/*

YUI 3.10.3 (build 2fb5187)

Copyright 2013 Yahoo! Inc. All rights reserved.

Licensed under the BSD License.

http://yuilibrary.com/license/

*/

YUI.add('io-xdr', function (Y, NAME) {

/**

Extends IO to provide an alternate, Flash transport, for making

cross-domain requests.

@module io

@submodule io-xdr

@for IO

**/

// Helpful resources when working with the mess that is XDomainRequest:

// http://www.cypressnorth.com/blog/web-programming-and-development/internet-explorer-aborting-ajax-requests-fixed/

// http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx

/**

Fires when the XDR transport is ready for use.

@event io:xdrReady

**/

var E_XDR_READY = Y.publish('io:xdrReady', { fireOnce: true }),

/**

Map of stored configuration objects when using

Flash as the transport for cross-domain requests.

@property _cB

@private

@type {Object}

**/

_cB = {},

/**

Map of transaction simulated readyState values

when XDomainRequest is the transport.

@property _rS

@private

@type {Object}

**/

_rS = {},

// Document reference

d = Y.config.doc,

// Window reference

w = Y.config.win,

// XDomainRequest cross-origin request detection

xdr = w && w.XDomainRequest;

/**

Method that creates the Flash transport swf.

@method _swf

@private

@param {String} uri - location of io.swf.

@param {String} yid - YUI sandbox id.

@param {String} yid - IO instance id.

**/

function _swf(uri, yid, uid) {

    var o = '<object id="io_swf" type="application/x-shockwave-flash" data="' +

            uri + '" width="0" height="0">' +

            '<param name="movie" value="' + uri + '">' +

            '<param name="FlashVars" value="yid=' + yid + '&uid=' + uid + '">' +

            '<param name="allowScriptAccess" value="always">' +

            '</object>',

        c = d.createElement('div');

    d.body.appendChild(c);

    c.innerHTML = o;

}

/**

Creates a response object for XDR transactions, for success

and failure cases.

@method _data

@private

@param {Object} o - Transaction object generated by _create() in io-base.

@param {Boolean} u - Configuration xdr.use.

@param {Boolean} d - Configuration xdr.dataType.

@return {Object}

**/

function _data(o, u, d) {

    if (u === 'flash') {

        o.c.responseText = decodeURI(o.c.responseText);

    }

    if (d === 'xml') {

        o.c.responseXML = Y.DataType.XML.parse(o.c.responseText);

    }

    return o;

}

/**

Method for intiating an XDR transaction abort.

@method _abort

@private

@param {Object} o - Transaction object generated by _create() in io-base.

@param {Object} c - configuration object for the transaction.

**/

function _abort(o, c) {

    return o.c.abort(o.id, c);

}

/**

Method for determining if an XDR transaction has completed

and all data are received.

@method _isInProgress

@private

@param {Object} o - Transaction object generated by _create() in io-base.

**/

function _isInProgress(o) {

    return xdr ? _rS[o.id] !== 4 : o.c.isInProgress(o.id);

}

Y.mix(Y.IO.prototype, {

    /**

    Map of io transports.

    @property _transport

    @private

    @type {Object}

    **/

    _transport: {},

    /**

    Sets event handlers for XDomainRequest transactions.

    @method _ieEvt

    @private

    @static

    @param {Object} o - Transaction object generated by _create() in io-base.

    @param {Object} c - configuration object for the transaction.

    **/

    _ieEvt: function(o, c) {

        var io = this,

            i = o.id,

            t = 'timeout';

        o.c.onprogress = function() { _rS[i] = 3; };

        o.c.onload = function() {

            _rS[i] = 4;

            io.xdrResponse('success', o, c);

        };

        o.c.onerror = function() {

            _rS[i] = 4;

            io.xdrResponse('failure', o, c);

        };

        o.c.ontimeout = function() {

            _rS[i] = 4;

            io.xdrResponse(t, o, c);

        };

        o.c[t] = c[t] || 0;

    },

    /**

    Method for accessing the transport's interface for making a

    cross-domain transaction.

