/**
    * Copyright 2005-2014 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.rice.krad.uif.util;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.config.property.ConfigContext;
  import org.kuali.rice.coreservice.framework.CoreFrameworkServiceLocator;
  import org.kuali.rice.kim.api.identity.Person;
  import org.kuali.rice.kim.api.services.KimApiServiceLocator;
  import org.kuali.rice.krad.data.platform.MaxValueIncrementerFactory;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.service.KualiModuleService;
  import org.kuali.rice.krad.service.ModuleService;
  import org.kuali.rice.krad.util.GlobalVariables;
  import org.kuali.rice.krad.util.KRADConstants;
  
  import javax.sql.DataSource;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Date;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Defines functions that can be used in el expressions within
   * the UIF dictionary files
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class ExpressionFunctions {
  
      /**
       * Checks whether the given class parameter is assignable from the given object class
       * parameter
       *
       * @param assignableClass class to use for assignable to
       * @param objectClass class to use for assignable from
       * @return true if the object class is of type assignable class, false if not
       */
      public static boolean isAssignableFrom(Class<?> assignableClass, Class<?> objectClass) {
          return assignableClass.isAssignableFrom(objectClass);
      }
  
      /**
       * Checks whether the given value is null or blank string
       *
       * @param value property value to check
       * @return true if value is null or blank, false if not
       */
      public static boolean empty(Object value) {
          return (value == null) || (StringUtils.isBlank(value.toString()));
      }
  
      /**
       * Checks to see if the list is empty.  Throws a RuntimeException if list is not a List.
       *
       * @param list the list
       * @return true if the list is null or empty, false otherwise
       */
      public static boolean emptyList(List<?> list) {
          return (list == null) || list.isEmpty();
      }
  
      /**
       * Check to see if the list contains the values passed in.
       *
       * <p>In the SpringEL call values can be single item or array due to the way the EL converts values.
       * The values can be string or numeric and should match
       * the content type being stored in the list.  If the list is String and the values passed in are not string,
       * toString() conversion will be used.  Returns true if the values are in the list and both lists are non-empty,
       * false otherwise.
       * </p>
       *
       * @param list the list to be evaluated
       * @param values the values to be to check for in the list
       * @return true if all values exist in the list and both values and list are non-null/not-empty, false otherwise
       */
      public static boolean listContains(List<?> list, Object[] values) {
          if (list != null && values != null && values.length > 0 && !list.isEmpty()) {
              //conversion for if the values are non-string but the list is string (special case)
              if (list.get(0) instanceof String && !(values[0] instanceof String)) {
                  String[] stringValues = new String[values.length];
                  for (int i = 0; i < values.length; i++) {
                      stringValues[i] = values[i].toString();
                  }
                 return list.containsAll(Arrays.asList(stringValues));
             } else if (list.get(0) instanceof Date && values[0] instanceof String) {
                 //TODO date conversion
                 return false;
             } else if (!(list.get(0) instanceof String) && values[0] instanceof String) {
                 //values passed in are string but the list is of objects, use object's toString method
                 List<String> stringList = new ArrayList<String>();
                 for (Object value : list) {
                     stringList.add(value.toString());
                 }
                 return stringList.containsAll(Arrays.asList(values));
             } else {
                 //no conversion for if neither list is String, assume matching types (numeric case)
                 return list.containsAll(Arrays.asList(values));
             }
         }
 
         //no cases satisfied, return false
         return false;
 
     }
 
     /**
      * Returns the name for the given class
      *
      * @param clazz class object to return name for
      * @return class name or empty string if class is null
      */
     public static String getName(Class<?> clazz) {
         if (clazz == null) {
             return "";
         } else {
             return clazz.getName();
         }
     }
 
     /**
      * Retrieves the value of the parameter identified with the given namespace, component, and name
      *
      * @param namespaceCode namespace code for the parameter to retrieve
      * @param componentCode component code for the parameter to retrieve
      * @param parameterName name of the parameter to retrieve
      * @return String value of parameter as a string or null if parameter does not exist
      */
     public static String getParam(String namespaceCode, String componentCode, String parameterName) {
         return CoreFrameworkServiceLocator.getParameterService().getParameterValueAsString(namespaceCode, componentCode,
                 parameterName);
     }
 
     /**
      * Retrieves the value of the parameter identified with the given namespace, component, and name and converts
      * to a Boolean
      *
      * @param namespaceCode namespace code for the parameter to retrieve
      * @param componentCode component code for the parameter to retrieve
      * @param parameterName name of the parameter to retrieve
      * @return Boolean value of parameter as a boolean or null if parameter does not exist
      */
     public static Boolean getParamAsBoolean(String namespaceCode, String componentCode, String parameterName) {
         return CoreFrameworkServiceLocator.getParameterService().getParameterValueAsBoolean(namespaceCode,
                 componentCode, parameterName);
     }
 
