Presupuestador_web/client/src/lib/calc.ts

import { MoneyValue, Percentage, Quantity } from "@shared/contexts";
import { IMoney, IPercentage, IQuantity } from "./types";

export const calculateItemTotals = (item: {
  quantity?: IQuantity;
  unit_price?: IMoney;
  discount?: IPercentage;
}): {
  quantity: Quantity;
  unitPrice: MoneyValue;
  subtotalPrice: MoneyValue;
  discount: Percentage;
  totalPrice: MoneyValue;
} | null => {
  console.log(item);

  const { quantity: quantity_dto, unit_price: unit_price_dto, discount: discount_dto } = item;

  if (quantity_dto === "" || unit_price_dto === "") {
    return null;
  }

  const quantityOrError = Quantity.create(quantity_dto);
  if (quantityOrError.isFailure) {
    throw quantityOrError.error;
  }
  const quantity = quantityOrError.object;

  const unitPriceOrError = MoneyValue.create(unit_price_dto);
  if (unitPriceOrError.isFailure) {
    throw unitPriceOrError.error;
  }
  const unitPrice = unitPriceOrError.object;

  const discountOrError = Percentage.create(discount_dto);
  if (discountOrError.isFailure) {
    throw discountOrError.error;
  }
  const discount = discountOrError.object;

  const subtotalPrice = unitPrice.multiply(quantity.toNumber());
  const totalPrice = subtotalPrice.subtract(subtotalPrice.percentage(discount.toNumber()));

  return {
    quantity,
    unitPrice,
    subtotalPrice,
    discount,
    totalPrice,
  };
};