CedarCopilot/cedar-mail

import {
  appUrl,
  hasSplitHosts,
  isAppHost,
  isMarketingHost,
  isMarketingPath,
  leaveForOrigin,
  marketingUrl,
} from '@/lib/marketing-host';
import { useLocation } from 'react-router';
import { useEffect } from 'react';

/**
 * Keeps each origin to its own half of the site once the marketing site and the app
 * have separate hostnames (see lib/marketing-host.ts).
 *
 * Marketing paths that land on the app host — typically old inbound links and stale
 * search results for mail.cedarcopilot.com/pricing — move to the marketing origin, and
 * app paths that land on the marketing host move to the app origin (where the session
 * cookie lives, so the user stays signed in).
 *
 * Crossing origins is a full-page navigation — see leaveForOrigin.
 *
 * No-ops entirely until VITE_PUBLIC_MARKETING_URL names a host distinct from the app's.
 */
export function useHostRouting() {
  const location = useLocation();

  useEffect(() => {
    if (!hasSplitHosts()) return;

    const path = `${location.pathname}${location.search}${location.hash}`;
    const marketing = isMarketingPath(location.pathname);

    if (isAppHost() && marketing) {
      const target = marketingUrl(path);
      if (target) leaveForOrigin(target);
      return;
    }

    if (isMarketingHost() && !marketing) {
      const target = appUrl(path);
      if (target) leaveForOrigin(target);
    }
  }, [location.pathname, location.search, location.hash]);
}