diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23bfdea..5a834fb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,19 +2,35 @@ cmake_minimum_required(VERSION 3.0)
 project(autocat_gnome)
 
 set(CMAKE_CXX_STANDARD 20)
+#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined -g -Og")
 
-#if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-#    add_compile_options(-stdlib=libc++)
-#endif()
-
-find_package(PkgConfig)
+find_package(PkgConfig REQUIRED)
+find_package(nlohmann_json REQUIRED)
+find_package(Boost 1.70 COMPONENTS thread REQUIRED)
 
 pkg_check_modules(GTKMM REQUIRED gtkmm-4.0)
 pkg_check_modules(GLIBMM REQUIRED glibmm-2.68)
 pkg_check_modules(LIBSOUP REQUIRED libsoup-2.4)
+pkg_check_modules(LIBADWAITA REQUIRED libadwaita-1)
 
-include_directories(${GTKMM_INCLUDE_DIRS} ${GLIBMM_INCLUDE_DIRS} ${LIBSOUP_INCLUDE_DIRS})
-link_directories(${GTKMM_LIBRARY_DIRS} ${GLIBMM_LIBRARY_DIRS} ${LIBSOUP_LIBRARY_DIRS})
+include_directories(${GTKMM_INCLUDE_DIRS}
+                    ${GLIBMM_INCLUDE_DIRS}
+                    ${LIBSOUP_INCLUDE_DIRS}
+                    ${Boost_INCLUDE_DIR}
+                    ${LIBADWAITA_INCLUDE_DIRS})
 
