import clsx, { ClassValue } from 'clsx';
import { ReadonlyURLSearchParams } from 'next/navigation';
import { twMerge } from 'tailwind-merge';

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 function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

export function normalizeUrl(domain: string, url: string) {
  return url.replace(domain, '').replace('/collections', '/search').replace('/pages', '');
}

export const parseMetaFieldValue = <T>(field: { value: string } | null): T | null => {
  try {
    return JSON.parse(field?.value || '{}');
  } catch (error) {
    return null;
  }
};