Update app.py

app.py

@@ -61,14 +61,46 @@ app.layout = dbc.Container([
 ], fluid=True)
 
 @callback(
+    Output('pdf-name', 'children'),
     Output('split-button', 'disabled'),
-    Input('upload-pdf', 'contents')
+    Input('upload-pdf', 'contents'),
+    Input('upload-pdf', 'filename')
 )
-def enable_split_button(contents):
-    if contents:
-        logger.info("PDF uploaded, enabling Split PDF button")
-        return False
-    return True
+def update_output(contents, filename):
+    if contents is not None:
+        logger.info(f"PDF uploaded: {filename}")
+        return html.Div(f"Uploaded: {filename}"), False
+    return "", True
+
+@callback(
+    Output('ranges-container', 'children'),
+    Input('add-range', 'n_clicks'),
+    State('ranges-container', 'children'),
+    prevent_initial_call=True
+)
+def add_range(n_clicks, existing_ranges):
+    if n_clicks:
+        new_index = len(existing_ranges)
+        new_range = dbc.Row([
+            dbc.Col(dbc.Input(id={'type': 'range-input', 'index': new_index}, type='text', placeholder='Enter page range (e.g., 1-3)'), width=10),
+            dbc.Col(dbc.Button("Remove", id={'type': 'remove-range', 'index': new_index}, color="danger", size="sm"), width=2),
+        ], className="mb-2")
+        existing_ranges.append(new_range)
+    return existing_ranges
+
+@callback(
+    Output('ranges-container', 'children', allow_duplicate=True),
+    Input({'type': 'remove-range', 'index': ALL}, 'n_clicks'),
+    State('ranges-container', 'children'),
+    prevent_initial_call=True
+)
+def remove_range(n_clicks, existing_ranges):
+    ctx = dash.callback_context
+    if not ctx.triggered:
+        raise PreventUpdate
+    button_id = ctx.triggered[0]['prop_id'].split('.')[0]
+    index_to_remove = json.loads(button_id)['index']
+    return [range for i, range in enumerate(existing_ranges) if i != index_to_remove]
 
 @callback(
     Output('progress-bar', 'value'),