created conversational functcionality

app.py

@@ -213,11 +213,33 @@ ANSWER: {res['question']['output']}
 {res['conversation']}
 """
 
+# === Stateful Gradio UI ===
+def stateful_ui_fn(user_input, history):
+    # Initialize or retrieve history list
+    history = history or []
+    # Append the new patient utterance
+    history.append(f"Patient: {user_input}")
+    # Run one round of simulation
+    res = simulate_interaction(user_input)
+    # Extract last doctor line from the fresh conversation
+    last_line = res['conversation'].splitlines()[-1]
+    # Append the doctor's new line
+    history.append(last_line)
+    # Build the displayed conversation
+    convo = "\n".join(history)
+    # Return both the display text and updated history
+    return convo, history
 
 demo = gr.Interface(
-    fn=ui_fn,
-    inputs=gr.Textbox(label="Patient Response"),
-    outputs=gr.Textbox(label="Doctor Simulation Output"),
+    fn=stateful_ui_fn,
+    inputs=[
+        gr.Textbox(label="Patient Response"),
+        gr.State([]),  # holds the conversation history
+    ],
+    outputs=[
+        gr.Textbox(label="Doctor Simulation Output"),
+        gr.State(),    # returns the updated history
+    ],
     title="🧠 AI Doctor Multi-Agent Reasoning",
 )