/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  package org.apache.myfaces.commons.converter;
  
  import java.text.DecimalFormat;
  import java.text.DecimalFormatSymbols;
  import java.text.NumberFormat;
  import java.text.ParseException;
  import java.util.Currency;
  import java.util.Locale;
  
  import javax.el.ValueExpression;
  import javax.faces.application.FacesMessage;
  import javax.faces.component.StateHolder;
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  import javax.faces.convert.ConverterException;
  
  import org.apache.commons.beanutils.ConvertUtils;
  import org.apache.commons.beanutils.Converter;
  import org.apache.myfaces.commons.util.MessageUtils;
  
  /**
   * Converter which uses either the manually set <code>destType</code> or the value binding to determine the 
   * correct destination type to convert the number to
   * 
   * This tag creates a number formatting converter and associates it with the nearest 
   * parent UIComponent. It uses either the manually set destType or the value 
   * binding to determine the correct destination type to convert the number to. 
   * 
   * Unless otherwise specified, all attributes accept static values or EL expressions.
   * 
   * @JSFConverter
   *   name = "mcc:convertNumber"
   *   tagClass = "org.apache.myfaces.commons.converter.TypedNumberConverterTag" 
   *   serialuidtag = "-6592309048440572608L"
   *   
   * @author imario@apache.org
   */
  public class TypedNumberConverter implements javax.faces.convert.Converter, StateHolder
  {
      public static final String CONVERTER_ID = "org.apache.myfaces.custom.convertNumber.TypedNumberConverter";
  
      private Class destType;
  
      public TypedNumberConverter()
      {
      }
      
      public Object getAsObject(FacesContext facesContext, UIComponent uiComponent, String value)
      {
          Object convertedValue = _getAsObject(facesContext, uiComponent, value);
          if (convertedValue == null)
          {
              return null;
          }
  
          Class destType = getDestType(); 
          if (destType == null)
          {
              ValueExpression valueBinding = uiComponent.getValueExpression("value");
              if (valueBinding != null)
              {
                  destType = valueBinding.getType(facesContext.getELContext());
              }
          }
          
          if (destType != null)
          {
              Converter converter = ConvertUtils.lookup(destType);
              if (converter == null)
              {
                  throw new UnsupportedOperationException("cant deal with " + destType);
              }
  
              // setting type to null, in fact the documentation is wrong here and this type is never used
              convertedValue = converter.convert(null, convertedValue);
          }
          
          
          return convertedValue;
      }
  
     public void restoreState(FacesContext facesContext, Object state)
     {
         Object[] states = (Object[]) state;
         _restoreState(facesContext, states[0]);
         destType = (Class) states[1];
     }
 
     public Object saveState(FacesContext facesContext)
     {
         return new Object[]
                           {
                 _saveState(facesContext),
                 destType
                           };
     }
 
     /**
      * The java class name the value should be converted to. 
      * 
      * Default: automatically determined through valueBinding
      * 
      * @JSFProperty
      */
     public Class getDestType()
     {
         return destType;
     }
 
     public void setDestType(Class destType)
     {
         this.destType = destType;
     }
 
     /* ORIGINAL STUFF COPIED FROM javax.faces.convert.NumberConverter */
     
     // internal constants
     private static final String CONVERSION_MESSAGE_ID = "javax.faces.convert.NumberConverter.CONVERSION";
 
 
     private static final boolean JAVA_VERSION_14;
 
     static
     {
         JAVA_VERSION_14 = checkJavaVersion14();
     }
 
     private String _currencyCode;
     private String _currencySymbol;
     private Locale _locale;
     private int _maxFractionDigits;
     private int _maxIntegerDigits;
     private int _minFractionDigits;
     private int _minIntegerDigits;
     private String _pattern;
     private String _type = "number";
     private boolean _groupingUsed = true;
     private boolean _integerOnly = false;
     private boolean _transient;
 
     private boolean _maxFractionDigitsSet;
     private boolean _maxIntegerDigitsSet;
     private boolean _minFractionDigitsSet;
     private boolean _minIntegerDigitsSet;
 
