const settingsCache = new Map<string, { etag: string; data: unknown }>();

export async function fetchCanvasSiteSettings(url: string) {
  const cached = settingsCache.get(url);
  const controller = new AbortController();
  const timeoutId = setTimeout(
    () => controller.abort(),
    url === "/api/site-settings?scope=agent-canvas" ? 30_000 : 10_000
  );
  try {
    const response = await fetch(url, {
      headers: cached ? { "If-None-Match": cached.etag } : undefined,
      signal: controller.signal,
    });
    if (response.status === 304 && cached) return cached.data;
    if (!response.ok) throw new Error("Failed to fetch canvas site settings");
    const data = await response.json();
    const etag = response.headers.get("ETag");
    if (etag) settingsCache.set(url, { etag, data });
    return data;
  } finally {
    clearTimeout(timeoutId);
  }
}