export function formatDate(isoString) {
    const d = new Date(isoString);
    return d.toLocaleDateString('ru-RU') + ' ' +
           d.toLocaleTimeString('ru-RU', { hour: '2-digit', minute: '2-digit' });
}

export function formatShortDate(isoString) {
    return new Date(isoString).toLocaleDateString('ru-RU', { day: '2-digit', month: '2-digit' });
}

export function formatSet(set) {
    if (set.isDropset && set.subSets) {
        return set.subSets.map(s => `${s.weight}×${s.reps}`).join('-');
    }
    return `${set.weight}×${set.reps}`;
}

export function escapeHtml(str) {
    const div = document.createElement('div');
    div.textContent = str;
    return div.innerHTML;
}

export function toDatetimeLocal(isoString) {
    const d = new Date(isoString);
    const pad = n => String(n).padStart(2, '0');
    return `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())}T${pad(d.getHours())}:${pad(d.getMinutes())}`;
}