/*

 * jQuery File Upload Plugin 5.28.8

 * https://github.com/blueimp/jQuery-File-Upload

 *

 * Copyright 2010, Sebastian Tschan

 * https://blueimp.net

 *

 * Licensed under the MIT license:

 * http://www.opensource.org/licenses/MIT

 */



/*jslint nomen: true, unparam: true, regexp: true */

/*global define, window, document, File, Blob, FormData, location */



(function (factory) {

    'use strict';

    if (typeof define === 'function' && define.amd) {

        // Register as an anonymous AMD module:

        define([

            'jquery',

            'jquery.ui.widget.js'

        ], factory);

    } else {

        // Browser globals:

        factory(window.jQuery);

    }

}(function ($) {

    'use strict';



    // The FileReader API is not actually used, but works as feature detection,

    // as e.g. Safari supports XHR file uploads via the FormData API,

    // but not non-multipart XHR file uploads:

    $.support.xhrFileUpload = !!(window.XMLHttpRequestUpload && window.FileReader);

    $.support.xhrFormDataFileUpload = !!window.FormData;



    // The fileupload widget listens for change events on file input fields defined

    // via fileInput setting and paste or drop events of the given dropZone.

    // In addition to the default jQuery Widget methods, the fileupload widget

    // exposes the "add" and "send" methods, to add or directly send files using

    // the fileupload API.

    // By default, files added via file input selection, paste, drag & drop or

    // "add" method are uploaded immediately, but it is possible to override

    // the "add" callback option to queue file uploads.

    $.widget('blueimp.fileupload', {



        options: {

            // The drop target element(s), by the default the complete document.

            // Set to null to disable drag & drop support:

            dropZone: $(document),

            // The paste target element(s), by the default the complete document.

            // Set to null to disable paste support:

            pasteZone: $(document),

            // The file input field(s), that are listened to for change events.

            // If undefined, it is set to the file input fields inside

            // of the widget element on plugin initialization.

            // Set to null to disable the change listener.

            fileInput: undefined,

            // By default, the file input field is replaced with a clone after

            // each input field change event. This is required for iframe transport

            // queues and allows change events to be fired for the same file

            // selection, but can be disabled by setting the following option to false:

            replaceFileInput: true,

            // The parameter name for the file form data (the request argument name).

            // If undefined or empty, the name property of the file input field is

            // used, or "files[]" if the file input name property is also empty,

            // can be a string or an array of strings:

            paramName: undefined,

            // By default, each file of a selection is uploaded using an individual

            // request for XHR type uploads. Set to false to upload file

            // selections in one request each:

            singleFileUploads: true,

            // To limit the number of files uploaded with one XHR request,

            // set the following option to an integer greater than 0:

            limitMultiFileUploads: undefined,

            // Set the following option to true to issue all file upload requests

            // in a sequential order:

            sequentialUploads: false,

            // To limit the number of concurrent uploads,

            // set the following option to an integer greater than 0:

            limitConcurrentUploads: undefined,

            // Set the following option to true to force iframe transport uploads:

            forceIframeTransport: false,

            // Set the following option to the location of a redirect url on the

            // origin server, for cross-domain iframe transport uploads:

            redirect: undefined,

            // The parameter name for the redirect url, sent as part of the form

            // data and set to 'redirect' if this option is empty:

            redirectParamName: undefined,

            // Set the following option to the location of a postMessage window,

            // to enable postMessage transport uploads:

            postMessage: undefined,

            // By default, XHR file uploads are sent as multipart/form-data.

            // The iframe transport is always using multipart/form-data.

            // Set to false to enable non-multipart XHR uploads:

            multipart: true,

            // To upload large files in smaller chunks, set the following option

            // to a preferred maximum chunk size. If set to 0, null or undefined,

            // or the browser does not support the required Blob API, files will

            // be uploaded as a whole.

            maxChunkSize: undefined,

            // When a non-multipart upload or a chunked multipart upload has been

            // aborted, this option can be used to resume the upload by setting

            // it to the size of the already uploaded bytes. This option is most

            // useful when modifying the options object inside of the "add" or

            // "send" callbacks, as the options are cloned for each file upload.

            uploadedBytes: undefined,

            // By default, failed (abort or error) file uploads are removed from the

            // global progress calculation. Set the following option to false to

            // prevent recalculating the global progress data:

            recalculateProgress: true,

            // Interval in milliseconds to calculate and trigger progress events:

            progressInterval: 100,

            // Interval in milliseconds to calculate progress bitrate:

            bitrateInterval: 500,

            // By default, uploads are started automatically when adding files:

            autoUpload: true,



            // Additional form data to be sent along with the file uploads can be set

            // using this option, which accepts an array of objects with name and

            // value properties, a function returning such an array, a FormData

            // object (for XHR file uploads), or a simple object.

            // The form of the first fileInput is given as parameter to the function:

            formData: function (form) {

                return form.serializeArray();

            },



            // The add callback is invoked as soon as files are added to the fileupload

            // widget (via file input selection, drag & drop, paste or add API call).

