import { NextResponse } from "next/server";

// Readiness — 503 when the api liveness is unreachable (web's only readiness
// dependency). Unauthenticated by design; no data beyond the check outcome.
// TASK-0009 item 4: web → `apps/web/src/app/health/ready/route.ts`.

const startedAt = Date.now();

export const dynamic = "force-dynamic";

async function checkApiLiveness(): Promise<{ api: boolean }> {
  const base = process.env.API_URL ?? "http://localhost:4000";
  const controller = new AbortController();
  const timer = setTimeout(() => controller.abort(), 1000);
  try {
    const res = await fetch(`${base}/api/v1/health`, {
      method: "GET",
      signal: controller.signal,
      cache: "no-store"
    });
    return { api: res.ok };
  } catch {
    return { api: false };
  } finally {
    clearTimeout(timer);
  }
}

export async function GET() {
  const checks = await checkApiLiveness();
  const ok = checks.api;
  return NextResponse.json(
    {
      status: ok ? "ready" : "not_ready",
      uptimeSeconds: Math.round((Date.now() - startedAt) / 1000),
      checks
    },
    { status: ok ? 200 : 503 }
  );
}