package PresentationLayer;

import FunctionLayer.LogicFacade;
import FunctionLayer.LoginSampleException;
import FunctionLayer.User;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class Login extends Command {

    @Override
    String execute(HttpServletRequest request, HttpServletResponse response) throws LoginSampleException {

        String email = request.getParameter("email");
        String password = request.getParameter("password");

        // her henter vi salten fra brugeren, til at validere brugeren.
        try {
            byte[] salt = LogicFacade.getSalt(email);

            byte[] attemptedPassword = LogicFacade.getEncryptedPassword(password, salt);

            if (LogicFacade.authenticate(password, attemptedPassword, salt)) {

                User user = null;
                user = LogicFacade.login(email, password);

                HttpSession session = request.getSession();
                session.setAttribute("user", user);
                session.setAttribute("role", user.getRole());

                return user.getRole() + "page";

            } else {

                // Vi logger salten og det hashede password til loggeren
            }

        } catch (NoSuchAlgorithmException | InvalidKeySpecException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);

            String errorMessage = "We have an internal problem, but we are working as hard as possible, to solve it.";
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
            request.setAttribute("errorMessage", errorMessage);
            try {
                request.getRequestDispatcher("/index.jsp").forward(request, response);
            } catch (ServletException | IOException ex1) {
                Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex1);
            }
            // her bliver der kun kastet en error, hvis det er vores valideringsmetoder, der ikke virker... // tror jeg

            // her bliver der kun kastet en error, hvis det er vores valideringsmetoder, der ikke virker... // tror jeg
        } catch (LoginSampleException ex) {
            String errorMessage = "The retrived password or username did not match, please try again.";
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
            request.setAttribute("errorMessage", errorMessage);

            try {
                request.getRequestDispatcher("/index.jsp").forward(request, response);
            } catch (ServletException | IOException ex1) {
                Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex1);
            }
        }
        return null;
    }
}