/*Autor: John Tsevdos , bajo licencia GPL http://www.gnu.org/licenses/gpl.html */

(function ($) {

    $.fn.nwrapper = function (options) {

        var defaults = {
            wrapEvery: 1,
            defaultClasses: true,
            extraClasses: false,
            htmlStructure: 'div'
        };

        settings = $.extend({}, defaults, options);

        var elements = $(this).children();
        var elementsLen = elements.length;

        for (var i = 0, numb = 1; i < elementsLen; i += settings.wrapEvery, numb++) {

            // Default Classes Array
            var classes = [];
            if (settings.defaultClasses) {

                classes[0] = 'slide';
                classes[1] = 'slide-' + numb;

                if (numb == 1) {
                    classes[2] = 'first';
                }

                if (numb == Math.ceil(elementsLen / settings.wrapEvery)) {
                    classes[2] = 'last';
                }

            }

            // Merge Default class with Extra Class
            if (settings.extraClasses) {
                $.merge(classes, settings.extraClasses);
            }

            // If you find any classes crete the class string
            if (classes.length > 0) {
                htmlClassesString = 'class="' + classes.join(" ") + '"';
            } else {
                htmlClassesString = '';
            }

            elements.filter(':eq(' + i + '), :lt(' + (i + settings.wrapEvery) + '):gt(' + i + ')').wrapAll('<' + settings.htmlStructure + ' ' + htmlClassesString + ' />');

        }

        return $(this);
    };

})(jQuery);