package com.onetoo.filter;


import com.alibaba.fastjson.JSON;
import com.onetoo.common.BaseContext;
import com.onetoo.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
//要在启动项目类中加上扫描！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！
public class LoginCheckFilter implements Filter {

    //    路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;


//        1、获取本次请求的URI
        String requestURI = request.getRequestURI();

        log.info("拦截到请求：{}",requestURI);
//        定义不需要处理的请求路径
        String[] urls = new String[]{
                "/member/login",
                "/member/logout",
                "/common/download",
                "/common/upload",
                "/member/register",
                "/member/findpassword",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"

        };

//      2、  判断本次请求是否需要处理

        boolean check=check(urls,requestURI);

//        3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }
//       4、判断登录状态，如果已经登录则放行
        if(request.getSession().getAttribute("member")!=null){
            log.info("用户已登录,用户的id   为：{}",request.getSession().getAttribute("member"));

            Long empId= (Long) request.getSession().getAttribute("member");
            BaseContext.setCurrentId(empId);


//            long id = Thread.currentThread().getId();
//            log.info("线程的id为：{}",id);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
//        5、如果未登录则返回未登录结果，通过输出流的方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url:urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }

        }
        return false;
    }

}
