/*

  * Copyright 2006-2011 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.ken.web.spring;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.framework.persistence.dao.GenericDao;

 import org.kuali.rice.ken.bo.Notification;

 import org.kuali.rice.ken.bo.NotificationChannel;

 import org.kuali.rice.ken.bo.NotificationChannelReviewer;

 import org.kuali.rice.ken.bo.NotificationContentType;

 import org.kuali.rice.ken.bo.NotificationPriority;

 import org.kuali.rice.ken.bo.NotificationProducer;

 import org.kuali.rice.ken.bo.NotificationRecipient;

 import org.kuali.rice.ken.bo.NotificationSender;

 import org.kuali.rice.ken.document.kew.NotificationWorkflowDocument;

 import org.kuali.rice.ken.exception.ErrorList;

 import org.kuali.rice.ken.service.NotificationChannelService;

 import org.kuali.rice.ken.service.NotificationMessageContentService;

 import org.kuali.rice.ken.service.NotificationRecipientService;

 import org.kuali.rice.ken.service.NotificationService;

 import org.kuali.rice.ken.service.NotificationWorkflowDocumentService;

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

 import org.kuali.rice.ken.util.Util;

 import org.kuali.rice.kew.dto.WorkflowIdDTO;

 import org.kuali.rice.kew.rule.GenericAttributeContent;

 import org.kuali.rice.kim.util.KimConstants.KimGroupMemberTypes;

 import org.springframework.web.servlet.ModelAndView;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import java.io.IOException;

 import java.sql.Timestamp;

 import java.text.ParseException;

 import java.util.Date;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 /**

  * This class is the controller for sending Event notification messages via an end user interface.

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

  */

 public class SendEventNotificationMessageController extends BaseSendNotificationController {

     /** Logger for this class and subclasses */

     private static final Logger LOG = Logger

             .getLogger(SendEventNotificationMessageController.class);

     private static final String NONE_CHANNEL = "___NONE___";

     private static final long REASONABLE_IMMEDIATE_TIME_THRESHOLD = 1000 * 60 * 5; // <= 5 minutes is "immediate"

     /**

      * Returns whether the specified time is considered "in the future", based on some reasonable threshold

      * @param time the time to test

      * @return whether the specified time is considered "in the future", based on some reasonable threshold

      */

     private boolean timeIsInTheFuture(long time) {

         boolean future = (time - System.currentTimeMillis()) > REASONABLE_IMMEDIATE_TIME_THRESHOLD;

         LOG.info("Time: " + new Date(time) + " is in the future? " + future);

         return future;

     }

     /**

      * Returns whether the specified Notification can be reasonably expected to have recipients.

      * This is determined on whether the channel has default recipients, is subscribably, and whether

      * the send date time is far enough in the future to expect that if there are no subscribers, there

      * may actually be some by the time the notification is sent.

      * @param notification the notification to test

      * @return whether the specified Notification can be reasonably expected to have recipients

      */

     private boolean hasPotentialRecipients(Notification notification) {

         LOG.info("notification channel " + notification.getChannel() + " is subscribable: " + notification.getChannel().isSubscribable());

         return notification.getChannel().getRecipientLists().size() > 0 ||

                notification.getChannel().getSubscriptions().size() > 0 ||

                (notification.getChannel().isSubscribable() && timeIsInTheFuture(notification.getSendDateTime().getTime()));

     }

     protected NotificationService notificationService;

     protected NotificationWorkflowDocumentService notificationWorkflowDocService;

     protected NotificationChannelService notificationChannelService;

     protected NotificationRecipientService notificationRecipientService;

     protected NotificationMessageContentService messageContentService;

     protected GenericDao businessObjectDao;

     /**

      * Set the NotificationService

      * @param notificationService

      */

     public void setNotificationService(NotificationService notificationService) {

         this.notificationService = notificationService;

     }

     /**

      * This method sets the NotificationWorkflowDocumentService

      * @param s

      */

     public void setNotificationWorkflowDocumentService(

             NotificationWorkflowDocumentService s) {

         this.notificationWorkflowDocService = s;

     }

     /**

      * Sets the notificationChannelService attribute value.

      * @param notificationChannelService The notificationChannelService to set.

      */

     public void setNotificationChannelService(

             NotificationChannelService notificationChannelService) {

         this.notificationChannelService = notificationChannelService;

     }

     /**

      * Sets the notificationRecipientService attribute value.

