"""Synthetic tool used only by the opt-in SDK fault suite. No device/network I/O."""

import json
import os
from pathlib import Path
import subprocess
import sys
import time


def main():
    mode = sys.argv[1]
    if mode == "sleep":
        time.sleep(60)
    elif mode == "tree":
        child = subprocess.Popen(
            [sys.executable, "-I", "-B", __file__, "sleep"],
            stdin=subprocess.DEVNULL,
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL,
            creationflags=subprocess.CREATE_NO_WINDOW if os.name == "nt" else 0,
        )
        Path(sys.argv[2]).write_text(json.dumps({"pid": child.pid}), encoding="utf-8")
        if sys.argv[3] == "linger":
            time.sleep(60)
    elif mode == "echo":
        data = sys.stdin.buffer.read()
        sys.stdout.buffer.write(data)
        sys.stderr.buffer.write(b"synthetic-stderr")
    elif mode == "overflow":
        while True:
            os.write(1, b"x" * 65536)
    elif mode == "failure":
        raise SystemExit(7)
    else:
        raise SystemExit(2)


if __name__ == "__main__":
    main()