// GET /relay/health — public liveness check. No auth, no credit
// accounting. Returns a minimal status object so monitoring + Recap's
// /api/relay/status can verify the relay is reachable.

import express from "express";
import { readFileSync } from "fs";
import path from "path";
import { fileURLToPath } from "url";
import { getConfigSnapshot } from "../config.js";

// Pull the version off server/package.json once at module load — the
// build pipeline bumps that file in lockstep with each StartOS version
// bump, so the health endpoint always reports a meaningful number.
const __dirname = path.dirname(fileURLToPath(import.meta.url));
let VERSION = "unknown";
try {
  const pkg = JSON.parse(
    readFileSync(path.join(__dirname, "..", "package.json"), "utf8")
  );
  VERSION = pkg.version || "unknown";
} catch {
  // Read failure is non-fatal — health still works, just reports
  // "unknown". Build pipeline shouldn't ever ship a missing
  // package.json so this branch is defensive only.
}

export function healthRouter() {
  const router = express.Router();

  router.get("/health", async (_req, res) => {
    const cfg = await getConfigSnapshot();
    res.json({
      ok: true,
      service: "recap-relay",
      version: VERSION,
      backends: {
        gemini: !!cfg.relay_gemini_api_key,
        // Whether the operator-hardware path is wired up at all.
        // Hardware backends are now sourced from Spark Control
        // discovery — see hardware-config.js. Empty discovery URL
        // means no hardware path; downstream details (which model is
        // ready, transcribe vs analyze availability) are surfaced via
        // /admin/config's effective_* fields.
        hardware: !!cfg.relay_spark_control_url,
      },
      admin_enabled: !!cfg.relay_admin_password_hash,
    });
  });

  return router;
}