// `npm run local` launcher: build pages + config, then run the standalone
// mock API and `next dev` together, tearing both down on exit. Cross-platform
// (no concurrently dependency).
//
// `npm run local:lan` binds the dev server to 0.0.0.0 and prints the LAN URLs so
// a phone / foldable on the same Wi-Fi can load the site for real-device testing.
import { spawn, spawnSync } from "node:child_process";
import os from "node:os";

const LAN = process.argv.includes("--lan");
const PORT = process.env.PORT || "3000";

// Every non-internal IPv4 the machine answers on. VPN adapters show up here too,
// so print them all and let the tester pick the one their phone can reach.
const lanAddresses = () =>
  Object.entries(os.networkInterfaces()).flatMap(([name, addrs]) =>
    (addrs || [])
      .filter((a) => a.family === "IPv4" && !a.internal)
      .map((a) => ({ name, address: a.address })),
  );

// Prep static outputs the dev server serves.
for (const s of ["build-config.mjs", "build-pages.mjs"]) {
  const r = spawnSync(process.execPath, [`scripts/${s}`], { stdio: "inherit" });
  if (r.status !== 0) process.exit(r.status || 1);
}

const children = [];
const start = (cmd, args, opts = {}) => {
  const c = spawn(cmd, args, { stdio: "inherit", ...opts });
  children.push(c);
  return c;
};

// Mock API (127.0.0.1:4100) — next.config proxies /api/mock/* here. Spawn node
// directly (no shell) so a spaced node path (e.g. Program Files) is safe.
start(process.execPath, ["scripts/mock-server.mjs"]);
// Next dev — resolved from node_modules/.bin via the shell (npm puts it on PATH).
const devArgs = ["dev", "-p", PORT, ...(LAN ? ["-H", "0.0.0.0"] : [])];
const dev = start("next", devArgs, { shell: true });

if (LAN) {
  const ips = lanAddresses();
  console.log("\n  Open on a device on the same network:");
  for (const { name, address } of ips) console.log(`    http://${address}:${PORT}/en   (${name})`);
  if (!ips.length) console.log("    no external IPv4 found — is the machine on a network?");
  console.log(
    "\n  If the phone can't connect: allow node.exe through Windows Firewall on the\n" +
      "  private network, and disconnect any VPN (its adapter shadows the LAN route).\n",
  );
}

const shutdown = () => { for (const c of children) { try { c.kill(); } catch {} } };
dev.on("exit", (code) => { shutdown(); process.exit(code ?? 0); });
process.on("SIGINT", () => { shutdown(); process.exit(0); });
process.on("SIGTERM", () => { shutdown(); process.exit(0); });