/*
 * This is eMonocot, a global online biodiversity information resource.
 *
 * Copyright © 2011–2015 The Board of Trustees of the Royal Botanic Gardens, Kew and The University of Oxford
 *
 * eMonocot 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.
 *
 * eMonocot 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.
 *
 * The complete text of the GNU Affero General Public License is in the source repository as the file
 * ‘COPYING’.  It is also available from <http://www.gnu.org/licenses/>.
 */
package org.emonocot.service.impl;

import java.util.Map;
import java.util.regex.Pattern;

import javax.mail.internet.MimeMessage;

import org.apache.velocity.app.VelocityEngine;
import org.emonocot.service.EmailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.mail.javamail.MimeMessagePreparator;
import org.springframework.ui.velocity.VelocityEngineUtils;

public class EmailServiceImpl implements EmailService {

	/**
	 * Email addresses are expected to be separated by commas, semi-colons, spaces or any combination thereof
	 */
	protected static final Pattern ADDRESS_DELIMITERS = Pattern.compile("(,|;| )+");

	private JavaMailSender mailSender;

	private VelocityEngine velocityEngine;

	private String fromAddress;

	@Autowired
	public void setMailSender(JavaMailSender mailSender) {
		this.mailSender = mailSender;
	}

	@Autowired
	public void setVelocityEngine(VelocityEngine velocityEngine) {
		this.velocityEngine = velocityEngine;
	}

	public void setFromAddress(String fromAddress) {
		this.fromAddress = fromAddress;
	}

	@Override
	public void sendEmail(final String templateName, final Map model, final String toAddress, final String subject) {
		sendEmail(templateName, model, ADDRESS_DELIMITERS.split(toAddress), subject);
	}

	public void sendEmail(final String templateName, final Map model, final String[] toAddresses, final String subject) {
		MimeMessagePreparator preparator = new MimeMessagePreparator() {
			public void prepare(MimeMessage mimeMessage) throws Exception {
				MimeMessageHelper message = new MimeMessageHelper(mimeMessage);
				message.setTo(toAddresses);
				message.setFrom(fromAddress);
				message.setSubject(subject);
				String text = VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, templateName, model);
				message.setText(text, true);
			}
		};
		this.mailSender.send(preparator);
	}

}