/**
 * Helpers for interpreting ParkSmarter parking estimates.
 *
 * Pulled out as pure functions so the "is this a free window?" decision is
 * testable without the app, the network, or React Native. The BigBrainParking
 * app's single-estimate fallback uses these to avoid showing a bogus "$0.00"
 * purchase ladder during free windows.
 */

/**
 * A free window: the single estimate reports no purchasable time. Live captures
 * show free zones return `MaxTime: 0` (and `$0.00`), while paid zones return a
 * positive MaxTime. Anything <= 0 (or non-numeric) counts as free.
 */
export function isFreeEstimate(probe: { MaxTime?: number | string | null } | null | undefined): boolean {
  return (Number(probe?.MaxTime) || 0) <= 0;
}

/** Every rung of a built ladder is $0.00 — effectively a free window too. */
export function ladderAllFree(
  rungs: ReadonlyArray<{ ParkingCost?: number | string | null }>,
): boolean {
  return rungs.length > 0 && rungs.every((r) => (Number(r?.ParkingCost) || 0) === 0);
}