windwiderstand/src/hooks.server.ts

import { getTranslationBundleBySlug } from '$lib/cms';
import { TRANSLATION_BUNDLE_SLUG } from '$lib/constants';
import type { Handle } from '@sveltejs/kit';

/**
 * Page-Routen: kurze Edge-Cache + SWR. Webhook purged App-Cache,
 * Edge läuft via stale-while-revalidate auf den warmen App-Cache.
 */
const PAGE_CACHE_CONTROL =
  'public, max-age=0, s-maxage=30, stale-while-revalidate=300';

function isCacheablePath(pathname: string): boolean {
  if (pathname.startsWith('/api/')) return false;
  if (pathname.startsWith('/cms-images/')) return false;
  if (pathname.startsWith('/_app/')) return false;
  return true;
}

export const handle: Handle = async ({ event, resolve }) => {
  try {
    const bundle = await getTranslationBundleBySlug(TRANSLATION_BUNDLE_SLUG, { locale: 'de' });
    if (bundle?.strings && typeof bundle.strings === 'object') {
      const normalized: Record<string, string> = {};
      for (const [key, val] of Object.entries(bundle.strings)) {
        const v = val as unknown;
        const str =
          typeof v === 'string'
            ? v
            : typeof v === 'object' && v !== null && 'value' in v
              ? (v as { value?: unknown }).value
              : (v as { text?: unknown })?.text ?? (v as { label?: unknown })?.label;
        if (typeof str === 'string') normalized[key] = str;
      }
      event.locals.translations = normalized;
    } else {
      event.locals.translations = {};
    }
  } catch {
    event.locals.translations = {};
  }

  const response = await resolve(event);

  if (
    event.request.method === 'GET' &&
    isCacheablePath(event.url.pathname) &&
    !response.headers.has('cache-control')
  ) {
    response.headers.set('cache-control', PAGE_CACHE_CONTROL);
  }

  return response;
};