/*
* @Copyright (c) 2010 Ricardo Andrietta Mendes - eng.rmendes@gmail.com
* 
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
* 
* How to use it:
* var formated_value = $().number_format(final_value);
* 
* Advanced:
* var formated_value = $().number_format(final_value, 
*                                                     {
*                                                     numberOfDecimals:3,
*                                                     decimalSeparator: '.',
*                                                     thousandSeparator: ',',
*                                                     symbol: 'R$'
*                                                     });
*/
//indica que est� sendo criado um plugin
jQuery.fn.extend({ //indica que est� sendo criado um plugin
    
    number_format: function(numero, params) //indica o nome do plugin que ser� criado com os parametros a serem informados
        { 
        //parametros default
        var sDefaults = 
            {            
            numberOfDecimals: 2,
            decimalSeparator: ',',
            thousandSeparator: '.',
            symbol: ''
            }
 
        //fun��o do jquery que substitui os parametros que n�o foram informados pelos defaults
        var options = jQuery.extend(sDefaults, params);

        //CORPO DO PLUGIN
        var number = numero; 
        var decimals = options.numberOfDecimals;
        var dec_point = options.decimalSeparator;
        var thousands_sep = options.thousandSeparator;
        var currencySymbol = options.symbol;
        
        var exponent = "";
        var numberstr = number.toString ();
        var eindex = numberstr.indexOf ("e");
        if (eindex > -1)
        {
        exponent = numberstr.substring (eindex);
        number = parseFloat (numberstr.substring (0, eindex));
        }
        
        if (decimals != null)
        {
        var temp = Math.pow (10, decimals);
        number = Math.round (number * temp) / temp;
        }
        var sign = number < 0 ? "-" : "";
        var integer = (number > 0 ? 
          Math.floor (number) : Math.abs (Math.ceil (number))).toString ();
        
        var fractional = number.toString ().substring (integer.length + sign.length);
        dec_point = dec_point != null ? dec_point : ".";
        fractional = decimals != null && decimals > 0 || fractional.length > 1 ? 
                   (dec_point + fractional.substring (1)) : "";
        if (decimals != null && decimals > 0)
        {
        for (i = fractional.length - 1, z = decimals; i < z; ++i)
          fractional += "0";
        }
        
        thousands_sep = (thousands_sep != dec_point || fractional.length == 0) ? 
                      thousands_sep : null;
        if (thousands_sep != null && thousands_sep != "")
        {
        for (i = integer.length - 3; i > 0; i -= 3)
          integer = integer.substring (0 , i) + thousands_sep + integer.substring (i);
        }
        
        if (options.symbol == '')
        {
        return sign + integer + fractional + exponent;
        }
        else
        {
        return currencySymbol + ' ' + sign + integer + fractional + exponent;
        }
        //FIM DO CORPO DO PLUGIN    
        
    }
});