-add_executable(autocat_gnome main.cpp gui/MainWindow.cpp gui/MainWindow.h gui/LoginWindow.cpp gui/LoginWindow.h services/Api.cpp services/Api.h coro/Task.h models/User.cpp models/User.h)
-target_link_libraries(autocat_gnome ${GTKMM_LIBRARIES} ${GLIBMM_LIBRARIES} ${LIBSOUP_LIBRARIES})
+link_directories(${GTKMM_LIBRARY_DIRS}
+                ${GLIBMM_LIBRARY_DIRS}
+                ${LIBSOUP_LIBRARY_DIRS}
+                ${Boost_LIBRARY_DIRS}
+                ${LIBADWAITA_LIBRARY_DIRS})
+
+add_definitions(-DBOOST_THREAD_PROVIDES_FUTURE -DBOOST_THREAD_PROVIDES_FUTURE_CONTINUATION -DBOOST_THREAD_PROVIDES_PROMISE_LAZY -DBOOST_THREAD_VERSION=4)
+
+add_executable(autocat_gnome main.cpp gui/MainWindow.cpp gui/MainWindow.h gui/LoginWindow.cpp gui/LoginWindow.h services/Api.cpp services/Api.h coro/Task.h models/User.cpp models/User.h services/Settings.cpp services/Settings.h app/App.cpp app/App.h gui/TitleBar.cpp gui/TitleBar.h)
+target_link_libraries(autocat_gnome ${GTKMM_LIBRARIES}
+                                    ${GLIBMM_LIBRARIES}
+                                    ${LIBSOUP_LIBRARIES}
+                                    nlohmann_json::nlohmann_json
+                                    ${Boost_LIBRARIES}
+                                    ${LIBADWAITA_LIBRARIES})
diff --git a/app/App.cpp b/app/App.cpp
new file mode 100644
index 0000000..f60a34a
--- /dev/null
+++ b/app/App.cpp
@@ -0,0 +1,48 @@
+//
+// Created by selim on 02.02.2022.
+//
+
+#include "App.h"
+#include "../gui/MainWindow.h"
+
+static void activateApp(GtkApplication *gtkApp, void* data) {
+    auto app = reinterpret_cast<App*>(data);
+
+    int i = 0;
+
+    auto win = std::make_shared<MainWindow>();
+    app->setWindow(win);
+
+//    GtkWidget *window = gtk_application_window_new (gtkApp);
+//    GtkWidget *label = gtk_label_new ("Hello World");
+//
+//    gtk_window_set_title (GTK_WINDOW (window), "Hello");
+//    gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
+//    gtk_window_set_child (GTK_WINDOW (window), label);
+//    gtk_window_present (GTK_WINDOW (window));
+}
+
+App::App(): _app(nullptr), _window(nullptr) {
+    _app = adw_application_new("pro.aliencat.aliencat", G_APPLICATION_FLAGS_NONE);
+    g_signal_connect_data(_app, "activate", G_CALLBACK(activateApp), this, nullptr, G_CONNECT_AFTER);
+}
+
+App::~App() {
+    glib_autoptr_cleanup_AdwApplication(&_app);
+}
+
+int App::run(int argc, char **argv) {
+    return g_application_run(G_APPLICATION(_app), argc, argv);
+}
+
+void App::setWindow(std::shared_ptr<Gtk::Window> window) {
+    gtk_application_add_window(GTK_APPLICATION(_app), window->gobj());
+
+    if(_window) {
+        _window->hide();
+        gtk_application_remove_window(GTK_APPLICATION(_app), _window->gobj());
+    }
+
+    window->show();
+    _window = window;
+}
diff --git a/app/App.h b/app/App.h
new file mode 100644
index 0000000..7846f25
--- /dev/null
+++ b/app/App.h
@@ -0,0 +1,25 @@
+//
+// Created by selim on 02.02.2022.
+//
+
+#ifndef AUTOCAT_GNOME_APP_H
+#define AUTOCAT_GNOME_APP_H
+
+#include <gtkmm/window.h>
+#include <adwaita.h>
+#include <memory>
+
+class App {
+private:
+    AdwApplication* _app;
+    std::shared_ptr<Gtk::Window> _window;
+
+public:
+    explicit App();
+    ~App();
+    int run(int argc, char** argv);
+    void setWindow(std::shared_ptr<Gtk::Window> window);
+};
+
+
+#endif //AUTOCAT_GNOME_APP_H
diff --git a/coro/Task.h b/coro/Task.h
index 799a09a..428b127 100644
--- a/coro/Task.h
+++ b/coro/Task.h
@@ -8,94 +8,140 @@
 #include <coroutine>
 #include <iostream>
 #include <optional>
+#include <exception>
+
+#include <boost/thread/future.hpp>
+#include <boost/exception/errinfo_nested_exception.hpp>
+#include <utility>
+#include <glibmm.h>
+
+class FutureException: public virtual std::exception, public virtual boost::exception {
+private:
+    std::string _message;
 
-template<typename T>
-class Task {
 public:
+    explicit FutureException(const char* msg): _message(msg) {}
+    explicit FutureException(std::string msg): _message(std::move(msg)) {}
+
+    const char* what() const noexcept {
+        return _message.c_str();
+    }
+};
+
+// Enable the use of std::future<T> as a coroutine type
+// by using a std::promise<T> as the promise type.
+template <typename T, typename... Args>
+requires(!std::is_void_v<T> && !std::is_reference_v<T>)
+struct std::coroutine_traits<boost::future<T>, Args...> {
+    struct promise_type : boost::promise<T> {
+        boost::future<T> get_return_object() noexcept {
+            return this->get_future();
+        }
+
+        std::suspend_never initial_suspend() const noexcept {
+            return {};
+        }
+        std::suspend_never final_suspend() const noexcept {
+            return {};
+        }
+
+        void return_value(const T &value)
+        noexcept(std::is_nothrow_copy_constructible_v<T>) {
+            this->set_value(value);
+        }
+        void return_value(T &&value)
+        noexcept(std::is_nothrow_move_constructible_v<T>) {
+            this->set_value(std::move(value));
+        }
+        void unhandled_exception() noexcept {
+            this->set_exception(boost::current_exception());
+        }
+    };
+};
+
+// Same for std::future<void>.
+template <typename... Args>
+struct std::coroutine_traits<boost::future<void>, Args...> {
+    struct promise_type : boost::promise<void> {
+        boost::future<void> get_return_object() noexcept {
+            return this->get_future();
+        }
+
+        std::suspend_never initial_suspend() const noexcept {
+            return {};
+        }
+        std::suspend_never final_suspend() const noexcept {
+            return {};
+        }
+
+        void return_void() noexcept {
+            this->set_value();
+        }
+        void unhandled_exception() noexcept {
+            this->set_exception(boost::current_exception());
+        }
+    };
+};
+
+template<typename... Args>
+struct std::coroutine_traits<void, Args...> {
     struct promise_type {
-        auto initial_suspend() const noexcept {
-            std::cout << "initial_suspend" << std::endl;
-            return std::suspend_never();
+        void get_return_object() noexcept {}
+
+        std::suspend_never initial_suspend() const noexcept {
+            return {};
+        }
+        std::suspend_never final_suspend() const noexcept {
+            return {};
         }
 
