export interface InternalUrl {
  obj_id: string;
  query?: string;
  hash?: string;
}

export const OBJ_ID_PATTERN = /\bobjid:[a-f0-9]{16}\b/g;

const INTERNAL_LINK_URL_PATTERN = new RegExp(
  `${OBJ_ID_PATTERN.source}[^"']*`,
  'g',
);

export function formatInternalLinks(
  htmlString: string,
  format: (url: InternalUrl) => string | null,
): string {
  return htmlString.replace(
    INTERNAL_LINK_URL_PATTERN,
    (internalLinkUrl) =>
      format(parseInternalUrl(internalLinkUrl)) ?? internalLinkUrl,
  );
}

export function formatInternalUrl(internalUrl: InternalUrl): string {
  const search = internalUrl.query ? `?${internalUrl.query}` : '';
  const hash = internalUrl.hash ? `#${internalUrl.hash}` : '';
  return `objid:${internalUrl.obj_id}${search}${hash}`;
}

export function parseInternalUrl(internalLinkUrl: string): InternalUrl {
  const url = new URL(internalLinkUrl);

  return {
    obj_id: internalLinkUrl.slice(6, 22),
    query: url.search.slice(1),
    hash: url.hash.slice(1),
  };
}