      * @param notificationRecipientService

      */

     public void setNotificationRecipientService(

             NotificationRecipientService notificationRecipientService) {

         this.notificationRecipientService = notificationRecipientService;

     }

     /**

      * Sets the messageContentService attribute value.

      * @param messageContentService

      */

     public void setMessageContentService(

             NotificationMessageContentService notificationMessageContentService) {

         this.messageContentService = notificationMessageContentService;

     }

     /**

      * Sets the businessObjectDao attribute value.

      * @param businessObjectDao The businessObjectDao to set.

      */

     public void setBusinessObjectDao(GenericDao businessObjectDao) {

         this.businessObjectDao = businessObjectDao;

     }

     /**

      * Handles the display of the form for sending an event notification message

      * @param request : a servlet request

      * @param response : a servlet response

      * @throws ServletException : an exception

      * @throws IOException : an exception

      * @return a ModelAndView object

      */

     public ModelAndView sendEventNotificationMessage(

             HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         String view = "SendEventNotificationMessage";

         LOG.debug("remoteUser: " + request.getRemoteUser());

         Map<String, Object> model = setupModelForSendEventNotification(request);

         model.put("errors", new ErrorList()); // need an empty one so we don't have an NPE

         return new ModelAndView(view, model);

     }

     /**

      * This method prepares the model used for the send event notification message form.

      * @param request

      * @return Map<String, Object>

      */

     private Map<String, Object> setupModelForSendEventNotification(

             HttpServletRequest request) {

         Map<String, Object> model = new HashMap<String, Object>();

         model.put("defaultSender", request.getRemoteUser());

         model.put("channels", notificationChannelService

                 .getAllNotificationChannels());

         model.put("priorities", businessObjectDao

                 .findAll(NotificationPriority.class));

         // set sendDateTime to current datetime if not provided

         String sendDateTime = request.getParameter("sendDateTime");

         String currentDateTime = Util.getCurrentDateTime();

         if (StringUtils.isEmpty(sendDateTime)) {

             sendDateTime = currentDateTime;

         }

         model.put("sendDateTime", sendDateTime);

         // retain the original date time or set to current if

         // it was not in the request

         if (request.getParameter("originalDateTime") == null) {

            model.put("originalDateTime", currentDateTime);

         } else {

            model.put("originalDateTime", request.getParameter("originalDateTime"));

         }

         model.put("summary", request.getParameter("summary"));

         model.put("description", request.getParameter("description"));

         model.put("location", request.getParameter("location"));

         model.put("startDateTime", request.getParameter("startDateTime"));

         model.put("stopDateTime", request.getParameter("stopDateTime"));

         model.put("userRecipients", request.getParameter("userRecipients"));

         model.put("workgroupRecipients", request.getParameter("workgroupRecipients"));

         model.put("workgroupNamespaceCodes", request.getParameter("workgroupNamespaceCodes"));

         return model;

     }

     /**

      * This method handles submitting the actual event notification message.

      * @param request

      * @param response

      * @return ModelAndView

      * @throws ServletException

      * @throws IOException

      */

     public ModelAndView submitEventNotificationMessage(

             HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         LOG.debug("remoteUser: " + request.getRemoteUser());

         // obtain a workflow user object first

         WorkflowIdDTO initiator = new WorkflowIdDTO(request.getRemoteUser());

         // now construct the workflow document, which will interact with workflow

         NotificationWorkflowDocument document;

         Map<String, Object> model = new HashMap<String, Object>();

         String view;

         try {

             document = new NotificationWorkflowDocument(

                     initiator,

                     NotificationConstants.KEW_CONSTANTS.SEND_NOTIFICATION_REQ_DOC_TYPE);

             //parse out the application content into a Notification BO

             Notification notification = populateNotificationInstance(request, model);

             // now get that content in an understandable XML format and pass into document

             String notificationAsXml = messageContentService

                     .generateNotificationMessage(notification);

             Map<String, String> attrFields = new HashMap<String,String>();

             List<NotificationChannelReviewer> reviewers = notification.getChannel().getReviewers();

             int ui = 0;

             int gi = 0;

             for (NotificationChannelReviewer reviewer: reviewers) {

                 String prefix;

                 int index;

                 if (KimGroupMemberTypes.PRINCIPAL_MEMBER_TYPE.equals(reviewer.getReviewerType())) {

                     prefix = "user";

                     index = ui;

                     ui++;

