package com.isu.gaswellwatch.config;


import cn.dev33.satoken.context.SaHolder;
import cn.dev33.satoken.exception.NotLoginException;
import cn.dev33.satoken.filter.SaServletFilter;
import cn.dev33.satoken.router.SaRouter;
import cn.dev33.satoken.stp.StpUtil;
import cn.dev33.satoken.util.SaResult;
import cn.hutool.core.collection.CollectionUtil;
import com.isu.gaswellwatch.constants.UserConstant;
import com.isu.gaswellwatch.exception.BusinessException;
import com.isu.gaswellwatch.service.UserService;
import com.isu.gaswellwatch.vo.MenuVO;
import com.isu.gaswellwatch.vo.UserLoginInfoVO;
import jakarta.annotation.Resource;
import org.apache.commons.lang3.StringUtils;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Configuration
public class SaTokenConfigure {

    @Resource
    private InterfacePermissionSettings settings;
    @Resource
    private UserService userService;

    // 注册 Sa-Token全局过滤器
    @Bean
    public SaServletFilter getSaServletFilter() {
        return new SaServletFilter()
                // 拦截地址 拦截全部path
                .addInclude("/**")
                // 开放地址
                .addExclude("/favicon.ico")
                // 鉴权方法：每次访问进入
                .setAuth(obj -> {
                    // 登录校验 -- 拦截所有路由，并排除/user/doLogin 用于开放登录
                    SaRouter.match("/**")
                            .notMatch( "/user/doLogin","/user/file/files")
                            .check(r -> {
                        StpUtil.checkLogin();
                        checkPermission();
                    });
                })
                // 异常处理方法：每次setAuth函数出现异常时进入
                .setError(e -> {
                    if(e instanceof NotLoginException){
                        return SaResult.error(UserConstant.NOT_LOGIN_MSG).setCode(UserConstant.NOT_LOGIN_CODE);
                    }
                    return SaResult.error(e.getMessage());
                })

                // 前置函数：在每次认证函数之前执行（BeforeAuth 不受 includeList 与 excludeList 的限制，所有请求都会进入）
                .setBeforeAuth(obj -> {
                    // ---------- 设置跨域响应头 ----------
                    SaHolder.getResponse()
                            // 允许指定域访问跨域资源
                            .setHeader("Access-Control-Allow-Origin", "*")
                            // 允许所有请求方式
                            .setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE")
                            // 有效时间
                            .setHeader("Access-Control-Max-Age", "3600")
                            // 允许的header参数
                            .setHeader("Access-Control-Allow-Headers", "*");

                });
    }


    private void checkPermission() {
        //先判断接口是否为限制接口
        HashMap<String, List<String>> identifier = settings.getIdentifier();
        String res= "";
        String requestPath = SaHolder.getRequest().getRequestPath();
        if(identifier == null) return;
        for (Map.Entry<String, List<String>> entry : identifier.entrySet()) {
            if(entry.getValue().contains(requestPath)){
                res = entry.getKey();
            }
        }
        //是限制接口才校验，不是直接放行
        if(StringUtils.isNotBlank(res)){
            //获取token对应的菜单列表
            UserLoginInfoVO userLoginInfoVO = (UserLoginInfoVO) StpUtil.getTokenSession().get(UserConstant.TOKEN_SESSION);
            List<MenuVO> menuList = userService.getMenuList(userLoginInfoVO.getUserVO().getUsername());
            if(CollectionUtil.isEmpty(menuList)) throw new BusinessException("未获取到用户菜单");
            //判断菜单和标识是否合法
            String menuId = SaHolder.getRequest().getHeader(UserConstant.HEADER_MENU_ID);
            if(StringUtils.isBlank(menuId)) throw new BusinessException("未获取到请求发出所在菜单");
            boolean flag = false;
            for (MenuVO menuVO : menuList) {
                if(menuId.equals(menuVO.getId().toString())) {
                    if(res.equals(menuVO.getIdentifier())){
                        flag = true;
                        break;
                    }
                }
            }
            if(!flag) throw new BusinessException("该用户没有接口" + requestPath +"的权限");
        }
    }
}