import asyncio
import threading
from datetime import datetime

import pytz


# 后台操作
def async_new_task(func, *args, **kwargs):
    threading.Thread(target=func, args=args, kwargs=kwargs, daemon=True).start()


async def async_task(func, *args, **kwargs):
    return await asyncio.to_thread(func, *args, **kwargs)


def format_datetime(dt: datetime, tz="Asia/Shanghai"):
    if dt.tzinfo is None:
        dt = pytz.UTC.localize(dt)
    tz_obj = pytz.timezone(tz)
    dt = dt.astimezone(tz_obj)
    return dt.strftime("%Y-%m-%d %H:%M:%S")


def safe_round(value, ndigits=2, default=None):
    return round(value, ndigits) if value is not None else default


def build_dept_tree(depts):
    dept_map = {d["id"]: d for d in depts}

    roots = []

    for d in depts:
        pid = d["pid"]
        if pid and pid in dept_map:
            dept_map[pid]["children"].append(d)
        else:
            # pid 为 0 或不存在 → 顶层
            roots.append(d)

    return roots


def build_menu_tree(items):
    item_map = {item["id"]: item for item in items}
    tree = []

    for item in items:
        pid = item["pid"]
        if pid and pid in item_map:
            item_map[pid]["children"].append(item)
        else:
            tree.append(item)

    return tree


from uuid import UUID


def is_valid_uuid(value: str):
    try:
        UUID(value)
        return True
    except:
        return False