/*
 * Verto HTML5/Javascript Telephony Signaling and Control Protocol Stack for FreeSWITCH
 * Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is jquery.jsonrpclient.js modified for Verto HTML5/Javascript Telephony Signaling and Control Protocol Stack for FreeSWITCH
 *
 * The Initial Developer of the Original Code is
 * Textalk AB http://textalk.se/
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Anthony Minessale II <anthm@freeswitch.org>
 *
 * jquery.jsonrpclient.js - JSON RPC client code
 *
 */
/**
 * This plugin requires jquery.json.js to be available, or at least the methods $.toJSON and
 * $.parseJSON.
 *
 * The plan is to make use of websockets if they are available, but work just as well with only
 * http if not.
 *
 * Usage example:
 *
 *   var foo = new $.JsonRpcClient({ ajaxUrl: '/backend/jsonrpc' });
 *   foo.call(
 *     'bar', [ 'A parameter', 'B parameter' ],
 *     function(result) { alert('Foo bar answered: ' + result.my_answer); },
 *     function(error)  { console.log('There was an error', error); }
 *   );
 *
 * More examples are available in README.md
 */
(function($) {
  /**
   * @fn new
   * @memberof $.JsonRpcClient
   *
   * @param options An object stating the backends:
   *                ajaxUrl    A url (relative or absolute) to a http(s) backend.
   *                socketUrl  A url (relative of absolute) to a ws(s) backend.
   *                onmessage  A socket message handler for other messages (non-responses).
   *                getSocket  A function returning a WebSocket or null.
   *                           It must take an onmessage_cb and bind it to the onmessage event
   *                           (or chain it before/after some other onmessage handler).
   *                           Or, it could return null if no socket is available.
   *                           The returned instance must have readyState <= 1, and if less than 1,
   *                           react to onopen binding.
   */
    $.JsonRpcClient = function(options) {
        var self = this;
        this.options = $.extend({
            ajaxUrl       : null,
            socketUrl     : null, ///< The ws-url for default getSocket.
            onmessage     : null, ///< Other onmessage-handler.
            login         : null, /// auth login
            passwd        : null, /// auth passwd
            sessid        : null,
	    loginParams   : null,
	    userVariables : null,
            getSocket     : function(onmessage_cb) { return self._getSocket(onmessage_cb); }
        }, options);

        self.ws_cnt = 0;

        // Declare an instance version of the onmessage callback to wrap 'this'.
        this.wsOnMessage = function(event) { self._wsOnMessage(event); };
    };

    /// Holding the WebSocket on default getsocket.
    $.JsonRpcClient.prototype._ws_socket = null;

    /// Object <id>: { success_cb: cb, error_cb: cb }
    $.JsonRpcClient.prototype._ws_callbacks = {};

    /// The next JSON-RPC request id.
    $.JsonRpcClient.prototype._current_id = 1;

    /**
     * @fn call
     * @memberof $.JsonRpcClient
     *
     * @param method     The method to run on JSON-RPC server.
     * @param params     The params; an array or object.
     * @param success_cb A callback for successful request.
     * @param error_cb   A callback for error.
     */
    $.JsonRpcClient.prototype.call = function(method, params, success_cb, error_cb) {
    // Construct the JSON-RPC 2.0 request.

        if (!params) {
            params = {};
        }

        if (this.options.sessid) {
            params.sessid = this.options.sessid;
        }

        var request = {
            jsonrpc : '2.0',
            method  : method,
            params  : params,
            id      : this._current_id++  // Increase the id counter to match request/response
        };

        if (!success_cb) {
            success_cb = function(e){console.log("Success: ", e);};
        }

        if (!error_cb) {
            error_cb = function(e){console.log("Error: ", e);};
        }

        // Try making a WebSocket call.
        var socket = this.options.getSocket(this.wsOnMessage);
        if (socket !== null) {
            this._wsCall(socket, request, success_cb, error_cb);
            return;
        }

