/*

  * Copyright 2004 Jonathan M. Lehr

  *

  * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0

  *

  * 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.

  * 

  * MODIFIED BY THE KUALI FOUNDATION

  */

 // begin Kuali Foundation modification

 package org.kuali.rice.core.web.format;

 // end Kuali Foundation modification

 // begin Kuali Foundation modification

 import java.text.DecimalFormat;

 import java.text.NumberFormat;

 import java.text.ParseException;

 import java.util.regex.Pattern;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.util.RiceKeyConstants;

 import org.kuali.rice.core.util.type.KualiDecimal;

 import org.kuali.rice.core.util.type.KualiInteger;

 /**

  * begin Kuali Foundation modification

  * This class is used to format Currency objects.

  * end Kuali Foundation modification

  */

 public class CurrencyFormatter extends Formatter {

     private static final long serialVersionUID = -7986953503122821012L;

         // begin Kuali Foundation modification

     // original code

     /*

     /** The default scale for currency values * /

     public final static int SCALE = 2;

     /** The key used to look up the currency error string * /

     public final static String CURRENCY_ERROR_KEY = "error.currency";

     public static final String SHOW_SYMBOL = "showCurrencySymbol";

     static final String PARSE_MSG = "Unable to parse a currency value from ";

     static final String FORMAT_MSG = "Unable to format a currency value from ";

     */

     private static Logger LOG = Logger.getLogger(CurrencyFormatter.class);

     public static final String SHOW_SYMBOL = "showCurrencySymbol";

     private static final Pattern CURRENCY_PATTERN = Pattern.compile("[-\\(\\)\\$\\.,0-9]*");

     private static final Pattern TRAILING_DECIMAL_PATTERN = Pattern.compile("^(\\.[0-9]{0,2}){0,1}\\)?$");

     // end Kuali Foundation modification

     /**

      * begin Kuali Foundation modification

      * Unformats its argument and returns a KualiDecimal instance initialized with the resulting string value

      * 

      * @see org.kuali.rice.core.web.format.Formatter#convertToObject(java.lang.String)

      * end Kuali Foundation modification

      */

     @Override

     protected Object convertToObject(String target) {

         // begin Kuali Foundation modification

         KualiDecimal value = null;

         LOG.debug("convertToObject '" + target + "'");

         if (target != null) {

             target = target.trim();

             String rawString = target;

             // parseable values are $1.23 and ($1.23), not (1.23)

             if (target.startsWith("(")) {

                 if (!target.startsWith("($")) {

                     target = "($" + StringUtils.substringAfter(target, "(");

                 }

             }

             // Insert currency symbol if absent

             if (!(target.startsWith("(") || target.startsWith(getSymbol()))) {

                 target = interpolateSymbol(target);

             }

             // preemptively detect non-numeric-related symbols, since NumberFormat.parse seems to be silently deleting them

             // (i.e. 9aaaaaaaaaaaaaaa is silently converted into 9)

             if (!CURRENCY_PATTERN.matcher(target).matches()) {

                 throw new FormatException("parsing", RiceKeyConstants.ERROR_CURRENCY, rawString);

             }

             // preemptively detect String with excessive digits after the decimal, to prevent them from being silently rounded

             if (rawString.contains(".") && !TRAILING_DECIMAL_PATTERN.matcher(target.substring(target.indexOf("."), target.length())).matches()) {

                 throw new FormatException("parsing", RiceKeyConstants.ERROR_CURRENCY_DECIMAL, rawString);

             }

             // actually reformat the numeric value

             NumberFormat formatter = getCurrencyInstanceUsingParseBigDecimal();

             try {

                 Number parsedNumber = formatter.parse(target);

                 value = new KualiDecimal(parsedNumber.toString());

             }

             catch (NumberFormatException e) {

                 throw new FormatException("parsing", RiceKeyConstants.ERROR_CURRENCY, rawString, e);

             }

             catch (ParseException e) {

                 throw new FormatException("parsing", RiceKeyConstants.ERROR_CURRENCY, rawString, e);

             }

         }

         return value;

         // end Kuali Foundation modification

     }

     protected String interpolateSymbol(String target) {

         if (target.startsWith("-")) {

             int dashPos = target.indexOf('-');

             int symbolPos = target.indexOf(getSymbol());

             int index = (dashPos > symbolPos ? dashPos : symbolPos);

             return "($" + target.substring(index + 1) + ")";

