"""影子柜台 CLI 入口。

用法:
    python -m sanguo_trader.shadow             # 读 env(见 runner.py docstring)
    python -m sanguo_trader.shadow --auto      # 主管模式:轮询 paper 库自动拉起影子账户
"""
from __future__ import annotations

import logging
import os
import sys
from pathlib import Path

LOCK_FILE = Path(
    os.environ.get("SANGUO_SHADOW_LOCK")
    or Path.home() / ".sanguo_shadow_desk.lock"
)


def _acquire_lock() -> "object | None":
    """单实例锁(Windows/msvcrt 与 POSIX/fcntl 双兼容)。"""
    LOCK_FILE.parent.mkdir(parents=True, exist_ok=True)
    try:
        import fcntl  # POSIX

        fh = open(LOCK_FILE, "w")
        fcntl.flock(fh, fcntl.LOCK_EX | fcntl.LOCK_NB)
        return fh
    except ImportError:
        pass
    except OSError:
        return None  # 已有实例在跑
    try:
        import msvcrt  # Windows

        fh = open(LOCK_FILE, "w")
        msvcrt.locking(fh.fileno(), msvcrt.LK_NBLCK, 1)
        return fh
    except (ImportError, OSError):
        return None


def main() -> int:
    logging.basicConfig(
        level=logging.INFO,
        format="%(asctime)s %(levelname)s %(name)s: %(message)s",
    )
    if "--auto" in sys.argv:
        from .supervisor import run_auto_supervisor

        run_auto_supervisor()
        return 0
    lock = _acquire_lock()
    if lock is None:
        print("影子柜台已在运行(锁占用),本次启动退出。", flush=True)
        return 0
    from .runner import run_shadow

    run_shadow()
    return 0


if __name__ == "__main__":
    sys.exit(main())