(() => {
                const authUrl = '/login';
                window.fbInit = () => {
                    const initConfig = {
                        appId: 'xxx',
                        cookie: true,
                        xfbml: true,
                        version: 'v2.11'
                    };

                    window.checkLoginState = () => {
                        FB.getLoginStatus(response => {
                            if (response.authResponse) {
                                loginRequest(response.authResponse,() => { FB.getLoginStatus(() => { FB.logout(); }); });
                            }
                        });
                    };

                    window.fbAsyncInit = () => {
                        FB.init(initConfig);
                        FB.AppEvents.logPageView();
                    };

                    (function (d, s, id) {
                        let js, fjs = d.getElementsByTagName(s)[0];
                        if (d.getElementById(id)) return;
                        js = d.createElement(s);
                        js.id = id;
                        js.src = 'https://connect.facebook.net/en_GB/sdk.js#xfbml=1'
                                    + '&version=' + initConfig.version
                                    + '&appId=' + initConfig.appId
                                    + '&autoLogAppEvents=1';
                        fjs.parentNode.insertBefore(js, fjs);
                    }(document, 'script', 'facebook-jssdk'));
                };

                window.googleInit = () => gapi.load('auth2', () => {
                    gapi.auth2.init({client_id: 'xxx'});
                    gapi.signin2.render('g-signin2', {onsuccess: window.onSignIn});
                });

                window.login = isNew => {
                    if (!isNew || $('#newPassword').val() == $('#confirmPassword').val()) {
                        loginRequest({
                            isNew,
                            manual: true,
                            name: $('#name').val(),
                            email: $(isNew ? '#newEmail' : '#email').val(),
                            password: $(isNew ? '#newPassword' : '#password').val()
                        });
                    }
                };

                window.validatePassword = () => {
                    if ($('#newPassword').val() != $('#confirmPassword').val()) {
                        $('#newPassword').addClass('alert-danger');
                        $('#confirmPassword').addClass('alert-danger')
                        $('#signup').attr('disabled', true);
                    } else {
                        $('#newPassword').removeClass('alert-danger');
                        $('#confirmPassword').removeClass('alert-danger')
                        $('#signup').attr('disabled', false);
                    }
                };

                window.logout = () => {
                    $.ajax({
                        url: authUrl,
                        type: 'DELETE',
                        success: () => window.location.pathname = "index.html"
                    });

                };

                window.onSignIn = googleUser => {
                    loginRequest({google_token:googleUser.getAuthResponse().id_token}, gapi.auth2.getAuthInstance().signOut);
                };

                function loginRequest(data, signOut) {
                    $.post({
                        url: authUrl,
                        contentType: 'application/json',
                        data: JSON.stringify(data),
                        success: () => {
                            signOut && signOut();
                            window.location.hash = "";
                            window.location.pathname = "main.html";
                        },
                        error: message => swal("Error", message.responseText, "error")
                  });
                }
            })()