package org.apache.maven.announcement;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.SocketException;
import java.util.StringTokenizer;

import org.apache.commons.net.smtp.SMTPClient;
import org.apache.commons.net.smtp.SMTPReply;
import org.apache.commons.net.smtp.SimpleSMTPHeader;

/* ====================================================================
 *   Copyright 2003-2004 The Apache Software Foundation.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * ====================================================================
 */

/**
 * Send an email message using Jakarta Commons Net
 */
public class MailUtils {

	private static final String ADRESSES_SEPARATOR = ",";

	public static String sendMail(String server, String from, String to,
			String subject, String msg) {

		// check arguments
		if (server == null) {
			return "no smtp server configured";
		}
		if (to == null) {
			return "no to address specified";
		}
		if (from == null) {
			return "no from address specified";
		}
		if (msg == null) {
			return "no message specified";
		}
		if (subject == null) {
			return "no subject specified";
		}

		// create a SMTP connection
		SMTPClient client = new SMTPClient();
		System.out.println("connecting to SMTP Server " + server);
		try {
			client.connect(server);
			// checks the server reply
			int reply = client.getReplyCode();
			if (!SMTPReply.isPositiveCompletion(reply)) {
				client.disconnect();
				return "SMTP server " + server + " refused connection.";
			}
			// Set the sender and recipient(s)
			client.setSender(from);
			// parse out the to addresses
			StringTokenizer st = new StringTokenizer(to.toString(),
					ADRESSES_SEPARATOR);
			while (st.hasMoreTokens()) {
				client.addRecipient(st.nextToken().trim());
			}

			System.out.println("Sending message from " + from + " to " + to);

			// Use the SimpleSMTPHeader class to build the header
			PrintWriter writer = new PrintWriter(client.sendMessageData());
			SimpleSMTPHeader header = new SimpleSMTPHeader(from, to, subject);

			//NOTE: if would be nice to add some Maven info here
			//            header.addHeaderField("Organization", "xxx");

			// Write the header to the SMTP Server
			writer.write(header.toString());

			// Write the body of the message
			writer.write(msg);

			// Close the writer
			writer.close();
			if (!client.completePendingCommand()) { // failure
				return "could not send the SMTP message";
			}

			// Logout from the e-mail server (QUIT)
			client.logout();

			// Close the connection
			client.disconnect();
			
			// everything is fine
			return "ok";
		} catch (SocketException e) {
			e.printStackTrace();
			return e.getMessage();
		} catch (IOException e) {
			e.printStackTrace();
			return e.getMessage();
		}
	}

}