/**

  * Copyright 2005-2011 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.api.namespace.Namespace;

 import org.kuali.rice.core.api.namespace.NamespaceService;

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

 import org.kuali.rice.kim.api.group.Group;

 import org.kuali.rice.kim.api.group.GroupService;

 import org.kuali.rice.kim.api.identity.IdentityService;

 import org.kuali.rice.kim.api.identity.principal.Principal;

 import org.kuali.rice.kim.api.services.KimApiServiceLocator;

 import org.kuali.rice.krad.service.KRADServiceLocatorInternal;

 import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

 import javax.servlet.http.HttpServletRequest;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * Base class for KEN controllers for sending notifications

  *

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

  *

  */

 public class BaseSendNotificationController extends MultiActionController {

     private static final Logger LOG = Logger.getLogger(BaseSendNotificationController.class);

     private static final String USER_RECIPS_PARAM = "userRecipients";

     private static final String WORKGROUP_RECIPS_PARAM = "workgroupRecipients";

     private static final String WORKGROUP_NAMESPACE_CODES_PARAM = "workgroupNamespaceCodes";

     private static final String SPLIT_REGEX = "(%2C|,)";

     private static IdentityService identityService;

     private static GroupService groupService;

     private static NamespaceService namespaceService;

     protected static IdentityService getIdentityService() {

         if ( identityService == null ) {

             identityService = KimApiServiceLocator.getIdentityService();

         }

         return identityService;

     }

     protected static GroupService getGroupService() {

         if ( groupService == null ) {

             groupService = KimApiServiceLocator.getGroupService();

         }

         return groupService;

     }

     protected static NamespaceService getNamespaceService() {

         if ( namespaceService == null ) {

             namespaceService = KRADServiceLocatorInternal.getNamespaceService();

         }

         return namespaceService;

     }

     protected String[] parseUserRecipients(HttpServletRequest request) {

         return parseCommaSeparatedValues(request, USER_RECIPS_PARAM);

     }

     protected String[] parseWorkgroupRecipients(HttpServletRequest request) {

         return parseCommaSeparatedValues(request, WORKGROUP_RECIPS_PARAM);

     }

     protected String[] parseWorkgroupNamespaceCodes(HttpServletRequest request) {

             return parseCommaSeparatedValues(request, WORKGROUP_NAMESPACE_CODES_PARAM);

     }

     protected String[] parseCommaSeparatedValues(HttpServletRequest request, String param) {

         String vals = request.getParameter(param);

         if (vals != null) {

             String[] split = vals.split(SPLIT_REGEX);

             List<String> strs = new ArrayList<String>();

             for (String component: split) {

                 if (StringUtils.isNotBlank(component)) {

                     strs.add(component.trim());

                 }

             }

             return strs.toArray(new String[strs.size()]);

         } else {

             return new String[0];

         }

     }

     protected boolean isUserRecipientValid(String user, ErrorList errors) {

         boolean valid = true;

         Principal principal = getIdentityService().getPrincipalByPrincipalName(user);

         if (principal == null) {

                 valid = false;

                 errors.addError("'" + user + "' is not a valid principal name");

         }

         return valid;

     }

     protected boolean isWorkgroupRecipientValid(String groupName, String namespaceCode, ErrorList errors) {

             Namespace nSpace = getNamespaceService().getNamespace(namespaceCode);

             if (nSpace == null) {

                     errors.addError((new StringBuilder()).append('\'').append(namespaceCode).append("' is not a valid namespace code").toString());

                     return false;

             } else {

                     Group i = getGroupService().getGroupByNameAndNamespaceCode(namespaceCode, groupName);

                        if (i == null) {

                                errors.addError((new StringBuilder()).append('\'').append(groupName).append(

                                                "' is not a valid group name for namespace code '").append(namespaceCode).append('\'').toString());

                                return false;

                        } else {

                                return true;

                        }

             }

     }

 }