Update app_2.py

app_2.py

@@ -7,10 +7,11 @@ client = genai.Client(api_key=os.environ["GEMINI_API_KEY"])
 MODEL = "gemini-3.1-flash-lite-preview"
 
 def respond(message, history, state):
-    # state bleibt server-side (darf Python-Objekte enthalten)
+    # history: [{"role": "user"/"assistant", "content": "..."} , ...]
     if state is None:
         state = {"chat": client.chats.create(model=MODEL), "lock": threading.Lock()}
 
+    history = history or []
     text = (message or {}).get("text") or ""
     files = (message or {}).get("files") or []
 
@@ -25,24 +26,28 @@ def respond(message, history, state):
             parts.append(types.Part.from_bytes(data=f.read(), mime_type=mime))
 
     if not parts:
-        # nichts gesendet -> keine Änderung
         yield history, state
         return
 
-    # User Nachricht in UI-Historie
-    history = (history or []) + [[text if text else "[Datei]", ""]]
+    # UI: user msg hinzufügen
+    user_label = text if text else "[Datei]"
+    history.append({"role": "user", "content": user_label})
+    # UI: assistant placeholder
+    history.append({"role": "assistant", "content": ""})
+    yield history, state
 
+    # Gemini: send + stream (Historie steckt im state["chat"])
     with state["lock"]:
         out = ""
         for chunk in state["chat"].send_message_stream(parts):
             if getattr(chunk, "text", None):
                 out += chunk.text
-                history[-1][1] = out
+                history[-1]["content"] = out
                 yield history, state
 
 with gr.Blocks() as demo:
     gr.Markdown("# Gemini Thinking AI")
-    chatbot = gr.Chatbot(height=600)
+    chatbot = gr.Chatbot(height=600)  # messages-format default
     msg = gr.MultimodalTextbox(placeholder="Schreib was oder lade Dateien hoch…", file_count="multiple")
     state = gr.State(None)