import type { RequestHandler } from './$types';
import { json, error } from '@sveltejs/kit';
import { env } from '$env/dynamic/private';
import { env as envPublic } from '$env/dynamic/public';
import { invalidateAll } from '$lib/cms';
import { clearImageCache } from '$lib/image-cache.server';

/**
 * Manual full-cache purge:
 *   - SvelteKit-side TTL cache (cms.ts)
 *   - SvelteKit image cache (memory + disk)
 *   - Optionally: forwards POST to RustyCMS /api/transform/cache/invalidate
 *     when an API key is configured (RUSTYCMS_API_KEY env).
 *
 * Auth: same `REVALIDATE_TOKEN` as /api/revalidate.
 */
export const POST: RequestHandler = async ({ request, url }) => {
  const token = env.REVALIDATE_TOKEN;
  if (!token) throw error(500, 'REVALIDATE_TOKEN not configured');
  const provided =
    request.headers.get('x-revalidate-token') ??
    request.headers.get('x-webhook-secret') ??
    url.searchParams.get('token');
  if (provided !== token) throw error(401, 'invalid token');

  invalidateAll();
  const img = await clearImageCache();

  let cms: unknown = 'skipped';
  const apiKey = env.RUSTYCMS_API_KEY;
  const cmsUrl = (envPublic.PUBLIC_CMS_URL || '').replace(/\/$/, '');
  if (apiKey && cmsUrl) {
    try {
      const res = await fetch(`${cmsUrl}/api/transform/cache/invalidate`, {
        method: 'POST',
        headers: { authorization: `Bearer ${apiKey}` },
      });
      cms = res.ok ? await res.json() : { error: res.status };
    } catch (e) {
      cms = { error: e instanceof Error ? e.message : String(e) };
    }
  }

  return json({ ok: true, content_cache: 'cleared', image_cache: img, cms });
};