attempt 3 to fix UI visbility issue

app.py

@@ -24,12 +24,12 @@ class PDFChatbot:
     def process_pdf(self, pdf_file):
         try:
             if self.state.is_db_ready():
-                return gr.update(interactive=False)
+                return
 
             file_size_mb = os.path.getsize(pdf_file.name) / (1024 * 1024)
             if file_size_mb >= 75:
                 gr.Error("File size exceeds the 75 MB limit. Please upload a smaller PDF.")
-                return gr.update(interactive=True)
+                return
 
             self.state = SessionState()
             doc = fitz.open(pdf_file.name)
@@ -49,12 +49,10 @@ class PDFChatbot:
             )
 
             gr.Info("PDF processed successfully! You can now ask questions about the document.")
-            return gr.update(interactive=False)
         except Exception as e:
             if os.path.exists(self.state.vector_store_path):
                 shutil.rmtree(self.state.vector_store_path)
             gr.Error(f"An error occurred: {str(e)}")
-            return gr.update(interactive=True)
 
     def chat_with_pdf(self, message, history):
         if not self.state.is_db_ready():
@@ -126,20 +124,14 @@ with gr.Blocks(title="PDF Chatbot") as demo:
         visible=False
     )
 
-    def show_chat_interface(show):
-        return gr.update(visible=True)
+    def process_and_show_chat(file):
+        chatbot.process_pdf(file)
+        return gr.update(visible=True), gr.update(interactive=False)
 
     file_upload_input.upload(
-        fn=chatbot.process_pdf,
+        fn=process_and_show_chat,
         inputs=[file_upload_input],
-        outputs=[file_upload_input]
-    )
-
-    file_upload_input.upload(
-        fn=show_chat_interface,
-        inputs=[gr.Number(value=1, visible=False)],
-        outputs=[chat_interface],
-        preprocess=False
+        outputs=[chat_interface, file_upload_input]
     )
 
 demo.launch()