                 } else if (KimGroupMemberTypes.GROUP_MEMBER_TYPE.equals(reviewer.getReviewerType())) {

                     prefix = "group";

                     index = gi;

                     gi++;

                 } else {

                     LOG.error("Invalid type for reviewer " + reviewer.getReviewerId() + ": " + reviewer.getReviewerType());

                     continue;

                 }

                 attrFields.put(prefix + index, reviewer.getReviewerId());

             }

             GenericAttributeContent gac = new GenericAttributeContent("channelReviewers");

             document.getDocumentContent().setApplicationContent(notificationAsXml);

             document.getDocumentContent().setAttributeContent("<attributeContent>" + gac.generateContent(attrFields) + "</attributeContent>");

             document.setTitle(notification.getTitle());

             document.routeDocument("This message was submitted via the event notification message submission form by user "

                             + initiator.getWorkflowId());

             view = "SendEventNotificationMessage";

             // This ain't pretty, but it gets the job done for now.

             ErrorList el = new ErrorList();

             el.addError("Notification(s) sent.");

             model.put("errors", el);

         } catch (ErrorList el) {

             // route back to the send form again

             Map<String, Object> model2 = setupModelForSendEventNotification(request);

             model.putAll(model2);

             model.put("errors", el);

             view = "SendEventNotificationMessage";

         } catch (Exception e) {

             throw new RuntimeException(e);

         }

         return new ModelAndView(view, model);

     }

     /**

      * This method creates a new Notification instance from the event form values.

      * @param request

      * @param model

      * @return Notification

      * @throws IllegalArgumentException

      */

     private Notification populateNotificationInstance(

             HttpServletRequest request, Map<String, Object> model)

             throws IllegalArgumentException, ErrorList {

         ErrorList errors = new ErrorList();

         Notification notification = new Notification();

         // grab data from form

         // channel name

         String channelName = request.getParameter("channelName");

         if (StringUtils.isEmpty(channelName) || StringUtils.equals(channelName, NONE_CHANNEL)) {

             errors.addError("You must choose a channel.");

         } else {

             model.put("channelName", channelName);

         }

         // priority name

         String priorityName = request.getParameter("priorityName");

         if (StringUtils.isEmpty(priorityName)) {

             errors.addError("You must choose a priority.");

         } else {

             model.put("priorityName", priorityName);

         }

         // sender names

         String senderNames = request.getParameter("senderNames");

         String[] senders = null;

         if (StringUtils.isEmpty(senderNames)) {

             errors.addError("You must enter at least one sender.");

         } else {

             senders = StringUtils.split(senderNames, ",");

             model.put("senderNames", senderNames);

         }

         // delivery type

         String deliveryType = request.getParameter("deliveryType");

         if (StringUtils.isEmpty(deliveryType)) {

             errors.addError("You must choose a type.");

         } else {

             if (deliveryType

                     .equalsIgnoreCase(NotificationConstants.DELIVERY_TYPES.FYI)) {

                 deliveryType = NotificationConstants.DELIVERY_TYPES.FYI;

             } else {

                 deliveryType = NotificationConstants.DELIVERY_TYPES.ACK;

             }

             model.put("deliveryType", deliveryType);

         }

         //get datetime when form was initially rendered

         String originalDateTime = request.getParameter("originalDateTime");

         Date origdate = null;

         Date senddate = null;

         Date removedate = null;

         try {

             origdate = Util.parseUIDateTime(originalDateTime);

         } catch (ParseException pe) {

             errors.addError("Original date is invalid.");

         }

         // send date time

         String sendDateTime = request.getParameter("sendDateTime");

         if (StringUtils.isBlank(sendDateTime)) {

             sendDateTime = Util.getCurrentDateTime();

         }

         try {

             senddate = Util.parseUIDateTime(sendDateTime);

         } catch (ParseException pe) {

             errors.addError("You specified an invalid Send Date/Time.  Please use the calendar picker.");

         }

         if(senddate != null && senddate.before(origdate)) {

             errors.addError("Send Date/Time cannot be in the past.");

         }

         model.put("sendDateTime", sendDateTime);

         // auto remove date time

         String autoRemoveDateTime = request.getParameter("autoRemoveDateTime");

         if (StringUtils.isNotBlank(autoRemoveDateTime)) {

             try {

                 removedate = Util.parseUIDateTime(autoRemoveDateTime);

