YUI.add('dd-delegate', function (Y, NAME) {

    /**

     * Provides the ability to drag multiple nodes under a container element using only one Y.DD.Drag instance as a delegate.

     * @module dd

     * @submodule dd-delegate

     */

    /**

     * Provides the ability to drag multiple nodes under a container element using only one Y.DD.Drag instance as a delegate.

     * @class Delegate

     * @extends Base

     * @constructor

     * @namespace DD

     */

    var Delegate = function() {

        Delegate.superclass.constructor.apply(this, arguments);

    },

    CONT = 'container',

    NODES = 'nodes',

    _tmpNode = Y.Node.create('<div>Temp Node</div>');

    Y.extend(Delegate, Y.Base, {

        /**

        * The default bubbleTarget for this object. Default: Y.DD.DDM

        * @private

        * @property _bubbleTargets

        */

        _bubbleTargets: Y.DD.DDM,

        /**

        * A reference to the temporary dd instance used under the hood.

        * @property dd

        */

        dd: null,

        /**

        * The state of the Y.DD.DDM._noShim property to it can be reset.

        * @property _shimState

        * @private

        */

        _shimState: null,

        /**

        * Array of event handles to be destroyed

        * @private

        * @property _handles

        */

        _handles: null,

        /**

        * Listens to the nodeChange event and sets the dragNode on the temp dd instance.

        * @private

        * @method _onNodeChange

        * @param {Event} e The Event.

        */

        _onNodeChange: function(e) {

            this.set('dragNode', e.newVal);

        },

        /**

        * Listens for the drag:end event and updates the temp dd instance.

        * @private

        * @method _afterDragEnd

        * @param {Event} e The Event.

        */

        _afterDragEnd: function() {

            Y.DD.DDM._noShim = this._shimState;

            this.set('lastNode', this.dd.get('node'));

            this.get('lastNode').removeClass(Y.DD.DDM.CSS_PREFIX + '-dragging');

            this.dd._unprep();

            this.dd.set('node', _tmpNode);

        },

        /**

        * The callback for the Y.DD.Delegate instance used

        * @private

        * @method _delMouseDown

        * @param {Event} e The MouseDown Event.

        */

        _delMouseDown: function(e) {

            var tar = e.currentTarget,

                dd = this.dd,

                dNode = tar,

                config = this.get('dragConfig');

            if (tar.test(this.get(NODES)) && !tar.test(this.get('invalid'))) {

                this._shimState = Y.DD.DDM._noShim;

                Y.DD.DDM._noShim = true;

                this.set('currentNode', tar);

                dd.set('node', tar);

                if (config && config.dragNode) {

                    dNode = config.dragNode;

                } else if (dd.proxy) {

                    dNode = Y.DD.DDM._proxy;

                }

                dd.set('dragNode', dNode);

                dd._prep();

                dd.fire('drag:mouseDown', { ev: e });

            }

        },

        /**

        * Sets the target shim state

        * @private

        * @method _onMouseEnter

        * @param {Event} e The MouseEnter Event

        */

        _onMouseEnter: function() {

            this._shimState = Y.DD.DDM._noShim;

            Y.DD.DDM._noShim = true;

        },

        /**

        * Resets the target shim state

        * @private

        * @method _onMouseLeave

        * @param {Event} e The MouseLeave Event

        */

        _onMouseLeave: function() {

            Y.DD.DDM._noShim = this._shimState;

        },

        initializer: function() {

            this._handles = [];

            //Create a tmp DD instance under the hood.

            //var conf = Y.clone(this.get('dragConfig') || {}),

            var conf = this.get('dragConfig') || {},

                cont = this.get(CONT);

            conf.node = _tmpNode.cloneNode(true);

            conf.bubbleTargets = this;

            if (this.get('handles')) {

                conf.handles = this.get('handles');

            }

            this.dd = new Y.DD.Drag(conf);

            //On end drag, detach the listeners

            this.dd.after('drag:end', Y.bind(this._afterDragEnd, this));

            this.dd.on('dragNodeChange', Y.bind(this._onNodeChange, this));

            this.dd.after('drag:mouseup', function() {

                this._unprep();

            });

            //Attach the delegate to the container

            this._handles.push(Y.delegate(Y.DD.Drag.START_EVENT, Y.bind(this._delMouseDown, this), cont, this.get(NODES)));

            this._handles.push(Y.on('mouseenter', Y.bind(this._onMouseEnter, this), cont));

            this._handles.push(Y.on('mouseleave', Y.bind(this._onMouseLeave, this), cont));

            Y.later(50, this, this.syncTargets);

            Y.DD.DDM.regDelegate(this);

        },

        /**

        * Applies the Y.Plugin.Drop to all nodes matching the cont + nodes selector query.