 
     // METHODS
     public Object _getAsObject(FacesContext facesContext, UIComponent uiComponent, String value)
     {
         if (facesContext == null) throw new NullPointerException("facesContext");
         if (uiComponent == null) throw new NullPointerException("uiComponent");
 
         if (value != null)
         {
             value = value.trim();
             if (value.length() > 0)
             {
                 NumberFormat format = getNumberFormat(facesContext);
                 format.setParseIntegerOnly(_integerOnly);
                 try
                 {
                     return format.parse(value);
                 }
                 catch (ParseException e)
                 {
                     FacesMessage message = MessageUtils.getMessage(facesContext, CONVERSION_MESSAGE_ID, new Object[]{uiComponent.getId(),value});
                     message.setSeverity(FacesMessage.SEVERITY_ERROR);
                     
                     throw new ConverterException(message, e);
                 }
             }
         }
         return null;
     }
 
     public String getAsString(FacesContext facesContext, UIComponent uiComponent, Object value)
     {
         if (facesContext == null) throw new NullPointerException("facesContext");
         if (uiComponent == null) throw new NullPointerException("uiComponent");
 
         if (value == null)
         {
             return "";
         }
         if (value instanceof String)
         {
             return (String)value;
         }
 
         NumberFormat format = getNumberFormat(facesContext);
         format.setGroupingUsed(_groupingUsed);
         if (_maxFractionDigitsSet) format.setMaximumFractionDigits(_maxFractionDigits);
         if (_maxIntegerDigitsSet) format.setMaximumIntegerDigits(_maxIntegerDigits);
         if (_minFractionDigitsSet) format.setMinimumFractionDigits(_minFractionDigits);
         if (_minIntegerDigitsSet) format.setMinimumIntegerDigits(_minIntegerDigits);
         formatCurrency(format);
         try
         {
             return format.format(value);
         }
         catch (Exception e)
         {
             throw new ConverterException("Cannot convert value '" + value + "'");
         }
     }
 
     private NumberFormat getNumberFormat(FacesContext facesContext)
     {
         Locale lokale = _locale != null ? _locale : facesContext.getViewRoot().getLocale();
 
         if (_pattern == null && _type == null)
         {
             throw new ConverterException("Cannot get NumberFormat, either type or pattern needed.");
         }
 
         // pattern
         if (_pattern != null)
         {
             return new DecimalFormat(_pattern, new DecimalFormatSymbols(lokale));
         }
 
         // type
         if (_type.equals("number"))
         {
             return NumberFormat.getNumberInstance(lokale);
         }
         else if (_type.equals("currency"))
         {
             return NumberFormat.getCurrencyInstance(lokale);
         }
         else if (_type.equals("percent"))
         {
             return NumberFormat.getPercentInstance(lokale);
         }
         throw new ConverterException("Cannot get NumberFormat, illegal type " + _type);
     }
 
     private void formatCurrency(NumberFormat format)
     {
         if (_currencyCode == null && _currencySymbol == null)
         {
             return;
         }
 
         boolean useCurrencyCode;
         if (JAVA_VERSION_14)
         {
             useCurrencyCode = _currencyCode != null;
         }
         else
         {
             useCurrencyCode = _currencySymbol == null;
         }
 
         if (useCurrencyCode)
         {
             // set Currency
             try
             {
                 format.setCurrency(Currency.getInstance(_currencyCode));
             }
             catch (Exception e)
             {
                 throw new ConverterException("Unable to get Currency instance for currencyCode " +
                                              _currencyCode);
             }
         }
         else if (format instanceof DecimalFormat)
 
         {
             DecimalFormat dFormat = (DecimalFormat)format;
             DecimalFormatSymbols symbols = dFormat.getDecimalFormatSymbols();
             symbols.setCurrencySymbol(_currencySymbol);
             dFormat.setDecimalFormatSymbols(symbols);
         }
     }
 
