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YUI.add('widget-modality', function (Y, NAME) {

/**

 * Provides modality support for Widgets, though an extension

 *

 * @module widget-modality

 */

var WIDGET       = 'widget',

    RENDER_UI    = 'renderUI',

    BIND_UI      = 'bindUI',

    SYNC_UI      = 'syncUI',

    BOUNDING_BOX = 'boundingBox',

    VISIBLE      = 'visible',

    Z_INDEX      = 'zIndex',

    CHANGE       = 'Change',

    isBoolean    = Y.Lang.isBoolean,

    getCN        = Y.ClassNameManager.getClassName,

    MaskShow     = "maskShow",

    MaskHide     = "maskHide",

    ClickOutside = "clickoutside",

    FocusOutside = "focusoutside",

    supportsPosFixed = (function(){

        /*! IS_POSITION_FIXED_SUPPORTED - Juriy Zaytsev (kangax) - http://yura.thinkweb2.com/cft/ */

        var doc         = Y.config.doc,

            isSupported = null,

            el, root;

        if (doc.createElement) {

            el = doc.createElement('div');

            if (el && el.style) {

                el.style.position = 'fixed';

                el.style.top = '10px';

                root = doc.body;

                if (root && root.appendChild && root.removeChild) {

                    root.appendChild(el);

                    isSupported = (el.offsetTop === 10);

                    root.removeChild(el);

                }

            }

        }

        return isSupported;

    }());

    /**

     * Widget extension, which can be used to add modality support to the base Widget class,

     * through the Base.create method.

     *

     * @class WidgetModality

     * @param {Object} config User configuration object

     */

    function WidgetModal(config) {}

    var MODAL           = 'modal',

        MASK            = 'mask',

        MODAL_CLASSES   = {

            modal   : getCN(WIDGET, MODAL),

            mask    : getCN(WIDGET, MASK)

        };

    /**

    * Static property used to define the default attribute

    * configuration introduced by WidgetModality.

    *

    * @property ATTRS

    * @static

    * @type Object

    */

    WidgetModal.ATTRS = {

            /**

             * @attribute maskNode

             * @type Y.Node

             *

             * @description Returns a Y.Node instance of the node being used as the mask.

             */

            maskNode : {

                getter      : '_getMaskNode',

                readOnly    : true

            },

            /**

             * @attribute modal

             * @type boolean

             *

             * @description Whether the widget should be modal or not.

             */

            modal: {

                value:false,

                validator: isBoolean

            },

            /**

             * @attribute focusOn

             * @type array

             *

             * @description An array of objects corresponding to the nodes and events that will trigger a re-focus back on the widget.

             * The implementer can supply an array of objects, with each object having the following properties:

             * <p>eventName: (string, required): The eventName to listen to.</p>

             * <p>node: (Y.Node, optional): The Y.Node that will fire the event (defaults to the boundingBox of the widget)</p>

             * <p>By default, this attribute consists of two objects which will cause the widget to re-focus if anything

             * outside the widget is clicked on or focussed upon.</p>

             */

            focusOn: {

                valueFn: function() {

                    return [

                        {

                            // node: this.get(BOUNDING_BOX),

                            eventName: ClickOutside

                        },

                        {

                            //node: this.get(BOUNDING_BOX),

                            eventName: FocusOutside

                        }

                    ];

                },

                validator: Y.Lang.isArray

            }

    };

    WidgetModal.CLASSES = MODAL_CLASSES;

    WidgetModal._MASK = null;

    /**

     * Returns the mask if it exists on the page - otherwise creates a mask. There's only

     * one mask on a page at a given time.

     * <p>

     * This method in invoked internally by the getter of the maskNode ATTR.

     * </p>

     * @method _GET_MASK

     * @static

     */

    WidgetModal._GET_MASK = function() {

        var mask = WidgetModal._MASK,

            win  = Y.one('win');

        if (mask && (mask.getDOMNode() !== null) && mask.inDoc()) {

            return mask;

        }

        mask = Y.Node.create('<div></div>').addClass(MODAL_CLASSES.mask);

        WidgetModal._MASK = mask;

        if (supportsPosFixed) {

            mask.setStyles({

                position: 'fixed',

                width   : '100%',

                height  : '100%',

                top     : '0',

                left    : '0',

                display : 'block'

            });

        } else {

            mask.setStyles({

                position: 'absolute',

                width   : win.get('winWidth') +'px',

                height  : win.get('winHeight') + 'px',

                top     : '0',

                left    : '0',

                display : 'block'

            });

        }

        return mask;

    };

    /**

     * A stack of Y.Widget objects representing the current hierarchy of modal widgets presently displayed on the screen

     * @property STACK

     */

    WidgetModal.STACK = [];

    WidgetModal.prototype = {

        initializer: function () {

            Y.after(this._renderUIModal, this, RENDER_UI);

            Y.after(this._syncUIModal, this, SYNC_UI);

            Y.after(this._bindUIModal, this, BIND_UI);

        },

        destructor: function () {

            // Hack to remove this thing from the STACK.

            this._uiSetHostVisibleModal(false);

        },

        // *** Instance Members *** //

        _uiHandlesModal: null,

        /**

         * Adds modal class to the bounding box of the widget

         * <p>

         * This method in invoked after renderUI is invoked for the Widget class

         * using YUI's aop infrastructure.

