/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

 * License.  When distributing the software, include this License Header

 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * Contributor(s):

 *

 * Portions Copyrighted 2009 Jaroslav Tulach

 */

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);

            }

        }

    }

}