/* smod js/theme.js — ported verbatim from the 1.0 dashboard_core.js:605-651 (entry 010)
 * as its own file because smod's login.html loads no dashboard.js and the module must run
 * in <head> on EVERY page (prevents a wrong-theme first paint). Theme round 2026-08-06. */
/* ============================================================================
 * THEME TOGGLE  (light/dark)  — entry 010, light-theme feature
 * ----------------------------------------------------------------------------
 * Adds/removes the "light-theme" class on the root <html> element. CSS owns all
 * colour (see styles.css :root.light-theme block); this only flips the class
 * and remembers the choice. Default = dark (no class). Exposed as a global so
 * the inline header onclick can reach it, matching this codebase's convention
 * of page-local inline handlers (e.g. toggleSidebar).
 *
 * localStorage is used for persistence. This is real on-device firmware, where
 * localStorage is available; the embedded browser retains it across reloads.
 * ==========================================================================*/
(function () {
    'use strict';
    var KEY = 'aw-theme';            // stored value: 'light' or 'dark'
    var CLASS = 'light-theme';
    var root = document.documentElement;

    function apply(theme) {
        if (theme === 'light') {
            root.classList.add(CLASS);
        } else {
            root.classList.remove(CLASS);
        }
    }

    // Apply the saved choice as early as possible to avoid a flash of the
    // wrong theme. dashboard_core.js is loaded in <head>, so this runs before
    // the body paints on most pages.
    try {
        var saved = window.localStorage ? localStorage.getItem(KEY) : null;
        apply(saved === 'light' ? 'light' : 'dark');   // default dark
    } catch (e) {
        apply('dark');
    }

    // Global handler for the header toggle button's onclick.
    window.toggleTheme = function () {
        var nowLight = root.classList.toggle(CLASS);
        try {
            if (window.localStorage) {
                localStorage.setItem(KEY, nowLight ? 'light' : 'dark');
            }
        } catch (e) { /* storage unavailable; theme still applies for this session */ }
    };
})();