// @ts-check
import { renameLabelFor } from "./evaluate.js";

/**
 * @typedef {import("../generated/api").CartInput} RunInput
 * @typedef {import("../generated/api").FunctionRunResult} FunctionRunResult
 */

/**
 * Delivery Customization Function: relabels every presented delivery
 * option to the shopper's actual chosen method + date, so checkout never
 * shows a generic carrier label ("Standard", "Economy") that could be
 * mistaken for a shipping ETA on what's actually a pickup or local-delivery
 * order. Phase 4 doesn't yet have a per-option method mapping (that needs
 * Phase 5's zones/rates work), so every option in the cart gets the same
 * clarified label — reasonable since a single order only has one chosen
 * fulfillment method today.
 * @param {RunInput} input
 * @returns {FunctionRunResult}
 */
export function deliveryCustomizationRun(input) {
  const attributes = {
    dd_method: input.cart.ddMethod?.value,
    dd_date: input.cart.ddDate?.value,
  };

  const decision = renameLabelFor(attributes);
  if (!decision.rename) {
    return { operations: [] };
  }

  const operations = input.cart.deliveryGroups.flatMap((group) =>
    group.deliveryOptions.map((option) => ({
      rename: {
        deliveryOptionHandle: option.handle,
        title: decision.title,
      },
    })),
  );

  return { operations };
}