             } catch (ParseException pe) {

                 errors.addError("You specified an invalid Auto-Remove Date/Time.  Please use the calendar picker.");

             }

             if(removedate != null) {

                 if(removedate.before(origdate)) {

                     errors.addError("Auto-Remove Date/Time cannot be in the past.");

                 } else if (senddate != null && removedate.before(senddate)){

                     errors.addError("Auto-Remove Date/Time cannot be before the Send Date/Time.");

                 }

             }

         }

         model.put("autoRemoveDateTime", autoRemoveDateTime);

         // user recipient names

         String[] userRecipients = parseUserRecipients(request);

         // workgroup recipient names

         String[] workgroupRecipients = parseWorkgroupRecipients(request);

         // workgroup namespace names

         String[] workgroupNamespaceCodes = parseWorkgroupNamespaceCodes(request);

         // title

         String title = request.getParameter("title");

         if (!StringUtils.isEmpty(title)) {

             model.put("title", title);

         } else {

             errors.addError("You must fill in a title");

         }

         // message

         String message = request.getParameter("message");

         if (StringUtils.isEmpty(message)) {

             errors.addError("You must fill in a message.");

         } else {

             model.put("message", message);

         }

         // all event fields are mandatory for event type

         // start date time

         String startDateTime = request.getParameter("startDateTime");

         if (StringUtils.isEmpty(startDateTime)) {

             errors.addError("You must fill in a start date/time.");

         } else {

             model.put("startDateTime", startDateTime);

         }

         // stop date time

         String stopDateTime = request.getParameter("stopDateTime");

         if (StringUtils.isEmpty(stopDateTime)) {

             errors.addError("You must fill in a stop date/time.");

         } else {

             model.put("stopDateTime", stopDateTime);

         }

         // summary

         String summary = request.getParameter("summary");

         if (StringUtils.isEmpty(summary)) {

             errors.addError("You must fill in a summary.");

         } else {

             model.put("summary", summary);

         }

         // description

         String description = request.getParameter("description");

         if (StringUtils.isEmpty(description)) {

             errors.addError("You must fill in a description.");

         } else {

             model.put("description", description);

         }

         // location

         String location = request.getParameter("location");

         if (StringUtils.isEmpty(location)) {

             errors.addError("You must fill in a location.");

         } else {

             model.put("location", location);

         }

         // stop processing if there are errors

         if (errors.getErrors().size() > 0) {

             throw errors;

         }

         // now populate the notification BO instance

         NotificationChannel channel = Util.retrieveFieldReference("channel",

                 "name", channelName, NotificationChannel.class,

                 businessObjectDao);

         notification.setChannel(channel);

         NotificationPriority priority = Util.retrieveFieldReference("priority",

                 "name", priorityName, NotificationPriority.class,

                 businessObjectDao);

         notification.setPriority(priority);

         NotificationContentType contentType = Util.retrieveFieldReference(

                 "contentType", "name",

                 NotificationConstants.CONTENT_TYPES.EVENT_CONTENT_TYPE,

                 NotificationContentType.class, businessObjectDao);

         notification.setContentType(contentType);

         NotificationProducer producer = Util

                 .retrieveFieldReference(

                         "producer",

                         "name",

                         NotificationConstants.KEW_CONSTANTS.NOTIFICATION_SYSTEM_USER_NAME,

                         NotificationProducer.class, businessObjectDao);

         notification.setProducer(producer);

         for (String senderName : senders) {

             if (StringUtils.isEmpty(senderName)) {

                 errors.addError("A sender's name cannot be blank.");

             } else {

                 NotificationSender ns = new NotificationSender();

                 ns.setSenderName(senderName.trim());

                 notification.addSender(ns);

             }

         }

         boolean recipientsExist = false;

         if (userRecipients != null && userRecipients.length > 0) {

             recipientsExist = true;

             for (String userRecipientId : userRecipients) {

                 if (isUserRecipientValid(userRecipientId, errors)) {

                         NotificationRecipient recipient = new NotificationRecipient();

                         recipient.setRecipientType(KimGroupMemberTypes.PRINCIPAL_MEMBER_TYPE);

                         recipient.setRecipientId(userRecipientId);

                         notification.addRecipient(recipient);

