/**
 * Next.js instrumentation hook — runs once per server process.
 * Schedules the model registry refresh (startup + interval) using the owner keys from the
 * environment. Users additionally trigger syncs with their own keys when they add a provider.
 */
export async function register() {
  if (process.env.NEXT_RUNTIME !== "nodejs") return;
  if (process.env.POLYLLM_DISABLE_SCHEDULER === "1") return;
  const { syncAllWithEnvKeys } = await import("@/lib/ai/registry");
  const { log } = await import("@/lib/log");
  const minutes = Number(process.env.MODEL_SYNC_INTERVAL_MINUTES ?? 360);

  const run = async (why: string) => {
    try {
      const results = await syncAllWithEnvKeys(why);
      log.info("scheduled model sync", { why, results: results.map((r) => ({ provider: r.provider, ok: r.ok, found: r.found, added: r.added, removed: r.removed })) });
    } catch (e) {
      log.warn("scheduled model sync failed", { error: (e as Error).message });
    }
  };

  // Startup sync (delayed so the DB pool and migrations are ready).
  setTimeout(() => void run("startup"), 5_000).unref?.();
  if (minutes > 0) setInterval(() => void run("schedule"), minutes * 60_000).unref?.();
}