         }

         return target.startsWith("(") ? "($" + target.indexOf("(" + 1) : "$" + target;

     }

     protected String removeSymbol(String target) {

         int index = target.indexOf(getSymbol());

         String prefix = (index > 0 ? target.substring(0, index) : "");

         return prefix + target.substring(index + 1);

     }

     protected String getSymbol() {

         return "$";

     }

     protected boolean showSymbol() {

         String showSymbol = (settings == null ? null : (String) settings.get(SHOW_SYMBOL));

         return Boolean.valueOf(showSymbol).booleanValue();

     }

     /**

      * Returns a string representation of its argument formatted as a currency value.

      * 

      * begin Kuali Foundation modification

      * @see org.kuali.rice.core.web.format.Formatter#format(java.lang.Object)

      * end Kuali Foundation modification

      */

     // begin Kuali Foundation modification

     @Override

     // end Kuali Foundation modification

     public Object format(Object obj) {

         // begin Kuali Foundation modification

         // major code rewrite, original code commented

         /*

         if (obj == null)

             return null;

         NumberFormat formatter = NumberFormat.getCurrencyInstance();

         String string = null;

         try {

             BigDecimal number = (BigDecimal) obj;

             number = number.setScale(SCALE, BigDecimal.ROUND_HALF_UP);

             string = formatter.format(number.doubleValue());

         } catch (IllegalArgumentException e) {

             throw new FormatException(FORMAT_MSG + obj, e);

         } catch (ClassCastException e) {

             throw new FormatException(FORMAT_MSG + obj, e);

         }

         return showSymbol() ? string : removeSymbol(string);

         */

         LOG.debug("format '" + obj + "'");

         if (obj == null)

             return null;

         NumberFormat formatter = getCurrencyInstanceUsingParseBigDecimal();

         String string = null;

         try {

             Number number;

             if (obj instanceof KualiInteger) {

                 formatter.setMaximumFractionDigits(0);

                 number = (KualiInteger) obj;

                 // Note that treating the number as a KualiDecimal below is obsolete. But it doesn't do any harm either since

                 // we already set maximumFractionDigits above.

             }

             else {

                 number = (KualiDecimal) obj;

             }

             // run the incoming KualiDecimal's string representation through convertToObject, so that KualiDecimal objects

             // containing ill-formatted incoming values will cause the same errors here that ill-formatted Strings do in

             // convertToObject

             KualiDecimal convertedNumber = (KualiDecimal) convertToObject(number.toString());

             string = formatter.format(convertedNumber.bigDecimalValue());

         }

         catch (IllegalArgumentException e) {

             throw new FormatException("formatting", RiceKeyConstants.ERROR_CURRENCY, obj.toString(), e);

         }

         catch (ClassCastException e) {

             throw new FormatException("formatting", RiceKeyConstants.ERROR_CURRENCY, obj.toString(), e);

         }

         return showSymbol() ? string : removeSymbol(string);

         // end Kuali Foundation modification

     }

     // begin Kuali Foundation modification

     /**

      * retrieves a currency formatter instance and sets ParseBigDecimal to true to fix [KULEDOCS-742]

      * 

      * @return CurrencyInstance

      */

     static final NumberFormat getCurrencyInstanceUsingParseBigDecimal() {

         NumberFormat formatter = NumberFormat.getCurrencyInstance();

         if (formatter instanceof DecimalFormat) {

             ((DecimalFormat) formatter).setParseBigDecimal(true);

         }

         return formatter;

     }

     // end Kuali Foundation modification

     // begin Kuali Foundation modification

     /**

      * Validates a currency string by passing it into the convertToObject method and determining if conversion succeeded.

      * 

      * @param currencyString The string to attempt to format.

      * @return True if no exceptions occurred when parsing and the conversion returned a non-null value; false otherwise.

      * @see org.kuali.rice.core.web.format.CurrencyFormatter#convertToObject(java.lang.String)

      */

     public boolean validate(String currencyString) {

             Object currencyObject = null;

             try {

                     currencyObject = convertToObject(currencyString);

             } catch (Exception e) {

                     currencyObject = null;

             }

             return (currencyObject != null);

     }

     // end Kuali Foundation modification

 }