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

    /**

     * Provides the ability to create a Drop Target.

     * @module dd

     * @submodule dd-drop

     */

    /**

     * Provides the ability to create a Drop Target.

     * @class Drop

     * @extends Base

     * @constructor

     * @namespace DD

     */

    var NODE = 'node',

        DDM = Y.DD.DDM,

        OFFSET_HEIGHT = 'offsetHeight',

        OFFSET_WIDTH = 'offsetWidth',

        /**

        * Fires when a drag element is over this target.

        * @event drop:over

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>drop</dt><dd>The drop object at the time of the event.</dd>

        * <dt>drag</dt><dd>The drag object at the time of the event.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_DROP_OVER = 'drop:over',

        /**

        * Fires when a drag element enters this target.

        * @event drop:enter

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>drop</dt><dd>The drop object at the time of the event.</dd>

        * <dt>drag</dt><dd>The drag object at the time of the event.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_DROP_ENTER = 'drop:enter',

        /**

        * Fires when a drag element exits this target.

        * @event drop:exit

        * @param {EventFacade} event An Event Facade object

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_DROP_EXIT = 'drop:exit',

        /**

        * Fires when a draggable node is dropped on this Drop Target. (Fired from dd-ddm-drop)

        * @event drop:hit

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>drop</dt><dd>The best guess on what was dropped on.</dd>

        * <dt>drag</dt><dd>The drag object at the time of the event.</dd>

        * <dt>others</dt><dd>An array of all the other drop targets that was dropped on.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

    Drop = function() {

        this._lazyAddAttrs = false;

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

        //DD init speed up.

        Y.on('domready', Y.bind(function() {

            Y.later(100, this, this._createShim);

        }, this));

        DDM._regTarget(this);

        /* TODO

        if (Dom.getStyle(this.el, 'position') == 'fixed') {

            Event.on(window, 'scroll', function() {

                this.activateShim();

            }, this, true);

        }

        */

    };

    Drop.NAME = 'drop';

    Drop.ATTRS = {

        /**

        * Y.Node instance to use as the element to make a Drop Target

        * @attribute node

        * @type Node

        */

        node: {

            setter: function(node) {

                var n = Y.one(node);

                if (!n) {

                    Y.error('DD.Drop: Invalid Node Given: ' + node);

                }

                return n;

            }

        },

        /**

        * Array of groups to add this drop into.

        * @attribute groups

        * @type Array

        */

        groups: {

            value: ['default'],

            getter: function() {

                if (!this._groups) {

                    this._groups = {};

                    return [];

                }

                return Y.Object.keys(this._groups);

            },

            setter: function(g) {

                this._groups = Y.Array.hash(g);

                return g;

            }

        },

        /**

        * CSS style padding to make the Drop Target bigger than the node.

        * @attribute padding

        * @type String

        */

        padding: {

            value: '0',

            setter: function(p) {

                return DDM.cssSizestoObject(p);

            }

        },

        /**

        * Set to lock this drop element.

        * @attribute lock

        * @type Boolean

        */

        lock: {

            value: false,

            setter: function(lock) {

                if (lock) {

                    this.get(NODE).addClass(DDM.CSS_PREFIX + '-drop-locked');

                } else {

                    this.get(NODE).removeClass(DDM.CSS_PREFIX + '-drop-locked');

                }

                return lock;

            }

        },

        /**

        * Controls the default bubble parent for this Drop instance. Default: Y.DD.DDM. Set to false to disable bubbling.

        * Use bubbleTargets in config.

        * @deprecated

        * @attribute bubbles

        * @type Object

        */

        bubbles: {

            setter: function(t) {

                this.addTarget(t);

                return t;

            }

        },

        /**

        * Use the Drop shim. Default: true

        * @deprecated

        * @attribute useShim

        * @type Boolean

        */

        useShim: {

            value: true,

            setter: function(v) {

                Y.DD.DDM._noShim = !v;

                return v;

            }

        }

    };

    Y.extend(Drop, Y.Base, {

        /**

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

        * @private

        * @property _bubbleTargets

        */

        _bubbleTargets: Y.DD.DDM,

        /**

        * Add this Drop instance to a group, this should be used for on-the-fly group additions.

        * @method addToGroup

        * @param {String} g The group to add this Drop Instance to.

        * @chainable

        */

        addToGroup: function(g) {

            this._groups[g] = true;

            return this;

        },

        /**

        * Remove this Drop instance from a group, this should be used for on-the-fly group removals.

        * @method removeFromGroup

        * @param {String} g The group to remove this Drop Instance from.

        * @chainable

        */

        removeFromGroup: function(g) {

            delete this._groups[g];

            return this;

        },

        /**

        * This method creates all the events for this Event Target and publishes them so we get Event Bubbling.

