interface OrderItem {
  price: number;
  quantity: number;
}

const PERCENT_20 = 0.20
const PERCENT_10 = 0.10
const PERCENT_05 = 0.05

const MIN_COST_REQUIRED = 10
const TOP_LIMIT = 100

const MEMBERSHIP_GOLD = "gold"
const MEMBERSHIP_SILVER = "silver"


function applyDiscount(membership: string, total: number) {

  if (membership === MEMBERSHIP_GOLD) {
    // Pedidos grandes reciben mayor descuento
    if (total >= TOP_LIMIT) {
      return total * PERCENT_20;
    }

    return total * PERCENT_10;
  }

  if (membership === MEMBERSHIP_SILVER) {
    // Pedidos grandes reciben mayor descuento
    if (total >= TOP_LIMIT) {
      return total * PERCENT_10;
    }

    return total * PERCENT_05;
  }

  return 0;
}

function calculateTotal(orders: OrderItem[]) {
  let total = 0;

  for (let idxOrder = 0; idxOrder < orders.length; idxOrder++) {
    total = total + orders[idxOrder].price * orders[idxOrder].quantity;
  }

  return total
}

export function calculateOrderDiscount(orders: OrderItem[], membership: string): number {

  let total = calculateTotal(orders);
  // Verificar si el pedido cumple el mínimo requerido
  if (total < MIN_COST_REQUIRED) return -1;

  // Calcula el descuento
  const discount = applyDiscount(membership, total)


  return total - discount;
}