            // If the singleFileUploads option is enabled, this callback will be

            // called once for each file in the selection for XHR file uplaods, else

            // once for each file selection.

            // The upload starts when the submit method is invoked on the data parameter.

            // The data object contains a files property holding the added files

            // and allows to override plugin options as well as define ajax settings.

            // Listeners for this callback can also be bound the following way:

            // .bind('fileuploadadd', func);

            // data.submit() returns a Promise object and allows to attach additional

            // handlers using jQuery's Deferred callbacks:

            // data.submit().done(func).fail(func).always(func);

            add: function (e, data) {

                if (data.autoUpload || (data.autoUpload !== false &&

                        ($(this).data('blueimp-fileupload') ||

                        $(this).data('fileupload')).options.autoUpload)) {

                    data.submit();

                }

            },



            // Other callbacks:



            // Callback for the submit event of each file upload:

            // submit: function (e, data) {}, // .bind('fileuploadsubmit', func);



            // Callback for the start of each file upload request:

            // send: function (e, data) {}, // .bind('fileuploadsend', func);



            // Callback for successful uploads:

            // done: function (e, data) {}, // .bind('fileuploaddone', func);



            // Callback for failed (abort or error) uploads:

            // fail: function (e, data) {}, // .bind('fileuploadfail', func);



            // Callback for completed (success, abort or error) requests:

            // always: function (e, data) {}, // .bind('fileuploadalways', func);



            // Callback for upload progress events:

            // progress: function (e, data) {}, // .bind('fileuploadprogress', func);



            // Callback for global upload progress events:

            // progressall: function (e, data) {}, // .bind('fileuploadprogressall', func);



            // Callback for uploads start, equivalent to the global ajaxStart event:

            // start: function (e) {}, // .bind('fileuploadstart', func);



            // Callback for uploads stop, equivalent to the global ajaxStop event:

            // stop: function (e) {}, // .bind('fileuploadstop', func);



            // Callback for change events of the fileInput(s):

            // change: function (e, data) {}, // .bind('fileuploadchange', func);



            // Callback for paste events to the pasteZone(s):

            // paste: function (e, data) {}, // .bind('fileuploadpaste', func);



            // Callback for drop events of the dropZone(s):

            // drop: function (e, data) {}, // .bind('fileuploaddrop', func);



            // Callback for dragover events of the dropZone(s):

            // dragover: function (e) {}, // .bind('fileuploaddragover', func);



            // Callback for the start of each chunk upload request:

            // chunksend: function (e, data) {}, // .bind('fileuploadchunksend', func);



            // Callback for successful chunk uploads:

            // chunkdone: function (e, data) {}, // .bind('fileuploadchunkdone', func);



            // Callback for failed (abort or error) chunk uploads:

            // chunkfail: function (e, data) {}, // .bind('fileuploadchunkfail', func);



            // Callback for completed (success, abort or error) chunk upload requests:

            // chunkalways: function (e, data) {}, // .bind('fileuploadchunkalways', func);



            // The plugin options are used as settings object for the ajax calls.

            // The following are jQuery ajax settings required for the file uploads:

            processData: false,

            contentType: false,

            cache: false

        },



        // A list of options that require a refresh after assigning a new value:

        _refreshOptionsList: [

            'fileInput',

            'dropZone',

            'pasteZone',

            'multipart',

            'forceIframeTransport'

        ],



        _BitrateTimer: function () {

            this.timestamp = ((Date.now) ? Date.now() : (new Date()).getTime());

            this.loaded = 0;

            this.bitrate = 0;

            this.getBitrate = function (now, loaded, interval) {

                var timeDiff = now - this.timestamp;

                if (!this.bitrate || !interval || timeDiff > interval) {

                    this.bitrate = (loaded - this.loaded) * (1000 / timeDiff) * 8;

                    this.loaded = loaded;

                    this.timestamp = now;

                }

                return this.bitrate;

            };

        },



        _isXHRUpload: function (options) {

            return !options.forceIframeTransport &&

                ((!options.multipart && $.support.xhrFileUpload) ||

                $.support.xhrFormDataFileUpload);

        },



        _getFormData: function (options) {

            var formData;

            if (typeof options.formData === 'function') {

                return options.formData(options.form);

            }

            if ($.isArray(options.formData)) {

                return options.formData;

            }

            if ($.type(options.formData) === 'object') {

                formData = [];

                $.each(options.formData, function (name, value) {

                    formData.push({name: name, value: value});

                });

                return formData;

            }

            return [];

        },



        _getTotal: function (files) {

            var total = 0;

            $.each(files, function (index, file) {

                total += file.size || 1;

            });

            return total;

        },



        _initProgressObject: function (obj) {

            var progress = {

                loaded: 0,

                total: 0,

                bitrate: 0

            };

            if (obj._progress) {

                $.extend(obj._progress, progress);

            } else {

                obj._progress = progress;