        * @private

        * @method _createEvents

        */

        _createEvents: function() {

            var ev = [

                EV_DROP_OVER,

                EV_DROP_ENTER,

                EV_DROP_EXIT,

                'drop:hit'

            ];

            Y.Array.each(ev, function(v) {

                this.publish(v, {

                    type: v,

                    emitFacade: true,

                    preventable: false,

                    bubbles: true,

                    queuable: false,

                    prefix: 'drop'

                });

            }, this);

        },

        /**

        * Flag for determining if the target is valid in this operation.

        * @private

        * @property _valid

        * @type Boolean

        */

        _valid: null,

        /**

        * The groups this target belongs to.

        * @private

        * @property _groups

        * @type Array

        */

        _groups: null,

        /**

        * Node reference to the targets shim

        * @property shim

        * @type {Object}

        */

        shim: null,

        /**

        * A region object associated with this target, used for checking regions while dragging.

        * @property region

        * @type Object

        */

        region: null,

        /**

        * This flag is tripped when a drag element is over this target.

        * @property overTarget

        * @type Boolean

        */

        overTarget: null,

        /**

        * Check if this target is in one of the supplied groups.

        * @method inGroup

        * @param {Array} groups The groups to check against

        * @return Boolean

        */

        inGroup: function(groups) {

            this._valid = false;

            var ret = false;

            Y.Array.each(groups, function(v) {

                if (this._groups[v]) {

                    ret = true;

                    this._valid = true;

                }

            }, this);

            return ret;

        },

        /**

        * Private lifecycle method

        * @private

        * @method initializer

        */

        initializer: function() {

            Y.later(100, this, this._createEvents);

            var node = this.get(NODE), id;

            if (!node.get('id')) {

                id = Y.stamp(node);

                node.set('id', id);

            }

            node.addClass(DDM.CSS_PREFIX + '-drop');

            //Shouldn't have to do this..

            this.set('groups', this.get('groups'));

        },

        /**

        * Lifecycle destructor, unreg the drag from the DDM and remove listeners

        * @private

        * @method destructor

        */

        destructor: function() {

            DDM._unregTarget(this);

            if (this.shim && (this.shim !== this.get(NODE))) {

                this.shim.detachAll();

                this.shim.remove();

                this.shim = null;

            }

            this.get(NODE).removeClass(DDM.CSS_PREFIX + '-drop');

            this.detachAll();

        },

        /**

        * Removes classes from the target, resets some flags and sets the shims deactive position [-999, -999]

        * @private

        * @method _deactivateShim

        */

        _deactivateShim: function() {

            if (!this.shim) {

                return false;

            }

            this.get(NODE).removeClass(DDM.CSS_PREFIX + '-drop-active-valid');

            this.get(NODE).removeClass(DDM.CSS_PREFIX + '-drop-active-invalid');

            this.get(NODE).removeClass(DDM.CSS_PREFIX + '-drop-over');

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

                this.shim.setStyles({

                    top: '-999px',

                    left: '-999px',

                    zIndex: '1'

                });

            }

            this.overTarget = false;

        },

        /**

        * Activates the shim and adds some interaction CSS classes

        * @private

        * @method _activateShim

        */

        _activateShim: function() {

            if (!DDM.activeDrag) {

                return false; //Nothing is dragging, no reason to activate.

            }

            if (this.get(NODE) === DDM.activeDrag.get(NODE)) {

                return false;

            }

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

                return false;

            }

            var node = this.get(NODE);

            //TODO Visibility Check..

            //if (this.inGroup(DDM.activeDrag.get('groups')) && this.get(NODE).isVisible()) {

            if (this.inGroup(DDM.activeDrag.get('groups'))) {

                node.removeClass(DDM.CSS_PREFIX + '-drop-active-invalid');

                node.addClass(DDM.CSS_PREFIX + '-drop-active-valid');

                DDM._addValid(this);

                this.overTarget = false;

                if (!this.get('useShim')) {

                    this.shim = this.get(NODE);

                }

                this.sizeShim();

            } else {

                DDM._removeValid(this);

                node.removeClass(DDM.CSS_PREFIX + '-drop-active-valid');

                node.addClass(DDM.CSS_PREFIX + '-drop-active-invalid');

            }

        },

        /**

        * Positions and sizes the shim with the raw data from the node,

        * this can be used to programatically adjust the Targets shim for Animation..

        * @method sizeShim

        */

        sizeShim: function() {

            if (!DDM.activeDrag) {

                return false; //Nothing is dragging, no reason to activate.

