject: [PATCH] dm-48

---
 .../Detail/Message_Messaging_ViewModel.kt     | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Messaging_ViewModel.kt b/app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Messaging_ViewModel.kt
index 9753152..ef8b1df 100644
--- a/app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Messaging_ViewModel.kt
+++ b/app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Messaging_ViewModel.kt
@@ -19,6 +19,13 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.first
 
+//emoji reaction state
+sealed class ReactionUsersState {
+    object Idle : ReactionUsersState()                                          // 沒點擊時的閒置狀態
+    object Loading : ReactionUsersState()                                       // 載入中
+    data class Success(val users: List<String>) : ReactionUsersState()          // 成功取得名單
+    data class Error(val message: String) : ReactionUsersState()                // 取得失敗
+}
 
 //message sending state
 sealed class SendMessageState {
@@ -183,6 +190,31 @@ 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
+     */
+    fun loadMessageReactionUsers(roomId: String, messageId: String, emoji: String) {
+        viewModelScope.launch {
+            _reactionUsersState.value = ReactionUsersState.Loading
+
+            val result = repository.getMessageReactionUsers(
+                roomId = roomId,
+                messageId = messageId,
+                emoji = emoji
+            )
+
+            result.onSuccess { response ->
+                _reactionUsersState.value = ReactionUsersState.Success(response.users)
+            }.onFailure { error ->
+                Log.e("ChatViewModel", "Get reaction users failed", error)
+                _reactionUsersState.value = ReactionUsersState.Error(error.message ?: "無法取得按讚名單")
+            }
+        }
+    }
+
     //新增：重設發送狀態的 function
     fun resetSendMessageState() {
         _sendMessageState.value = SendMessageState.Idle