commerce/lib/utils.ts

import { ReadonlyURLSearchParams } from 'next/navigation';
import { DiscountMetaobject, Field } from './shopify/types';

export const createUrl = (pathname: string, params: URLSearchParams | ReadonlyURLSearchParams) => {
  const paramsString = params.toString();
  const queryString = `${paramsString.length ? '?' : ''}${paramsString}`;

  return `${pathname}${queryString}`;
};

export const ensureStartsWith = (stringToCheck: string, startsWith: string) =>
  stringToCheck.startsWith(startsWith) ? stringToCheck : `${startsWith}${stringToCheck}`;

export const validateEnvironmentVariables = () => {
  const requiredEnvironmentVariables = ['SHOPIFY_STORE_DOMAIN', 'SHOPIFY_STOREFRONT_ACCESS_TOKEN'];
  const missingEnvironmentVariables = [] as string[];

  requiredEnvironmentVariables.forEach((envVar) => {
    if (!process.env[envVar]) {
      missingEnvironmentVariables.push(envVar);
    }
  });

  if (missingEnvironmentVariables.length) {
    throw new Error(
      `The following environment variables are missing. Your site will not work without them. Read more: https://vercel.com/docs/integrations/shopify#configure-environment-variables\n\n${missingEnvironmentVariables.join(
        '\n'
      )}\n`
    );
  }

  if (
    process.env.SHOPIFY_STORE_DOMAIN?.includes('[') ||
    process.env.SHOPIFY_STORE_DOMAIN?.includes(']')
  ) {
    throw new Error(
      'Your `SHOPIFY_STORE_DOMAIN` environment variable includes brackets (ie. `[` and / or `]`). Your site will not work with them there. Please remove them.'
    );
  }
};

export const formatDiscounts = (data: DiscountMetaobject[]) => {
  const formattedData = data.map((item) => {
    const fields = item.fields.reduce(
      (acc, field: Field) => {
        acc[field.key as string] = field.value;
        return acc;
      },
      {} as Record<string, any>
    );

    return {
      name: fields.name,
      code: fields.discount_code,
      discount: {
        amount: parseFloat(fields.amount) / 100,
        minimumSpent: parseFloat(fields.minimum_spent)
      }
    };
  });
  return formattedData;
};