package eu.dnetlib.openaire.usermanagement;

import eu.dnetlib.openaire.user.utils.EmailSender;
import eu.dnetlib.openaire.user.utils.LDAPActions;
import eu.dnetlib.openaire.user.utils.VerificationActions;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Timestamp;
import java.util.Date;
import java.util.UUID;

/**
 * Created by sofia on 20/10/2017.
 */
public class RegisterServlet extends HttpServlet {

    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,
                config.getServletContext());
    }

    @Autowired
    private VerificationActions verificationActions;

    @Autowired
    private EmailSender emailSender;

    @Autowired
    private LDAPActions ldapActions;

    private Logger logger = Logger.getLogger(RegisterServlet.class);

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setContentType("text/html");
        PrintWriter printWriter = response.getWriter();

        String firstName = request.getParameter("first_name").trim();
        String lastName = request.getParameter("last_name").trim();
        String organization = request.getParameter("organization").trim();
        String username = request.getParameter("username").trim();
        String email =request.getParameter("email").trim();
        String confirmEmail = request.getParameter("email_conf").trim();
        String password = request.getParameter("password");
        String confirmPassword = request.getParameter("password_conf");

        if (organization == null){
            logger.info("organization is null");
        }
        if (firstName != null && lastName != null &&  username != null &&
                email.equals(confirmEmail) && password.equals(confirmPassword) ) {

            try {

                 if (username.matches("^[a-zA-Z0-9][a-zA-Z0-9_-]{4,150}") && !ldapActions.usernameExists(username) && !ldapActions.emailExists(email)
                         && !ldapActions.isZombieUsersEmail(email) && !ldapActions.isZombieUsersUsername(username)) {

                     ldapActions.createZombieUser(username, email, firstName, lastName, organization, password);
                     logger.info("Zombie user successfully created");

                     UUID verificationCode = UUID.randomUUID();
                     Date creationDate = new Date();

                     Timestamp timestamp = new Timestamp(creationDate.getTime());

                     if (!verificationActions.verificationEntryExists(username)) {
                         verificationActions.addVerificationEntry(username, verificationCode.toString(), timestamp);

                     } else {
                         verificationActions.updateVerificationEntry(username, verificationCode.toString(), timestamp);
                     }

                     String scheme = request.getScheme();
                     String serverName = request.getServerName();
                     int portNumber = request.getServerPort();
                     String contextPath = request.getContextPath();
                     String resultPath;

                     if (portNumber == 80) {
                         resultPath = scheme + "://" + serverName + contextPath + "/activate.jsp";
                     } else {
                         resultPath = scheme + "://" +serverName + ":" +portNumber + contextPath + "/activate.jsp";
                     }

                     String verificationCodeMsg = "<p>Hello " + username + ",</p>" +
                             "<p> A request has been made to verify your email and activate your OpenAIRE account. To activate your " +
                             "account, you will need to submit your username and this activation code in order to verify that the" +
                             "request was legitimate.</p>" +
                             "<p>" +
                             "The activation code is " + verificationCode.toString() +
                             "</p>" +
                             "Select the URL below and proceed with activating your password." +
                             "<p><a href=" + resultPath + ">" + resultPath + "</a></p>" +
                             "<p>Thank you</p>";

                     String verificationCodeSubject = "Activate your OpenAIRE account";

                     emailSender.sendEmail(email, verificationCodeSubject, verificationCodeMsg);

                     response.sendRedirect("./activate.jsp");

                 } else {

                     if(!username.matches("^[a-zA-Z0-9][a-zA-Z0-9_-]{4,150}")){

                         if (username.length() < 5) {
                             request.getSession().setAttribute("username_message", "Minimum username length 5 characters.");
                             logger.info("Minimum username length 5 characters.");
                         }

                         if (username.length() > 150) {
                             request.getSession().setAttribute("username_message", "Maximum username lenght 150 characters.");
                             logger.info("Maximum username lenght 150 characters.");
                         }
                     }

                     if (ldapActions.usernameExists(username) || ldapActions.isZombieUsersUsername(username)) {
                        request.getSession().setAttribute("username_message", "Username already exists! Choose another one.");
                        logger.info("Username already exists");
                     }

                     if (ldapActions.emailExists(email)) {
                         request.getSession().setAttribute("email_message", "There is another user with this email.");
                         logger.info("There is another user with this email");
                     }

                     if (ldapActions.isZombieUsersEmail(email)) {
                         request.getSession().setAttribute("email_message", "You have already registered with this email address! Please check your email to activate your account or contact OpenAIRE <a href=\"https://www.openaire.eu/support/helpdesk\">helpdesk</a>.");
                         logger.info("There is another user with this email");
                     }

                     request.getSession().setAttribute("first_name", firstName);
                     request.getSession().setAttribute("last_name", lastName);
                     request.getSession().setAttribute("organization", organization);
                     request.getSession().setAttribute("username", username);
                     request.getSession().setAttribute("email", email);
                     request.getSession().setAttribute("email_conf", confirmEmail);

                     response.sendRedirect("./register.jsp");
                 }


            } catch (Exception e) {
                logger.error("LDAP error in creating user", e);
                response.sendRedirect("./error.jsp");
            }
        }
        printWriter.close();

    }
}