            }

        },



        _initResponseObject: function (obj) {

            var prop;

            if (obj._response) {

                for (prop in obj._response) {

                    if (obj._response.hasOwnProperty(prop)) {

                        delete obj._response[prop];

                    }

                }

            } else {

                obj._response = {};

            }

        },



        _onProgress: function (e, data) {

            if (e.lengthComputable) {

                var now = ((Date.now) ? Date.now() : (new Date()).getTime()),

                    loaded;

                if (data._time && data.progressInterval &&

                        (now - data._time < data.progressInterval) &&

                        e.loaded !== e.total) {

                    return;

                }

                data._time = now;

                loaded = Math.floor(

                    e.loaded / e.total * (data.chunkSize || data._progress.total)

                ) + (data.uploadedBytes || 0);

                // Add the difference from the previously loaded state

                // to the global loaded counter:

                this._progress.loaded += (loaded - data._progress.loaded);

                this._progress.bitrate = this._bitrateTimer.getBitrate(

                    now,

                    this._progress.loaded,

                    data.bitrateInterval

                );

                data._progress.loaded = data.loaded = loaded;

                data._progress.bitrate = data.bitrate = data._bitrateTimer.getBitrate(

                    now,

                    loaded,

                    data.bitrateInterval

                );

                // Trigger a custom progress event with a total data property set

                // to the file size(s) of the current upload and a loaded data

                // property calculated accordingly:

                this._trigger('progress', e, data);

                // Trigger a global progress event for all current file uploads,

                // including ajax calls queued for sequential file uploads:

                this._trigger('progressall', e, this._progress);

            }

        },



        _initProgressListener: function (options) {

            var that = this,

                xhr = options.xhr ? options.xhr() : $.ajaxSettings.xhr();

            // Accesss to the native XHR object is required to add event listeners

            // for the upload progress event:

            if (xhr.upload) {

                $(xhr.upload).bind('progress', function (e) {

                    var oe = e.originalEvent;

                    // Make sure the progress event properties get copied over:

                    e.lengthComputable = oe.lengthComputable;

                    e.loaded = oe.loaded;

                    e.total = oe.total;

                    that._onProgress(e, options);

                });

                options.xhr = function () {

                    return xhr;

                };

            }

        },



        _isInstanceOf: function (type, obj) {

            // Cross-frame instanceof check

            return Object.prototype.toString.call(obj) === '[object ' + type + ']';

        },



        _initXHRData: function (options) {

            var that = this,

                formData,

                file = options.files[0],

                // Ignore non-multipart setting if not supported:

                multipart = options.multipart || !$.support.xhrFileUpload,

                paramName = options.paramName[0];

            options.headers = options.headers || {};

            if (options.contentRange) {

                options.headers['Content-Range'] = options.contentRange;

            }

            if (!multipart) {

                options.headers['Content-Disposition'] = 'attachment; filename="' +

                    encodeURI(file.name) + '"';

                options.contentType = file.type;

                options.data = options.blob || file;

            } else if ($.support.xhrFormDataFileUpload) {

                if (options.postMessage) {

                    // window.postMessage does not allow sending FormData

                    // objects, so we just add the File/Blob objects to

                    // the formData array and let the postMessage window

                    // create the FormData object out of this array:

                    formData = this._getFormData(options);

                    if (options.blob) {

                        formData.push({

                            name: paramName,

                            value: options.blob

                        });

                    } else {

                        $.each(options.files, function (index, file) {

                            formData.push({

                                name: options.paramName[index] || paramName,

                                value: file

                            });

                        });

                    }

                } else {

                    if (that._isInstanceOf('FormData', options.formData)) {

                        formData = options.formData;

                    } else {

                        formData = new FormData();

                        $.each(this._getFormData(options), function (index, field) {

                            formData.append(field.name, field.value);

                        });

                    }

                    if (options.blob) {

                        options.headers['Content-Disposition'] = 'attachment; filename="' +

                            encodeURI(file.name) + '"';

                        formData.append(paramName, options.blob, file.name);

                    } else {

                        $.each(options.files, function (index, file) {

                            // This check allows the tests to run with

                            // dummy objects:

                            if (that._isInstanceOf('File', file) ||

                                    that._isInstanceOf('Blob', file)) {

                                formData.append(

                                    options.paramName[index] || paramName,

                                    file,

                                    file.name

                                );

                            }

                        });

                    }

                }

                options.data = formData;

            }

            // Blob reference is not needed anymore, free memory:

            options.blob = null;

        },



        _initIframeSettings: function (options) {

            // Setting the dataType to iframe enables the iframe transport:

            options.dataType = 'iframe ' + (options.dataType || '');

            // The iframe transport accepts a serialized array as form data:

            options.formData = this._getFormData(options);

            // Add redirect url to form data on cross-domain uploads:

            if (options.redirect && $('<a></a>').prop('href', options.url)

                    .prop('host') !== location.host) {

                options.formData.push({

                    name: options.redirectParamName || 'redirect',

                    value: options.redirect

                });

