webtools/site/countdown/settings.mjs

import { integer } from './timer.mjs';

export const SETTINGS_KEY = 'countdown-settings';

export function serializeSettings(minutes, seconds) {
    return JSON.stringify({
        minutes: String(integer(minutes)),
        seconds: String(integer(seconds)),
    });
}

export function parseSettings(json) {
    try {
        const settings = JSON.parse(json);
        if (typeof settings?.minutes === 'string' && /^\d+$/.test(settings.minutes) &&
            typeof settings?.seconds === 'string' && /^\d+$/.test(settings.seconds)) {
            return {
                minutes: String(integer(settings.minutes)),
                seconds: String(integer(settings.seconds)).padStart(2, '0'),
            };
        }
    } catch {
        // Missing or invalid storage is equivalent to a fresh countdown.
    }
    return { minutes: '0', seconds: '00' };
}