/**
 * Net amount of a single document line after its per-item percentage discount
 * ("Sleva"). `net = qty × unit_price × (1 − discount/100)`.
 *
 * The discount is tolerant of null/undefined/NaN (a missing discount = none)
 * and clamped to 0–100 so a stray value can never make the net negative.
 * Single source of truth for offers + invoices (totals, VAT base, PDFs).
 */
export function lineNet(
  qty: number,
  unitPrice: number,
  discountPct: number | null | undefined,
): number {
  const pct = Number(discountPct);
  const safePct = Number.isFinite(pct) ? Math.min(100, Math.max(0, pct)) : 0;
  return qty * unitPrice * (1 - safePct / 100);
}