         * </p>

         * @method _renderUIModal

         * @protected

         */

        _renderUIModal : function () {

            var bb = this.get(BOUNDING_BOX);

                //cb = this.get(CONTENT_BOX);

            //this makes the content box content appear over the mask

            // cb.setStyles({

            //     position: ""

            // });

            this._repositionMask(this);

            bb.addClass(MODAL_CLASSES.modal);

        },

        /**

         * Hooks up methods to be executed when the widget's visibility or z-index changes

         * <p>

         * This method in invoked after bindUI is invoked for the Widget class

         * using YUI's aop infrastructure.

         * </p>

         * @method _bindUIModal

         * @protected

         */

        _bindUIModal : function () {

            this.after(VISIBLE+CHANGE, this._afterHostVisibleChangeModal);

            this.after(Z_INDEX+CHANGE, this._afterHostZIndexChangeModal);

            this.after("focusOnChange", this._afterFocusOnChange);

            // Re-align the mask in the viewport if `position: fixed;` is not

            // supported. iOS < 5 and Android < 3 don't actually support it even

            // though they both pass the feature test; the UA sniff is here to

            // account for that. Ideally this should be replaced with a better

            // feature test.

            if (!supportsPosFixed ||

                    (Y.UA.ios && Y.UA.ios < 5) ||

                    (Y.UA.android && Y.UA.android < 3)) {

                Y.one('win').on('scroll', this._resyncMask, this);

            }

        },

        /**

         * Syncs the mask with the widget's current state, namely the visibility and z-index of the widget

         * <p>

         * This method in invoked after syncUI is invoked for the Widget class

         * using YUI's aop infrastructure.

         * </p>

         * @method _syncUIModal

         * @protected

         */

        _syncUIModal : function () {

            //var host = this.get(HOST);

            this._uiSetHostVisibleModal(this.get(VISIBLE));

        },

        /**

         * Provides mouse and tab focus to the widget's bounding box.

         *

         * @method _focus

         */

        _focus : function () {

            var bb = this.get(BOUNDING_BOX),

            oldTI = bb.get('tabIndex');

            bb.set('tabIndex', oldTI >= 0 ? oldTI : 0);

            this.focus();

        },

        /**

         * Blurs the widget.

         *

         * @method _blur

         */

        _blur : function () {

            this.blur();

        },

        /**

         * Returns the Y.Node instance of the maskNode

         *

         * @method _getMaskNode

         * @return {Node} The Y.Node instance of the mask, as returned from WidgetModal._GET_MASK

         */

        _getMaskNode : function () {

            return WidgetModal._GET_MASK();

        },

        /**

         * Performs events attaching/detaching, stack shifting and mask repositioning based on the visibility of the widget

         *

         * @method _uiSetHostVisibleModal

         * @param {boolean} Whether the widget is visible or not

         */

        _uiSetHostVisibleModal : function (visible) {

            var stack    = WidgetModal.STACK,

                maskNode = this.get('maskNode'),

                isModal  = this.get('modal'),

                topModal, index;

            if (visible) {

                Y.Array.each(stack, function(modal){

                    modal._detachUIHandlesModal();

                    modal._blur();

                });

                // push on top of stack

                stack.unshift(this);

                this._repositionMask(this);

                this._uiSetHostZIndexModal(this.get(Z_INDEX));

                if (isModal) {

                    maskNode.show();

                    Y.later(1, this, '_attachUIHandlesModal');

                    this._focus();

                }

            } else {

                index = Y.Array.indexOf(stack, this);

                if (index >= 0) {

                    // Remove modal widget from global stack.

                    stack.splice(index, 1);

                }

                this._detachUIHandlesModal();

                this._blur();

                if (stack.length) {

                    topModal = stack[0];

                    this._repositionMask(topModal);

                    //topModal._attachUIHandlesModal();

                    topModal._uiSetHostZIndexModal(topModal.get(Z_INDEX));

                    if (topModal.get('modal')) {

                        //topModal._attachUIHandlesModal();

                        Y.later(1, topModal, '_attachUIHandlesModal');

                        topModal._focus();

                    }

                } else {

                    if (maskNode.getStyle('display') === 'block') {

                        maskNode.hide();

                    }

                }

            }

        },

        /**

         * Sets the z-index of the mask node.

         *

         * @method _uiSetHostZIndexModal

         * @param {Number} Z-Index of the widget

         */

        _uiSetHostZIndexModal : function (zIndex) {

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

                this.get('maskNode').setStyle(Z_INDEX, zIndex || 0);

            }

        },

        /**

         * Attaches UI Listeners for "clickoutside" and "focusoutside" on the

         * widget. When these events occur, and the widget is modal, focus is

         * shifted back onto the widget.

