/**
 * Next.js Instrumentation Hook
 *
 * https://nextjs.org/docs/app/building-your-application/optimizing/instrumentation
 *
 * This file is automatically loaded by Next.js when the server starts.
 * We use it to boot the EVE auto-sync cron job in the Node.js runtime.
 *
 * IMPORTANT: We only run on the server (Node.js runtime), not on the
 * Edge runtime — node-cron requires Node.js APIs.
 */

export async function register() {
  // Only boot in the Node.js runtime — not Edge, not Workers
  if (process.env.NEXT_RUNTIME !== "nodejs") {
    return;
  }

  // Skip during builds (Next.js runs instrumentation during `next build` too)
  if (process.env.NEXT_PHASE === "phase-production-build") {
    return;
  }

  console.log("[instrumentation] Booting EVE auto-sync cron...");

  // Dynamic import keeps node-cron out of the Edge bundle
  const { startAutoSyncCron } = await import("@/lib/eve/cron");

  // Default: tick every minute. Override with EVE_SYNC_CRON env var.
  // Examples:
  //   "* * * * *"     — every minute (default)
  //   "*/30 * * * * *" — every 30 seconds (uses 6-field syntax)
  //   "*/5 * * * *"   — every 5 minutes
  const schedule = process.env.EVE_SYNC_CRON || "* * * * *";
  startAutoSyncCron(schedule);
}