/**
    * 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.krad.util;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.coreservice.framework.CoreFrameworkServiceLocator;
  import org.kuali.rice.core.api.CoreApiServiceLocator;
  import org.kuali.rice.core.api.encryption.EncryptionService;
  import org.kuali.rice.core.api.util.type.KualiDecimal;
  import org.kuali.rice.coreservice.framework.parameter.ParameterConstants;
  import org.kuali.rice.coreservice.framework.parameter.ParameterService;
  import org.kuali.rice.core.web.format.BooleanFormatter;
  import org.kuali.rice.krad.UserSession;
  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.uif.util.ObjectPropertyUtils;
  
  import javax.servlet.ServletRequest;
  import javax.servlet.http.HttpServletRequest;
  import java.lang.reflect.Constructor;
  import java.security.GeneralSecurityException;
  import java.text.NumberFormat;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.regex.Pattern;
  
  /**
   * Miscellaneous Utility Methods
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public final class KRADUtils {
      private static KualiModuleService kualiModuleService;
  
      private KRADUtils() {
          throw new UnsupportedOperationException("do not call");
      }
  
      public final static String getBusinessTitleForClass(Class<? extends Object> clazz) {
          if (clazz == null) {
              throw new IllegalArgumentException(
                      "The getBusinessTitleForClass method of KRADUtils requires a non-null class");
          }
          String className = clazz.getSimpleName();
  
          StringBuffer label = new StringBuffer(className.substring(0, 1));
          for (int i = 1; i < className.length(); i++) {
              if (Character.isLowerCase(className.charAt(i))) {
                  label.append(className.charAt(i));
              } else {
                  label.append(" ").append(className.charAt(i));
              }
          }
          return label.toString().trim();
      }
  
      /**
       * Picks off the filename from the full path. Takes care of different OS seperators.
       */
      public final static List<String> getFileNameFromPath(List<String> fullFileNames) {
          List<String> fileNameList = new ArrayList<String>();
  
          for (String fullFileName : fullFileNames) {
              if (StringUtils.contains(fullFileName, "/")) {
                  fileNameList.add(StringUtils.substringAfterLast(fullFileName, "/"));
              } else {
                  fileNameList.add(StringUtils.substringAfterLast(fullFileName, "\\"));
              }
          }
  
          return fileNameList;
      }
  
      private static final KualiDecimal ONE_HUNDRED = new KualiDecimal("100.00");
  
      /**
       * Convert the given monney amount into an interger string. Since the return string cannot have decimal point,
       * multiplies the
       * amount by 100 so the decimal places are not lost, for example, 320.15 is converted into 32015.
      *
      * @return an integer string of the given money amount through multiplicating by 100 and removing the fraction
      *         portion.
      */
     public final static String convertDecimalIntoInteger(KualiDecimal decimalNumber) {
         KualiDecimal decimalAmount = decimalNumber.multiply(ONE_HUNDRED);
         NumberFormat formatter = NumberFormat.getIntegerInstance();
         String formattedAmount = formatter.format(decimalAmount);
 
         return StringUtils.replace(formattedAmount, ",", "");
     }
 
     public static Integer getIntegerValue(String numberStr) {
         Integer numberInt = null;
         try {
             numberInt = new Integer(numberStr);
         } catch (NumberFormatException nfe) {
             Double numberDbl = new Double(numberStr);
             numberInt = new Integer(numberDbl.intValue());
         }
         return numberInt;
     }
 
     public static Object createObject(Class<?> clazz, Class<?>[] argumentClasses, Object[] argumentValues) {
         if (clazz == null)
             return null;
         try {
             Constructor<?> constructor = clazz.getConstructor(argumentClasses);
             return constructor.newInstance(argumentValues);
         } catch (Exception e) {
             return null;
         }
     }
 
     public static String joinWithQuotes(List<String> list) {
         if (list == null || list.size() == 0)
             return "";
 
         return KRADConstants.SINGLE_QUOTE +
                 StringUtils.join(list.iterator(), KRADConstants.SINGLE_QUOTE + "," + KRADConstants.SINGLE_QUOTE) +
                 KRADConstants.SINGLE_QUOTE;
     }
 
     private static KualiModuleService getKualiModuleService() {
         if (kualiModuleService == null) {
             kualiModuleService = KRADServiceLocatorWeb.getKualiModuleService();
         }
         return kualiModuleService;
     }
 
