"""
通用工具函数
提供项目中常用的基础功能
"""

import os
from pathlib import Path
from urllib.parse import urlsplit, unquote

def clean_env_value(value):
    """
    清理环境变量值，去除首尾空白字符

    Args:
        value: 环境变量的原始值

    Returns:
        str or None: 清理后的值，如果为空或None则返回None
    """
    if value is None:
        return None
    stripped = value.strip()
    return stripped or None


def parse_headless_mode(headless_setting):
    """
    解析headless模式配置

    Args:
        headless_setting: headless配置值

    Returns:
        bool or str: True表示headless，False表示有界面，'virtual'表示虚拟模式
    """
    if str(headless_setting).lower() == 'true':
        return True
    elif str(headless_setting).lower() == 'false':
        return False
    else:
        return 'virtual'


def ensure_dir(path):
    """
    确保目录存在，如果不存在则创建

    Args:
        path: 目录路径（可以是字符串或Path对象）
    """
    if isinstance(path, str):
        path = Path(path)
    os.makedirs(path, exist_ok=True)


def parse_proxy_config(proxy_value):
    """
    解析代理配置字符串为 Playwright/Camoufox 需要的 dict 结构

    支持格式:
    - scheme://user:pass@host:port
    - scheme://host:port
    - host:port
    - user:pass@host:port (默认 http)

    Returns:
        dict or None: {"server": "...", "username": "...", "password": "..."} 或 None
    """
    if not proxy_value:
        return None

    proxy_value = proxy_value.strip()
    if not proxy_value:
        return None

    if "://" in proxy_value:
        parsed = urlsplit(proxy_value)
        if not parsed.hostname:
            return {"server": proxy_value}
        scheme = parsed.scheme
    else:
        parsed = urlsplit(f"//{proxy_value}")
        if not parsed.hostname:
            return {"server": proxy_value}
        scheme = "http"

    host = parsed.hostname
    if host and ":" in host and not host.startswith("["):
        host = f"[{host}]"
    server = f"{scheme}://{host}"
    if parsed.port:
        server += f":{parsed.port}"

    result = {"server": server}
    if parsed.username:
        result["username"] = unquote(parsed.username)
    if parsed.password:
        result["password"] = unquote(parsed.password)
    return result