/*
 * Created on 07-Dec-2005 by Dave S-B
 *
 * CVS Revision : $Revision$
 * Last Updated : $Date$
 * Updated By : $Author$
 */
package com.lledrsolutions.jspwiki.plugin;

import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

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;

import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.plugin.PluginException;
import com.ecyrd.jspwiki.plugin.WikiPlugin;

/**
 * The FormMailerPlugin is designed to be used with WikiForms. It just creates a
 * simple email based on the form fields. You need to set up the SMTP server in
 * the jspwiki.properties file by adding;<br>
 * jspwiki.formMailer.smtpHost = [host_name].
 * 
 * @author Dave S-B
 */
public class FormMailerPlugin implements WikiPlugin
{

    public String execute(WikiContext context, Map params) throws PluginException
    {
        // Check for submit
        if (!params.containsKey("submit"))
        {
            return "";
        }
        // Construct message
        StringBuffer message = new StringBuffer();
        Iterator iter = params.keySet().iterator();
        while (iter.hasNext())
        {
            String key = (String) iter.next();
            if (!key.startsWith("mailer") && !key.equals("_body") && !key.equals("submit"))
            {
                message.append(key).append(";").append(System.getProperty("line.separator")).append(params.get(key).toString())
                    .append(System.getProperty("line.separator")).append(System.getProperty("line.separator"));
            }
        }
        // Send it
        String from = safeParam(params, "mailerFrom");
        String to = safeParam(params, "mailerTo");
        String cc = safeParam(params, "mailerCC");
        String bcc = safeParam(params, "mailerBCC");
        String subject = safeParam(params, "mailerSubject");
        String host = context.getEngine().getVariable(context, "jspwiki.formMailer.smtpHost").toString();
        try
        {
            this.send(from, to, cc, bcc, subject, message.toString(), host);
        }
        catch (AddressException e)
        {
            throw new PluginException("Mail Address Error", e);
        }
        catch (MessagingException e)
        {
            throw new PluginException("Messaging Error", e);
        }
        // Return empty string
        return "";
    }

    /**
     * Get a param from the Map - or an empty string if the parameter doesn't
     * exist
     * 
     * @param params
     * @param param
     * @return
     */
    private String safeParam(Map params, String param)
    {
        return params.containsKey(param) ? params.get(param).toString() : "";
    }

    /**
     * Attempts to send an email
     * 
     * @param from
     * @param to
     * @param cc
     * @param bcc
     * @param subject
     * @param message
     * @param smtpServer
     * @throws AddressException
     * @throws MessagingException
     */
    private void send(String from, String to, String cc, String bcc, String subject, String message, String smtpServer)
                                                                                                                       throws AddressException,
                                                                                                                           MessagingException
    {
        // Gets the System properties
        Properties props = System.getProperties();

        // Puts the SMTP server name to properties object
        props.put("mail.smtp.host", smtpServer);

        // Get the default Session using Properties Object
        Session session = Session.getDefaultInstance(props, null);
        session.setDebug(true);

        // Construct the message
        MimeMessage mailMessage = new MimeMessage(session);
        mailMessage.setFrom(new InternetAddress(from));
        mailMessage.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
        mailMessage.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc == null ? "" : cc, false));
        mailMessage.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(bcc == null ? "" : cc, false));
        mailMessage.setSubject(subject);
        // Create and fill the first message part
        MimeBodyPart mimeBodyPart = new MimeBodyPart();
        mimeBodyPart.setText(message);
        // Create the Multipart and its parts to it
        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(mimeBodyPart);
        // Add the Multipart to the message
        mailMessage.setContent(multipart);
        // Set the Date: header
        mailMessage.setSentDate(new Date());
        // Send the message
        Transport.send(mailMessage);
    }
}