Update app.py

app.py

@@ -1,7 +1,7 @@
 import gradio as gr
-from pdf_bot import create_qa_chain_from_pdf
+from app import create_qa_chain_from_pdf
 
-qa_chain = None  # Global chain reference
+qa_chain = None
 
 css = """
 #chatbot { 
@@ -27,22 +27,25 @@ def upload_pdf(pdf_file_path):
         qa_chain = create_qa_chain_from_pdf(pdf_file_path)
         return gr.update(visible=True), f"✅ PDF `{pdf_file_path.split('/')[-1]}` loaded successfully!"
     except Exception as e:
+        qa_chain = None
         return gr.update(visible=False), f"❌ Error: {e}"
 
 def respond(message, chat_history):
     global qa_chain
     if qa_chain is None:
-        return message, chat_history + [{"role": "assistant", "content": "⚠️ Please upload a PDF first."}]
-    
+        chat_history.append(("User", message))
+        chat_history.append(("Bot", "⚠️ Please upload a PDF first."))
+        return "", chat_history
+
     try:
         result = qa_chain({"query": message})
         answer = result["result"]
-        chat_history.append({"role": "user", "content": message})
-        chat_history.append({"role": "assistant", "content": answer})
+        chat_history.append(("User", message))
+        chat_history.append(("Bot", answer))
         return "", chat_history
     except Exception as e:
-        chat_history.append({"role": "user", "content": message})
-        chat_history.append({"role": "assistant", "content": f"❌ Error: {e}"})
+        chat_history.append(("User", message))
+        chat_history.append(("Bot", f"❌ Error: {e}"))
         return "", chat_history
 
 def create_interface():
@@ -54,8 +57,7 @@ def create_interface():
 
         pdf_input = gr.File(label="Upload PDF", type="filepath", file_types=[".pdf"])
         status = gr.Markdown()
-
-        chatbot = gr.Chatbot(elem_id="chatbot", visible=False, type="messages")  # ✅ fixed type here
+        chatbot = gr.Chatbot(elem_id="chatbot", visible=False)
 
         examples = [
             "What are the admission requirements?",