/**
 * @author Ed Spencer
 * @aside guide proxies
 *
 * The JsonP proxy is useful when you need to load data from a domain other than the one your application is running on. If
 * your application is running on http://domainA.com it cannot use {@link Ext.data.proxy.Ajax Ajax} to load its data
 * from http://domainB.com because cross-domain ajax requests are prohibited by the browser.
 *
 * We can get around this using a JsonP proxy. JsonP proxy injects a `<script>` tag into the DOM whenever an AJAX request
 * would usually be made. Let's say we want to load data from http://domainB.com/users - the script tag that would be
 * injected might look like this:
 *
 *     <script src="http://domainB.com/users?callback=someCallback"></script>
 *
 * When we inject the tag above, the browser makes a request to that url and includes the response as if it was any
 * other type of JavaScript include. By passing a callback in the url above, we're telling domainB's server that we want
 * to be notified when the result comes in and that it should call our callback function with the data it sends back. So
 * long as the server formats the response to look like this, everything will work:
 *
 *     someCallback({
 *         users: [
 *             {
 *                 id: 1,
 *                 name: "Ed Spencer",
 *                 email: "ed@sencha.com"
 *             }
 *         ]
 *     });
 *
 * As soon as the script finishes loading, the 'someCallback' function that we passed in the url is called with the JSON
 * object that the server returned.
 *
 * JsonP proxy takes care of all of this automatically. It formats the url you pass, adding the callback parameter
 * automatically. It even creates a temporary callback function, waits for it to be called and then puts the data into
 * the Proxy making it look just like you loaded it through a normal {@link Ext.data.proxy.Ajax AjaxProxy}. Here's how
 * we might set that up:
 *
 *     Ext.define('User', {
 *         extend: 'Ext.data.Model',
 *         config: {
 *             fields: ['id', 'name', 'email']
 *         }
 *     });
 *
 *     var store = Ext.create('Ext.data.Store', {
 *         model: 'User',
 *         proxy: {
 *             type: 'jsonp',
 *             url : 'http://domainB.com/users'
 *         }
 *     });
 *
 *     store.load();
 *
 * That's all we need to do - JsonP proxy takes care of the rest. In this case the Proxy will have injected a script tag
 * like this:
 *
 *     <script src="http://domainB.com/users?callback=callback1"></script>
 *
 * # Customization
 *
 * This script tag can be customized using the {@link #callbackKey} configuration. For example:
 *
 *     var store = Ext.create('Ext.data.Store', {
 *         model: 'User',
 *         proxy: {
 *             type: 'jsonp',
 *             url : 'http://domainB.com/users',
 *             callbackKey: 'theCallbackFunction'
 *         }
 *     });
 *
 *     store.load();
 *
 * Would inject a script tag like this:
 *
 *     <script src="http://domainB.com/users?theCallbackFunction=callback1"></script>
 *
 * # Implementing on the server side
 *
 * The remote server side needs to be configured to return data in this format. Here are suggestions for how you might
 * achieve this using Java, PHP and ASP.net:
 *
 * Java:
 *
 *     boolean jsonP = false;
 *     String cb = request.getParameter("callback");
 *     if (cb != null) {
 *         jsonP = true;
 *         response.setContentType("text/javascript");
 *     } else {
 *         response.setContentType("application/x-json");
 *     }
 *     Writer out = response.getWriter();
 *     if (jsonP) {
 *         out.write(cb + "(");
 *     }
 *     out.print(dataBlock.toJsonString());
 *     if (jsonP) {
 *         out.write(");");
 *     }
 *
 * PHP:
 *
 *     $callback = $_REQUEST['callback'];
 *
 *     // Create the output object.
 *     $output = array('a' => 'Apple', 'b' => 'Banana');
 *
 *     //start output
 *     if ($callback) {
 *         header('Content-Type: text/javascript');
 *         echo $callback . '(' . json_encode($output) . ');';
 *     } else {
 *         header('Content-Type: application/x-json');
 *         echo json_encode($output);
 *     }
 *
 * ASP.net:
 *
 *     String jsonString = "{success: true}";
 *     String cb = Request.Params.Get("callback");
 *     String responseString = "";
 *     if (!String.IsNullOrEmpty(cb)) {
 *         responseString = cb + "(" + jsonString + ")";
 *     } else {
 *         responseString = jsonString;
 *     }
 *     Response.Write(responseString);
 */
Ext.define('Ext.data.proxy.JsonP', {
    extend: 'Ext.data.proxy.Server',
    alternateClassName: 'Ext.data.ScriptTagProxy',
    alias: ['proxy.jsonp', 'proxy.scripttag'],
    requires: ['Ext.data.JsonP'],

    config: {
        defaultWriterType: 'base',

        /**
         * @cfg {String} callbackKey
         * See {@link Ext.data.JsonP#callbackKey}.
         * @accessor
         */
        callbackKey : 'callback',

