# dashboard/callbacks/settings_callbacks.py
import dash
from dash import Input, Output, State, dcc
from flask import session
from utils.db import execute_query, execute_non_query

@dash.callback(
    Output("settings-feedback", "children"),
    Input("btn-save-settings", "n_clicks"),
    State("input-default-volume", "value"),
    prevent_initial_call=True
)
def save_settings(n_clicks, volume):
    if "role" not in session:
        return dcc.Location(href="/login")
    if n_clicks and n_clicks > 0:
        sql = "UPDATE global_settings SET value=%s WHERE key='default_volume'"
        rc = execute_non_query(sql, (volume,))
        return "Einstellungen gespeichert." if rc else "Speichern fehlgeschlagen."
    return ""