        * @method syncTargets

        * @chainable

        */

        syncTargets: function() {

            if (!Y.Plugin.Drop || this.get('destroyed')) {

                return;

            }

            var items, groups, config;

            if (this.get('target')) {

                items = Y.one(this.get(CONT)).all(this.get(NODES));

                groups = this.dd.get('groups');

                config = this.get('dragConfig');

                if (config && config.groups) {

                    groups = config.groups;

                }

                items.each(function(i) {

                    this.createDrop(i, groups);

                }, this);

            }

            return this;

        },

        /**

        * Apply the Drop plugin to this node

        * @method createDrop

        * @param {Node} node The Node to apply the plugin to

        * @param {Array} groups The default groups to assign this target to.

        * @return Node

        */

        createDrop: function(node, groups) {

            var config = {

                useShim: false,

                bubbleTargets: this

            };

            if (!node.drop) {

                node.plug(Y.Plugin.Drop, config);

            }

            node.drop.set('groups', groups);

            return node;

        },

        destructor: function() {

            if (this.dd) {

                this.dd.destroy();

            }

            if (Y.Plugin.Drop) {

                var targets = Y.one(this.get(CONT)).all(this.get(NODES));

                targets.unplug(Y.Plugin.Drop);

            }

            Y.Array.each(this._handles, function(v) {

                v.detach();

            });

        }

    }, {

        NAME: 'delegate',

        ATTRS: {

            /**

            * A selector query to get the container to listen for mousedown events on. All "nodes" should be a child of this container.

            * @attribute container

            * @type String

            */

            container: {

                value: 'body'

            },

            /**

            * A selector query to get the children of the "container" to make draggable elements from.

            * @attribute nodes

            * @type String

            */

            nodes: {

                value: '.dd-draggable'

            },

            /**

            * A selector query to test a node to see if it's an invalid item.

            * @attribute invalid

            * @type String

            */

            invalid: {

                value: 'input, select, button, a, textarea'

            },

            /**

            * Y.Node instance of the last item dragged.

            * @attribute lastNode

            * @type Node

            */

            lastNode: {

                value: _tmpNode

            },

            /**

            * Y.Node instance of the dd node.

            * @attribute currentNode

            * @type Node

            */

            currentNode: {

                value: _tmpNode

            },

            /**

            * Y.Node instance of the dd dragNode.

            * @attribute dragNode

            * @type Node

            */

            dragNode: {

                value: _tmpNode

            },

            /**

            * Is the mouse currently over the container

            * @attribute over

            * @type Boolean

            */

            over: {

                value: false

            },

            /**

            * Should the items also be a drop target.

            * @attribute target

            * @type Boolean

            */

            target: {

                value: false

            },

            /**

            * The default config to be used when creating the DD instance.

            * @attribute dragConfig

            * @type Object

            */

            dragConfig: {

                value: null

            },

            /**

            * The handles config option added to the temp DD instance.

            * @attribute handles

            * @type Array

            */

            handles: {

                value: null

            }

        }

    });

    Y.mix(Y.DD.DDM, {

        /**

        * Holder for all Y.DD.Delegate instances

        * @private

        * @for DDM

        * @property _delegates

        * @type Array

        */

        _delegates: [],

        /**

        * Register a Delegate with the DDM

        * @for DDM

        * @method regDelegate

        */

        regDelegate: function(del) {

            this._delegates.push(del);

        },

        /**

        * Get a delegate instance from a container node

        * @for DDM

        * @method getDelegate

        * @return Y.DD.Delegate

        */

        getDelegate: function(node) {

            var del = null;

            node = Y.one(node);

            Y.Array.each(this._delegates, function(v) {

                if (node.test(v.get(CONT))) {

                    del = v;

                }

            }, this);

            return del;

        }

    });

    Y.namespace('DD');

    Y.DD.Delegate = Delegate;

}, '@VERSION@', {"requires": ["dd-drag", "dd-drop-plugin", "event-mouseenter"]});