#!/usr/bin/env node
// Unified entry point for the Codex CLI.

import path from "path";
import { fileURLToPath } from "url";

// __dirname equivalent in ESM
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const { platform, arch } = process;

let targetTriple = null;
switch (platform) {
  case "linux":
  case "android":
    switch (arch) {
      case "x64":
        targetTriple = "x86_64-unknown-linux-musl";
        break;
      case "arm64":
        targetTriple = "aarch64-unknown-linux-musl";
        break;
      default:
        break;
    }
    break;
  case "darwin":
    switch (arch) {
      case "x64":
        targetTriple = "x86_64-apple-darwin";
        break;
      case "arm64":
        targetTriple = "aarch64-apple-darwin";
        break;
      default:
        break;
    }
    break;
  case "win32":
    switch (arch) {
      case "x64":
        targetTriple = "x86_64-pc-windows-msvc.exe";
        break;
      case "arm64":
        // We do not build this today, fall through...
      default:
        break;
    }
    break;
  default:
    break;
}

if (!targetTriple) {
  throw new Error(`Unsupported platform: ${platform} (${arch})`);
}

const binaryPath = path.join(__dirname, "..", "bin", `codex-${targetTriple}`);

// Use an asynchronous spawn instead of spawnSync so that Node is able to
// respond to signals (e.g. Ctrl-C / SIGINT) while the native binary is
// executing. This allows us to forward those signals to the child process
// and guarantees that when either the child terminates or the parent
// receives a fatal signal, both processes exit in a predictable manner.
const { spawn } = await import("child_process");

const child = spawn(binaryPath, process.argv.slice(2), {
  stdio: "inherit",
  env: { ...process.env, CODEX_MANAGED_BY_NPM: "1" },
});

child.on("error", (err) => {
  // Typically triggered when the binary is missing or not executable.
  // Re-throwing here will terminate the parent with a non-zero exit code
  // while still printing a helpful stack trace.
  // eslint-disable-next-line no-console
  console.error(err);
  process.exit(1);
});

// Forward common termination signals to the child so that it shuts down
// gracefully. In the handler we temporarily disable the default behavior of
// exiting immediately; once the child has been signaled we simply wait for
// its exit event which will in turn terminate the parent (see below).
const forwardSignal = (signal) => {
  if (child.killed) {
    return;
  }
  try {
    child.kill(signal);
  } catch {
    /* ignore */
  }
};

["SIGINT", "SIGTERM", "SIGHUP"].forEach((sig) => {
  process.on(sig, () => forwardSignal(sig));
});

// When the child exits, mirror its termination reason in the parent so that
// shell scripts and other tooling observe the correct exit status.
// Wrap the lifetime of the child process in a Promise so that we can await
// its termination in a structured way. The Promise resolves with an object
// describing how the child exited: either via exit code or due to a signal.
const childResult = await new Promise((resolve) => {
  child.on("exit", (code, signal) => {
    if (signal) {
      resolve({ type: "signal", signal });
    } else {
      resolve({ type: "code", exitCode: code ?? 1 });
    }
  });
});

if (childResult.type === "signal") {
  // Re-emit the same signal so that the parent terminates with the expected
  // semantics (this also sets the correct exit code of 128 + n).
  process.kill(process.pid, childResult.signal);
} else {
  process.exit(childResult.exitCode);
}

