type TypeProducts = 'electronics' | 'clothing' | 'food'

const VALUE_ZERO = 0
const PERCENT_TAX = 1.21

const ELECTRONIC_DISCOUNT = 0.15
const CLOTHING_DISCOUNT = 0.20
const FOOD_DISCOUNT = 0.05


function calcDiscount(price: number, category: TypeProducts) {

  const mapDiscount = {
    electronics: price * ELECTRONIC_DISCOUNT,
    clothing: price * CLOTHING_DISCOUNT,
    food: price * FOOD_DISCOUNT,
  }
  
  return mapDiscount[category] ?? 0
}


export function getProductFinalPrice(price: number, category: TypeProducts, stock: number): number {
  // Verificar si el stock es válido
  if (stock <= VALUE_ZERO) return -1;

  // Verificar si el precio es válido
  if (price <= VALUE_ZERO) return -1;

  let discount = calcDiscount(price, category);
  // Calcular el precio con descuento aplicado
  let discounted = price - discount;

  // Aplicar el impuesto sobre el precio con descuento
  let result = discounted * PERCENT_TAX;

  // Redondear a dos decimales
  return Math.round(result * 100) / 100;
}