// number to string, pluginized from http://stackoverflow.com/questions/5529934/javascript-numbers-to-words

window.num2str = function (num) {
    return window.num2str.convert(num);
}

window.num2str.ones=['','one','two','three','four','five','six','seven','eight','nine'];
window.num2str.tens=['','','twenty','thirty','forty','fifty','sixty','seventy','eighty','ninety'];
window.num2str.teens=['ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen'];


window.num2str.convert_millions = function(num) {
    var varies = [1000000, " million ", this.convert_thousands]
    if (num >= varies[0]) {
        return this.convert_millions(Math.floor(num / varies[0])) + varies[1] + varies[2](num % varies[0]);
    }
    else {
        return varies[2](num);
    }
}

window.num2str.convert_thousands = function(num) {
    var varies = [1000, " thousand ", this.convert_hundreds]
    if (num >= varies[0]) {
        return this.convert_hundreds(Math.floor(num / varies[0])) + varies[1] + varies[2](num % varies[0]);
    }
    else {
        return varies[2](num);
    }
}

window.num2str.convert_hundreds = function(num) {
    var varies = [100, " hundred ", this.convert_tens]
    if (num >= varies[0]) {
        return this.ones[Math.floor(num / varies[0])] + varies[1] + varies[2](num % varies[0]);
    }
    else {
        return varies[2](num);
    }
}

window.num2str.convert_tens = function(num) {
    var varies = [10, " "]
    if (num < 10) return this.ones[num];
    else if (num >= 10 && num < 20) return this.teens[num - 10];
    else {
        return this.tens[Math.floor(num / 10)] + " " + this.ones[num % 10];
    }
}

window.num2str.convert = function(num) {
    if (num == 0) return "zero";
    else return this.convert_millions(num);
}