        // No WebSocket, and no HTTP backend?  This won't work.
        if (this.options.ajaxUrl === null) {
            throw "$.JsonRpcClient.call used with no websocket and no http endpoint.";
        }

        $.ajax({
            type     : 'POST',
            url      : this.options.ajaxUrl,
            data     : $.toJSON(request),
            dataType : 'json',
            cache    : false,

            success  : function(data) {
                if ('error' in data) error_cb(data.error, this);
                success_cb(data.result, this);
            },

            // JSON-RPC Server could return non-200 on error
            error    : function(jqXHR, textStatus, errorThrown) {
                try {
                    var response = $.parseJSON(jqXHR.responseText);

                    if ('console' in window) console.log(response);

                    error_cb(response.error, this);
                } catch (err) {
                    // Perhaps the responseText wasn't really a jsonrpc-error.
                    error_cb({ error: jqXHR.responseText }, this);
                }
            }
        });
    };

    /**
     * Notify sends a command to the server that won't need a response.  In http, there is probably
     * an empty response - that will be dropped, but in ws there should be no response at all.
     *
     * This is very similar to call, but has no id and no handling of callbacks.
     *
     * @fn notify
     * @memberof $.JsonRpcClient
     *
     * @param method     The method to run on JSON-RPC server.
     * @param params     The params; an array or object.
     */
    $.JsonRpcClient.prototype.notify = function(method, params) {
        // Construct the JSON-RPC 2.0 request.

        if (this.options.sessid) {
            params.sessid = this.options.sessid;
        }

        var request = {
            jsonrpc: '2.0',
            method:  method,
            params:  params
        };

        // Try making a WebSocket call.
        var socket = this.options.getSocket(this.wsOnMessage);
        if (socket !== null) {
            this._wsCall(socket, request);
            return;
        }

        // No WebSocket, and no HTTP backend?  This won't work.
        if (this.options.ajaxUrl === null) {
            throw "$.JsonRpcClient.notify used with no websocket and no http endpoint.";
        }

        $.ajax({
            type     : 'POST',
            url      : this.options.ajaxUrl,
            data     : $.toJSON(request),
            dataType : 'json',
            cache    : false
        });
    };

    /**
     * Make a batch-call by using a callback.
     *
     * The callback will get an object "batch" as only argument.  On batch, you can call the methods
     * "call" and "notify" just as if it was a normal $.JsonRpcClient object, and all calls will be
     * sent as a batch call then the callback is done.
     *
     * @fn batch
     * @memberof $.JsonRpcClient
     *
     * @param callback    The main function which will get a batch handler to run call and notify on.
     * @param all_done_cb A callback function to call after all results have been handled.
     * @param error_cb    A callback function to call if there is an error from the server.
     *                    Note, that batch calls should always get an overall success, and the
     *                    only error
     */
    $.JsonRpcClient.prototype.batch = function(callback, all_done_cb, error_cb) {
        var batch = new $.JsonRpcClient._batchObject(this, all_done_cb, error_cb);
        callback(batch);
        batch._execute();
    };

    /**
     * The default getSocket handler.
     *
     * @param onmessage_cb The callback to be bound to onmessage events on the socket.
     *
     * @fn _getSocket
     * @memberof $.JsonRpcClient
     */

    $.JsonRpcClient.prototype.socketReady = function() {
        if (this._ws_socket === null || this._ws_socket.readyState > 1) {
            return false;
        }

        return true;
    };

    $.JsonRpcClient.prototype.closeSocket = function() {
	var self = this;
        if (self.socketReady()) {
            self._ws_socket.onclose = function (w) {console.log("Closing Socket");};
            self._ws_socket.close();
        }
    };

    $.JsonRpcClient.prototype.loginData = function(params) {
	var self = this;
        self.options.login = params.login;
        self.options.passwd = params.passwd;
	self.options.loginParams = params.loginParams;
	self.options.userVariables = params.userVariables;
    };