        /**
         * @cfg {String} recordParam
         * The param name to use when passing records to the server (e.g. 'records=someEncodedRecordString').
         * @accessor
         */
        recordParam: 'records',

        /**
         * @cfg {Boolean} autoAppendParams
         * `true` to automatically append the request's params to the generated url.
         * @accessor
         */
        autoAppendParams: true
    },

    /**
     * Performs the read request to the remote domain. JsonP proxy does not actually create an Ajax request,
     * instead we write out a `<script>` tag based on the configuration of the internal Ext.data.Request object
     * @param {Ext.data.Operation} operation The {@link Ext.data.Operation Operation} object to execute.
     * @param {Function} callback A callback function to execute when the Operation has been completed.
     * @param {Object} scope The scope to execute the callback in.
     * @return {Object}
     * @protected
     */
    doRequest: function(operation, callback, scope) {
        // <debug>
        var action = operation.getAction();
        if (action !== 'read') {
            Ext.Logger.error('JsonP proxies can only be used to read data.');
        }
        // </debug>

        //generate the unique IDs for this request
        var me      = this,
            request = me.buildRequest(operation),
            params  = request.getParams();

        // apply JsonP proxy-specific attributes to the Request
        request.setConfig({
            callbackKey: me.getCallbackKey(),
            timeout: me.getTimeout(),
            scope: me,
            callback: me.createRequestCallback(request, operation, callback, scope)
        });

        // Prevent doubling up because the params are already added to the url in buildUrl
        if (me.getAutoAppendParams()) {
            request.setParams({});
        }

        request.setJsonP(Ext.data.JsonP.request(request.getCurrentConfig()));

        // Set the params back once we have made the request though
        request.setParams(params);

        operation.setStarted();

        me.lastRequest = request;

        return request;
    },

    /**
     * @private
     * Creates and returns the function that is called when the request has completed. The returned function
     * should accept a Response object, which contains the response to be read by the configured Reader.
     * The third argument is the callback that should be called after the request has been completed and the Reader has decoded
     * the response. This callback will typically be the callback passed by a store, e.g. in proxy.read(operation, theCallback, scope)
     * theCallback refers to the callback argument received by this function.
     * See {@link #doRequest} for details.
     * @param {Ext.data.Request} request The Request object.
     * @param {Ext.data.Operation} operation The Operation being executed.
     * @param {Function} callback The callback function to be called when the request completes. This is usually the callback
     * passed to doRequest.
     * @param {Object} scope The scope in which to execute the callback function.
     * @return {Function} The callback function.
     */
    createRequestCallback: function(request, operation, callback, scope) {
        var me = this;

        return function(success, response, errorType) {
            delete me.lastRequest;
            me.processResponse(success, operation, request, response, callback, scope);
        };
    },

    // @inheritdoc
    setException: function(operation, response) {
        operation.setException(operation.getRequest().getJsonP().errorType);
    },


    /**
     * Generates a url based on a given Ext.data.Request object. Adds the params and callback function name to the url
     * @param {Ext.data.Request} request The request object.
     * @return {String} The url.
     */
    buildUrl: function(request) {
        var me      = this,
            url     = me.callParent(arguments),
            params  = Ext.apply({}, request.getParams()),
            filters = params.filters,
            filter, i, value;

        delete params.filters;

        if (me.getAutoAppendParams()) {
            url = Ext.urlAppend(url, Ext.Object.toQueryString(params));
        }

        if (filters && filters.length) {
            for (i = 0; i < filters.length; i++) {
                filter = filters[i];
                value = filter.getValue();
                if (value) {
                    url = Ext.urlAppend(url, filter.getProperty() + "=" + value);
                }
            }
        }

        return url;
    },

    /**
     * @inheritdoc
     */
    destroy: function() {
        this.abort();
        this.callParent(arguments);
    },

    /**
     * Aborts the current server request if one is currently running.
     */
    abort: function() {
        var lastRequest = this.lastRequest;
        if (lastRequest) {
            Ext.data.JsonP.abort(lastRequest.getJsonP());
        }
    }
});
