/*

  * Quoridor server and related libraries

  * Copyright (C) 2009-2010 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, either version 3 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://www.gnu.org/licenses/.

  */

 package cz.xelfi.quoridor.freemarkerdor;

 import java.io.IOException;

 import java.util.Date;

 import java.util.Iterator;

 import java.util.Properties;

 import java.util.ServiceLoader;

 import javax.mail.Message;

 import javax.mail.MessagingException;

 import javax.mail.Session;

 import javax.mail.Transport;

 import javax.mail.internet.InternetAddress;

 import javax.mail.internet.MimeMessage;

 import org.openide.util.Exceptions;

 /** Send emails.

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 public abstract class EmailService {

     private static EmailService DEFAULT;

     public abstract void sendEmail(

         String address,

         String subject,

         String text

     ) throws IOException;

     public static synchronized EmailService getDefault() {

         if (DEFAULT == null) {

             Iterator<EmailService> it = ServiceLoader.load(EmailService.class).iterator();

             DEFAULT = it.hasNext() ? it.next() : new Impl();

         }

         return DEFAULT;

     }

     private static class Impl extends EmailService {

         private final Session session;

         public Impl() {

             Properties props = System.getProperties();

             final String host = "mail.smtp.host";

             if (props.get(host) == null) {

                 props.put(host,"localhost");

             }

             session = Session.getDefaultInstance(props, null);

         }

         @Override

         public void sendEmail(String address, String subject, String text) throws IOException {

             try {

                 MimeMessage message = new MimeMessage(session);

                 message.setFrom(new InternetAddress("quoridor@xelfi.cz"));

                 message.setSentDate(new Date());

                 message.addRecipient(Message.RecipientType.TO, new InternetAddress(address));

                 message.setSubject(subject);

                 message.setText(text);

                 Transport.send(message);

             } catch (MessagingException ex) {

                 throw new IOException(ex);

             }

         }

     }

 }