package com.api.base.config.auth;

import com.api.base.config.auth.service.DetailsService;
import com.api.common.JSONUtils;
import com.api.core.response.Result;
import com.api.core.response.ResultEnum;
import com.api.core.response.ResultGenerator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.RedisConnectionFailureException;
import org.springframework.http.HttpStatus;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
    @Value("${jwt.header}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;

    private DetailsService userDetailsService;
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    public JwtAuthenticationTokenFilter(DetailsService userDetailsService, JwtTokenUtil jwtTokenUtil) {
        this.userDetailsService = userDetailsService;
        this.jwtTokenUtil = jwtTokenUtil;

    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        try {

        String authHeader = request.getHeader(tokenHeader);
        if (authHeader != null && authHeader.startsWith(tokenHead)) {
            String authToken = authHeader.substring(tokenHead.length());

                    String username = jwtTokenUtil.getUsernameFromToken(authToken);
                    if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
                        UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                        if (jwtTokenUtil.validateToken(authToken, username)) {
                            UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                            authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                            SecurityContextHolder.getContext().setAuthentication(authentication);
                        }
                    }

        }
        filterChain.doFilter(request, response);
        }catch (Exception e){
            logger.error("TokenFilterException",e);
            response.setHeader("Content-Type", "application/json;charset=utf-8");
            response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
            Result result = ResultGenerator.genExceptionResult();
            if(e instanceof RedisConnectionFailureException){
                result = ResultGenerator.genResult(ResultEnum.REDIS_CONNECTION_FAILUR);
            }
            response.getWriter().write(JSONUtils.obj2json(result));
            response.getWriter().flush();
        }
    }






}