    @method xdr

    @param {String} uri - qualified path to transaction resource.

    @param {Object} o - Transaction object generated by _create() in io-base.

    @param {Object} c - configuration object for the transaction.

    **/

    xdr: function(uri, o, c) {

        var io = this;

        if (c.xdr.use === 'flash') {

            // The configuration object cannot be serialized safely

            // across Flash's ExternalInterface.

            _cB[o.id] = c;

            w.setTimeout(function() {

                try {

                    o.c.send(uri, { id: o.id,

                                    uid: o.uid,

                                    method: c.method,

                                    data: c.data,

                                    headers: c.headers });

                }

                catch(e) {

                    io.xdrResponse('transport error', o, c);

                    delete _cB[o.id];

                }

            }, Y.io.xdr.delay);

        }

        else if (xdr) {

            io._ieEvt(o, c);

            o.c.open(c.method || 'GET', uri);

            // Make async to protect against IE 8 oddities.

            setTimeout(function() {

                o.c.send(c.data);

            }, 0);

        }

        else {

            o.c.send(uri, o, c);

        }

        return {

            id: o.id,

            abort: function() {

                return o.c ? _abort(o, c) : false;

            },

            isInProgress: function() {

                return o.c ? _isInProgress(o.id) : false;

            },

            io: io

        };

    },

    /**

    Response controller for cross-domain requests when using the

    Flash transport or IE8's XDomainRequest object.

    @method xdrResponse

    @param {String} e Event name

    @param {Object} o Transaction object generated by _create() in io-base.

    @param {Object} c Configuration object for the transaction.

    @return {Object}

    **/

    xdrResponse: function(e, o, c) {

        c = _cB[o.id] ? _cB[o.id] : c;

        var io = this,

            m = xdr ? _rS : _cB,

            u = c.xdr.use,

            d = c.xdr.dataType;

        switch (e) {

            case 'start':

                io.start(o, c);

                break;

           //case 'complete':

                //This case is not used by Flash or XDomainRequest.

                //io.complete(o, c);

                //break;

            case 'success':

                io.success(_data(o, u, d), c);

                delete m[o.id];

                break;

            case 'timeout':

            case 'abort':

            case 'transport error':

                o.c = { status: 0, statusText: e };

            case 'failure':

                io.failure(_data(o, u, d), c);

                delete m[o.id];

                break;

        }

    },

    /**

    Fires event "io:xdrReady"

    @method _xdrReady

    @private

    @param {Number} yid - YUI sandbox id.

    @param {Number} uid - IO instance id.

    **/

    _xdrReady: function(yid, uid) {

        Y.fire(E_XDR_READY, yid, uid);

    },

    /**

    Initializes the desired transport.

    @method transport

    @param {Object} o - object of transport configurations.

    **/

    transport: function(c) {

        if (c.id === 'flash') {

            _swf(Y.UA.ie ? c.src + '?d=' + new Date().valueOf().toString() : c.src, Y.id, c.uid);

            Y.IO.transports.flash = function() { return d.getElementById('io_swf'); };

        }

    }

});

/**

Fires event "io:xdrReady"

@method xdrReady

@protected

@static

@param {Number} yid - YUI sandbox id.

@param {Number} uid - IO instance id.

**/

Y.io.xdrReady = function(yid, uid){

    var io = Y.io._map[uid];

    Y.io.xdr.delay = 0;

    io._xdrReady.apply(io, [yid, uid]);

};

Y.io.xdrResponse = function(e, o, c){

    var io = Y.io._map[o.uid];

    io.xdrResponse.apply(io, [e, o, c]);

};

Y.io.transport = function(c){

    var io = Y.io._map['io:0'] || new Y.IO();

    c.uid = io._uid;

    io.transport.apply(io, [c]);

};

/**

Delay value to calling the Flash transport, in the

event io.swf has not finished loading.  Once the E_XDR_READY

event is fired, this value will be set to 0.

@property delay

@static

@type {Number}

**/

Y.io.xdr = { delay : 100 };

}, '3.10.3', {"requires": ["io-base", "datatype-xml-parse"]});