import { execFileSync, spawn } from "node:child_process";
import { existsSync } from "node:fs";

const isWindows = process.platform === "win32";

function detectPackageManager() {
  const userAgent = process.env.npm_config_user_agent ?? "";

  if (userAgent.startsWith("pnpm/")) {
    return "pnpm";
  }

  if (userAgent.startsWith("yarn/")) {
    return "yarn";
  }

  if (userAgent.startsWith("npm/")) {
    return "npm";
  }

  if (existsSync("pnpm-lock.yaml")) {
    return "pnpm";
  }

  if (existsSync("yarn.lock")) {
    return "yarn";
  }

  return "npm";
}

const packageManager = detectPackageManager();
const commands = [
  `${packageManager} run dev:server`,
  `${packageManager} run dev`,
];

function startCommand(command) {
  if (isWindows) {
    return spawn("cmd.exe", ["/d", "/s", "/c", command], {
      cwd: process.cwd(),
      stdio: "inherit",
    });
  }

  return spawn(command, {
    cwd: process.cwd(),
    stdio: "inherit",
    shell: true,
  });
}

const children = commands.map(startCommand);
let shuttingDown = false;

function stopChild(child) {
  if (child.exitCode !== null || child.killed) {
    return;
  }

  if (isWindows) {
    try {
      execFileSync("taskkill", ["/pid", String(child.pid), "/t", "/f"], {
        stdio: "ignore",
      });
    } catch {
    }
    return;
  }

  try {
    child.kill("SIGTERM");
  } catch {
  }
}

function shutdown(code = 0) {
  if (shuttingDown) {
    return;
  }

  shuttingDown = true;
  children.forEach(stopChild);
  process.exit(code);
}

process.on("SIGINT", () => shutdown(0));
process.on("SIGTERM", () => shutdown(0));

children.forEach((child) => {
  child.on("error", () => shutdown(1));
  child.on("exit", (code) => {
    if (shuttingDown) {
      return;
    }

    shutdown(code ?? 0);
  });
});