    $.JsonRpcClient.prototype.connectSocket = function(onmessage_cb) {
        var self = this;

        if (self.to) {
            clearTimeout(self.to);
        }

        if (!self.socketReady()) {
            self.authing = false;

            if (self._ws_socket) {
                delete self._ws_socket;
            }

            // No socket, or dying socket, let's get a new one.
            self._ws_socket = new WebSocket(self.options.socketUrl);

            if (self._ws_socket) {
                // Set up onmessage handler.
                self._ws_socket.onmessage = onmessage_cb;
                self._ws_socket.onclose = function (w) {
                    if (!self.ws_sleep) {
                        self.ws_sleep = 1000;
                    }

                    if (self.options.onWSClose) {
                        self.options.onWSClose(self);
                    }

                    console.error("Websocket Lost " + self.ws_cnt + " sleep: " + self.ws_sleep + "msec");

                    self.to = setTimeout(function() {
                        console.log("Attempting Reconnection....");
                        self.connectSocket(onmessage_cb);
                    }, self.ws_sleep);

                    self.ws_cnt++;

                    if (self.ws_sleep < 3000 && (self.ws_cnt % 10) === 0) {
                        self.ws_sleep += 1000;
                    }
                };

                // Set up sending of message for when the socket is open.
                self._ws_socket.onopen = function() {
                    if (self.to) {
                        clearTimeout(self.to);
                    }
                    self.ws_sleep = 1000;
                    self.ws_cnt = 0;
                    if (self.options.onWSConnect) {
                        self.options.onWSConnect(self);
                    }

                    var req;
                    // Send the requests.
                    while ((req = $.JsonRpcClient.q.pop())) {
                        self._ws_socket.send(req);
                    }
                };
            }
        }

        return self._ws_socket ? true : false;
    };

    $.JsonRpcClient.prototype._getSocket = function(onmessage_cb) {
        // If there is no ws url set, we don't have a socket.
        // Likewise, if there is no window.WebSocket.
        if (this.options.socketUrl === null || !("WebSocket" in window)) return null;

        this.connectSocket(onmessage_cb);

        return this._ws_socket;
    };

    /**
     * Queue to save messages delivered when websocket is not ready
     */
    $.JsonRpcClient.q = [];

    /**
     * Internal handler to dispatch a JRON-RPC request through a websocket.
     *
     * @fn _wsCall
     * @memberof $.JsonRpcClient
     */
    $.JsonRpcClient.prototype._wsCall = function(socket, request, success_cb, error_cb) {
        var request_json = $.toJSON(request);

        if (socket.readyState < 1) {
            // The websocket is not open yet; we have to set sending of the message in onopen.
            self = this; // In closure below, this is set to the WebSocket.  Use self instead.
            $.JsonRpcClient.q.push(request_json);
        } else {
            // We have a socket and it should be ready to send on.
            socket.send(request_json);
        }

        // Setup callbacks.  If there is an id, this is a call and not a notify.
        if ('id' in request && typeof success_cb !== 'undefined') {
            this._ws_callbacks[request.id] = { request: request_json, request_obj: request, success_cb: success_cb, error_cb: error_cb };
        }
    };

    /**
     * Internal handler for the websocket messages.  It determines if the message is a JSON-RPC
     * response, and if so, tries to couple it with a given callback.  Otherwise, it falls back to
     * given external onmessage-handler, if any.
     *
     * @param event The websocket onmessage-event.
     */
    $.JsonRpcClient.prototype._wsOnMessage = function(event) {
        // Check if this could be a JSON RPC message.
        var response;
        try {
            response = $.parseJSON(event.data);

            /// @todo Make using the jsonrcp 2.0 check optional, to use this on JSON-RPC 1 backends.

            if (typeof response === 'object' &&
                'jsonrpc' in response &&
                response.jsonrpc === '2.0') {

                /// @todo Handle bad response (without id).

