/**
 * Sticky-header helpers (MSEP-11). Pure logic kept separate from the DOM
 * wiring in CalendarManager so it is unit-testable.
 */

/** WP admin bar offset: 32px desktop, 46px on small screens, 0 when absent. */
export function adminBarOffset(hasAdminBar: boolean, viewportWidth: number): number {
  if (!hasAdminBar) {
    return 0;
  }
  return viewportWidth > 782 ? 32 : 46;
}

/**
 * The header sticks while the wrapper's top has scrolled past the viewport
 * top (minus the admin-bar offset) AND enough of the wrapper is still
 * visible that a stuck header doesn't cover the last rows pointlessly.
 */
export function shouldStickHeader(
  wrapperTop: number,
  wrapperBottom: number,
  headerHeight: number,
  offset: number
): boolean {
  return wrapperTop < offset && wrapperBottom > offset + headerHeight + 60;
}