/*

 * 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);

            }

        }

    }

}