(function () {
    'use strict';

    angular.module('ariaNg').factory('aria2WebSocketRpcService', ['$websocket', 'ariaNgSettingService', function ($websocket, ariaNgSettingService) {
        var rpcUrl = ariaNgSettingService.getJsonRpcUrl();
        var socketClient = null;
        var sendIdMapping = {};

        var getSocketClient = function () {
            if (socketClient == null) {
                socketClient = $websocket(rpcUrl);

                socketClient.onMessage(function (message) {
                    if (!message || !message.data) {
                        return;
                    }

                    var content = angular.fromJson(message.data);

                    if (!content || !content.id) {
                        return;
                    }

                    var uniqueId = content.id;
                    var result = content.result;

                    if (!sendIdMapping[uniqueId]) {
                        return;
                    }

                    var context = sendIdMapping[uniqueId];
                    var callbackMethod = context.callback;

                    if (callbackMethod) {
                        callbackMethod(result);
                    }

                    delete sendIdMapping[uniqueId];
                });
            }

            return socketClient;
        };

        return {
            request: function (context) {
                if (!context) {
                    return;
                }

                var client = getSocketClient();
                var uniqueId = context.uniqueId;
                var requestBody = angular.toJson(context.requestBody);

                sendIdMapping[uniqueId] = context;

                return client.send(requestBody);
            }
        };
    }]);
})();