// EST 서버 감시: 작업 데이터 디렉터리는 감시하지 않는다.
const { spawn } = require("node:child_process");
const fs = require("node:fs");
const path = require("node:path");

const base = __dirname;
let child,
  timer,
  restarting = false,
  stopping = false;

function start() {
  child = spawn(process.execPath, [path.join(base, "server.cjs")], {
    cwd: base,
    env: process.env,
    stdio: "inherit",
  });
  child.on("exit", (code, signal) => {
    if (stopping) return;
    if (restarting) {
      restarting = false;
      start();
    } else {
      console.error(`[supervisor] 서버 종료: ${code ?? signal}`);
      process.exit(code || 1);
    }
  });
}

const watcher = fs.watch(base, (event, filename) => {
  const name = filename && filename.toString();
  if (!name || name === "watch-server.cjs" || !/\.(?:js|cjs|html|css)$/i.test(name)) return;
  clearTimeout(timer);
  timer = setTimeout(() => {
    if (restarting || stopping) return;
    restarting = true;
    console.log(`[supervisor] 변경 감지: ${name}`);
    child.kill();
  }, 300);
});
watcher.on("error", (error) => {
  console.error(`[supervisor] 감시 오류: ${error.message}`);
  stopping = true;
  child.kill();
  process.exit(1);
});

for (const signal of ["SIGINT", "SIGTERM", "SIGHUP"]) {
  process.on(signal, () => {
    stopping = true;
    clearTimeout(timer);
    watcher.close();
    child.kill();
    process.exit(0);
  });
}
start();