            }

        },



        _initDataSettings: function (options) {

            if (this._isXHRUpload(options)) {

                if (!this._chunkedUpload(options, true)) {

                    if (!options.data) {

                        this._initXHRData(options);

                    }

                    this._initProgressListener(options);

                }

                if (options.postMessage) {

                    // Setting the dataType to postmessage enables the

                    // postMessage transport:

                    options.dataType = 'postmessage ' + (options.dataType || '');

                }

            } else {

                this._initIframeSettings(options);

            }

        },



        _getParamName: function (options) {

            var fileInput = $(options.fileInput),

                paramName = options.paramName;

            if (!paramName) {

                paramName = [];

                fileInput.each(function () {

                    var input = $(this),

                        name = input.prop('name') || 'files[]',

                        i = (input.prop('files') || [1]).length;

                    while (i) {

                        paramName.push(name);

                        i -= 1;

                    }

                });

                if (!paramName.length) {

                    paramName = [fileInput.prop('name') || 'files[]'];

                }

            } else if (!$.isArray(paramName)) {

                paramName = [paramName];

            }

            return paramName;

        },



        _initFormSettings: function (options) {

            // Retrieve missing options from the input field and the

            // associated form, if available:

            if (!options.form || !options.form.length) {

                options.form = $(options.fileInput.prop('form'));

                // If the given file input doesn't have an associated form,

                // use the default widget file input's form:

                if (!options.form.length) {

                    options.form = $(this.options.fileInput.prop('form'));

                }

            }

            options.paramName = this._getParamName(options);

            if (!options.url) {

                options.url = options.form.prop('action') || location.href;

            }

            // The HTTP request method must be "POST" or "PUT":

            options.type = (options.type || options.form.prop('method') || '')

                .toUpperCase();

            if (options.type !== 'POST' && options.type !== 'PUT' &&

                    options.type !== 'PATCH') {

                options.type = 'POST';

            }

            if (!options.formAcceptCharset) {

                options.formAcceptCharset = options.form.attr('accept-charset');

            }

        },



        _getAJAXSettings: function (data) {

            var options = $.extend({}, this.options, data);

            this._initFormSettings(options);

            this._initDataSettings(options);

            return options;

        },



        // jQuery 1.6 doesn't provide .state(),

        // while jQuery 1.8+ removed .isRejected() and .isResolved():

        _getDeferredState: function (deferred) {

            if (deferred.state) {

                return deferred.state();

            }

            if (deferred.isResolved()) {

                return 'resolved';

            }

            if (deferred.isRejected()) {

                return 'rejected';

            }

            return 'pending';

        },



        // Maps jqXHR callbacks to the equivalent

        // methods of the given Promise object:

        _enhancePromise: function (promise) {

            promise.success = promise.done;

            promise.error = promise.fail;

            promise.complete = promise.always;

            return promise;

        },



        // Creates and returns a Promise object enhanced with

        // the jqXHR methods abort, success, error and complete:

        _getXHRPromise: function (resolveOrReject, context, args) {

            var dfd = $.Deferred(),

                promise = dfd.promise();

            context = context || this.options.context || promise;

            if (resolveOrReject === true) {

                dfd.resolveWith(context, args);

            } else if (resolveOrReject === false) {

                dfd.rejectWith(context, args);

            }

            promise.abort = dfd.promise;

            return this._enhancePromise(promise);

        },



        // Adds convenience methods to the callback arguments:

        _addConvenienceMethods: function (e, data) {

            var that = this;

            data.submit = function () {

                if (this.state() !== 'pending') {

                    data.jqXHR = this.jqXHR =

                        (that._trigger('submit', e, this) !== false) &&

                        that._onSend(e, this);

                }

                return this.jqXHR || that._getXHRPromise();

            };

            data.abort = function () {

                if (this.jqXHR) {

                    return this.jqXHR.abort();

                }

                return that._getXHRPromise();

            };

            data.state = function () {

                if (this.jqXHR) {

                    return that._getDeferredState(this.jqXHR);

                }

            };

            data.progress = function () {

                return this._progress;

            };

            data.response = function () {

                return this._response;

            };

        },



        // Parses the Range header from the server response

        // and returns the uploaded bytes:

        _getUploadedBytes: function (jqXHR) {

            var range = jqXHR.getResponseHeader('Range'),

                parts = range && range.split('-'),

                upperBytesPos = parts && parts.length > 1 &&

                    parseInt(parts[1], 10);

            return upperBytesPos && upperBytesPos + 1;

        },



        // Uploads a file in multiple, sequential requests

        // by splitting the file up in multiple blob chunks.

