function initSorter() {
    const listContainer = document.querySelector('.s-res-list');
    const sortRadios = document.querySelectorAll('.sort-radio');

    // wenn keine liste vorhanden, abbrechen
    if (!listContainer || sortRadios.length === 0) return;

    sortRadios.forEach(radio => {
        radio.addEventListener('change', function() {
            const cards = Array.from(listContainer.querySelectorAll('.s-res-item'));
            const sortValue = this.value;

            cards.sort((a, b) => {
                if (sortValue === 'likes') {
                    const likesA = parseInt(a.getAttribute('data-likes') || '0', 10);
                    const likesB = parseInt(b.getAttribute('data-likes') || '0', 10);
                    return likesB - likesA; 
                }
                else if (sortValue === 'alphabet') {
                    // alphabetische sortierung
                    const titleA = a.querySelector('.s-res-link').textContent.trim().toLowerCase();
                    const titleB = b.querySelector('.s-res-link').textContent.trim().toLowerCase();
                    return titleA.localeCompare(titleB);
                } 
                else if (sortValue === 'newest' || sortValue === 'oldest') {
                    // hoehere ID wird als neuer gesehen
                    const urlA = a.querySelector('.s-res-link').getAttribute('href');
                    const urlB = b.querySelector('.s-res-link').getAttribute('href');
                    
                    const idA = parseInt(urlA.match(/id=(\d+)/)[1], 10);
                    const idB = parseInt(urlB.match(/id=(\d+)/)[1], 10);

                    return sortValue === 'newest' ? idB - idA : idA - idB;
                }
                return 0;
            });

            listContainer.innerHTML = '';
            cards.forEach(card => listContainer.appendChild(card));
        });
    });
}

// ist das DOM bereits vollständig aufgebaut?
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', initSorter);
} else {
    initSorter();
}