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(function($, undefined) {
    function isOverAxis(x, reference, size) {
        return (x > reference) && (x < (reference + size));
    }

    function isFloating(item) {
        return (/left|right/).test(item.css("float")) || (/inline|table-cell/).test(item.css("display"));
    }
    $.widget("ui.nextendSortable", $.ui.sortable, {
        _create: function() {
            $.ui.sortable.prototype._create.apply(this, arguments);
            $.data(this.element[0], 'ui-sortable', this);
        },
        _intersectsWith: function(item) {
            var pos = $.ui.sortable.prototype._intersectsWith.apply(this, arguments);

            return pos;
        },
        _contactContainers: function(event) {
            var i, j, dist, itemWithLeastDistance, posProperty, sizeProperty, base, cur, nearBottom, floating,
                    innermostContainer = null,
                    innermostIndex = null;

            // get innermost container that intersects with item
            for (i = this.containers.length - 1; i >= 0; i--) {

                // never consider a container that's located within the item itself
                if ($.contains(this.currentItem[0], this.containers[i].element[0])) {
                    continue;
                }

                if (this._intersectsWith(this.containers[i].containerCache)) {

                    // if we've already found a container and it's more "inner" than this, then continue
                    //if (innermostContainer && $.contains(this.containers[i].element[0], innermostContainer.element[0])) {
                    if (innermostContainer && parseInt(this.containers[i].element.css('zIndex')) < parseInt(innermostContainer.element.css('zIndex'))) {
                        continue;
                    }

                    innermostContainer = this.containers[i];
                    innermostIndex = i;

                } else {
                    // container doesn't intersect. trigger "out" event if necessary
                    if (this.containers[i].containerCache.over) {
                        this.containers[i]._trigger("out", event, this._uiHash(this));
                        this.containers[i].containerCache.over = 0;
                    }
                }
            }
            // if no intersecting containers found, return
            if (!innermostContainer) {
                return;
            }
            if(typeof event.processed == 'undefined' && innermostContainer != window.dummySortable){
                event.processed = true;
            }else{
                innermostContainer = window.dummySortable;
                innermostIndex = this.containers.indexOf(innermostContainer);
                
            }

            // move the item into the container if it's not there already
            if (this.containers.length === 1) {
                if (!this.containers[innermostIndex].containerCache.over) {
                    this.containers[innermostIndex]._trigger("over", event, this._uiHash(this));
                    this.containers[innermostIndex].containerCache.over = 1;
                }
            } else {

                //When entering a new container, we will find the item with the least distance and append our item near it
                dist = 10000;
                itemWithLeastDistance = null;
                floating = innermostContainer.floating || isFloating(this.currentItem);
                posProperty = floating ? "left" : "top";
                sizeProperty = floating ? "width" : "height";
                base = this.positionAbs[posProperty] + this.offset.click[posProperty];
                for (j = this.items.length - 1; j >= 0; j--) {
                    if (!$.contains(this.containers[innermostIndex].element[0], this.items[j].item[0])) {
                        continue;
                    }
                    if (this.items[j].item[0] === this.currentItem[0]) {
                        continue;
                    }
                    if (floating && !isOverAxis(this.positionAbs.top + this.offset.click.top, this.items[j].top, this.items[j].height)) {
                        continue;
                    }
                    cur = this.items[j].item.offset()[posProperty];
                    nearBottom = false;
                    if (Math.abs(cur - base) > Math.abs(cur + this.items[j][sizeProperty] - base)) {
                        nearBottom = true;
                        cur += this.items[j][sizeProperty];
                    }

                    if (Math.abs(cur - base) < dist) {
                        dist = Math.abs(cur - base);
                        itemWithLeastDistance = this.items[j];
                        this.direction = nearBottom ? "up" : "down";
                    }
                }

                //Check if dropOnEmpty is enabled
                if (!itemWithLeastDistance && !this.options.dropOnEmpty) {
                    return;
                }

                if (this.currentContainer === this.containers[innermostIndex]) {
                    return;
                }
                itemWithLeastDistance ? this._rearrange(event, itemWithLeastDistance, null, true) : this._rearrange(event, null, this.containers[innermostIndex].element, true);


                this._trigger("change", event, this._uiHash());
                this.containers[innermostIndex]._trigger("change", event, this._uiHash(this));

                this.currentContainer = this.containers[innermostIndex];

                //Update the placeholder
                this.options.placeholder.update(this.currentContainer, this.placeholder);

                this.containers[innermostIndex]._trigger("over", event, this._uiHash(this));
                this.containers[innermostIndex].containerCache.over = 1;
            }


        }
    });
})(njQuery);