/*********************************************************************************************************************************
 * Autorskie Prawa Majątkowe - Moose Spółka z ograniczoną odpowiedzialnością
 *
 * Copyright 2017 Moose Spółka z ograniczoną odpowiedzialnością
 ********************************************************************************************************************************/

package eu.mooseinc.dell.form.service.impl;

import com.google.common.base.Preconditions;
import eu.mooseinc.dell.form.exception.ServiceException;
import eu.mooseinc.dell.form.model.Attachment;
import eu.mooseinc.dell.form.service.MailService;
import java.io.File;
import java.util.List;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

/**
 * Email Service implementation
 */
@Service
public class MailServiceImpl implements MailService {
	/**
	 * legger
	 */
	private static final Logger logger = LoggerFactory.getLogger(MailServiceImpl.class);
	/**
	 * codding standard for e-mail.
	 */
	private static final String ENCODING = "UTF-8";

	/**
	 * Email sender address
	 */
	@Value("${mail.from}")
	private String from;

	@Autowired
	@Qualifier("mailSender")
	private JavaMailSender mailSender;

	@Override
	public void send(String[] to, String subject, String text, List<Attachment> attachments) throws ServiceException {
		Preconditions.checkArgument(to != null && to.length > 0);
		Preconditions.checkArgument(StringUtils.isNotEmpty(subject));
		Preconditions.checkArgument(StringUtils.isNotEmpty(text));
		Preconditions.checkArgument(attachments != null);

		sendMail(to, null, subject, text, attachments);
	}

	@Override
	public void send(String[] to, String cc, String subject, String text, List<Attachment> attachments) throws ServiceException {
		Preconditions.checkArgument(to != null && to.length > 0);
		Preconditions.checkArgument(StringUtils.isNotEmpty(subject));
		Preconditions.checkArgument(StringUtils.isNotEmpty(text));

		sendMail(to, cc, subject, text, attachments);
	}

	/**
	 * Sending email message
	 *
	 * @param to message recipient
	 * @param cc meessage copy recipient
	 * @param subject message subject
	 * @param text message body
	 * @param attachments list of attachments
	 *
	 * @throws ServiceException when ther is a problem with sending email
	 */
	private void sendMail(String[] to, String cc, String subject, String text, List<Attachment> attachments)
			throws ServiceException {
		final MimeMessage message = mailSender.createMimeMessage();

		try {
			final MimeMessageHelper helper = new MimeMessageHelper(message, true, ENCODING);
			helper.setTo(to);
			helper.setFrom(from);
			helper.setSubject(subject);
			helper.setText(text, true);
			if (StringUtils.isNotEmpty(cc))
				helper.setCc(cc);

			if (attachments != null) {
				for (final Attachment attachment : attachments) {
					final File file = new File(attachment.getFilePath());
					helper.addAttachment(attachment.getFileName(), file);
				}
			}

		}
		catch (final MessagingException e) {
			logger.error("Wystąpił błąd podczas tworzenia wiadomości", e);
			throw new ServiceException("Wystąpił błąd podczas tworzenia wiadomości", e);
		}

		mailSender.send(message);
	}
}