    /**
     * The subclasses of this class provide actions to perform upon {@link Ext.form.Basic Form}s.
     *
     * Instances of this class are only created by a {@link Ext.form.Basic Form} when the Form needs to perform an action
     * such as submit or load. The Configuration options listed for this class are set through the Form's action methods:
     * {@link Ext.form.Basic#submit submit}, {@link Ext.form.Basic#load load} and {@link Ext.form.Basic#doAction doAction}
     *
     * The instance of Action which performed the action is passed to the success and failure callbacks of the Form's action
     * methods ({@link Ext.form.Basic#submit submit}, {@link Ext.form.Basic#load load} and
     * {@link Ext.form.Basic#doAction doAction}), and to the {@link Ext.form.Basic#actioncomplete actioncomplete} and
     * {@link Ext.form.Basic#actionfailed actionfailed} event handlers.
     */
    Ext.define('Ext.form.action.Action', {
        alternateClassName: 'Ext.form.Action',

        /**
         * @cfg {Ext.form.Basic} form
         * The {@link Ext.form.Basic BasicForm} instance that is invoking this Action. Required.
         */

        /**
         * @cfg {String} url
         * The URL that the Action is to invoke. Will default to the {@link Ext.form.Basic#url url} configured on the
         * {@link #form}.
         */

        /**
         * @cfg {Boolean} reset
         * When set to **true**, causes the Form to be {@link Ext.form.Basic#reset reset} on Action success. If specified,
         * this happens before the {@link #success} callback is called and before the Form's
         * {@link Ext.form.Basic#actioncomplete actioncomplete} event fires.
         */

        /**
         * @cfg {String} method
         * The HTTP method to use to access the requested URL.
         * Defaults to the {@link Ext.form.Basic#method BasicForm's method}, or 'POST' if not specified.
         */

        /**
         * @cfg {Object/String} params
         * Extra parameter values to pass. These are added to the Form's {@link Ext.form.Basic#baseParams} and passed to the
         * specified URL along with the Form's input fields.
         *
         * Parameters are encoded as standard HTTP parameters using {@link Ext#urlEncode Ext.Object.toQueryString}.
         */

        /**
         * @cfg {Object} headers
         * Extra headers to be sent in the AJAX request for submit and load actions.
         * See {@link Ext.data.proxy.Ajax#headers}.
         *
         * **Note:** Headers are not sent during file upload.
         */

        /**
         * @cfg {Number} timeout
         * The number of seconds to wait for a server response before failing with the {@link #failureType} as
         * {@link Ext.form.action.Action#CONNECT_FAILURE}. If not specified, defaults to the configured
         * {@link Ext.form.Basic#timeout timeout} of the {@link #form}.
         */

        /**
         * @cfg {Function} success
         * The function to call when a valid success return packet is received.
         * @cfg {Ext.form.Basic} success.form The form that requested the action
         * @cfg {Ext.form.action.Action} success.action The Action class. The {@link #result} property of this object may
         * be examined to perform custom postprocessing.
         */

        /**
         * @cfg {Function} failure
         * The function to call when a failure packet was received, or when an error ocurred in the Ajax communication.
         * @cfg {Ext.form.Basic} failure.form The form that requested the action
         * @cfg {Ext.form.action.Action} failure.action The Action class. If an Ajax error ocurred, the failure type will
         * be in {@link #failureType}. The {@link #result} property of this object may be examined to perform custom
         * postprocessing.
         */

        /**
         * @cfg {Object} scope
         * The scope in which to call the configured #success and #failure callback functions
         * (the `this` reference for the callback functions).
         */

        /**
         * @cfg {String} waitMsg
         * The message to be displayed by a call to {@link Ext.window.MessageBox#wait} during the time the action is being
         * processed.
         */

        /**
         * @cfg {String} waitTitle
         * The title to be displayed by a call to {@link Ext.window.MessageBox#wait} during the time the action is being
         * processed.
         */

        /**
         * @cfg {Boolean} submitEmptyText
         * If set to true, the emptyText value will be sent with the form when it is submitted.
         */
        submitEmptyText : true,

        /**
         * @property {String} type
         * The type of action this Action instance performs. Currently only "submit" and "load" are supported.
         */

