"use client";

import { useCallback } from "react";
import { createCheckoutService } from "@/lib/services/checkoutService";

interface UseShippingMethodSelectorOptions {
  checkoutId: string | null;
  onSelect: (methodId: string) => void;
  onRefresh: () => Promise<void>;
}

interface UseShippingMethodSelectorResult {
  selectShippingMethod: (methodId: string) => Promise<void>;
  selectShippingMethodWithApi: (methodId: string) => Promise<void>;
}

/**
 * Hook to manage shipping method selection
 * Encapsulates both UI state update and API communication
 * Used for both manual selection (user click) and auto-selection (default method)
 */
export function useShippingMethodSelector(
  options: UseShippingMethodSelectorOptions
): UseShippingMethodSelectorResult {
  const { checkoutId, onSelect, onRefresh } = options;

  /**
   * Updates UI state only (for initial/pre-selection)
   */
  const selectShippingMethod = useCallback(
    async (methodId: string) => {
      onSelect(methodId);
    },
    [onSelect]
  );

  /**
   * Updates UI state AND calls Saleor API
   * Use this when user manually selects OR when auto-selecting the default
   */
  const selectShippingMethodWithApi = useCallback(
    async (methodId: string) => {
      if (!checkoutId) {
        console.warn("[selectShippingMethodWithApi] No checkoutId provided");
        return;
      }

      // Update UI immediately for responsiveness
      onSelect(methodId);

      // Call API through CheckoutService
      const checkoutService = createCheckoutService(checkoutId);
      const result = await checkoutService.updateShippingMethod(methodId);

      if (result.success) {
        // Refresh checkout to get updated totals including shipping
        await onRefresh();
      } else {
        console.error(
          "[selectShippingMethodWithApi] Failed to update shipping method:",
          result.error
        );
        // Could add error handling/rollback here
      }
    },
    [checkoutId, onSelect, onRefresh]
  );

  return {
    selectShippingMethod,
    selectShippingMethodWithApi,
  };
}