Update app.py

app.py

@@ -3,6 +3,7 @@ from huggingface_hub import hf_hub_download
 from llama_cpp import Llama
 from llama_cpp_agent import LlamaCppAgent, MessagesFormatterType
 from llama_cpp_agent.providers import LlamaCppPythonProvider
+from llama_cpp_agent.chat_history import BasicChatHistory
 from llama_cpp_agent.chat_history.messages import UserMessage, AssistantMessage
 
 # ⬇️ دانلود مدل
@@ -40,16 +41,17 @@ def respond(message, chat_history, system_message, max_tokens, temperature, top_
     settings.repeat_penalty = repeat_penalty
     settings.stream = True
 
-    # رفرش سابقه چت
     if chat_history is None:
         chat_history = []
 
-    messages = []
+    # ✅ استفاده صحیح از BasicChatHistory
+    messages = BasicChatHistory()
+
     for msg in chat_history:
         if msg["role"] == "user":
-            messages.append(UserMessage(msg["content"]))
+            messages.add_message(UserMessage(msg["content"]))
         elif msg["role"] == "assistant":
-            messages.append(AssistantMessage(msg["content"]))
+            messages.add_message(AssistantMessage(msg["content"]))
 
     # گرفتن استریم پاسخ
     stream = agent.get_chat_response(