/**
 * Finds the highest quantity that can be sold of an item adjusted to its `multipleQuantity`
 * @param stock item stock
 * @param maxQuantity maximum quantity of this item that can be added
 * @param multipleQuantity `multipleQuantity` for the item
 * @returns the highest quantity of the item that can be sold
 */
export const getMaximumValue = (
  stock: number,
  maxQuantity: number,
  multipleQuantity: number
): number => {
  const maxValue = Math.min(stock, maxQuantity);
  const maxQuantityTimes = Math.floor(maxValue / multipleQuantity) ?? 1;
  const maxStockMultipleQuantity = maxQuantityTimes * multipleQuantity;
  return maxStockMultipleQuantity;
};
/**
 * Find the `multipleQuantity` closest to `quantity`
 * @param quantity amount you want to add
 * @param multipleQuantity multipleQuantity of this item
 * @param stock item stock
 * @returns quantity that complies with the `multiple Quantity`
 */
export const roundToMultipleQuantity = (
  quantity: number,
  multipleQuantity: number,
  stock: number
) => {
  const roundNumber =
    Math.round(quantity / multipleQuantity) * multipleQuantity;
  const roundStock = Math.floor(stock / multipleQuantity) * multipleQuantity;
  return stock < roundNumber ? roundStock : roundNumber;
};

export const getDiscount = (regularPrice: number, discountedPrice: number) =>
  ((regularPrice - discountedPrice) / regularPrice) * 100;