(function($) {
        jQuery.fn.html5_upload = function(options) {

                var available_events = ['onStart', 'onStartOne', 'onProgress', 'onFinishOne', 'onFinish', 'onError'];
                var options = jQuery.extend({
                        onStart: function(event, total) {
                                return true;
                        },
                        onStartOne: function(event, name, number, total) {
                                return true;
                        },
                        onProgress: function(event, progress, name, number, total) {
                        },
                        onFinishOne: function(event, response, name, number, total) {
                        },
                        onFinish: function(event, total) {
                        },
                        onError: function(event, name, error) {
                        },
                        onBrowserIncompatible: function() {
                                alert("Sorry, but your browser is incompatible with uploading files using HTML5 (at least, with current preferences.\n Please install the latest version of Firefox, Safari or Chrome");
                        },
                        autostart: true,
                        autoclear: true,
                        stopOnFirstError: false,
                        sendBoundary: false,
                        fieldName: 'user_file[]',//ignore if sendBoundary is false
                        method: 'post',

                        STATUSES: {
                                'STARTED':              'started',
                                'PROGRESS':             'progress',
                                'LOADED':               'loaded',
                                'FINISHED':             'finished'
                        },

                        setName: function(text) {},
                        setStatus: function(text) {},
                        setProgress: function(value) {},

                        genName: function(file, number, total) {
                                return file + "(" + (number+1) + " of " + total + ")";
                        },
                        genStatus: function(progress, finished) {
                                if (finished) {
                                        return options.STATUSES['FINISHED'];
                                }
                                if (progress == 0) {
                                        return options.STATUSES['STARTED'];
                                }
                                else if (progress == 1) {
                                        return options.STATUSES['LOADED'];
                                }
                                else {
                                        return options.STATUSES['PROGRESS'];
                                }
                        },
                        genProgress: function(loaded, total) {
                                return loaded / total;
                        }
                }, options);

                function upload() {
                        var files = this.files;
                        var total = files.length;
                        var $this = $(this);
                        if (!$this.triggerHandler('html5_upload.onStart', [total])) {
                                return false;
                        }
                        this.disabled = true;
                        var uploaded = 0;
                        var xhr = this.html5_upload['xhr'];
                        this.html5_upload['continue_after_abort'] = true;
                        function upload_file(number) {
                                if (number == total) {
                                        $this.trigger('html5_upload.onFinish', [total]);
                                        options.setStatus(options.genStatus(1, true));
                                        $this.attr("disabled", false);
                                        if (options.autoclear) {
                                                $this.val("");
                                        }
                                        return;
                                }
                                var file = files[number];
                                if (!$this.triggerHandler('html5_upload.onStartOne', [file.fileName, number, total])) {
                                        return upload_file(number+1);
                                }
                                options.setStatus(options.genStatus(0));
                                options.setName(options.genName(file.fileName, number, total));
                                options.setProgress(options.genProgress(0, file.fileSize));
                                xhr.upload['onprogress'] = function(rpe) {
                                        $this.trigger('html5_upload.onProgress', [rpe.loaded / rpe.total, file.fileName, number, total]);
                                        options.setStatus(options.genStatus(rpe.loaded / rpe.total));
                                        options.setProgress(options.genProgress(rpe.loaded, rpe.total));
                                };
                                xhr.onload = function(load) {
                                        $this.trigger('html5_upload.onFinishOne', [xhr.responseText, file.fileName, number, total]);
                                        options.setStatus(options.genStatus(1, true));
                                        options.setProgress(options.genProgress(file.fileSize, file.fileSize));
                                        upload_file(number+1);
                                };
                                xhr.onabort = function() {
                                        if ($this[0].html5_upload['continue_after_abort']) {
                                                upload_file(number+1);
                                        }
                                        else {
                                                $this.attr("disabled", false);
                                                if (options.autoclear) {
                                                        $this.val("");
                                                }
                                        }
                                };
                                xhr.onerror = function(e) {
                                        $this.trigger('html5_upload.onError', [file.fileName, e]);
                                        if (!options.stopOnFirstError) {
                                                upload_file(number+1);
                                        }
                                };
                                xhr.open(options.method, typeof(options.url) == "function" ? options.url(number) : options.url, true);
                                xhr.setRequestHeader("Cache-Control", "no-cache");
                                xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
                                xhr.setRequestHeader("X-File-Name", file.fileName);
                                xhr.setRequestHeader("X-File-Size", file.fileSize);

                                if (!options.sendBoundary) {
                                        xhr.setRequestHeader("Content-Type", "multipart/form-data");
                                        xhr.send(file);
                                }
                                else {
                                        if (window.FormData) {//Many thanks to scottt.tw
                                                var f = new FormData();
                                                f.append(typeof(options.fieldName) == "function" ? options.fieldName() : options.fieldName, file);
                                                xhr.send(f);
                                        }
                                        else if (file.getAsBinary) {//Thanks to jm.schelcher
                                                var boundary = '------multipartformboundary' + (new Date).getTime();
                                                var dashdash = '--';
                                                var crlf     = '\r\n';

                                                /* Build RFC2388 string. */
                                                var builder = '';

                                                builder += dashdash;
                                                builder += boundary;
                                                builder += crlf;

                                                builder += 'Content-Disposition: form-data; name="'+(typeof(options.fieldName) == "function" ? options.fieldName() : options.fieldName)+'"';
                                                builder += '; filename="' + file.fileName + '"';
                                                builder += crlf;

                                                builder += 'Content-Type: application/octet-stream';
                                                builder += crlf;
                                                builder += crlf;

                                                /* Append binary data. */
                                                builder += file.getAsBinary();
                                                builder += crlf;

                                                /* Write boundary. */
                                                builder += dashdash;
                                                builder += boundary;
                                                builder += dashdash;
                                                builder += crlf;

                                                xhr.setRequestHeader('content-type', 'multipart/form-data; boundary=' + boundary);
                                                xhr.sendAsBinary(builder);
                                        }
                                        else {
                                                options.onBrowserIncompatible();
                                        }
                                }
                        }
                        upload_file(0);
                        return true;
                }

                return this.each(function() {
                        this.html5_upload = {
                                xhr:                                    new XMLHttpRequest(),
                                continue_after_abort:   true
                        };
                        if (options.autostart) {
                                $(this).bind('change', upload);
                        }
                        for (event in available_events) {
                                if (options[available_events[event]]) {
                                        $(this).bind("html5_upload."+available_events[event], options[available_events[event]]);
                                }
                        }
                        $(this)
                                .bind('html5_upload.start', upload)
                                .bind('html5_upload.cancelOne', function() {
                                        this.html5_upload['xhr'].abort();
                                })
                                .bind('html5_upload.cancelAll', function() {
                                        this.html5_upload['continue_after_abort'] = false;
                                        this.html5_upload['xhr'].abort();
                                })
                                .bind('html5_upload.destroy', function() {
                                        this.html5_upload['continue_after_abort'] = false;
                                        this.xhr.abort();
                                        delete this.html5_upload;
                                        $(this).unbind('html5_upload.*').unbind('change', upload);
                                });
                });
        };
})(jQuery);