/**
 * Copyright (C) 2001-2017 by RapidMiner and the contributors
 * 
 * Complete list of developers available at our web site:
 * 
 * http://rapidminer.com
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 * 
 * 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
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program.
 * If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.tools;

import com.rapidminer.RapidMiner;
import com.rapidminer.operator.MailNotSentException;

import java.util.Map;
import java.util.logging.Level;

import javax.mail.Session;


/**
 * 
 * @author Simon Fischer, Nils Woehler
 * 
 */
public class MailUtilities {

	private static MailSessionFactory mailFactory = new DefaultMailSessionFactory();

	public static void setMailSessionFactory(MailSessionFactory mailFactory) {
		MailUtilities.mailFactory = mailFactory;
	}

	public static void sendEmail(String address, String subject, String content) {
		sendEmail(address, subject, content, null);

	}

	/**
	 * Sends a mail to the given address, using the specified subject and contents. Subject must
	 * contain no whitespace!
	 * 
	 * @param headers
	 */
	public static void sendEmail(String address, String subject, String content, Map<String, String> headers) {
		try {
			sendEmailWithException(address, subject, content, headers);
		} catch (MailNotSentException e) {
			// this methods throws no exceptions
		}
	}

	public static void sendEmailWithException(String address, String subject, String content, Map<String, String> headers)
			throws MailNotSentException {
		try {
			String method = ParameterService.getParameterValue(RapidMiner.PROPERTY_RAPIDMINER_TOOLS_MAIL_METHOD);
			int methodIndex = -1;
			if (method != null) {
				try {
					methodIndex = Integer.parseInt(method);
				} catch (NumberFormatException e) {
					methodIndex = -1;
					for (int i = 0; i < RapidMiner.PROPERTY_RAPIDMINER_TOOLS_MAIL_METHOD_VALUES.length; i++) {
						if (RapidMiner.PROPERTY_RAPIDMINER_TOOLS_MAIL_METHOD_VALUES[i].equals(method)) {
							methodIndex = i;
							break;
						}
					}
				}
			}
			if (methodIndex == -1) {
				methodIndex = RapidMiner.PROPERTY_RAPIDMINER_TOOLS_MAIL_METHOD_SMTP;
			}

			MailSender mailSender = null;
			switch (methodIndex) {
				case RapidMiner.PROPERTY_RAPIDMINER_TOOLS_MAIL_METHOD_SMTP:
					mailSender = new MailSenderSMTP();
					break;
				case RapidMiner.PROPERTY_RAPIDMINER_TOOLS_MAIL_METHOD_SENDMAIL:
					mailSender = new MailSenderSendmail();
					break;
				default:
					// LogService.getGlobal().log("Illegal send mail method: " + method + ".",
					// LogService.ERROR);
					LogService.getRoot().log(Level.SEVERE, "com.rapidminer.tools.MailUtilities.illegal_send_mail_method",
							method);
					throw new MailNotSentException("Illegal send mail method", "illegal_send_mail_method", method);
			}

			if (mailSender != null) {
				mailSender.sendEmail(address, subject, content, headers);
				// LogService.getRoot().info("Sent mail to "+address+" with subject "+subject);
				LogService.getRoot().log(Level.INFO, "com.rapidminer.tools.MailUtilities.sent_mail_to_adress_with_subject",
						new Object[] { address, subject });
			}
		} catch (Exception e) {
			// LogService.getGlobal().log("Cannot send mail to " + address + ": " + e,
			// LogService.ERROR);
			LogService.getRoot().log(Level.SEVERE, "com.rapidminer.tools.MailUtilities.sending_mail_to_address_error",
					new Object[] { address, e });
			throw new MailNotSentException("Cannot send mail", "sending_mail_to_address_error", e,
					new Object[] { address, e });
		}
	}

	public static void sendEmailWithException(String address, String subject, String content) throws MailNotSentException {
		sendEmailWithException(address, subject, content, null);
	}

	public static Session makeSession() {
		return mailFactory.makeSession();
	}
}