Update app.py

app.py

@@ -85,26 +85,35 @@ def get_llm():
         temperature=0.3,
     )
 
-# ── Chat — history is list of (user_str, bot_str) tuples ─────────────────────
+# ── Chat — history is list of {"role": ..., "content": ...} dicts ─────────────
 
 def chat(user_message: str, history: list):
     if not user_message.strip():
         return "", history
 
     lc_messages = [SystemMessage(content=SYSTEM_PROMPT)]
-    for human, assistant in history:
-        lc_messages.append(HumanMessage(content=human))
-        lc_messages.append(AIMessage(content=assistant))
+    for msg in history:
+        if msg["role"] == "user":
+            lc_messages.append(HumanMessage(content=msg["content"]))
+        elif msg["role"] == "assistant":
+            lc_messages.append(AIMessage(content=msg["content"]))
     lc_messages.append(HumanMessage(content=user_message))
 
     response = get_llm().invoke(lc_messages)
-    return "", history + [(user_message, response.content)]
+    return "", history + [
+        {"role": "user", "content": user_message},
+        {"role": "assistant", "content": response.content},
+    ]
 
 
 def use_sample(question: str, history: list):
     clean = question.split(" ", 1)[-1]
     return chat(clean, history)
 
+
+def clear_chat():
+    return [], ""
+
 # ── UI ────────────────────────────────────────────────────────────────────────
 
 with gr.Blocks(title="ShopAssist FAQ") as demo:
@@ -141,7 +150,7 @@ with gr.Blocks(title="ShopAssist FAQ") as demo:
 
     txt.submit(chat, [txt, chatbot], [txt, chatbot])
     send.click(chat, [txt, chatbot], [txt, chatbot])
-    clear.click(lambda: ([], ""), outputs=[chatbot, txt])
+    clear.click(clear_chat, outputs=[chatbot, txt])
 
 if __name__ == "__main__":
     demo.launch(theme=gr.themes.Soft())