// src/run.js
// @ts-check

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

/**
 * @param {RunInput} input
 * @returns {FunctionRunResult}
 */
export function run(input) {
  const targets = input.cart.lines
    .filter(line => line.merchandise.product.hasAnyTag)
    .map(line => ({
      cartLine: {
        id: line.id
      }
    }));

  if (!targets.length) {
    return {
      discounts: [],
      discountApplicationStrategy: "FIRST",
    };
  }

  return {
    discounts: [
      {
        targets,
        value: {
          percentage: {
            value: "10.0"
          }
        },
        message: "VIP Discount"
      }
    ],
    discountApplicationStrategy: "FIRST",
  };
}