package de.szut.casino.security.jwt;

import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import java.io.IOException;

@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {

    private final JwtUtils jwtUtils;
    private final UserDetailsService userDetailsService;

    public JwtAuthenticationFilter(JwtUtils jwtUtils, UserDetailsService userDetailsService) {
        this.jwtUtils = jwtUtils;
        this.userDetailsService = userDetailsService;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        try {
            String jwt = parseJwt(request);
            if (jwt != null) {
                String username = jwtUtils.extractUsername(jwt);

                if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
                    UserDetails userDetails = userDetailsService.loadUserByUsername(username);

                    if (jwtUtils.validateToken(jwt, userDetails)) {
                        UsernamePasswordAuthenticationToken authToken = new UsernamePasswordAuthenticationToken(
                                userDetails, null, userDetails.getAuthorities());

                        authToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                        SecurityContextHolder.getContext().setAuthentication(authToken);
                    }
                }
            }
        } catch (Exception e) {
            logger.error("Cannot set user authentication: {}", e);
        }

        filterChain.doFilter(request, response);
    }

    private String parseJwt(HttpServletRequest request) {
        String headerAuth = request.getHeader("Authorization");

        if (StringUtils.hasText(headerAuth) && headerAuth.startsWith("Bearer ")) {
            return headerAuth.substring(7);
        }

        return null;
    }
}