     // STATE SAVE/RESTORE
     public void _restoreState(FacesContext facesContext, Object state)
     {
         Object values[] = (Object[])state;
         _currencyCode = (String)values[0];
         _currencySymbol = (String)values[1];
         _locale = (Locale)values[2];
         Integer value = (Integer)values[3];
         _maxFractionDigits = value != null ? value.intValue() : 0;
         value = (Integer)values[4];
         _maxIntegerDigits = value != null ? value.intValue() : 0;
         value = (Integer)values[5];
         _minFractionDigits = value != null ? value.intValue() : 0;
         value = (Integer)values[6];
         _minIntegerDigits = value != null ? value.intValue() : 0;
         _pattern = (String)values[7];
         _type = (String)values[8];
         _groupingUsed = ((Boolean)values[9]).booleanValue();
         _integerOnly = ((Boolean)values[10]).booleanValue();
         _maxFractionDigitsSet = ((Boolean)values[11]).booleanValue();
         _maxIntegerDigitsSet = ((Boolean)values[12]).booleanValue();
         _minFractionDigitsSet = ((Boolean)values[13]).booleanValue();
         _minIntegerDigitsSet = ((Boolean)values[14]).booleanValue();
     }
 
     public Object _saveState(FacesContext facesContext)
     {
         Object values[] = new Object[15];
         values[0] = _currencyCode;
         values[1] = _currencySymbol;
         values[2] = _locale;
         values[3] = _maxFractionDigitsSet ? Integer.valueOf(_maxFractionDigits) : null;
         values[4] = _maxIntegerDigitsSet ? Integer.valueOf(_maxIntegerDigits) : null;
         values[5] = _minFractionDigitsSet ? Integer.valueOf(_minFractionDigits) : null;
         values[6] = _minIntegerDigitsSet ? Integer.valueOf(_minIntegerDigits) : null;
         values[7] = _pattern;
         values[8] = _type;
         values[9] = _groupingUsed ? Boolean.TRUE : Boolean.FALSE;
         values[10] = _integerOnly ? Boolean.TRUE : Boolean.FALSE;
         values[11] = _maxFractionDigitsSet ? Boolean.TRUE : Boolean.FALSE;
         values[12] = _maxIntegerDigitsSet ? Boolean.TRUE : Boolean.FALSE;
         values[13] = _minFractionDigitsSet ? Boolean.TRUE : Boolean.FALSE;
         values[14] = _minIntegerDigitsSet ? Boolean.TRUE : Boolean.FALSE;
         return values;
     }
 
     // GETTER & SETTER
     
     /**
      * ISO 4217 currency code
      * 
      * @JSFProperty
      */
     public String getCurrencyCode()
     {
         return _currencyCode != null ?
                _currencyCode :
                getDecimalFormatSymbols().getInternationalCurrencySymbol();
     }
 
     public void setCurrencyCode(String currencyCode)
     {
         _currencyCode = currencyCode;
     }
 
     /**
      * The currency symbol used to format a currency value. 
      * 
      * Defaults to the currency symbol for locale.
      * 
      * @JSFProperty
      */
     public String getCurrencySymbol()
     {
         return _currencySymbol != null ?
                _currencySymbol :
                getDecimalFormatSymbols().getCurrencySymbol();
     }
 
     public void setCurrencySymbol(String currencySymbol)
     {
         _currencySymbol = currencySymbol;
     }
 
     /**
      * Specifies whether output will contain grouping separators. 
      * 
      * Default: true.
      * 
      * @JSFProperty
      */
     public boolean isGroupingUsed()
     {
         return _groupingUsed;
     }
 
     public void setGroupingUsed(boolean groupingUsed)
     {
         _groupingUsed = groupingUsed;
     }
 
     /**
      * Specifies whether only the integer part of the input will be parsed. 
      * 
      * Default: false.
      * 
      * @JSFProperty
      */
     public boolean isIntegerOnly()
     {
         return _integerOnly;
     }
 
     public void setIntegerOnly(boolean integerOnly)
     {
         _integerOnly = integerOnly;
     }
 
