/*
* @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	

    }
});