export type MemoryCollectionEffect = {
  count: number;
  permil: number;
};

export function memoryParameterPermil(
  count: number,
  effects: readonly MemoryCollectionEffect[]
): number {
  const owned = Math.max(0, Math.floor(Number.isFinite(count) ? count : 0));
  return effects.reduce(
    (rate, effect) => effect.count <= owned && effect.permil > rate ? effect.permil : rate,
    0
  );
}