from fastapi import Request

from common.context import RequestContext
from config.env import AppConfig
from exceptions.exception import PermissionException


class DependencyUtil:
    """
    依赖项工具类
    """

    @classmethod
    def check_exclude_routes(cls, request: Request, err_msg: str = '当前路由不在认证规则内，不可使用该依赖项') -> None:
        """
        检查路径和方法是否匹配排除路由模式

        :param request: 请求对象
        :param err_msg: 错误信息
        :return: None
        """
        # 获取当前请求路径和方法
        path = request.url.path
        method = request.method.upper()

        # 从配置中获取APP_ROOT_PATH
        app_root_path = AppConfig.app_root_path

        # 去掉APP_ROOT_PATH前缀
        if app_root_path and path.startswith(app_root_path):
            path = path[len(app_root_path) :]

        # 获取编译后的排除路由模式列表
        exclude_patterns = RequestContext.get_current_exclude_patterns()

        # 检查当前路由是否在排除路由列表中
        if path and method and exclude_patterns:
            for item in exclude_patterns:
                pattern = item['pattern']
                exclude_methods = item['methods']
                ignore_paths = item['ignore_paths']

                # 检查当前路径是否在忽略列表中
                if path in ignore_paths:
                    continue

                # 检查路径是否匹配，并且methods为空列表（匹配所有方法）或者当前方法在允许列表中
                if pattern.match(path) and (not exclude_methods or method in exclude_methods):
                    raise PermissionException(data='', message=err_msg)