(function(factory) {
    "use strict";
    var sortable,
        jq,
        _this = this;

    if (typeof define === "function" && define.amd) {
        try {
            define(["sortablejs", "jquery"], function(Sortable, $) {
                sortable = Sortable;
                jq = $;
                checkErrors();
                factory(Sortable, $);
            });
        } catch (err) {
            checkErrors();
        }
        return;
    } else if (typeof exports === 'object') {
        try {
            sortable = require('sortablejs');
            jq = require('jquery');
        } catch (err) {}
    }

    if (typeof jQuery === 'function' || typeof $ === 'function') {
        jq = jQuery || $;
    }

    if (typeof Sortable !== 'undefined') {
        sortable = Sortable;
    }

    function checkErrors() {
        if (!jq) {
            throw new Error('jQuery is required for jquery-sortablejs');
        }

        if (!sortable) {
            throw new Error('SortableJS is required for jquery-sortablejs (https://github.com/SortableJS/Sortable)');
        }
    }
    checkErrors();
    factory(sortable, jq);
})(function(Sortable, $) {
    "use strict";

    $.fn.sortableJS = function(options) {
        var retVal,
            args = arguments;

        this.each(function() {
            var $el = $(this),
                sortable = $el.data('sortable');

            if (!sortable && (options instanceof Object || !options)) {
                sortable = new Sortable(this, options);
                $el.data('sortable', sortable);
            } else if (sortable) {
                if (options === 'destroy') {
                    sortable.destroy();
                    $el.removeData('sortable');
                } else if (options === 'widget') {
                    retVal = sortable;
                } else if (typeof sortable[options] === 'function') {
                    retVal = sortable[options].apply(sortable, [].slice.call(args, 1));
                } else if (options in sortable.options) {
                    retVal = sortable.option.apply(sortable, args);
                }
            }
        });

        return (retVal === void 0) ? this : retVal;
    };
});