<?php
/** api#326: новый шум при каждой навигации; recovery хранит выбранные цифры. */
return <<<'JS'
(function () {
    const keys = ['indpic','theme','degr','reg','banch','tp','cons','focus','part'];
    const enums = {theme:{dark:'1',light:'2'},reg:{before:'1',after:'2'},banch:{b:'1',a:'2'},focus:{face:'1',center:'2'},part:{'1':'1','2':'2'}};
    const legacy = {reg:'registration',banch:'bchoice'};
    const valid = (key, value) => /^[1-9]$/.test(value || '') && (!enums[key] || Object.values(enums[key]).includes(value));
    function restore(meta, defaults) {
        const query = new URLSearchParams(meta.redirectUtm || '');
        const digits = {};
        for (const key of keys) {
            let value = meta.utmDigits?.[key] ?? (key === 'banch' ? meta.utmDigits?.chob : undefined);
            if (!valid(key, value)) {
                // Только сохранённый record: старые enum/открытые цифры не являются raw URL alias.
                const stored = query.get(legacy[key] || key) ?? query.get(key) ?? (key === 'banch' ? query.get('chob') : null);
                value = enums[key]?.[stored] || stored;
                if (!valid(key, value)) value = Array.from(stored || '')[4];
            }
            digits[key] = valid(key, value) ? value : defaults[key];
        }
        return digits;
    }
    const alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    function mask(digit) {
        const bytes = new Uint8Array(10);
        crypto.getRandomValues(bytes);
        const chars = Array.from(bytes, value => alphabet[value % alphabet.length]);
        chars[4] = digit;
        return chars.join('');
    }
    function query(meta, defaults) {
        const params = new URLSearchParams(meta.redirectUtm || '');
        const digits = restore(meta, defaults);
        for (const key of ['registration','bchoice','chob','chb','key','shown_theme',...keys]) params.delete(key);
        for (const key of keys) params.set(key, mask(digits[key]));
        return params.toString();
    }
    window.ZoomzillaUtmHandoff = {restore, query};
})();
JS;