import { ReadonlyURLSearchParams } from 'next/navigation';

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.\n\n${missingEnvironmentVariables.join('\n')}\n`);
  }
}