/*
    * Copyright 2008 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.ole.module.purap.util;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.log4j.Logger;
  import org.kuali.ole.module.purap.PurapConstants;
  import org.kuali.ole.sys.context.SpringContext;
  import org.kuali.rice.core.api.datetime.DateTimeService;
  
  import java.sql.Date;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Calendar;
  
  public class ElectronicInvoiceUtils {
  
      private final static Logger LOG = Logger.getLogger(ElectronicInvoiceUtils.class);
  
      public static Date getDate(String invoiceDateString) {
  
          boolean formatInvalid = true;
          String formattedDateString = "";
          String stringToParse = null;
  
          if (StringUtils.isNotEmpty(invoiceDateString)) {
  
              String dateToConvert = null;
              // get a copy of given date with 0's for all numbers to check format
              formattedDateString = invoiceDateString.replaceAll("\\d", "0");
  
              if (PurApDateFormatUtils.getFormattingString(PurapConstants.NamedDateFormats.CXML_DATE_FORMAT).equals(formattedDateString)) {
                  // Date is in 0000-00-00 format
                  formatInvalid = false;
                  stringToParse = invoiceDateString;
              } else if (PurApDateFormatUtils.getFormattingString(PurapConstants.NamedDateFormats.KUALI_DATE_FORMAT).equals(formattedDateString)) {
                  try {
                      java.util.Date javaDate = SpringContext.getBean(DateTimeService.class).convertToDate(invoiceDateString);
                      return org.kuali.ole.sys.util.KfsDateUtils.convertToSqlDate(javaDate);
                  } catch (ParseException e) {
                      return null;
                  }
              } else if (PurApDateFormatUtils.getFormattingString(PurapConstants.NamedDateFormats.CXML_DATE_FORMAT).length() != formattedDateString.length()) {
                  // strings are not the same length... must parse down given string from cXML for validation
                  formattedDateString = formattedDateString.substring(0, PurApDateFormatUtils.getFormattingString(PurapConstants.NamedDateFormats.CXML_DATE_FORMAT).length());
                  // strings should now be same length
                  if (PurApDateFormatUtils.getFormattingString(PurapConstants.NamedDateFormats.CXML_DATE_FORMAT).equals(formattedDateString)) {
                      // if strings are equal we can process date
                      formatInvalid = false;
                      stringToParse = invoiceDateString.substring(0, PurApDateFormatUtils.getFormattingString(PurapConstants.NamedDateFormats.CXML_DATE_FORMAT).length());
                  } else {
                      // strings are same size and both only use 0 characters so date is invalid
                  }
              } else {
                  /*
                   * strings are of same length but are not equal this can only occur if date separators are invalid so we have an
                   * invalid format
                   */
              }
          }
  
          if (formatInvalid) {
              return null;
          } else {
              // try to parse date
              SimpleDateFormat sdf = PurApDateFormatUtils.getSimpleDateFormat(PurapConstants.NamedDateFormats.CXML_SIMPLE_DATE_FORMAT);
              try {
                  return org.kuali.ole.sys.util.KfsDateUtils.convertToSqlDate(sdf.parse(stringToParse));
              } catch (ParseException e) {
                  return null;
              }
          }
  
      }
  
      public static String getDateDisplayText(java.util.Date date) {
          Calendar c = Calendar.getInstance();
          c.setTime(date);
          // we add one to the month below because January = 0, February = 1, March = 2, and so on
          String monthPart = (c.get(Calendar.MONTH) + 1) + "";
          String dayPart = c.get(Calendar.DATE) + "";
          if (monthPart.length() == 1) {
              monthPart = "0" + monthPart;
          }
  
          if (dayPart.length() == 1) {
             dayPart = "0" + dayPart;
         }
 
         String useDate = monthPart + "/" + dayPart + "/" + c.get(Calendar.YEAR);
         String actualDate = (date != null) ? date.toString() : "empty given date";
         return useDate;
     }
 
     public static String stripSplChars(String data) {
         if (data != null) {
             StringBuffer result = new StringBuffer();
             for (int i = 0; i < data.length(); i++) {
                 if (Character.isLetterOrDigit(data.charAt(i))) {
                     result.append(data.charAt(i));
                 }
             }
             return result.toString();
         } else {
             return null;
         }
     }
 
 }