From bcd7b5f141861a97e8c82cc2458c5ed3f19fa1df Mon Sep 17 00:00:00 2001
From: Eric85710 <ericchen87887@gmail.com>
Date: Sun, 7 Jun 2026 05:14:02 +0800
Subject: [PATCH] dm-91

---
 app/build.gradle.kts                          |  4 +++
 .../Message/ViewModel/Detail/Message_Cache.kt | 34 +++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Cache.kt

diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 3a7973e..f9bcaf9 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -95,4 +95,8 @@ dependencies {
     implementation("androidx.emoji2:emoji2:$emoji2Version")
     implementation("androidx.emoji2:emoji2-bundled:$emoji2Version") // 自帶字型包
 
+    val roomVersion = "2.6.1" // 可以使用目前穩定的 2.6.1 或最新版本
+    implementation("androidx.room:room-runtime:$roomVersion")
+    implementation("androidx.room:room-ktx:$roomVersion") // 支援 Flow 必須要加這行
+    ksp("androidx.room:room-compiler:$roomVersion")       // 使用 KSP 來編譯 Room 註解
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Cache.kt b/app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Cache.kt
new file mode 100644
index 0000000..204680e
--- /dev/null
+++ b/app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Cache.kt
@@ -0,0 +1,34 @@
+package com.example.login_v3.home.Message.ViewModel.Detail
+
+import androidx.room.Dao
+import androidx.room.Entity
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.PrimaryKey
+import kotlinx.coroutines.flow.Flow
+import androidx.room.Query
+
+enum class MessageStatus { SENDING, SUCCESS, FAILED }
+
+@Entity(tableName = "messages")
+data class MessageEntity(
+    @PrimaryKey val id: String, // 臨時訊息可以用 UUID.randomUUID().toString()
+    val roomId: String,
+    val content: String,
+    val senderId: String,
+    val timestamp: Long,
+    val status: MessageStatus // 👈 核心：用來控制 UI 顯示樣式
+)
+
+@Dao
+interface MessageDao {
+    // 💡 監聽特定聊天室的訊息流
+    @Query("SELECT * FROM messages WHERE roomId = :roomId ORDER BY timestamp ASC")
+    fun getMessagesFlow(roomId: String): Flow<List<MessageEntity>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertOrUpdate(message: MessageEntity)
+
+    @Query("DELETE FROM messages WHERE id = :id")
+    suspend fun deleteById(id: String)
+}
\ No newline at end of file