     /**
      * TODO this method will probably need to be exposed in a public KRADUtils class as it is used
      * by several different modules.  That will have to wait until ModuleService and KualiModuleService are moved
      * to core though.
      */
     public static String getNamespaceCode(Class<? extends Object> clazz) {
         ModuleService moduleService = getKualiModuleService().getResponsibleModuleService(clazz);
         if (moduleService == null) {
             return KRADConstants.DEFAULT_NAMESPACE;
         }
         return moduleService.getModuleConfiguration().getNamespaceCode();
     }
 
     public static Map<String, String> getNamespaceAndComponentSimpleName(Class<? extends Object> clazz) {
         Map<String, String> map = new HashMap<String, String>();
         map.put(KRADConstants.NAMESPACE_CODE, getNamespaceCode(clazz));
         map.put(KRADConstants.COMPONENT_NAME, getComponentSimpleName(clazz));
         return map;
     }
 
     public static Map<String, String> getNamespaceAndComponentFullName(Class<? extends Object> clazz) {
         Map<String, String> map = new HashMap<String, String>();
         map.put(KRADConstants.NAMESPACE_CODE, getNamespaceCode(clazz));
         map.put(KRADConstants.COMPONENT_NAME, getComponentFullName(clazz));
         return map;
     }
 
     public static Map<String, String> getNamespaceAndActionClass(Class<? extends Object> clazz) {
         Map<String, String> map = new HashMap<String, String>();
         map.put(KRADConstants.NAMESPACE_CODE, getNamespaceCode(clazz));
         map.put(KRADConstants.ACTION_CLASS, clazz.getName());
         return map;
     }
 
     private static String getComponentSimpleName(Class<? extends Object> clazz) {
         return clazz.getSimpleName();
     }
 
     private static String getComponentFullName(Class<? extends Object> clazz) {
         return clazz.getName();
     }
 
     /**
      * Parses a string that is in map format (commas separating map entries, colon separates
      * map key/value) to a new map instance
      *
      * @param parameter - string parameter to parse
      * @return Map<String, String> instance populated from string parameter
      */
     public static Map<String, String> convertStringParameterToMap(String parameter) {
         Map<String, String> map = new HashMap<String, String>();
 
         if (StringUtils.isNotBlank(parameter)) {
             if (StringUtils.contains(parameter, ",")) {
                 String[] fieldConversions = StringUtils.split(parameter, ",");
 
                 for (int i = 0; i < fieldConversions.length; i++) {
                     String fieldConversionStr = fieldConversions[i];
                     if (StringUtils.isNotBlank(fieldConversionStr)) {
                         if (StringUtils.contains(fieldConversionStr, ":")) {
                             String[] fieldConversion = StringUtils.split(fieldConversionStr, ":");
                             map.put(fieldConversion[0], fieldConversion[1]);
                         } else {
                             map.put(fieldConversionStr, fieldConversionStr);
                         }
                     }
                 }
             } else if (StringUtils.contains(parameter, ":")) {
                 String[] fieldConversion = StringUtils.split(parameter, ":");
                 map.put(fieldConversion[0], fieldConversion[1]);
             } else {
                 map.put(parameter, parameter);
             }
         }
 
         return map;
     }
 
     /**
      * Parses a string that is in list format (commas separating list entries) to a new List instance
      *
      * @param parameter - string parameter to parse
      * @return List<String> instance populated from string parameter
      */
     public static List<String> convertStringParameterToList(String parameter) {
         List<String> list = new ArrayList<String>();
 
         if (StringUtils.isNotBlank(parameter)) {
             if (StringUtils.contains(parameter, ",")) {
                 String[] parameters = StringUtils.split(parameter, ",");
                 List arraysList = Arrays.asList(parameters);
                 list.addAll(arraysList);
             } else {
                 list.add(parameter);
             }
         }
 
