import { readFileSync } from "node:fs";
import path from "node:path";

import { APP_VERSION } from "@/lib/version";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

/**
 * Deploy health check: reports which release is running. The deploy script
 * writes `release.json` next to the server (in the standalone root) and polls
 * this route after switching `current`; a mismatch or an unreachable server
 * triggers the automatic rollback.
 *
 * In a dev checkout there is no release.json — the route answers with the
 * commit baked into the environment, or "dev".
 */
export async function GET() {
  let release: { commit?: string; short?: string; builtAt?: string; release?: string } | null = null;
  try {
    release = JSON.parse(readFileSync(path.join(process.cwd(), "release.json"), "utf8"));
  } catch {
    release = null;
  }

  const commit = release?.commit ?? process.env.FREEZMO_COMMIT ?? "dev";
  return Response.json(
    {
      ok: true,
      version: APP_VERSION,
      commit,
      short: release?.short ?? commit.slice(0, 7),
      builtAt: release?.builtAt ?? null,
      release: release?.release ?? null,
      dev: commit === "dev",
      uptimeSeconds: Math.round(process.uptime()),
    },
    { headers: { "Cache-Control": "no-store" } },
  );
}