// Shared pure helpers and constants used across modules.

// Allowed range for the "moderators per day" setting.
export const MIN_MODERATORS_PER_DAY = 1;
export const MAX_MODERATORS_PER_DAY = 5;


// "YYYY-MM-DD" from numeric parts.
export function toISO(year, month, day) {
  return year + '-' + String(month).padStart(2, '0') + '-' + String(day).padStart(2, '0');
}

// "YYYY-MM" month prefix (used to filter history by month).
export function monthPrefix(year, month) {
  return year + '-' + String(month).padStart(2, '0');
}

// Weekday for an ISO date string: 1=Mo, 2=Di, 3=Mi, 4=Do, 5=Fr, 6=Sa, 7=So.
export function getWeekday(isoDate) {
  const d = new Date(isoDate + 'T12:00:00Z').getUTCDay(); // 0=Sun
  return d === 0 ? 7 : d;
}

// "DD.MM.YYYY" from an ISO date string.
export function formatDateDE(isoDate) {
  const [y, m, d] = isoDate.split('-');
  return d + '.' + m + '.' + y;
}

// { [id]: name } lookup map from an employees array.
export function buildNameMap(employees) {
  return Object.fromEntries(employees.map(e => [e.id, e.name]));
}