                 }

             }

         }

         if (workgroupRecipients != null && workgroupRecipients.length > 0) {

             recipientsExist = true;

             if (workgroupNamespaceCodes != null && workgroupNamespaceCodes.length > 0) {

                     if (workgroupNamespaceCodes.length == workgroupRecipients.length) {

                             for (int i = 0; i < workgroupRecipients.length; i++) {

                                     if (isWorkgroupRecipientValid(workgroupRecipients[i], workgroupNamespaceCodes[i], errors)) {

                                             NotificationRecipient recipient = new NotificationRecipient();

                                             recipient.setRecipientType(KimGroupMemberTypes.GROUP_MEMBER_TYPE);

                                             recipient.setRecipientId(

                                                             getIdentityManagementService().getGroupByName(workgroupNamespaceCodes[i], workgroupRecipients[i]).getGroupId());

                                             notification.addRecipient(recipient);

                                     }

                             }

                     } else {

                             errors.addError("The number of groups must match the number of namespace codes");

                     }

             } else {

                         errors.addError("You must specify a namespace code for every group name");

                 }

         } else if (workgroupNamespaceCodes != null && workgroupNamespaceCodes.length > 0) {

                 errors.addError("You must specify a group name for every namespace code");

         }

         // check to see if there were any errors

         if (errors.getErrors().size() > 0) {

             throw errors;

         }

         notification.setTitle(title);

         notification.setDeliveryType(deliveryType);

         Date startDate = null;

         Date stopDate = null;

         // simpledateformat is not threadsafe, have to sync and validate

         Date d = null;

         if (StringUtils.isNotBlank(sendDateTime)) {

             try {

                 d = Util.parseUIDateTime(sendDateTime);

             } catch (ParseException pe) {

                 errors.addError("You specified an invalid send date and time.  Please use the calendar picker.");

             }

             notification.setSendDateTime(new Timestamp(d.getTime()));

         }

         Date d2 = null;

         if (StringUtils.isNotBlank(autoRemoveDateTime)) {

             try {

                 d2 = Util.parseUIDateTime(autoRemoveDateTime);

                 if (d2.before(d)) {

                     errors.addError("Auto Remove Date/Time cannot be before Send Date/Time.");

                 }

             } catch (ParseException pe) {

                 errors.addError("You specified an invalid auto-remove date and time.  Please use the calendar picker.");

             }

             notification.setAutoRemoveDateTime(new Timestamp(d2.getTime()));

         }

         if (StringUtils.isNotBlank(startDateTime)) {

             try {

                 startDate = Util.parseUIDateTime(startDateTime);

             } catch (ParseException pe) {

                 errors.addError("You specified an invalid start date and time.  Please use the calendar picker.");

             }

         }

         if (StringUtils.isNotBlank(stopDateTime)) {

             try {

                 stopDate = Util.parseUIDateTime(stopDateTime);

             } catch (ParseException pe) {

                 errors.addError("You specified an invalid stop date and time.  Please use the calendar picker.");

             }

         }

         if(stopDate != null && startDate != null) {

             if (stopDate.before(startDate)) {

                 errors.addError("Event Stop Date/Time cannot be before Event Start Date/Time.");

             }

         }

         if (!recipientsExist && !hasPotentialRecipients(notification)) {

             errors.addError("You must specify at least one user or group recipient.");

         }

         // check to see if there were any errors

         if (errors.getErrors().size() > 0) {

             throw errors;

         }

         notification

                 .setContent(NotificationConstants.XML_MESSAGE_CONSTANTS.CONTENT_EVENT_OPEN

                         + NotificationConstants.XML_MESSAGE_CONSTANTS.MESSAGE_OPEN

                         + message

                         + NotificationConstants.XML_MESSAGE_CONSTANTS.MESSAGE_CLOSE

                         + "<event>\n"

                         + "  <summary>" + summary + "</summary>\n"

                         + "  <description>" + description + "</description>\n"

                         + "  <location>" + location + "</location>\n"

                         + "  <startDateTime>" + Util.toUIDateTimeString(startDate) + "</startDateTime>\n"

                         + "  <stopDateTime>" + Util.toUIDateTimeString(stopDate) + "</stopDateTime>\n"

                         + "</event>"

                         + NotificationConstants.XML_MESSAGE_CONSTANTS.CONTENT_CLOSE);

         return notification;

     }

 }