         return list;
     }
 
     /**
      * Translates characters in the given string like brackets that will cause
      * problems with binding to characters that do not affect the binding
      *
      * @param key - string to translate
      * @return String translated string
      */
     public static String translateToMapSafeKey(String key) {
         String safeKey = key;
 
         safeKey = StringUtils.replace(safeKey, "[", "_");
         safeKey = StringUtils.replace(safeKey, "]", "_");
 
         return safeKey;
     }
 
     /**
      * Builds a string from the given map by joining each entry with a comma and
      * each key/value pair with a colon
      *
      * @param map - map instance to build string for
      * @return String of map entries
      */
     public static String buildMapParameterString(Map<String, String> map) {
         String parameterString = "";
 
         for (Map.Entry<String, String> entry : map.entrySet()) {
             if (StringUtils.isNotBlank(parameterString)) {
                 parameterString += ",";
             }
 
             parameterString += entry.getKey() + ":" + entry.getValue();
         }
 
         return parameterString;
     }
 
     /**
      * Parses the given string into a Map by splitting on the comma to get the
      * map entries and within each entry splitting by colon to get the key/value
      * pairs
      *
      * @param parameterString - string to parse into map
      * @return Map<String, String> map from string
      */
     public static Map<String, String> getMapFromParameterString(String parameterString) {
         Map<String, String> map = new HashMap<String, String>();
 
         String[] entries = parameterString.split(",");
         for (int i = 0; i < entries.length; i++) {
             String[] keyValue = entries[i].split(":");
             if (keyValue.length != 2) {
                 throw new RuntimeException("malformed field conversion pair: " + Arrays.toString(keyValue));
             }
 
             map.put(keyValue[0], keyValue[1]);
         }
 
         return map;
     }
 
     /**
      * Retrieves value for the given parameter name in the request and attempts to convert to a Boolean using
      * the <code>BooleanFormatter</code>
      *
      * @param request - servlet request containing parameters
      * @param parameterName - name of parameter to retrieve value for
      * @return Boolean set to value of parameter, or null if parameter was not found in request
      */
     public static Boolean getRequestParameterAsBoolean(ServletRequest request, String parameterName) {
         Boolean parameterValue = null;
 
         String parameterValueStr = request.getParameter(parameterName);
         if (StringUtils.isNotBlank(parameterValueStr)) {
             parameterValue = (Boolean) new BooleanFormatter().convertFromPresentationFormat(parameterValueStr);
         }
 
         return parameterValue;
     }
 
     /**
      * Translates the given Map of String keys and String array values to a Map
      * of String key and values. If the String array contains more than one
      * value, the single string is built by joining the values with the vertical
      * bar character
      *
      * @param requestParameters - Map of request parameters to translate
      * @return Map<String, String> translated Map
      */
     public static Map<String, String> translateRequestParameterMap(Map<String, String[]> requestParameters) {
         Map<String, String> parameters = new HashMap<String, String>();
 
         for (Map.Entry<String, String[]> parameter : requestParameters.entrySet()) {
             String parameterValue = "";
             if (parameter.getValue().length > 1) {
                 parameterValue = StringUtils.join(parameter.getValue(), "|");
             } else {
                 parameterValue = parameter.getValue()[0];
             }
             parameters.put(parameter.getKey(), parameterValue);
         }
 
         return parameters;
     }
 
     /**
      * Retrieves parameter values from the request that match the requested
      * names. In addition, based on the object class an authorization check is
      * performed to determine if the values are secure and should be decrypted.
      * If true, the value is decrypted before returning
      *
      * @param parameterNames - names of the parameters whose values should be retrieved
      * from the request
      * @param parentObjectClass - object class that contains the parameter names as properties
      * and should be consulted for security checks
      * @param requestParameters - all request parameters to pull from
      * @return Map<String, String> populated with parameter name/value pairs
      *         pulled from the request
      */
     public static Map<String, String> getParametersFromRequest(List<String> parameterNames, Class<?> parentObjectClass,
             Map<String, String> requestParameters) {
         Map<String, String> parameterValues = new HashMap<String, String>();
 
         for (Iterator<String> iter = parameterNames.iterator(); iter.hasNext(); ) {
             String keyPropertyName = iter.next();
 
             if (requestParameters.get(keyPropertyName) != null) {
                 String keyValue = requestParameters.get(keyPropertyName);
 
