/**
 * Copyright (c) Facebook, Inc. And its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import type { ThemeConfigAlgolia } from '@docsearch/docusaurus-adapter';
import { isRegexpStringMatch } from '@docusaurus/theme-common';
import { useBaseUrlUtils } from '@docusaurus/useBaseUrl';
import { useCallback } from 'react';

import { useAlgoliaThemeConfig } from './useAlgoliaThemeConfig';

function replacePathname(
  pathname: string,
  replaceSearchResultPathname: ThemeConfigAlgolia['replaceSearchResultPathname'],
): string {
  return replaceSearchResultPathname
    ? pathname.replaceAll(new RegExp(replaceSearchResultPathname.from, 'g'), replaceSearchResultPathname.to)
    : pathname;
}

/**
 * Process the search result url from Algolia to its final form, ready to be
 * navigated to or used as a link.
 */
export function useSearchResultUrlProcessor(): (url: string) => string {
  const { withBaseUrl } = useBaseUrlUtils();
  const { externalUrlRegex, replaceSearchResultPathname } = useAlgoliaThemeConfig();

  return useCallback(
    (url: string) => {
      const parsedURL = new URL(url);

      // Algolia contains an external domain => navigate to URL
      if (isRegexpStringMatch(externalUrlRegex, parsedURL.href)) {
        return url;
      }

      // Otherwise => transform to relative URL for SPA navigation
      const relativeUrl = `${parsedURL.pathname}${parsedURL.search}${parsedURL.hash}`;

      return withBaseUrl(replacePathname(relativeUrl, replaceSearchResultPathname));
    },
    [withBaseUrl, externalUrlRegex, replaceSearchResultPathname],
  );
}