package com.z0ltan.mail.exchange;

import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.URLDataSource;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class SendEmail {
    private static final int MAX_SMTP_SIZE = 5; // MB

    public static void main(String[] args) {
        String fromAddress = "user@address.com";
        String smtpAddress = "10.0.45.1";
        int smtpPort = 25;

        String attachmentLink
            = "http://localhost:9999/examples/servlets/ultimate.pdf";
        String[] toAddress = { "timmy.jose@hp.com", "zoltan.jose@gmail.com" };
        String subject = "Report file and link";

        // First create the Properties object and use it to obtain the Session
        // object
        Properties props = new Properties();
        props.put("mail.smtp.host", smtpAddress);
        props.put("mail.smtp.port", smtpPort);
        // props.put("mail.smtp.auth", true);

        Session session = Session.getInstance(props, null);
        session.setDebug(true);

        // Create the Message
        final MimeMessage reportMessage = new MimeMessage(session);
        if (subject != null) {
            try {
                reportMessage.setSubject(subject, "UTF-8");
            } catch (MessagingException e) {
                e.printStackTrace();
            }
        }

        // Create the addresses and add to message body
        try {
            Address from = new InternetAddress(fromAddress);
            reportMessage.setFrom(from);

            Address[] to = new InternetAddress[toAddress.length];

            for (int i = 0; i < toAddress.length; i++) {
                to[i] = new InternetAddress(toAddress[i]);
            }

            reportMessage.addRecipients(Message.RecipientType.TO, to);

            // Add the attachment and the attachment link to the e-mail body
            BodyPart messageBodyPart = new MimeBodyPart();
            BodyPart attachBodyPart = null;

            Multipart multipart = new MimeMultipart();

            if (isAttachmentSmallerThanMaxSmtpSize(attachmentLink)) {
                attachBodyPart = new MimeBodyPart();
                DataSource source
                    = new URLDataSource(new URL(attachmentLink));
                attachBodyPart.setDataHandler(new DataHandler(source));
                String file = attachmentLink.substring(attachmentLink
                        .lastIndexOf('/'));
                attachBodyPart.setFileName(file);
                multipart.addBodyPart(attachBodyPart);
                messageBodyPart.setContent(attachmentLink,
                        "text/plain;charset=UTF-8");
            } else {
                String messageAndAttachment = "Note: The report file: "
                    + attachmentLink.substring(attachmentLink
                            .lastIndexOf('/') + 1)
                    + " was not attached since it exceeds the user "
                                        + "configured Maximum SMTP Attachment size."
                        + "\n\n" + attachmentLink;
                messageBodyPart.setContent(messageAndAttachment,
                        "text/plain;charset=UTF-8");
            }

            multipart.addBodyPart(messageBodyPart);

            reportMessage.setContent(multipart);
            reportMessage.saveChanges();

            // Send the e-mail
            (new Thread() {
                public void run() {
                    try {
                        Transport.send(reportMessage);
                    } catch (MessagingException e) {
                        e.printStackTrace();
                    }
                }
            }).start();

        } catch (AddressException e) {
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
    }

    private static boolean isAttachmentSmallerThanMaxSmtpSize(
            String attachmentLink) {
        boolean status = false;

        try {
            HttpURLConnection connection = (HttpURLConnection) new URL(
                    attachmentLink).openConnection();
            int sizeInMB = connection.getContentLength() / (1024 * 1024);

            if (sizeInMB > MAX_SMTP_SIZE) {
                status = false;
            } else {
                status = true;
            }

        } catch (Exception ex) {
            status = false;
        }

        return status;
    }
}