        // If the second parameter is true, only tests if the file

        // should be uploaded in chunks, but does not invoke any

        // upload requests:

        _chunkedUpload: function (options, testOnly) {

            var that = this,

                file = options.files[0],

                fs = file.size,

                ub = options.uploadedBytes = options.uploadedBytes || 0,

                mcs = options.maxChunkSize || fs,

                slice = file.slice || file.webkitSlice || file.mozSlice,

                dfd = $.Deferred(),

                promise = dfd.promise(),

                jqXHR,

                upload;

            if (!(this._isXHRUpload(options) && slice && (ub || mcs < fs)) ||

                    options.data) {

                return false;

            }

            if (testOnly) {

                return true;

            }

            if (ub >= fs) {

                file.error = 'Uploaded bytes exceed file size';

                return this._getXHRPromise(

                    false,

                    options.context,

                    [null, 'error', file.error]

                );

            }

            // The chunk upload method:

            upload = function () {

                // Clone the options object for each chunk upload:

                var o = $.extend({}, options),

                    currentLoaded = o._progress.loaded;

                o.blob = slice.call(

                    file,

                    ub,

                    ub + mcs,

                    file.type

                );

                // Store the current chunk size, as the blob itself

                // will be dereferenced after data processing:

                o.chunkSize = o.blob.size;

                // Expose the chunk bytes position range:

                o.contentRange = 'bytes ' + ub + '-' +

                    (ub + o.chunkSize - 1) + '/' + fs;

                // Process the upload data (the blob and potential form data):

                that._initXHRData(o);

                // Add progress listeners for this chunk upload:

                that._initProgressListener(o);

                jqXHR = ((that._trigger('chunksend', null, o) !== false && $.ajax(o)) ||

                        that._getXHRPromise(false, o.context))

                    .done(function (result, textStatus, jqXHR) {

                        ub = that._getUploadedBytes(jqXHR) ||

                            (ub + o.chunkSize);

                        // Create a progress event if no final progress event

                        // with loaded equaling total has been triggered

                        // for this chunk:

                        if (o._progress.loaded === currentLoaded) {

                            that._onProgress($.Event('progress', {

                                lengthComputable: true,

                                loaded: ub - o.uploadedBytes,

                                total: ub - o.uploadedBytes

                            }), o);

                        }

                        options.uploadedBytes = o.uploadedBytes = ub;

                        o.result = result;

                        o.textStatus = textStatus;

                        o.jqXHR = jqXHR;

                        that._trigger('chunkdone', null, o);

                        that._trigger('chunkalways', null, o);

                        if (ub < fs) {

                            // File upload not yet complete,

                            // continue with the next chunk:

                            upload();

                        } else {

                            dfd.resolveWith(

                                o.context,

                                [result, textStatus, jqXHR]

                            );

                        }

                    })

                    .fail(function (jqXHR, textStatus, errorThrown) {

                        o.jqXHR = jqXHR;

                        o.textStatus = textStatus;

                        o.errorThrown = errorThrown;

                        that._trigger('chunkfail', null, o);

                        that._trigger('chunkalways', null, o);

                        dfd.rejectWith(

                            o.context,

                            [jqXHR, textStatus, errorThrown]

                        );

                    });

            };

            this._enhancePromise(promise);

            promise.abort = function () {

                return jqXHR.abort();

            };

            upload();

            return promise;

        },



        _beforeSend: function (e, data) {

            if (this._active === 0) {

                // the start callback is triggered when an upload starts

                // and no other uploads are currently running,

                // equivalent to the global ajaxStart event:

                this._trigger('start');

                // Set timer for global bitrate progress calculation:

                this._bitrateTimer = new this._BitrateTimer();

                // Reset the global progress values:

                this._progress.loaded = this._progress.total = 0;

                this._progress.bitrate = 0;

            }

            // Make sure the container objects for the .response() and

            // .progress() methods on the data object are available

            // and reset to their initial state:

            this._initResponseObject(data);

            this._initProgressObject(data);

            data._progress.loaded = data.loaded = data.uploadedBytes || 0;

            data._progress.total = data.total = this._getTotal(data.files) || 1;

            data._progress.bitrate = data.bitrate = 0;

            this._active += 1;

            // Initialize the global progress values:

            this._progress.loaded += data.loaded;

            this._progress.total += data.total;

        },



        _onDone: function (result, textStatus, jqXHR, options) {

            var total = options._progress.total,

                response = options._response;

            if (options._progress.loaded < total) {

                // Create a progress event if no final progress event

                // with loaded equaling total has been triggered:

                this._onProgress($.Event('progress', {

                    lengthComputable: true,

                    loaded: total,

                    total: total

                }), options);

            }

            response.result = options.result = result;

            response.textStatus = options.textStatus = textStatus;

            response.jqXHR = options.jqXHR = jqXHR;

            this._trigger('done', null, options);

        },



        _onFail: function (jqXHR, textStatus, errorThrown, options) {

            var response = options._response;

            if (options.recalculateProgress) {

                // Remove the failed (error or abort) file upload from

                // the global progress calculation:

                this._progress.loaded -= options._progress.loaded;

                this._progress.total -= options._progress.total;

            }

            response.jqXHR = options.jqXHR = jqXHR;

            response.textStatus = options.textStatus = textStatus;

            response.errorThrown = options.errorThrown = errorThrown;

            this._trigger('fail', null, options);

