package be.mentoringsystems.merke.security;

import be.mentoringsystems.merke.model.db.Login;
import be.mentoringsystems.merke.service.LoginService;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;

/**
 *
 * @author anthonyarents
 */
@Component
public class JWTAuthenticationFilter implements Filter {

    @Autowired
    private LoginService loginService;
    private static final Logger LOGGER = LogManager.getLogger(JWTAuthenticationFilter.class);

    @Override
    public void doFilter(final ServletRequest sr, final ServletResponse sr1, final FilterChain fc) throws IOException, ServletException {
        if (sr instanceof HttpServletRequest) {
            final HttpServletRequest hsr = (HttpServletRequest) sr;
            final HttpServletResponse hsr1 = (HttpServletResponse) sr1;
            String username = JWSHelper.getJwsSubject(hsr);

            Login login = loginService.getCurrentLogin();
            if (username == null) {
                LOGGER.debug("found no jwt token");
                if (login != null) {
                    LOGGER.debug("user is logged in, making a new jwt token");
                    String token = JWSHelper.generateJwsWithSubject(login.getEmail());
                    hsr1.addHeader(JWSHelper.HEADER_NAME, JWSHelper.TOKEN_PREFIX + token);
                }
            } else {
                LOGGER.debug("found jwt token");
                if (login == null) {
                    UserDetails details = loginService.getByUsername(username);
                    if (details != null) {
                        details = loginService.loadUserByUsername(username);
                        LOGGER.debug("user is not logged in, logging in as {0}", details.getUsername());
                        UsernamePasswordAuthenticationToken auth = new UsernamePasswordAuthenticationToken(details, null, details.getAuthorities());
                        SecurityContextHolder.getContext().setAuthentication(auth);
                    }
                }
                //hsr1.addHeader(JWSHelper.HEADER_NAME, JWSHelper.TOKEN_PREFIX + token);
            }
        }
        fc.doFilter(sr, sr1);
    }

    @Override
    public void init(final FilterConfig fc) throws ServletException {
    }

    @Override
    public void destroy() {
    }

}