/**
    * Copyright 2004-2014 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.kpme.core.service.notification;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.log4j.Logger;
  import org.kuali.rice.core.api.config.property.ConfigContext;
  import org.kuali.rice.core.api.mail.EmailBody;
  import org.kuali.rice.core.api.mail.EmailFrom;
  import org.kuali.rice.core.api.mail.EmailSubject;
  import org.kuali.rice.core.api.mail.EmailTo;
  import org.kuali.rice.core.api.mail.Mailer;
  import org.kuali.rice.coreservice.framework.parameter.ParameterService;
  import org.kuali.rice.kew.api.KewApiConstants;
  import org.kuali.rice.kim.api.KimConstants;
  import org.kuali.rice.kim.api.identity.Person;
  import org.kuali.rice.kim.api.identity.PersonService;
  import org.kuali.rice.kim.api.identity.entity.EntityDefault;
  import org.kuali.rice.kim.api.identity.type.EntityTypeContactInfoDefault;
  import org.kuali.rice.kim.api.services.KimApiServiceLocator;
  import org.kuali.rice.krad.util.KRADConstants;
  
  public class KPMENotificationServiceImpl implements KPMENotificationService {
  	
  	private static final Logger LOG = Logger.getLogger(KPMENotificationServiceImpl.class);
  	
  	private static final String KPME_NOTIFICATIONS_ENABLED = "kpme.notifications.enabled";
      private static final String DEFAULT_EMAIL_FROM_ADDRESS = "admin@localhost";
  	
  	private Mailer mailer;
  	private ParameterService parameterService;
  	private PersonService personService;
  
  	@Override
  	public void sendNotification(String subject, String message, String... principalIds) {
  		if (sendEmailNotification()) {
  			for (String principalId : principalIds) {
                  EntityDefault entityDefault = KimApiServiceLocator.getIdentityService().getEntityDefaultByPrincipalId(principalId);
                  if (entityDefault != null) {
                      EntityTypeContactInfoDefault contact = entityDefault.getEntityType(KimConstants.EntityTypes.PERSON);
                      if (contact != null
                              && contact.getDefaultEmailAddress() != null
                              && contact.getDefaultEmailAddress().getEmailAddressUnmasked() != null) {
                          EmailFrom emailFrom = new EmailFrom(getApplicationEmailAddress());
                          EmailTo emailTo = new EmailTo(contact.getDefaultEmailAddress().getEmailAddressUnmasked());
                          EmailSubject emailSubject = new EmailSubject(subject);
                          EmailBody emailBody = new EmailBody(message);
  			        
  					try {
  						getMailer().sendEmail(emailFrom, emailTo, emailSubject, emailBody, false);
  					} catch (RuntimeException re) {
  						LOG.error("Email message sending failure:", re);
  					}
  				} else {
  						LOG.warn("Could not send message to principalId " + principalId + " because the person entity does not have an email address");
  					}
  				} else {
  				    LOG.warn("Could not send message to principalId " + principalId + " because the person entity does not exist");
  				}
  			}
  		} else {
  			LOG.info("Not sending message due to config parameter " + KPME_NOTIFICATIONS_ENABLED + " indicating emails should not be sent");
  		}
  	}
  	
      private boolean sendEmailNotification() {
          return ConfigContext.getCurrentContextConfig().getBooleanProperty(KPME_NOTIFICATIONS_ENABLED, false);
      }
  	
      private String getApplicationEmailAddress() {
          String fromAddress = getParameterService().getParameterValueAsString(KewApiConstants.KEW_NAMESPACE, KRADConstants.DetailTypes.MAILER_DETAIL_TYPE, 
          		KewApiConstants.EMAIL_REMINDER_FROM_ADDRESS);
          if (StringUtils.isEmpty(fromAddress)) {
              fromAddress = DEFAULT_EMAIL_FROM_ADDRESS;
          }
          return fromAddress;
      }
  
  	public Mailer getMailer() {
  		return mailer;
  	}
  
  	public void setMailer(Mailer mailer) {
  		this.mailer = mailer;
  	}
  
 	public ParameterService getParameterService() {
 		return parameterService;
 	}
 
 	public void setParameterService(ParameterService parameterService) {
 		this.parameterService = parameterService;
 	}
 
 }