/*

  * Copyright 2007-2008 The Kuali Foundation

  * 

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  * 

  * http://www.opensource.org/licenses/ecl2.php

  * 

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kcb.service.impl;

 import javax.mail.internet.AddressException;

 import javax.mail.internet.InternetAddress;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 import org.kuali.rice.kcb.bo.Message;

 import org.kuali.rice.kcb.bo.MessageDelivery;

 import org.kuali.rice.kcb.service.EmailService;

 import org.kuali.rice.ken.util.NotificationConstants;

 import org.kuali.rice.kew.mail.EmailBody;

 import org.kuali.rice.kew.mail.EmailFrom;

 import org.kuali.rice.kew.mail.EmailSubject;

 import org.kuali.rice.kew.mail.EmailTo;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.springframework.beans.factory.annotation.Required;

 /**

  * This class is responsible for implementing the service that sends emails to individuals.

  * @author Kuali Rice Team (rice.collab@kuali.org)

  * @auther Aaron Godert (ag266 at cornell dot edu)

  */

 public class EmailServiceImpl implements EmailService {

         private static Logger LOG = Logger.getLogger(EmailServiceImpl.class);

         private static final String FORMAT_TEXT_HTML = "text/html";

         private static final String FORMAT_TEXT_PLAIN = "text/plain";

     // values injected into these from Spring

     private String weburl;

     private String defaultSender = "kcb@localhost";

     private final String DETAILACTION = "DetailView.form";

     /**

      * Sets the weburl attribute value (injected from Spring).

      * @param weburl

      */

     @Required

     public void setWeburl(String weburl) {

         this.weburl = weburl;

     }

     /**

      * Sets the default sender address to use if no valid producer email address

      * was specified in the message

      * @param defaultSender the default sender address to use if no valid producer email address was specified in the message

      */

     public void setDefaultSender(String defaultSender) {

         this.defaultSender = defaultSender;

     }

     /**

      * First constructs the appropriately formatted mail message then sends it off.

      * @see org.kuali.rice.kcb.service.EmailService#sendNotificationEmail(org.kuali.rice.kcb.bo.MessageDelivery, java.lang.String, java.lang.String)

      */

     public Long sendEmail(MessageDelivery messageDelivery, String recipientEmailAddress, String emailFormat) throws Exception {

         // reconcile the need for custom rendering depending on message producer

         // or can we just have a single URL that redirects to original dochandler?

         Message message = messageDelivery.getMessage();

         String channelName = message.getChannel();

         String producer = message.getProducer();

         String sender = defaultSender;

         if (producer != null) {

             try {

                 InternetAddress[] addresses = InternetAddress.parse(producer, false);

                 if (addresses.length > 0) {

                     sender = addresses[0].toString();

                 }

             } catch (AddressException ae) {

                 // not a valid email address

             }

         }

         String title = messageDelivery.getMessage().getTitle();

         String subject = (channelName == null ? "" : channelName + " ") + (!StringUtils.isBlank(title) ? " - " + title : "");

         String format = FORMAT_TEXT_PLAIN;

         String linebreak = "\n\n";

         // NOTE: we don't set the docId parameter in the link

         // This forces the detail view to not render an acknowledge

         // button

         String link = weburl +"/"+ DETAILACTION +"?" 

         + NotificationConstants.NOTIFICATION_CONTROLLER_CONSTANTS.MSG_DELIVERY_ID +"="+ messageDelivery.getId();

         if (emailFormat == null || emailFormat.equals("text")) {

                 // defaults values are good for text

         } else {  // html format

             format = FORMAT_TEXT_HTML;

             link = "<a href='"+ link +"'>Notification Detail</a>";

             linebreak = "<br /><br />";

         }

         LOG.debug("link: "+link);

         // construct the message

         StringBuffer sb = new StringBuffer();

         sb.append("You have a new notification. Click the link below to review its details.");

         sb.append(linebreak);

         sb.append(linebreak);

         sb.append(link);

         String content = sb.toString();

         LOG.debug("subject: "+subject);

         LOG.debug("sender: "+sender);

         LOG.debug("recipient: "+recipientEmailAddress);

         LOG.debug("content: "+content);

         // actually do the send

         sendEmail(content, subject, sender, recipientEmailAddress, format);

         return null;

     }

     /**

      * do the actual sending.  Uses the KEW's configured EmailService by default. 

      * @param message message content

      * @param subject subject of message

      * @param from sender of message

      * @param sendTo recipient of message

      * @param format text or html 

      */

     protected void sendEmail(String message, String subject, String from, String sendTo, String format) {

             KEWServiceLocator.getEmailService().sendEmail(

                             new EmailFrom(from), 

                             new EmailTo(sendTo), 

                             new EmailSubject(subject), 

                             new EmailBody(message), 

                             !FORMAT_TEXT_PLAIN.equals(format));

     }

 }