        },



        _onAlways: function (jqXHRorResult, textStatus, jqXHRorError, options) {

            // jqXHRorResult, textStatus and jqXHRorError are added to the

            // options object via done and fail callbacks

            this._trigger('always', null, options);

        },



        _onSend: function (e, data) {

            if (!data.submit) {

                this._addConvenienceMethods(e, data);

            }

            var that = this,

                jqXHR,

                aborted,

                slot,

                pipe,

                options = that._getAJAXSettings(data),

                send = function () {

                    that._sending += 1;

                    // Set timer for bitrate progress calculation:

                    options._bitrateTimer = new that._BitrateTimer();

                    jqXHR = jqXHR || (

                        ((aborted || that._trigger('send', e, options) === false) &&

                        that._getXHRPromise(false, options.context, aborted)) ||

                        that._chunkedUpload(options) || $.ajax(options)

                    ).done(function (result, textStatus, jqXHR) {

                        that._onDone(result, textStatus, jqXHR, options);

                    }).fail(function (jqXHR, textStatus, errorThrown) {

                        that._onFail(jqXHR, textStatus, errorThrown, options);

                    }).always(function (jqXHRorResult, textStatus, jqXHRorError) {

                        that._onAlways(

                            jqXHRorResult,

                            textStatus,

                            jqXHRorError,

                            options

                        );

                        that._sending -= 1;

                        that._active -= 1;

                        if (options.limitConcurrentUploads &&

                                options.limitConcurrentUploads > that._sending) {

                            // Start the next queued upload,

                            // that has not been aborted:

                            var nextSlot = that._slots.shift();

                            while (nextSlot) {

                                if (that._getDeferredState(nextSlot) === 'pending') {

                                    nextSlot.resolve();

                                    break;

                                }

                                nextSlot = that._slots.shift();

                            }

                        }

                        if (that._active === 0) {

                            // The stop callback is triggered when all uploads have

                            // been completed, equivalent to the global ajaxStop event:

                            that._trigger('stop');

                        }

                    });

                    return jqXHR;

                };

            this._beforeSend(e, options);

            if (this.options.sequentialUploads ||

                    (this.options.limitConcurrentUploads &&

                    this.options.limitConcurrentUploads <= this._sending)) {

                if (this.options.limitConcurrentUploads > 1) {

                    slot = $.Deferred();

                    this._slots.push(slot);

                    pipe = slot.pipe(send);

                } else {

                    pipe = (this._sequence = this._sequence.pipe(send, send));

                }

                // Return the piped Promise object, enhanced with an abort method,

                // which is delegated to the jqXHR object of the current upload,

                // and jqXHR callbacks mapped to the equivalent Promise methods:

                pipe.abort = function () {

                    aborted = [undefined, 'abort', 'abort'];

                    if (!jqXHR) {

                        if (slot) {

                            slot.rejectWith(options.context, aborted);

                        }

                        return send();

                    }

                    return jqXHR.abort();

                };

                return this._enhancePromise(pipe);

            }

            return send();

        },



        _onAdd: function (e, data) {

            var that = this,

                result = true,

                options = $.extend({}, this.options, data),

                limit = options.limitMultiFileUploads,

                paramName = this._getParamName(options),

                paramNameSet,

                paramNameSlice,

                fileSet,

                i;

            if (!(options.singleFileUploads || limit) ||

                    !this._isXHRUpload(options)) {

                fileSet = [data.files];

                paramNameSet = [paramName];

            } else if (!options.singleFileUploads && limit) {

                fileSet = [];

                paramNameSet = [];

                for (i = 0; i < data.files.length; i += limit) {

                    fileSet.push(data.files.slice(i, i + limit));

                    paramNameSlice = paramName.slice(i, i + limit);

                    if (!paramNameSlice.length) {

                        paramNameSlice = paramName;

                    }

                    paramNameSet.push(paramNameSlice);

                }

            } else {

                paramNameSet = paramName;

            }

            data.originalFiles = data.files;

            $.each(fileSet || data.files, function (index, element) {

                var newData = $.extend({}, data);

                newData.files = fileSet ? element : [element];

                newData.paramName = paramNameSet[index];

                that._initResponseObject(newData);

                that._initProgressObject(newData);

                that._addConvenienceMethods(e, newData);

                result = that._trigger('add', e, newData);

                return result;

            });

            return result;

        },



        _replaceFileInput: function (input) {

            var inputClone = input.clone(true);

            $('<form></form>').append(inputClone)[0].reset();

            // Detaching allows to insert the fileInput on another form

            // without loosing the file input value:

            input.after(inputClone).detach();

            // Avoid memory leaks with the detached file input:

            $.cleanData(input.unbind('remove'));

            // Replace the original file input element in the fileInput

            // elements set with the clone, which has been copied including

            // event handlers:

            this.options.fileInput = this.options.fileInput.map(function (i, el) {

                if (el === input[0]) {

                    return inputClone[0];

                }

                return el;

            });

            // If the widget has been initialized on the file input itself,

            // override this.element with the file input clone:

            if (input[0] === this.element[0]) {

                this.element = inputClone;

            }

        },



        _handleFileTreeEntry: function (entry, path) {

            var that = this,

                dfd = $.Deferred(),

                errorHandler = function (e) {

                    if (e && !e.entry) {

                        e.entry = entry;

                    }

                    // Since $.when returns immediately if one

                    // Deferred is rejected, we use resolve instead.

