/**
 * @class Ext.form.action.Action
 * @extends Ext.Base
 * 
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.
 * @constructor
 * @param {Object} config The configuration for this instance.
 */
Ext.define('Ext.form.action.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}.
     */

    
/**
     * @cfg {Object} headers 
Extra headers to be sent in the AJAX request for submit and load actions. See
     * {@link Ext.data.Connection#headers}.
     */

    
/**
     * @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.
     * The function is passed the following parameters:

     * 
form : Ext.form.Basic
The form that requested the action
     * 
action : Ext.form.action.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.
     * The function is passed the following parameters:

     * 
form : Ext.form.Basic
The form that requested the action
     * 
action : Ext.form.action.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.MessageBox#wait}
     * during the time the action is being processed.
     */

    
/**
     * @cfg {String} waitTitle The title to be displayed by a call to {@link Ext.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. Defaults to true.
     */

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

    
/**
     * The type of failure detected will be one of these: {@link Ext.form.action.Action.CLIENT_INVALID},
     * {@link Ext.form.action.Action.SERVER_INVALID}, {@link Ext.form.action.Action.CONNECT_FAILURE}, or
     * {@link Ext.form.action.Action.LOAD_FAILURE}.  Usage:
     * 

var fp = new Ext.form.FormPanel({
...
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.{@link 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.{@link 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 failureType
     * @type {String}
     */

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

    
/**
     * The decoded response object containing a boolean success property and
     * other, action-specific properties.
     * @property result
     * @type {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.urlDecode(params);
        }
    },

    
/**
     * 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} result 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 CLIENT_INVALID
         * 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.
         * @type {String}
         * @static
         */
        CLIENT_INVALID: 'client',

        
/**
         * @property SERVER_INVALID
         * 
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.
         * @type {String}
         * @static
         */
        SERVER_INVALID: 'server',

        
/**
         * @property CONNECT_FAILURE
         * 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.
         * @type {String}
         * @static
         */
        CONNECT_FAILURE: 'connect',

        
/**
         * @property LOAD_FAILURE
         * 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.
         * @type {String}
         * @static
         */
        LOAD_FAILURE: 'load'


    }
});