from pathlib import Path
import os
import time

LOCK_DIR = Path("/var/run/tg-bot")
LOCK_DIR.mkdir(parents=True, exist_ok=True)


def lock_path(name: str) -> Path:
    return LOCK_DIR / f"{name}.lock"


def acquire_lock(name: str) -> bool:
    p = lock_path(name)
    try:
        fd = os.open(str(p), os.O_CREAT | os.O_EXCL | os.O_WRONLY)
    except FileExistsError:
        return False
    try:
        os.write(fd, str(time.time()).encode("ascii", errors="ignore"))
    finally:
        os.close(fd)
    return True


def release_lock(name: str):
    p = lock_path(name)
    if p.exists():
        p.unlink()