     /**
      * Indicates whether the current user has the permission identified by the given namespace and permission name
      *
      * @param namespaceCode namespace code for the permission to check
      * @param permissionName name of the permission to check
      * @return true if the current user has the permission, false if not or the permission does not exist
      */
     public static boolean hasPerm(String namespaceCode, String permissionName) {
         Person user = GlobalVariables.getUserSession().getPerson();
 
         return KimApiServiceLocator.getPermissionService().hasPermission(user.getPrincipalId(), namespaceCode,
                 permissionName);
     }
 
     /**
      * Indicates whether the current user has the permission identified by the given namespace and permission name
      * and with the given details and role qualification
      *
      * @param namespaceCode namespace code for the permission to check
      * @param permissionName name of the permission to check
      * @param permissionDetails details for the permission check
      * @param roleQualifiers qualification for assigned roles
      * @return true if the current user has the permission, false if not or the permission does not exist
      */
     public static boolean hasPermDtls(String namespaceCode, String permissionName,
             Map<String, String> permissionDetails, Map<String, String> roleQualifiers) {
         Person user = GlobalVariables.getUserSession().getPerson();
 
         return KimApiServiceLocator.getPermissionService().isAuthorized(user.getPrincipalId(), namespaceCode,
                 permissionName, roleQualifiers);
     }
 
     /**
      * Indicates whether the current user has the permission identified by the given namespace and template name
      * and with the given details and role qualification
      *
      * @param namespaceCode namespace code for the permission to check
      * @param templateName name of the permission template to find permissions for
      * @param permissionDetails details for the permission check
      * @param roleQualifiers qualification for assigned roles
      * @return true if the current user has a permission with the given template, false if not or
      *         the permission does not exist
      */
     public static boolean hasPermTmpl(String namespaceCode, String templateName, Map<String, String> permissionDetails,
             Map<String, String> roleQualifiers) {
         Person user = GlobalVariables.getUserSession().getPerson();
 
         return KimApiServiceLocator.getPermissionService().isAuthorizedByTemplate(user.getPrincipalId(), namespaceCode,
                 templateName, permissionDetails, roleQualifiers);
     }
 
     /**
      * Gets the next available number from a sequence
      *
      * @param sequenceName name of the sequence to retrieve from
      * @return next sequence value
      */
     public static Long sequence(String sequenceName) {
         DataSource dataSource = (DataSource) ConfigContext.getCurrentContextConfig().getObject(KRADConstants.KRAD_APPLICATION_DATASOURCE);
         if (dataSource == null) {
             dataSource = KRADServiceLocator.getKradApplicationDataSource();
         }
         return Long.valueOf(MaxValueIncrementerFactory.getIncrementer(dataSource, sequenceName).nextLongValue());
 
     }
 
     /**
      * Get the a primary key (valid for inquiry/maintenance view retrieval) for the dataObject by class name passed in
      *
      * @param dataObjectClassName the class name to get the key for
      * @return a key valid for use as a request parameter for retrieving an inquiry or maintenance doc
      */
     public static String getDataObjectKey(String dataObjectClassName) {
 
         if (StringUtils.isBlank(dataObjectClassName)) {
             throw new RuntimeException("getDataObjectKey SpringEL function failed because the class name was blank");
         }
 
         Class dataObjectClass = null;
 
         try {
             dataObjectClass = Class.forName(dataObjectClassName);
         } catch (ClassNotFoundException e) {
             throw new RuntimeException(
                     "getDataObjectKey SpringEL function failed when trying to find class " + dataObjectClassName, e);
         }
 
         // build list of key values from the map parameters
         List<String> pkPropertyNames = KRADServiceLocatorWeb.getLegacyDataAdapter().listPrimaryKeyFieldNames(dataObjectClass);
 
         //return first primary key found
         if (pkPropertyNames != null && !pkPropertyNames.isEmpty()) {
             return pkPropertyNames.get(0);
         }
 
         //this likely won't be reached, as most should have a primary key (assumption)
         KualiModuleService kualiModuleService = KRADServiceLocatorWeb.getKualiModuleService();
         ModuleService moduleService = kualiModuleService.getResponsibleModuleService(dataObjectClass);
 
         // some classes might have alternate keys defined for retrieving
         List<List<String>> altKeys = null;
         if (moduleService != null) {
             altKeys = moduleService.listAlternatePrimaryKeyFieldNames(dataObjectClass);
         }
 
         if (altKeys != null && !altKeys.isEmpty()) {
             for (List<String> list : altKeys) {
                 if (list != null && !list.isEmpty()) {
                     //return any key first found
                     return list.get(0);
                 }
             }
         }
 
         return null;
     }
 }