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

const AMOUNT_FOR_LOW_OR_OVER_DISCOUNT = 100; 

const GOLD_MEMBERSHIP_FEW_ITEMS_DISCOUNT = 0.10;
const GOLD_MEMBERSHIP_MORE_ITEMS_DISCOUNT = 0.20;
const SILVER_MEMBERSHIP_FEW_ITEMS_DISCOUNT = 0.05;
const SILVER_MEMBERSHIP_MORE_ITEMS_DISCOUNT = 0.10;

const MEMBERSHIP_TYPE_DISCOUNTPAIR: Record<"gold" | "silver", DiscountPercentagePair > = {
    gold: [GOLD_MEMBERSHIP_FEW_ITEMS_DISCOUNT, GOLD_MEMBERSHIP_MORE_ITEMS_DISCOUNT],
    silver: [SILVER_MEMBERSHIP_FEW_ITEMS_DISCOUNT, SILVER_MEMBERSHIP_MORE_ITEMS_DISCOUNT]
}

// Pedidos grandes reciben mayor descuento
type DiscountPercentagePair = [underControlDiscount:  number, overControlDiscount : number];

export function calculateOrderDiscount(orders: OrderItem[], membershipKey: string): number {
  let totalAmount = 0;
  const MINIMUN_AMOUNT_FOR_DISCOUNT = 10

  // Sumar el total de todos los items del pedido
  for (let orderItem = 0; orderItem < orders.length; orderItem++) {
    totalAmount = totalAmount + orders[orderItem].price * orders[orderItem].quantity;
  }

  // Verificar si el pedido cumple el mínimo requerido
  if (totalAmount < MINIMUN_AMOUNT_FOR_DISCOUNT) return -1;

  let discountAmount = 0;

  
  // Aplicar descuento según el tipo de membresía y el monto total
  if(MEMBERSHIP_TYPE_DISCOUNTPAIR[membershipKey]){
    discountAmount = calculateDiscountAmount(totalAmount, MEMBERSHIP_TYPE_DISCOUNTPAIR[membershipKey])
  }
  return totalAmount - discountAmount;
}

function calculateDiscountAmount(totalAmount: number, discountPercantages: DiscountPercentagePair){
      let discountAmout =  0;
    if(totalAmount >= AMOUNT_FOR_LOW_OR_OVER_DISCOUNT){
      discountAmout = totalAmount * discountPercantages[1];
    }else {
      discountAmout = totalAmount * discountPercantages[0];
    }
    return discountAmout
}