package com.weiwojc.security;

import com.weiwojc.utils.JwtUtils;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.RequiredArgsConstructor;
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 java.io.IOException;
import java.util.ArrayList;

@Component
@RequiredArgsConstructor
public class JwtAuthenticationFilter extends OncePerRequestFilter {

    private final JwtUtils jwtUtils;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        
        String token = request.getHeader("token");
        
        if (token == null || token.isEmpty()) {
            filterChain.doFilter(request, response);
            return;
        }

        if (!jwtUtils.validateToken(token)) {
            filterChain.doFilter(request, response);
            return;
        }

        String username = jwtUtils.getUsernameFromToken(token);
        Long userId = jwtUtils.getUserIdFromToken(token);

        if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
            UserDetails userDetails = new JwtUserDetails(userId, username);
            
            UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                    userDetails, null, new ArrayList<>());
            
            authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
            
            SecurityContextHolder.getContext().setAuthentication(authentication);
        }

        filterChain.doFilter(request, response);
    }
}