'use strict';
define(
    [
        'vent',
        'jquery',
        'Shared/Messenger',
        'System/StatusModel',
        'signalR'
    ], function (vent, $, Messenger, StatusModel) {
        return {

            appInitializer: function () {
                console.log('starting signalR');

                var getStatus = function (status) {
                    switch (status) {
                        case    0:
                            return 'connecting';
                        case 1:
                            return 'connected';
                        case 2:
                            return 'reconnecting';
                        case 4:
                            return 'disconnected';
                        default:
                            throw 'invalid status ' + status;
                    }
                };

                var tryingToReconnect = false;
                var messengerId = 'signalR';

                this.signalRconnection = $.connection('/signalr');

                this.signalRconnection.stateChanged(function (change) {
                    console.debug('SignalR: [{0}]'.format(getStatus(change.newState)));
                });

                this.signalRconnection.received(function (message) {
                    vent.trigger('server:' + message.name, message.body);
                });

                this.signalRconnection.reconnecting(function() {
                    if (window.NzbDrone.unloading) {
                        return;
                    }

                    tryingToReconnect = true;
                });

                this.signalRconnection.reconnected(function() {
                    tryingToReconnect = false;

                    var currentVersion = StatusModel.get('version');

                    var promise = StatusModel.fetch();
                    promise.done(function () {
                        if (StatusModel.get('version') !== currentVersion) {
                            vent.trigger(vent.Events.ServerUpdated);
                        }
                    });

                    Messenger.show({
                        id        : messengerId,
                        type      : 'success',
                        hideAfter : 5,
                        message   : 'Connection to backend restored'
                    });
                });

                this.signalRconnection.disconnected(function () {
                    if (tryingToReconnect) {
                        $('<div class="modal-backdrop"></div>').appendTo(document.body);

                        Messenger.show({
                            id        : messengerId,
                            type      : 'error',
                            hideAfter : 0,
                            message   : 'Connection to backend lost',
                            actions   : {
                                cancel: {
                                    label: 'Reload',
                                    action: function() {
                                        window.location.reload();
                                    }
                                }
                            }
                        });
                    }
                });

                this.signalRconnection.start({ transport:
                    [
                        'longPolling'
                    ] });

                return this;
            }
        };
    });