                    // This allows valid files and invalid items

                    // to be returned together in one set:

                    dfd.resolve([e]);

                },

                dirReader;

            path = path || '';

            if (entry.isFile) {

                if (entry._file) {

                    // Workaround for Chrome bug #149735

                    entry._file.relativePath = path;

                    dfd.resolve(entry._file);

                } else {

                    entry.file(function (file) {

                        file.relativePath = path;

                        dfd.resolve(file);

                    }, errorHandler);

                }

            } else if (entry.isDirectory) {

                dirReader = entry.createReader();

                dirReader.readEntries(function (entries) {

                    that._handleFileTreeEntries(

                        entries,

                        path + entry.name + '/'

                    ).done(function (files) {

                        dfd.resolve(files);

                    }).fail(errorHandler);

                }, errorHandler);

            } else {

                // Return an empy list for file system items

                // other than files or directories:

                dfd.resolve([]);

            }

            return dfd.promise();

        },



        _handleFileTreeEntries: function (entries, path) {

            var that = this;

            return $.when.apply(

                $,

                $.map(entries, function (entry) {

                    return that._handleFileTreeEntry(entry, path);

                })

            ).pipe(function () {

                return Array.prototype.concat.apply(

                    [],

                    arguments

                );

            });

        },



        _getDroppedFiles: function (dataTransfer) {

            dataTransfer = dataTransfer || {};

            var items = dataTransfer.items;

            if (items && items.length && (items[0].webkitGetAsEntry ||

                    items[0].getAsEntry)) {

                return this._handleFileTreeEntries(

                    $.map(items, function (item) {

                        var entry;

                        if (item.webkitGetAsEntry) {

                            entry = item.webkitGetAsEntry();

                            if (entry) {

                                // Workaround for Chrome bug #149735:

                                entry._file = item.getAsFile();

                            }

                            return entry;

                        }

                        return item.getAsEntry();

                    })

                );

            }

            return $.Deferred().resolve(

                $.makeArray(dataTransfer.files)

            ).promise();

        },



        _getSingleFileInputFiles: function (fileInput) {

            fileInput = $(fileInput);

            var entries = fileInput.prop('webkitEntries') ||

                    fileInput.prop('entries'),

                files,

                value;

            if (entries && entries.length) {

                return this._handleFileTreeEntries(entries);

            }

            files = $.makeArray(fileInput.prop('files'));

            if (!files.length) {

                value = fileInput.prop('value');

                if (!value) {

                    return $.Deferred().resolve([]).promise();

                }

                // If the files property is not available, the browser does not

                // support the File API and we add a pseudo File object with

                // the input value as name with path information removed:

                files = [{name: value.replace(/^.*\\/, '')}];

            } else if (files[0].name === undefined && files[0].fileName) {

                // File normalization for Safari 4 and Firefox 3:

                $.each(files, function (index, file) {

                    file.name = file.fileName;

                    file.size = file.fileSize;

                });

            }

            return $.Deferred().resolve(files).promise();

        },



        _getFileInputFiles: function (fileInput) {

            if (!(fileInput instanceof $) || fileInput.length === 1) {

                return this._getSingleFileInputFiles(fileInput);

            }

            return $.when.apply(

                $,

                $.map(fileInput, this._getSingleFileInputFiles)

            ).pipe(function () {

                return Array.prototype.concat.apply(

                    [],

                    arguments

                );

            });

        },



        _onChange: function (e) {

            var that = this,

                data = {

                    fileInput: $(e.target),

                    form: $(e.target.form)

                };

            this._getFileInputFiles(data.fileInput).always(function (files) {

                data.files = files;

                if (that.options.replaceFileInput) {

                    that._replaceFileInput(data.fileInput);

                }

                if (that._trigger('change', e, data) !== false) {

                    that._onAdd(e, data);

                }

            });

        },



        _onPaste: function (e) {

            var items = e.originalEvent && e.originalEvent.clipboardData &&

                    e.originalEvent.clipboardData.items,

                data = {files: []};

            if (items && items.length) {

                $.each(items, function (index, item) {

                    var file = item.getAsFile && item.getAsFile();

                    if (file) {

                        data.files.push(file);

                    }

                });

                if (this._trigger('paste', e, data) === false ||

                        this._onAdd(e, data) === false) {

                    return false;

