module.exports = function(){
    'use strict';

    var $ = this;

    $.fn.spinForPromise = function(promise){
        var self = this;
        if(!promise || promise.state() !== 'pending') {
            return this;
        }
        promise.always(function(){
            self.stopSpin();
        });
        return this.startSpin();
    };
    $.fn.startSpin = function(){
        var icon = this.find('i').andSelf('i');
        if(!icon || !icon.attr('class')) {
            return this;
        }
        var iconClasses = icon.attr('class').match(/(?:^|\s)icon\-.+?(?:$|\s)/);
        if(iconClasses.length === 0) {
            return this;
        }
        var iconClass = $.trim(iconClasses[0]);
        this.addClass('disabled');
        if(icon.hasClass('icon-can-spin')) {
            icon.addClass('icon-spin');
        }
        else {
            icon.attr('data-idle-icon', iconClass);
            icon.removeClass(iconClass);
            icon.addClass('icon-nd-spinner');
        }
        return this;
    };
    $.fn.stopSpin = function(){
        var icon = this.find('i').andSelf('i');
        this.removeClass('disabled');
        icon.removeClass('icon-spin icon-nd-spinner');
        var idleIcon = icon.attr('data-idle-icon');
        if(idleIcon) {
            icon.addClass(idleIcon);
        }
        return this;
    };
};