     /**
      * The name of the locale to be used, instead of the default as specified 
      * in the faces configuration file.
      * 
      * @JSFProperty
      */
     public Locale getLocale()
     {
         if (_locale != null) return _locale;
         FacesContext context = FacesContext.getCurrentInstance();
         return context.getViewRoot().getLocale();
     }
 
     public void setLocale(Locale locale)
     {
         _locale = locale;
     }
 
     /**
      * The maximum number of digits in the fractional portion of the number.
      * 
      * @JSFProperty
      */
     public int getMaxFractionDigits()
     {
         return _maxFractionDigits;
     }
 
     public void setMaxFractionDigits(int maxFractionDigits)
     {
         _maxFractionDigitsSet = true;
         _maxFractionDigits = maxFractionDigits;
     }
 
     /**
      * The maximum number of digits in the integer portion of the number.
      * 
      * @JSFProperty
      */
     public int getMaxIntegerDigits()
     {
         return _maxIntegerDigits;
     }
 
     public void setMaxIntegerDigits(int maxIntegerDigits)
     {
         _maxIntegerDigitsSet = true;
         _maxIntegerDigits = maxIntegerDigits;
     }
 
     /**
      * The minimum number of digits in the fractional portion of the number.
      * 
      * @JSFProperty
      */
     public int getMinFractionDigits()
     {
         return _minFractionDigits;
     }
 
     public void setMinFractionDigits(int minFractionDigits)
     {
         _minFractionDigitsSet = true;
         _minFractionDigits = minFractionDigits;
     }
 
     /**
      * The minimum number of digits in the integer portion of the number.
      * 
      * @JSFProperty
      */
     public int getMinIntegerDigits()
     {
         return _minIntegerDigits;
     }
 
     public void setMinIntegerDigits(int minIntegerDigits)
     {
         _minIntegerDigitsSet = true;
         _minIntegerDigits = minIntegerDigits;
     }
 
     /**
      * A custom Date formatting pattern, in the format used by java.text.SimpleDateFormat.
      * 
      * @JSFProperty
      */
     public String getPattern()
     {
         return _pattern;
     }
 
     public void setPattern(String pattern)
     {
         _pattern = pattern;
     }
 
     public boolean isTransient()
     {
         return _transient;
     }
 
     public void setTransient(boolean aTransient)
     {
         _transient = aTransient;
     }
 
     /**
      * The type of formatting/parsing to be performed. 
      * 
      * Values include: number, currency, and percentage. Default: number.
      * 
      * @JSFProperty
      */
     public String getType()
     {
         return _type;
     }
 
     public void setType(String type)
     {
         //TODO: validate type
         _type = type;
     }
 
     private static boolean checkJavaVersion14()
     {
         String version = System.getProperty("java.version");
         if (version == null)
         {
             return false;
         }
         byte java14 = 0;
         for (int idx = version.indexOf('.'), i = 0; idx > 0 || version != null; i++)
         {
             if (idx > 0)
             {
                 byte value = Byte.parseByte(version.substring(0, 1));
                 version = version.substring(idx + 1, version.length());
                 idx = version.indexOf('.');
                 switch (i)
                 {
                     case 0:
                         if (value == 1)
                         {
                             java14 = 1;
                             break;
                         }
                         else if (value > 1)
                         {
                             java14 = 2;
                         }
                     case 1:
                         if (java14 > 0 && value >= 4)
                         {
                             java14 = 2;
                         }
                         ;
                     default:
                         idx = 0;
                         version = null;
                         break;
                 }
             }
             else
             {
                 byte value = Byte.parseByte(version.substring(0, 1));
                 if (java14 > 0 && value >= 4)
                 {
                     java14 = 2;
                 }
                 break;
             }
         }
         return java14 == 2;
     }
 
 
     private DecimalFormatSymbols getDecimalFormatSymbols()
     {
         return new DecimalFormatSymbols(getLocale());
     }
 }