/**
    * Copyright 2005-2015 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.web.bind;
  
  import org.apache.commons.lang.StringUtils;
  import org.joda.time.DateTime;
  import org.kuali.rice.core.api.CoreConstants;
  import org.kuali.rice.core.api.datetime.DateTimeService;
  import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;
  import org.kuali.rice.core.api.util.RiceKeyConstants;
  import org.kuali.rice.core.web.format.FormatException;
  
  import java.beans.PropertyEditorSupport;
  import java.io.Serializable;
  import java.sql.Date;
  import java.sql.Timestamp;
  import java.text.ParseException;
  import java.util.Calendar;
  
  /**
   * PropertyEditor converts between timestamp display strings and @{DateTime} objects.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class UifDateTimeEditor extends PropertyEditorSupport implements Serializable {
  
      private static final long serialVersionUID = -1315597474978280713L;
  
      private transient DateTimeService dateTimeService;
  
      /**
       * {@inheritDoc}
       *
       * <p>
       * This implementation uses the {@link DateTimeService} to convert the {@link DateTime} object to a
       * {@link Timestamp} display string.
       * </p>
       */
      @Override
      public String getAsText() {
          if (getValue() == null) {
              return null;
          }
  
          if (getValue().equals(StringUtils.EMPTY)) {
              return null;
          }
  
          DateTime value = (DateTime) getValue();
  
          return getDateTimeService().toDateTimeString(new Timestamp(value.getMillis()));
      }
  
      /**
       * {@inheritDoc}
       *
       * This implementation converts the {@link Date} display string to a {@link DateTime} object using the
       * {@link DateTimeService}.
       */
      @Override
      public void setAsText(String text) throws IllegalArgumentException {
          if (StringUtils.isBlank(text)) {
              setValue(null);
              return;
          }
  
          try {
              Date value = getDateTimeService().convertToSqlDate(text);
  
              Calendar calendar = Calendar.getInstance();
              calendar.setTime(value);
              if (calendar.get(Calendar.YEAR) < 1000 && verbatimYear(text).length() < 4) {
                  throw new FormatException("illegal year format", RiceKeyConstants.ERROR_DATE, text);
              }
  
              setValue(new DateTime(value.getTime()));
          } catch (ParseException e) {
              throw new FormatException("parsing", RiceKeyConstants.ERROR_DATE, text, e);
          }
      }
  
      /**
       * For a given user input date, this method returns the exact string the
       * user entered after the last slash. This allows the formatter to
       * distinguish between ambiguous values such as "/06" "/6" and "/0006"
       *
      * @param date the date to process
      *
      * @return the year
      */
     protected String verbatimYear(String date) {
         String result = "";
 
         int pos = date.lastIndexOf("/");
         if (pos >= 0) {
             result = date.substring(pos);
         }
 
         return result;
     }
 
     /**
      * Returns the {@link DateTimeService}.
      *
      * @return the {@link DateTimeService}
      */
     protected DateTimeService getDateTimeService() {
         if (dateTimeService == null) {
             dateTimeService = GlobalResourceLoader.getService(CoreConstants.Services.DATETIME_SERVICE);
         }
 
         return dateTimeService;
     }
 
 }