         *

         * @method _attachUIHandlesModal

         */

        _attachUIHandlesModal : function () {

            if (this._uiHandlesModal || WidgetModal.STACK[0] !== this) {

                // Quit early if we have ui handles, or if we not at the top

                // of the global stack.

                return;

            }

            var bb          = this.get(BOUNDING_BOX),

                maskNode    = this.get('maskNode'),

                focusOn     = this.get('focusOn'),

                focus       = Y.bind(this._focus, this),

                uiHandles   = [],

                i, len, o;

            for (i = 0, len = focusOn.length; i < len; i++) {

                o = {};

                o.node = focusOn[i].node;

                o.ev = focusOn[i].eventName;

                o.keyCode = focusOn[i].keyCode;

                //no keycode or node defined

                if (!o.node && !o.keyCode && o.ev) {

                    uiHandles.push(bb.on(o.ev, focus));

                }

                //node defined, no keycode (not a keypress)

                else if (o.node && !o.keyCode && o.ev) {

                    uiHandles.push(o.node.on(o.ev, focus));

                }

                //node defined, keycode defined, event defined (its a key press)

                else if (o.node && o.keyCode && o.ev) {

                    uiHandles.push(o.node.on(o.ev, focus, o.keyCode));

                }

                else {

                    Y.log('focusOn ATTR Error: The event with name "'+o.ev+'" could not be attached.');

                }

            }

            if ( ! supportsPosFixed) {

                uiHandles.push(Y.one('win').on('scroll', Y.bind(function(){

                    maskNode.setStyle('top', maskNode.get('docScrollY'));

                }, this)));

            }

            this._uiHandlesModal = uiHandles;

        },

        /**

         * Detaches all UI Listeners that were set in _attachUIHandlesModal from the widget.

         *

         * @method _detachUIHandlesModal

         */

        _detachUIHandlesModal : function () {

            Y.each(this._uiHandlesModal, function(h){

                h.detach();

            });

            this._uiHandlesModal = null;

        },

        /**

         * Default function that is called when visibility is changed on the widget.

         *

         * @method _afterHostVisibleChangeModal

         * @param {EventFacade} e The event facade of the change

         */

        _afterHostVisibleChangeModal : function (e) {

            this._uiSetHostVisibleModal(e.newVal);

        },

        /**

         * Default function that is called when z-index is changed on the widget.

         *

         * @method _afterHostZIndexChangeModal

         * @param {EventFacade} e The event facade of the change

         */

        _afterHostZIndexChangeModal : function (e) {

            this._uiSetHostZIndexModal(e.newVal);

        },

        /**

         * Returns a boolean representing whether the current widget is in a "nested modality" state.

         * This is done by checking the number of widgets currently on the stack.

         *

         * @method isNested

         * @public

         */

        isNested: function() {

            var length = WidgetModal.STACK.length,

            retval = (length > 1) ? true : false;

            return retval;

        },

        /**

         * Repositions the mask in the DOM for nested modality cases.

         *

         * @method _repositionMask

         * @param {Widget} nextElem The Y.Widget instance that will be visible in the stack once the current widget is closed.

         */

        _repositionMask: function(nextElem) {

            var currentModal = this.get('modal'),

                nextModal    = nextElem.get('modal'),

                maskNode     = this.get('maskNode'),

                bb, bbParent;

            //if this is modal and host is not modal

            if (currentModal && !nextModal) {

                //leave the mask where it is, since the host is not modal.

                maskNode.remove();

                this.fire(MaskHide);

            }

            //if the main widget is not modal but the host is modal, or both of them are modal

            else if ((!currentModal && nextModal) || (currentModal && nextModal)) {

                //then remove the mask off DOM, reposition it, and reinsert it into the DOM

                maskNode.remove();

                this.fire(MaskHide);

                bb = nextElem.get(BOUNDING_BOX);

                bbParent = bb.get('parentNode') || Y.one('body');

                bbParent.insert(maskNode, bbParent.get('firstChild'));

                this.fire(MaskShow);

            }

        },

        /**

         * Resyncs the mask in the viewport for browsers that don't support fixed positioning

         *

         * @method _resyncMask

         * @param {Y.Widget} nextElem The Y.Widget instance that will be visible in the stack once the current widget is closed.

         * @private

         */

        _resyncMask: function (e) {

            var o       = e.currentTarget,

                offsetX = o.get('docScrollX'),

                offsetY = o.get('docScrollY'),

                w       = o.get('innerWidth') || o.get('winWidth'),

                h       = o.get('innerHeight') || o.get('winHeight'),

                mask    = this.get('maskNode');

            mask.setStyles({

                "top": offsetY + "px",

                "left": offsetX + "px",

                "width": w + 'px',

                "height": h + 'px'

            });

        },

        /**

         * Default function called when focusOn Attribute is changed. Remove existing listeners and create new listeners.

         *

         * @method _afterFocusOnChange

         */

        _afterFocusOnChange : function() {

            this._detachUIHandlesModal();

            if (this.get(VISIBLE)) {

                this._attachUIHandlesModal();

            }

        }

    };

    Y.WidgetModality = WidgetModal;

}, '3.18.1', {"requires": ["base-build", "event-outside", "widget"], "skinnable": true});