                // If this is an object with result, it is a response.
                if ('result' in response && this._ws_callbacks[response.id]) {
                    // Get the success callback.
                    var success_cb = this._ws_callbacks[response.id].success_cb;

    /*
                    // set the sessid if present
                    if ('sessid' in response.result && !this.options.sessid || (this.options.sessid != response.result.sessid)) {
                        this.options.sessid = response.result.sessid;
                        if (this.options.sessid) {
                            console.log("setting session UUID to: " + this.options.sessid);
                        }
                    }
    */
                    // Delete the callback from the storage.
                    delete this._ws_callbacks[response.id];

                    // Run callback with result as parameter.
                    success_cb(response.result, this);
                    return;
                } else if ('error' in response && this._ws_callbacks[response.id]) {
                // If this is an object with error, it is an error response.

                // Get the error callback.
                    var error_cb = this._ws_callbacks[response.id].error_cb;
                    var orig_req = this._ws_callbacks[response.id].request;

                    // if this is an auth request, send the credentials and resend the failed request
                    if (!self.authing && response.error.code == -32000 && self.options.login && self.options.passwd) {
                        self.authing = true;

                        this.call("login", { login: self.options.login, passwd: self.options.passwd, loginParams: self.options.loginParams,
					     userVariables: self.options.userVariables},
                            this._ws_callbacks[response.id].request_obj.method == "login" ?
                            function(e) {
                                self.authing = false;
                                console.log("logged in");
                                delete self._ws_callbacks[response.id];

                                if (self.options.onWSLogin) {
                                    self.options.onWSLogin(true, self);
                                }
                            }

                            :

                            function(e) {
                                self.authing = false;
                                console.log("logged in, resending request id: " + response.id);
                                var socket = self.options.getSocket(self.wsOnMessage);
                                if (socket !== null) {
                                    socket.send(orig_req);
                                }
                                if (self.options.onWSLogin) {
                                    self.options.onWSLogin(true, self);
                                }
                            },

                            function(e) {
                                console.log("error logging in, request id:", response.id);
                                delete self._ws_callbacks[response.id];
                                error_cb(response.error, this);
                                if (self.options.onWSLogin) {
                                self.options.onWSLogin(false, self);
                                }
                            });
                            return;
                        }

                        // Delete the callback from the storage.
                        delete this._ws_callbacks[response.id];

                        // Run callback with the error object as parameter.
                        error_cb(response.error, this);
                        return;
                    }
                }
            } catch (err) {
            // Probably an error while parsing a non json-string as json.  All real JSON-RPC cases are
            // handled above, and the fallback method is called below.
            console.log("ERROR: "+ err);
            return;
        }

        // This is not a JSON-RPC response.  Call the fallback message handler, if given.
        if (typeof this.options.onmessage === 'function') {
            event.eventData = response;
            if (!event.eventData) {
                event.eventData = {};
            }

            var reply = this.options.onmessage(event);

            if (reply && typeof reply === "object" && event.eventData.id) {
                var msg = {
                    jsonrpc: "2.0",
                    id: event.eventData.id,
                    result: reply
                };

                var socket = self.options.getSocket(self.wsOnMessage);
                if (socket !== null) {
                    socket.send($.toJSON(msg));
                }
            }
        }
    };


    /************************************************************************************************
     * Batch object with methods
     ************************************************************************************************/

    /**
     * Handling object for batch calls.
     */
    $.JsonRpcClient._batchObject = function(jsonrpcclient, all_done_cb, error_cb) {
        // Array of objects to hold the call and notify requests.  Each objects will have the request
        // object, and unless it is a notify, success_cb and error_cb.
        this._requests   = [];

        this.jsonrpcclient = jsonrpcclient;
        this.all_done_cb = all_done_cb;
        this.error_cb    = typeof error_cb === 'function' ? error_cb : function() {};

    };