                 // Check if this element was encrypted, if it was decrypt it
                 if (KRADServiceLocatorWeb.getDataObjectAuthorizationService()
                         .attributeValueNeedsToBeEncryptedOnFormsAndLinks(parentObjectClass, keyPropertyName)) {
                     try {
                         keyValue = StringUtils.removeEnd(keyValue, EncryptionService.ENCRYPTION_POST_PREFIX);
                         keyValue = CoreApiServiceLocator.getEncryptionService().decrypt(keyValue);
                     } catch (GeneralSecurityException e) {
                         throw new RuntimeException(e);
                     }
                 }
 
                 parameterValues.put(keyPropertyName, keyValue);
             }
         }
 
         return parameterValues;
     }
 
     /**
      * Builds a Map containing a key/value pair for each property given in the property names list, general
      * security is checked to determine if the value needs to be encrypted along with applying formatting to
      * the value
      *
      * @param propertyNames - list of property names to get key/value pairs for
      * @param dataObject - object instance containing the properties for which the values will be pulled
      * @return Map<String, String> containing entry for each property name with the property name as the map key
      *         and the property value as the value
      */
     public static Map<String, String> getPropertyKeyValuesFromDataObject(List<String> propertyNames,
             Object dataObject) {
         Map<String, String> propertyKeyValues = new HashMap<String, String>();
 
         if (dataObject == null) {
             return propertyKeyValues;
         }
 
         // iterate through properties and add a map entry for each
         for (String propertyName : propertyNames) {
             Object propertyValue = ObjectPropertyUtils.getPropertyValue(dataObject, propertyName);
             if (propertyValue == null) {
                 propertyValue = StringUtils.EMPTY;
             }
 
             if (KRADServiceLocatorWeb.getDataObjectAuthorizationService()
                     .attributeValueNeedsToBeEncryptedOnFormsAndLinks(dataObject.getClass(), propertyName)) {
                 try {
                     propertyValue = CoreApiServiceLocator.getEncryptionService().encrypt(propertyValue) +
                             EncryptionService.ENCRYPTION_POST_PREFIX;
                 } catch (GeneralSecurityException e) {
                     throw new RuntimeException("Exception while trying to encrypt value for key/value map.", e);
                 }
             }
 
             // TODO: need to apply formatting to return value once util class is ready
             propertyKeyValues.put(propertyName, propertyValue.toString());
         }
 
         return propertyKeyValues;
     }
 
     public static boolean containsSensitiveDataPatternMatch(String fieldValue) {
         if (StringUtils.isBlank(fieldValue)) {
             return false;
         }
         ParameterService parameterService = CoreFrameworkServiceLocator.getParameterService();
         Collection<String> sensitiveDataPatterns = parameterService
                 .getParameterValuesAsString(KRADConstants.KRAD_NAMESPACE, ParameterConstants.ALL_COMPONENT,
                         KRADConstants.SystemGroupParameterNames.SENSITIVE_DATA_PATTERNS);
         for (String pattern : sensitiveDataPatterns) {
             if (Pattern.compile(pattern).matcher(fieldValue).find()) {
                 return true;
             }
         }
         return false;
     }
 
     /**
      * Gets the UserSession object from the HttpServletRequest object's
      * associated session.
      *
      * <p>
      * In some cases (different threads) the UserSession cannot be retrieved
      * from GlobalVariables but can still be accessed via the session object
      * </p>
      */
     public static final UserSession getUserSessionFromRequest(HttpServletRequest request) {
         return (UserSession) request.getSession().getAttribute(KRADConstants.USER_SESSION_KEY);
     }
 
     /**
      * @return whether the deploy environment is production
      */
     public static boolean isProductionEnvironment() {
         return KRADServiceLocator.getKualiConfigurationService().getPropertyValueAsString(
                 KRADConstants.PROD_ENVIRONMENT_CODE_KEY)
                 .equalsIgnoreCase(KRADServiceLocator.getKualiConfigurationService().getPropertyValueAsString(
                         KRADConstants.ENVIRONMENT_KEY));
     }
 
 }