package com.project.ding.utils;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.GrantedAuthority;

import java.util.Collections;
import java.util.List;
import java.util.Optional;

public class SecurityUtils {
    /**
     * 获取当前登录用户的 ID
     */
    public static String getUserId() {
        return getAuthentication()
                .map(auth -> (String) auth.getPrincipal())
                .orElse(null);
    }

    public static List<String> getUserRoles() {
        return getAuthentication()
                .map(auth -> auth.getAuthorities().stream()
                        .map(GrantedAuthority::getAuthority)
                        .toList())
                .orElse(Collections.emptyList());
    }

    /**
     * 判断当前用户是否拥有某个角色
     * @param role 角色名称
     */
    public static boolean hasRole(String role) {
        return getUserRoles().contains(role);
    }


    /**
     * 获取当前认证信息
     */
    private static Optional<Authentication> getAuthentication() {
        return Optional.ofNullable(SecurityContextHolder.getContext().getAuthentication());
    }
}