package eu.dnetlib.loginservice.security.oidc;

import eu.dnetlib.loginservice.properties.Properties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.logout.LogoutSuccessHandler;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

@Configuration
public class OpenAIRELogoutSuccessHandler implements LogoutSuccessHandler {

    private final Properties properties;

    @Autowired
    public OpenAIRELogoutSuccessHandler(Properties properties) {
        this.properties = properties;
    }

    private String encodeValue(String value) throws UnsupportedEncodingException {
        return URLEncoder.encode(value, StandardCharsets.UTF_8.toString());
    }

    @Override
    public void onLogoutSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException {
        HttpSession session = request.getSession();
        String redirect = (String) session.getAttribute("redirect");
        session.removeAttribute("redirect");
        if(redirect == null) {
            redirect = properties.getRedirect();
        }
        session.invalidate();
        response.sendRedirect(properties.getOidc().getLogout() + encodeValue(redirect));
    }
}