# if chat_history is not none, append role, content to messages

app.py

@@ -527,10 +527,29 @@ def respond(user_message, df_string_output, chat_history):
         如果學生的問題與資料文本無關，請告訴學生你無法回答超出範圍的問題
     """
     messages = [
-        {"role": "system", "content": sys_content},
-        {"role": "user", "content": user_message}
+        {"role": "system", "content": sys_content}
     ]
 
+    # if chat_history is not none, append role, content to messages
+    # chat_history = [(user, assistant), (user, assistant), ...]
+    # In the list, first one is user, then assistant
+    if chat_history is not None:
+        # 如果超過10則訊息，只保留最後10則訊息
+        if len(chat_history) > 10:
+            chat_history = chat_history[-10:]
+
+        for chat in chat_history:
+            old_messages = [
+                {"role": "user", "content": chat[0]},
+                {"role": "assistant", "content": chat[1]}
+            ]
+            messages += old_messages
+
+    else:
+        pass
+        
+    messages.append({"role": "user", "content": user_message})
+
     print("=====messages=====")
     print(messages)
     print("=====messages=====")