        /**
         * @property {String} failureType
         * The type of failure detected will be one of these:
         * {@link #CLIENT_INVALID}, {@link #SERVER_INVALID}, {@link #CONNECT_FAILURE}, or {@link #LOAD_FAILURE}.
         *
         * Usage:
         *
         *     var fp = new Ext.form.Panel({
         *     ...
         *     buttons: [{
         *         text: 'Save',
         *         formBind: true,
         *         handler: function(){
         *             if(fp.getForm().isValid()){
         *                 fp.getForm().submit({
         *                     url: 'form-submit.php',
         *                     waitMsg: 'Submitting your data...',
         *                     success: function(form, action){
         *                         // server responded with success = true
         *                         var result = action.{@link #result};
         *                     },
         *                     failure: function(form, action){
         *                         if (action.{@link #failureType} === Ext.form.action.Action.CONNECT_FAILURE) {
         *                             Ext.Msg.alert('Error',
         *                                 'Status:'+action.{@link #response}.status+': '+
         *                                 action.{@link #response}.statusText);
         *                         }
         *                         if (action.failureType === Ext.form.action.Action.SERVER_INVALID){
         *                             // server responded with success = false
         *                             Ext.Msg.alert('Invalid', action.{@link #result}.errormsg);
         *                         }
         *                     }
         *                 });
         *             }
         *         }
         *     },{
         *         text: 'Reset',
         *         handler: function(){
         *             fp.getForm().reset();
         *         }
         *     }]
         */

        /**
         * @property {Object} response
         * The raw XMLHttpRequest object used to perform the action.
         */

        /**
         * @property {Object} result
         * The decoded response object containing a boolean `success` property and other, action-specific properties.
         */

        /**
         * Creates new Action.
         * @param {Object} [config] Config object.
         */
        constructor: function(config) {
            if (config) {
                Ext.apply(this, config);
            }

            // Normalize the params option to an Object
            var params = config.params;
            if (Ext.isString(params)) {
                this.params = Ext.Object.fromQueryString(params);
            }
        },

        /**
         * @method
         * Invokes this action using the current configuration.
         */
        run: Ext.emptyFn,

        /**
         * @private
         * @method onSuccess
         * Callback method that gets invoked when the action completes successfully. Must be implemented by subclasses.
         * @param {Object} response
         */

        /**
         * @private
         * @method handleResponse
         * Handles the raw response and builds a result object from it. Must be implemented by subclasses.
         * @param {Object} response
         */

        /**
         * @private
         * Handles a failure response.
         * @param {Object} response
         */
        onFailure : function(response){
            this.response = response;
            this.failureType = Ext.form.action.Action.CONNECT_FAILURE;
            this.form.afterAction(this, false);
        },

        /**
         * @private
         * Validates that a response contains either responseText or responseXML and invokes
         * {@link #handleResponse} to build the result object.
         * @param {Object} response The raw response object.
         * @return {Object/Boolean} The result object as built by handleResponse, or `true` if
         * the response had empty responseText and responseXML.
         */
        processResponse : function(response){
            this.response = response;
            if (!response.responseText && !response.responseXML) {
                return true;
            }
            return (this.result = this.handleResponse(response));
        },

        /**
         * @private
         * Build the URL for the AJAX request. Used by the standard AJAX submit and load actions.
         * @return {String} The URL.
         */
        getUrl: function() {
            return this.url || this.form.url;
        },

        /**
         * @private
         * Determine the HTTP method to be used for the request.
         * @return {String} The HTTP method
         */
        getMethod: function() {
            return (this.method || this.form.method || 'POST').toUpperCase();
        },

        /**
         * @private
         * Get the set of parameters specified in the BasicForm's baseParams and/or the params option.
         * Items in params override items of the same name in baseParams.
         * @return {Object} the full set of parameters
         */
        getParams: function() {
            return Ext.apply({}, this.params, this.form.baseParams);
        },

        /**
         * @private
         * Creates a callback object.
         */
        createCallback: function() {
            var me = this,
                undef,
                form = me.form;
            return {
                success: me.onSuccess,
                failure: me.onFailure,
                scope: me,
                timeout: (this.timeout * 1000) || (form.timeout * 1000),
                upload: form.fileUpload ? me.onSuccess : undef
            };
        },

        statics: {
            /**
             * @property
             * Failure type returned when client side validation of the Form fails thus aborting a submit action. Client
             * side validation is performed unless {@link Ext.form.action.Submit#clientValidation} is explicitly set to
             * false.
             * @static
             */
            CLIENT_INVALID: 'client',

            /**
             * @property
             * Failure type returned when server side processing fails and the {@link #result}'s `success` property is set to
             * false.
             *
             * In the case of a form submission, field-specific error messages may be returned in the {@link #result}'s
             * errors property.
             * @static
             */
            SERVER_INVALID: 'server',

            /**
             * @property
             * Failure type returned when a communication error happens when attempting to send a request to the remote
             * server. The {@link #response} may be examined to provide further information.
             * @static
             */
            CONNECT_FAILURE: 'connect',

            /**
             * @property
             * Failure type returned when the response's `success` property is set to false, or no field values are returned
             * in the response's data property.
             * @static
             */
            LOAD_FAILURE: 'load'

        }
    });