package com.dy.common.webFilter;

import com.alibaba.fastjson2.JSON;
import com.dy.common.contant.Constant;
import com.dy.common.webUtil.BaseResponse;
import com.dy.common.webUtil.BaseResponseUtils;
import com.mysql.cj.util.StringUtils ;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import java.io.IOException;
import java.io.PrintWriter;

@Slf4j
public class UserTokenFilter implements Filter {


    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) servletRequest;
        String requestURI = httpRequest.getRequestURI();
        // 检查请求是否为非过滤项
        if (UserTokenNoFilter.urls != null && UserTokenNoFilter.urls.stream().anyMatch(url -> requestURI.startsWith(url))) {
            // 如果是非过滤项，直接调用下一个过滤器或servlet
            filterChain.doFilter(servletRequest, servletResponse);
        } else {
            // 如果不是非过滤项，执行过滤逻辑
            HttpServletRequest request = (HttpServletRequest) servletRequest;
            HttpServletResponse response = (HttpServletResponse) servletResponse;
            String token = request.getHeader(Constant.UserTokenKeyInHeader);
            if(!StringUtils.isNullOrEmpty(token)){
                UserTokenContext.set(token);
                filterChain.doFilter(servletRequest, servletResponse);
            }else{
                PrintWriter pw = null ;
                try {
                    BaseResponse<?> res = BaseResponseUtils.buildToLogin() ;
                    String jsonString = JSON.toJSONString(res);
                    response.setCharacterEncoding("UTF-8");
                    response.setContentType("application/json; charset=utf-8");
                    pw = response.getWriter() ;
                    pw.write(jsonString);
                    pw.flush();
                } catch (IOException e) {
                    e.printStackTrace();
                }finally {
                    if(pw != null){
                        pw.close();
                    }
                }
                //request.setAttribute(Constant.ErrorKeyInRequest, "未得到用户token");
                //response.sendRedirect("/error");
            }
        }
    }

    @Override
    public void destroy() {
    }
}