package hiasm.hiasmproject;

import android.os.Handler;
import android.os.HandlerThread;

import java.io.File;
import java.util.List;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class SmtpMailer {

    public static class Params {

        private String username;
        private String password;
        private String host;
        private int port;
        private String recipientAddress;
        private String subject;
        private String text;
        private List<String> attachmentFileNames;

        public String getUsername() {
            return username;
        }

        public void setUsername(String username) {
            this.username = username;
        }

        public String getPassword() {
            return password;
        }

        public void setPassword(String password) {
            this.password = password;
        }

        public String getHost() {
            return host;
        }

        public void setHost(String host) {
            this.host = host;
        }

        public int getPort() {
            return port;
        }

        public void setPort(int port) {
            this.port = port;
        }

        public String getRecipientAddress() {
            return recipientAddress;
        }

        public void setRecipientAddress(String recipientAddress) {
            this.recipientAddress = recipientAddress;
        }

        public String getSubject() {
            return subject;
        }

        public void setSubject(String subject) {
            this.subject = subject;
        }

        public String getText() {
            return text;
        }

        public void setText(String text) {
            this.text = text;
        }

        public List<String> getAttachmentFileNames() {
            return attachmentFileNames;
        }

        public void setAttachmentFileNames(List<String> attachmentFileNames) {
            this.attachmentFileNames = attachmentFileNames;
        }
    }

    public static void sendMail(final Params params) {
        HandlerThread handlerThread = new HandlerThread("SmtpMailerHandlerThread");
        handlerThread.start();
        Handler handler = new Handler(handlerThread.getLooper());
        handler.post(new Runnable() {
            @Override
            public void run() {
                try {
                    Properties props = new Properties();
                    props.put("mail.smtp.auth", "true");
                    props.put("mail.smtp.starttls.enable", "true");
                    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
                    props.put("mail.smtp.host", params.getHost());
                    props.put("mail.smtp.port", params.getPort());
                    props.put("mail.smtp.socketFactory.port", params.getPort());

                    Authenticator authenticator = new javax.mail.Authenticator() {
                        protected PasswordAuthentication getPasswordAuthentication() {
                            return new PasswordAuthentication(params.getUsername(), params.getPassword());
                        }
                    };
                    Session session = Session.getInstance(props, authenticator);

                    Message message = new MimeMessage(session);
                    message.setFrom(new InternetAddress(params.getUsername()));
                    message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(params.getRecipientAddress()));
                    message.setSubject(params.getSubject());
                    message.setText(params.getText());

                    if (params.getAttachmentFileNames() != null && params.getAttachmentFileNames().size() > 0) {
                        addAttachments(message, params);
                    }

                    Transport.send(message);
                } catch(Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    private static void addAttachments(Message message, Params params) throws MessagingException {
        Multipart multipart = new MimeMultipart();
        for (String filePath : params.getAttachmentFileNames()) {
            MimeBodyPart messageBodyPart = new MimeBodyPart();
            messageBodyPart.setDataHandler(new DataHandler(new FileDataSource(filePath)));
            messageBodyPart.setFileName(new File(filePath).getName());
            multipart.addBodyPart(messageBodyPart);
        }
        message.setContent(multipart);
    }

}