/**
 * Points at the instance an account from another gerbeur comes from, its
 * home, where its password, email, avatar and name are changed. Such a user's
 * handle here is `name@host` (`splitHandle`); the profile, the settings and
 * the `/authorize` page read it through these.
 *
 * @module
 */

import { splitHandle } from "../../../shared/validation.ts";
import { userPath } from "../../../shared/paths.ts";

/**
 * Returns the host of `handle`'s home instance, or undefined for a local
 * user.
 */
export function homeHost(handle: string): string | undefined {
  return splitHandle(handle).host;
}

/**
 * Returns the URL of `path` on `handle`'s home instance, their profile there
 * by default, or null for a local user. Instances speak the same protocol as
 * this page, https outside development.
 */
export function homeUrl(handle: string, path?: string): string | null {
  const { name, host } = splitHandle(handle);
  if (!host) return null;
  return `${globalThis.location.protocol}//${host}${path ?? userPath(name)}`;
}