define(['jquery','underscore'], function(jQuery,_){
/*
 * *** MODIFIED VERSION ***
 *
 * HTML5 Sortable jQuery Plugin
 * http://farhadi.ir/projects/html5sortable
 *
 * Copyright 2012, Ali Farhadi
 * Released under the MIT license.
 */
(function($) {
var dragging, placeholders = $();
$.fn.sortable5 = function(options) {
	var method = String(options);
	options = $.extend({
		connectWith: false
	}, options);
	return this.each(function() {
		if (/^enable|disable|destroy$/.test(method)) {
			var items = $(this).children($(this).data('items')).attr('draggable', method == 'enable');
			if (method == 'destroy') {
				items.add(this).removeData('connectWith items').removeAttr('draggable')
					.off('dragstart.h5s dragend.h5s selectstart.h5s dragover.h5s dragenter.h5s drop.h5s');
			}
			return;
		}
		var isHandle, index, items = $(this).children(options.items), placeholderFactory = options.placeholder, that = this;

        if(_.isString(placeholderFactory)) {
            placeholderFactory ={
                element: function(){
                    return $('<' + (/^ul|ol$/i.test(that.tagName) ? 'li' : 'div') + ' class="sortable-placeholder"><div class="dashboard-panel"></div></div>');
                },
                update: function(ct, item) {

                }
            };
        }

		var placeholder = placeholderFactory.element();
		items.find(options.handle).mousedown(function() {
			isHandle = true;
		}).mouseup(function() {
			isHandle = false;
		});
		$(this).data('items', options.items);
		placeholders = placeholders.add(placeholder);
		if (options.connectWith) {
			$(options.connectWith).add(this).data('connectWith', options.connectWith);
		}
		items.attr('draggable', 'true').on('dragstart.h5s', function(e) {
			if (options.handle && !isHandle) {
				return false;
			}
			isHandle = false;
			var dt = e.originalEvent.dataTransfer;
			dt.effectAllowed = 'move';
			dt.setData('Text', 'dummy');
			index = (dragging = $(this)).addClass('sortable-dragging').index();
		}).on('dragend.h5s', function() {
			if (!dragging) {
				return;
			}
			dragging.removeClass('sortable-dragging').show();
			placeholders.detach();
			//if (index != dragging.index()) {
				dragging.parent().trigger('sortupdate', {item: dragging});
			//}
			dragging = null;
		}).not('a[href], img').on('selectstart.h5s', function() {
			this.dragDrop && this.dragDrop();
			return false;
		}).end().add([this, placeholder]).on('dragover.h5s dragenter.h5s drop.h5s', function(e) {
			if (!items.is(dragging) && options.connectWith !== $(dragging).parent().data('connectWith')) {
				return true;
			}
			if (e.type == 'drop') {
				e.stopPropagation();
				var p = placeholders.filter(':visible').after(dragging);
                placeholderFactory.update(null, p);
				dragging.trigger('dragend.h5s');
				return false;
			}
			e.preventDefault();
			e.originalEvent.dataTransfer.dropEffect = 'move';
			if (items.is(this)) {
				if (options.forcePlaceholderSize) {
					placeholder.height(dragging.outerHeight());
				}
				dragging.hide();
				$(this)[placeholder.index() < $(this).index() ? 'after' : 'before'](placeholder);
				placeholders.not(placeholder).detach();
                placeholderFactory.update(null, placeholder);
                dragging.trigger('sort');
			} else if (!placeholders.is(this) && !$(this).children(options.items).length) {
				placeholders.detach();
				$(this).append(placeholder);
                placeholderFactory.update(null, placeholder);
                dragging.trigger('sort');
			}
			return false;
		});
	});
};
})(jQuery);

});