// ABOUTME: Next.js instrumentation file for server startup initialization.
// ABOUTME: Schedules cron jobs for notifications and Garmin sync using node-cron.

export async function register() {
  // Only run on the server side
  if (process.env.NEXT_RUNTIME === "nodejs") {
    const cron = await import("node-cron");

    const APP_URL = process.env.APP_URL || "http://localhost:3000";
    const CRON_SECRET = process.env.CRON_SECRET;

    // Log startup
    console.log("[cron] Scheduler starting...");

    if (!CRON_SECRET) {
      console.warn(
        "[cron] CRON_SECRET not set - cron jobs will fail authentication",
      );
    }

    // Helper to call cron endpoints
    async function triggerCronEndpoint(endpoint: string, name: string) {
      try {
        const response = await fetch(`${APP_URL}/api/cron/${endpoint}`, {
          method: "POST",
          headers: {
            Authorization: `Bearer ${CRON_SECRET}`,
            "Content-Type": "application/json",
          },
        });

        if (!response.ok) {
          const errorText = await response.text();
          console.error(
            `[cron] ${name} failed: ${response.status} ${errorText}`,
          );
        } else {
          const result = await response.json();
          console.log(`[cron] ${name} completed:`, result);
        }
      } catch (error) {
        console.error(`[cron] ${name} error:`, error);
      }
    }

    // Schedule notifications at the top of every hour
    cron.default.schedule("0 * * * *", () => {
      console.log("[cron] Triggering notifications...");
      triggerCronEndpoint("notifications", "Notifications");
    });

    // Schedule Garmin sync at 30 minutes past every hour
    cron.default.schedule("30 * * * *", () => {
      console.log("[cron] Triggering Garmin sync...");
      triggerCronEndpoint("garmin-sync", "Garmin sync");
    });

    console.log(
      "[cron] Scheduler started - notifications at :00, Garmin sync at :30",
    );
  }
}