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

type Membership = 'gold' | 'silver';

const GOLD_BIG_DISCOUNT = 0.20;
const GOLD_SMALL_DISCOUNT = 0.10;

const SILVER_BIG_DISCOUNT = 0.10;
const SILVER_SMALL_DISCOUNT = 0.05;

const BIG_ORDER = 100;



function calculateTotal(items: OrderItem[]) {
  return items.reduce((prev, curr) => (curr.price * curr.quantity) + prev , 0)
}

function calculateDiscount(membership: Membership, total: number) {
  
  if( membership === 'gold') {
    if ( total >= BIG_ORDER ) return total * GOLD_BIG_DISCOUNT

    return total * GOLD_SMALL_DISCOUNT;
  }
  
  if ( membership === 'silver') {
    if (  total >= BIG_ORDER ) return total * SILVER_BIG_DISCOUNT;
    return total * SILVER_SMALL_DISCOUNT;
  }

  return 0;
}

export function calculateOrderDiscount(items: OrderItem[], membership: Membership): number {
  const total = calculateTotal(items)

  // Verificar si el pedido cumple el mínimo requerido
  if (total < 10) return -1;

  const discount = calculateDiscount(membership, total)


  return total - discount;
}