from __future__ import annotations

import os
import sys
from pathlib import Path


def app_data_dir() -> Path:
    if sys.platform == "darwin":
        base = Path.home() / "Library" / "Application Support"
    elif os.environ.get("LOCALAPPDATA"):
        base = Path(os.environ["LOCALAPPDATA"])
    else:
        base = Path.home() / "AppData" / "Local"
    d = base / "ProxyChainManager"
    d.mkdir(parents=True, exist_ok=True)
    return d


def gost_exe_path() -> Path:
    suffix = ".exe" if sys.platform == "win32" else ""
    return app_data_dir() / f"gost{suffix}"