                }

            }

        },



        _onDrop: function (e) {

            var that = this,

                dataTransfer = e.dataTransfer = e.originalEvent &&

                    e.originalEvent.dataTransfer,

                data = {};

            if (dataTransfer && dataTransfer.files && dataTransfer.files.length) {

                e.preventDefault();

                this._getDroppedFiles(dataTransfer).always(function (files) {

                    data.files = files;

                    if (that._trigger('drop', e, data) !== false) {

                        that._onAdd(e, data);

                    }

                });

            }

        },



        _onDragOver: function (e) {

            var dataTransfer = e.dataTransfer = e.originalEvent &&

                e.originalEvent.dataTransfer;

            if (dataTransfer) {

                if (this._trigger('dragover', e) === false) {

                    return false;

                }

                if ($.inArray('Files', dataTransfer.types) !== -1) {

                    dataTransfer.dropEffect = 'copy';

                    e.preventDefault();

                }

            }

        },



        _initEventHandlers: function () {

            if (this._isXHRUpload(this.options)) {

                this._on(this.options.dropZone, {

                    dragover: this._onDragOver,

                    drop: this._onDrop

                });

                this._on(this.options.pasteZone, {

                    paste: this._onPaste

                });

            }

            this._on(this.options.fileInput, {

                change: this._onChange

            });

        },



        _destroyEventHandlers: function () {

            this._off(this.options.dropZone, 'dragover drop');

            this._off(this.options.pasteZone, 'paste');

            this._off(this.options.fileInput, 'change');

        },



        _setOption: function (key, value) {

            var refresh = $.inArray(key, this._refreshOptionsList) !== -1;

            if (refresh) {

                this._destroyEventHandlers();

            }

            this._super(key, value);

            if (refresh) {

                this._initSpecialOptions();

                this._initEventHandlers();

            }

        },



        _initSpecialOptions: function () {

            var options = this.options;

            if (options.fileInput === undefined) {

                options.fileInput = this.element.is('input[type="file"]') ?

                        this.element : this.element.find('input[type="file"]');

            } else if (!(options.fileInput instanceof $)) {

                options.fileInput = $(options.fileInput);

            }

            if (!(options.dropZone instanceof $)) {

                options.dropZone = $(options.dropZone);

            }

            if (!(options.pasteZone instanceof $)) {

                options.pasteZone = $(options.pasteZone);

            }

        },



        _create: function () {

            var options = this.options;

            // Initialize options set via HTML5 data-attributes:

            $.extend(options, $(this.element[0].cloneNode(false)).data());

            this._initSpecialOptions();

            this._slots = [];

            this._sequence = this._getXHRPromise(true);

            this._sending = this._active = 0;

            this._initProgressObject(this);

            this._initEventHandlers();

        },



        // This method is exposed to the widget API and allows to query

        // the number of active uploads:

        active: function () {

            return this._active;

        },



        // This method is exposed to the widget API and allows to query

        // the widget upload progress.

        // It returns an object with loaded, total and bitrate properties

        // for the running uploads:

        progress: function () {

            return this._progress;

        },



        // This method is exposed to the widget API and allows adding files

        // using the fileupload API. The data parameter accepts an object which

        // must have a files property and can contain additional options:

        // .fileupload('add', {files: filesList});

        add: function (data) {

            var that = this;

            if (!data || this.options.disabled) {

                return;

            }

            if (data.fileInput && !data.files) {

                this._getFileInputFiles(data.fileInput).always(function (files) {

                    data.files = files;

                    that._onAdd(null, data);

                });

            } else {

                data.files = $.makeArray(data.files);

                this._onAdd(null, data);

            }

        },



        // This method is exposed to the widget API and allows sending files

        // using the fileupload API. The data parameter accepts an object which

        // must have a files or fileInput property and can contain additional options:

        // .fileupload('send', {files: filesList});

        // The method returns a Promise object for the file upload call.

        send: function (data) {

            if (data && !this.options.disabled) {

                if (data.fileInput && !data.files) {

                    var that = this,

                        dfd = $.Deferred(),

                        promise = dfd.promise(),

                        jqXHR,

                        aborted;

                    promise.abort = function () {

                        aborted = true;

                        if (jqXHR) {

                            return jqXHR.abort();

                        }

                        dfd.reject(null, 'abort', 'abort');

                        return promise;

                    };

                    this._getFileInputFiles(data.fileInput).always(

                        function (files) {

                            if (aborted) {

                                return;

                            }

                            data.files = files;

                            jqXHR = that._onSend(null, data).then(

                                function (result, textStatus, jqXHR) {

                                    dfd.resolve(result, textStatus, jqXHR);

                                },

                                function (jqXHR, textStatus, errorThrown) {

                                    dfd.reject(jqXHR, textStatus, errorThrown);

                                }

                            );

                        }

                    );

                    return this._enhancePromise(promise);

                }

                data.files = $.makeArray(data.files);

                if (data.files.length) {

                    return this._onSend(null, data);

                }

            }

            return this._getXHRPromise(false, data && data.context);

        }



    });



}));

