#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from __future__ import annotations

import html
from datetime import datetime
from typing import Optional

import pytz

# ==================== 时区处理工具函数 ====================

CST_TZ = pytz.timezone("Asia/Shanghai")


def get_cst_now() -> datetime:
    return datetime.now(CST_TZ)


def get_cst_now_str() -> str:
    return get_cst_now().strftime("%Y-%m-%d %H:%M:%S")


def parse_cst_datetime(datetime_str: str) -> datetime:
    naive = datetime.strptime(datetime_str, "%Y-%m-%d %H:%M:%S")
    return CST_TZ.localize(naive)


# ==================== 安全工具（与 app_security 保持兼容） ====================


def escape_html(text: Optional[object]) -> str:
    try:
        from app_security import escape_html as _escape_html

        return _escape_html(text)
    except Exception:
        if text is None:
            return ""
        return html.escape(str(text))


def sanitize_sql_like_pattern(pattern: Optional[object]) -> str:
    try:
        from app_security import sanitize_sql_like_pattern as _sanitize_sql_like_pattern

        return _sanitize_sql_like_pattern(pattern)
    except Exception:
        if pattern is None:
            return ""
        return str(pattern).replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")