package com.agendaestudantil.filtro;

import com.agendaestudantil.utilitario.UtilJwt;
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.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import java.io.IOException;

@Component
public class FiltroJwt extends OncePerRequestFilter {

    private final UtilJwt utilJwt;
    private final UserDetailsService userDetailsService;

    public FiltroJwt(UtilJwt utilJwt, UserDetailsService userDetailsService) {
        this.utilJwt = utilJwt;
        this.userDetailsService = userDetailsService;
    }

    @Override
    protected boolean shouldNotFilter(HttpServletRequest request) {
        String path = request.getRequestURI();
        return path.equals("/") || path.equals("/index.html") || path.equals("/favicon.ico")
                || path.startsWith("/static/") || path.startsWith("/css/") || path.startsWith("/js/") 
                || path.startsWith("/img/") || path.endsWith(".css") || path.endsWith(".js") 
                || path.endsWith(".ico") || path.endsWith(".html");
    }

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

        String header = request.getHeader("Authorization");
        String token = null;
        String estudanteId = null;

        if (header != null && header.startsWith("Bearer ")) {
            token = header.substring(7);
            estudanteId = utilJwt.getEstudanteIdFromToken(token);
        }

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

            if (utilJwt.validateToken(token)) {
                UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                        userDetails, null, userDetails.getAuthorities());
                SecurityContextHolder.getContext().setAuthentication(authentication);
            }
        }

        filterChain.doFilter(request, response);
    }
}