/**
 * Shipping configuration
 * Centralized configuration for shipping rules and thresholds
 */

/**
 * Free shipping threshold in RSD (Serbian Dinar)
 * Orders above this amount qualify for free shipping
 */
export const FREE_SHIPPING_THRESHOLD_RSD = 10000;

/**
 * Default shipping cost in RSD when order is below threshold
 */
export const DEFAULT_SHIPPING_COST_RSD = 500;

/**
 * Currency code for shipping calculations
 */
export const SHIPPING_CURRENCY = "RSD";

/**
 * Check if an order qualifies for free shipping
 * @param orderTotal - The total amount of the order
 * @returns boolean indicating if order qualifies for free shipping
 */
export function qualifiesForFreeShipping(orderTotal: number): boolean {
  return orderTotal >= FREE_SHIPPING_THRESHOLD_RSD;
}

/**
 * Calculate shipping cost based on order total
 * @param orderTotal - The total amount of the order
 * @returns Shipping cost (0 if qualifies for free shipping)
 */
export function calculateShippingCost(orderTotal: number): number {
  return qualifiesForFreeShipping(orderTotal) ? 0 : DEFAULT_SHIPPING_COST_RSD;
}

/**
 * Get the remaining amount needed for free shipping
 * @param orderTotal - The current order total
 * @returns Amount needed to reach free shipping threshold (0 if already qualified)
 */
export function getRemainingForFreeShipping(orderTotal: number): number {
  if (qualifiesForFreeShipping(orderTotal)) {
    return 0;
  }
  return FREE_SHIPPING_THRESHOLD_RSD - orderTotal;
}