            }

            if (this.get(NODE) === DDM.activeDrag.get(NODE)) {

                return false;

            }

            //if (this.get('lock') || !this.get('useShim')) {

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

                return false;

            }

            if (!this.shim) {

                Y.later(100, this, this.sizeShim);

                return false;

            }

            var node = this.get(NODE),

                nh = node.get(OFFSET_HEIGHT),

                nw = node.get(OFFSET_WIDTH),

                xy = node.getXY(),

                p = this.get('padding'),

                dd, dH, dW;

            //Apply padding

            nw = nw + p.left + p.right;

            nh = nh + p.top + p.bottom;

            xy[0] = xy[0] - p.left;

            xy[1] = xy[1] - p.top;

            if (DDM.activeDrag.get('dragMode') === DDM.INTERSECT) {

                //Intersect Mode, make the shim bigger

                dd = DDM.activeDrag;

                dH = dd.get(NODE).get(OFFSET_HEIGHT);

                dW = dd.get(NODE).get(OFFSET_WIDTH);

                nh = (nh + dH);

                nw = (nw + dW);

                xy[0] = xy[0] - (dW - dd.deltaXY[0]);

                xy[1] = xy[1] - (dH - dd.deltaXY[1]);

            }

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

                //Set the style on the shim

                this.shim.setStyles({

                    height: nh + 'px',

                    width: nw + 'px',

                    top: xy[1] + 'px',

                    left: xy[0] + 'px'

                });

            }

            //Create the region to be used by intersect when a drag node is over us.

            this.region = {

                '0': xy[0],

                '1': xy[1],

                area: 0,

                top: xy[1],

                right: xy[0] + nw,

                bottom: xy[1] + nh,

                left: xy[0]

            };

        },

        /**

        * Creates the Target shim and adds it to the DDM's playground..

        * @private

        * @method _createShim

        */

        _createShim: function() {

            //No playground, defer

            if (!DDM._pg) {

                Y.later(10, this, this._createShim);

                return;

            }

            //Shim already here, cancel

            if (this.shim) {

                return;

            }

            var s = this.get('node');

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

                s = Y.Node.create('<div id="' + this.get(NODE).get('id') + '_shim"></div>');

                s.setStyles({

                    height: this.get(NODE).get(OFFSET_HEIGHT) + 'px',

                    width: this.get(NODE).get(OFFSET_WIDTH) + 'px',

                    backgroundColor: 'yellow',

                    opacity: '.5',

                    zIndex: '1',

                    overflow: 'hidden',

                    top: '-900px',

                    left: '-900px',

                    position:  'absolute'

                });

                DDM._pg.appendChild(s);

                s.on('mouseover', Y.bind(this._handleOverEvent, this));

                s.on('mouseout', Y.bind(this._handleOutEvent, this));

            }

            this.shim = s;

        },

        /**

        * This handles the over target call made from this object or from the DDM

        * @private

        * @method _handleOverTarget

        */

        _handleTargetOver: function() {

            if (DDM.isOverTarget(this)) {

                this.get(NODE).addClass(DDM.CSS_PREFIX + '-drop-over');

                DDM.activeDrop = this;

                DDM.otherDrops[this] = this;

                if (this.overTarget) {

                    DDM.activeDrag.fire('drag:over', { drop: this, drag: DDM.activeDrag });

                    this.fire(EV_DROP_OVER, { drop: this, drag: DDM.activeDrag });

                } else {

                    //Prevent an enter before a start..

                    if (DDM.activeDrag.get('dragging')) {

                        this.overTarget = true;

                        this.fire(EV_DROP_ENTER, { drop: this, drag: DDM.activeDrag });

                        DDM.activeDrag.fire('drag:enter', { drop: this, drag: DDM.activeDrag });

                        DDM.activeDrag.get(NODE).addClass(DDM.CSS_PREFIX + '-drag-over');

                        //TODO - Is this needed??

                        //DDM._handleTargetOver();

                    }

                }

            } else {

                this._handleOut();

            }

        },

        /**

        * Handles the mouseover DOM event on the Target Shim

        * @private

        * @method _handleOverEvent

        */

        _handleOverEvent: function() {

            this.shim.setStyle('zIndex', '999');

            DDM._addActiveShim(this);

        },

        /**

        * Handles the mouseout DOM event on the Target Shim

        * @private

        * @method _handleOutEvent

        */

        _handleOutEvent: function() {

            this.shim.setStyle('zIndex', '1');

            DDM._removeActiveShim(this);

        },

        /**

        * Handles out of target calls/checks

        * @private

        * @method _handleOut

        */

        _handleOut: function(force) {

            if (!DDM.isOverTarget(this) || force) {

                if (this.overTarget) {

                    this.overTarget = false;

                    if (!force) {

                        DDM._removeActiveShim(this);

                    }

                    if (DDM.activeDrag) {

                        this.get(NODE).removeClass(DDM.CSS_PREFIX + '-drop-over');

                        DDM.activeDrag.get(NODE).removeClass(DDM.CSS_PREFIX + '-drag-over');

                        this.fire(EV_DROP_EXIT, { drop: this, drag: DDM.activeDrag });

                        DDM.activeDrag.fire('drag:exit', { drop: this, drag: DDM.activeDrag });

                        delete DDM.otherDrops[this];

                    }

                }

            }

        }

    });

    Y.DD.Drop = Drop;

}, '3.18.1', {"requires": ["dd-drag", "dd-ddm-drop"]});