package com.nicatguliyev.jwt.learn_jwt.security;

import java.io.IOException;

import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
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 com.nicatguliyev.jwt.learn_jwt.service.JwtService;

import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

@Component
public class JWTAuthenticationFilter extends OncePerRequestFilter {

  private final JwtService jwtService;

  public JWTAuthenticationFilter(JwtService jwtService) {
    this.jwtService = jwtService;
  }

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

    //System.out.println("DOFILTERINTERNAL RUNNING");

    String autHeader = request.getHeader("Authorization");
    if (autHeader == null || !autHeader.startsWith("Bearer ")) {
      filterChain.doFilter(request, response);
      return;
    }

    String token = autHeader.substring(7);
    String username = jwtService.extractUserName(token);

    if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
      UserDetails userDetails = User.withUsername(username).password("").build();

      UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
        userDetails, null);
      authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
      SecurityContextHolder.getContext().setAuthentication(authenticationToken);

    }

    filterChain.doFilter(request, response);
  }

}