(function (factory) {

    if (typeof define === 'function' && define.amd) {
        define(['jquery'], factory);
    } else if (typeof exports === 'object') {
        module.exports = factory(require('jquery'));
    } else {
        factory(jQuery || Zepto);
    }

}(function($) {

    $.fn.maskNumber = function(options) {

        var settings = $.extend({}, $.fn.maskNumber.defaults, options);
        settings = $.extend(settings, options);
        settings = $.extend(settings, this.data());

        this.keyup(function() {
            format(this, settings);
        });
        
        return this;
    };

    $.fn.maskNumber.defaults = {
        thousands: ",",
        decimal: ".",
        integer: false,
        allowNegative: false
    };

    function format(input, settings) {
        var inputValue = input.value;
        inputValue = removeNonDigits(inputValue, settings.allowNegative);
        if (!settings.integer) {
            inputValue = addDecimalSeparator(inputValue);
        }
        inputValue = addThousandSeparator(inputValue, settings);
        inputValue = removeLeftZeros(inputValue);
        applyNewValue(input, inputValue);
    }
    
    function removeNonDigits(value, allowNegative) {
        return ((allowNegative && value[0] === "-") ? "-" : "") + value.replace(/\D/g, "");
    }
    
    function addDecimalSeparator(value, settings) {
        value = value.replace(/(\d{2})$/, settings.decimal.concat("$1"));
        value = value.replace(/(\d+)(\d{3}, \d{2})$/g, "$1".concat(settings.thousands).concat("$2"));
        return value;
    }
    
    function addThousandSeparator(value, settings) {
        var totalThousandsPoints = (value.length - 3) / 3;
        var thousandsPointsAdded = 0;
        while (totalThousandsPoints > thousandsPointsAdded) {
            thousandsPointsAdded++;
            value = value.replace(/(\d+)(\d{3}.*)/, "$1".concat(settings.thousands).concat("$2"));
        }
        
        return value;
    }
    
    function removeLeftZeros(value) {
        return value.replace(/^(0)(\d)/g,"$2");
    }
    
    function applyNewValue(input, newValue) {
        if (input.value != newValue) {
            input.value = newValue;
        }
        $(input).trigger('change', input.value);
    }

}));