    /**
     * @sa $.JsonRpcClient.prototype.call
     */
    $.JsonRpcClient._batchObject.prototype.call = function(method, params, success_cb, error_cb) {

        if (!params) {
            params = {};
        }

        if (this.options.sessid) {
            params.sessid = this.options.sessid;
        }

        if (!success_cb) {
            success_cb = function(e){console.log("Success: ", e);};
        }

        if (!error_cb) {
        error_cb = function(e){console.log("Error: ", e);};
        }

        this._requests.push({
            request    : {
            jsonrpc : '2.0',
            method  : method,
            params  : params,
            id      : this.jsonrpcclient._current_id++  // Use the client's id series.
        },
            success_cb : success_cb,
            error_cb   : error_cb
        });
    };

    /**
     * @sa $.JsonRpcClient.prototype.notify
     */
    $.JsonRpcClient._batchObject.prototype.notify = function(method, params) {
        if (this.options.sessid) {
            params.sessid = this.options.sessid;
        }

        this._requests.push({
            request    : {
                jsonrpc : '2.0',
                method  : method,
                params  : params
            }
        });
    };

    /**
     * Executes the batched up calls.
     */
    $.JsonRpcClient._batchObject.prototype._execute = function() {
        var self = this;

        if (this._requests.length === 0) return; // All done :P

        // Collect all request data and sort handlers by request id.
        var batch_request = [];
        var handlers = {};
        var i = 0;
        var call;
        var success_cb;
        var error_cb;

        // If we have a WebSocket, just send the requests individually like normal calls.
        var socket = self.jsonrpcclient.options.getSocket(self.jsonrpcclient.wsOnMessage);
        if (socket !== null) {
            for (i = 0; i < this._requests.length; i++) {
                call = this._requests[i];
                success_cb = ('success_cb' in call) ? call.success_cb : undefined;
                error_cb   = ('error_cb'   in call) ? call.error_cb   : undefined;
                self.jsonrpcclient._wsCall(socket, call.request, success_cb, error_cb);
            }

            if (typeof all_done_cb === 'function') all_done_cb(result);
            return;
        }

        for (i = 0; i < this._requests.length; i++) {
            call = this._requests[i];
            batch_request.push(call.request);

            // If the request has an id, it should handle returns (otherwise it's a notify).
            if ('id' in call.request) {
                handlers[call.request.id] = {
                    success_cb : call.success_cb,
                    error_cb   : call.error_cb
                };
            }
        }

        success_cb = function(data) { self._batchCb(data, handlers, self.all_done_cb); };

        // No WebSocket, and no HTTP backend?  This won't work.
        if (self.jsonrpcclient.options.ajaxUrl === null) {
            throw "$.JsonRpcClient.batch used with no websocket and no http endpoint.";
        }

        // Send request
        $.ajax({
            url      : self.jsonrpcclient.options.ajaxUrl,
            data     : $.toJSON(batch_request),
            dataType : 'json',
            cache    : false,
            type     : 'POST',

            // Batch-requests should always return 200
            error    : function(jqXHR, textStatus, errorThrown) {
                self.error_cb(jqXHR, textStatus, errorThrown);
            },
            success  : success_cb
        });
    };

    /**
     * Internal helper to match the result array from a batch call to their respective callbacks.
     *
     * @fn _batchCb
     * @memberof $.JsonRpcClient
     */
    $.JsonRpcClient._batchObject.prototype._batchCb = function(result, handlers, all_done_cb) {
        for (var i = 0; i < result.length; i++) {
            var response = result[i];

            // Handle error
            if ('error' in response) {
                if (response.id === null || !(response.id in handlers)) {
                    // An error on a notify?  Just log it to the console.
                    if ('console' in window) console.log(response);
                } else {
                    handlers[response.id].error_cb(response.error, this);
                }
            } else {
                // Here we should always have a correct id and no error.
                if (!(response.id in handlers) && 'console' in window) {
                    console.log(response);
                } else {
                    handlers[response.id].success_cb(response.result, this);
                }
            }
        }

        if (typeof all_done_cb === 'function') all_done_cb(result);
    };

})(jQuery);