-        auto final_suspend() const noexcept {
-            std::cout << "final_suspend" << std::endl;
-            return std::suspend_never();
+        void return_void() noexcept {}
+
+        void unhandled_exception() noexcept {
+            try {
+                boost::rethrow_exception(boost::current_exception());
+            } catch (std::exception& ex) {
+                std::cout << "Unhandled exception (in void coroutine) detected: " << ex.what() << std::endl;
+            }
+        }
+    };
+};
+
+template <typename T>
+auto operator co_await(boost::future<T> future) noexcept requires(!std::is_reference_v<T>) {
+
+    struct awaiter : public boost::future<T> {
+
+        bool await_ready() const noexcept {
+            return this->is_ready();
+        }
+        void await_suspend(std::coroutine_handle<> cont) {
+            this->then([this, cont](boost::future<T>&& fut){
+
+                // future was moved out of awaiter to this lambda
+                // so, we need to bring it back
+                this->swap(fut);
+
+                // Resume coroutine on the main thread (i.e. GMainContext)
+                g_idle_add_full(G_PRIORITY_DEFAULT_IDLE, awaiter::resumeContinuation, (gpointer)&cont, nullptr);
+            });
         }
 
-        Task<T> get_return_object() {
-            std::cout << "get_return_object" << std::endl;
-            return Task<T>{ std::coroutine_handle<promise_type>::from_promise(*this) };
+        T await_resume() {
+            return this->get();
         }
 
-        void return_value(const T& value) noexcept(std::is_nothrow_copy_constructible_v<T>) {
-            std::cout << "return_value: " << value << std::endl;
-            _value = value;
-        }
+        static int resumeContinuation(void* data) {
+            auto handler = reinterpret_cast<std::coroutine_handle<>*>(data);
+            if(*handler) {
+                handler->resume();
+            }
 
-//        void return_void() {
-//            std::cout << "return_void" << std::endl;
-//        }
-
-        void unhandled_exception() {
-            std::cout << "unhandled_exception" << std::endl;
-            throw;
+            return G_SOURCE_REMOVE;
         }
     };
 
-private:
-    std::optional<T> _value = std::nullopt;
-    std::coroutine_handle<promise_type> _handle;
-
-//public:
-//    bool await_ready() const noexcept {
-//        std::cout << "Awaiter::await_ready" << std::endl;
-//        return false;
-//    }
-//
-//    void await_suspend(std::coroutine_handle<promise_type> handle) const {
-//        std::cout << "Awaiter::await_suspend" << std::endl;
-//        _handle = handle;
-//    }
-//
-//    T await_resume() {
-//        std::cout << "Awaiter::await_resume" << std::endl;
-//        return _value.value();
-//    }
-
-public:
-    void set_result(T result) {
-        _value = result;
-        _handle();
-    }
-};
-
-template<typename U> struct Awaiter {
-public:
-    bool await_ready() const noexcept {
-        std::cout << "Awaiter::await_ready" << std::endl;
-        return false;
-    }
-
-    void await_suspend(std::coroutine_handle<typename Task<U>::promise_type> cont) const {
-        std::cout << "Awaiter::await_suspend" << std::endl;
-    }
-
-    U await_resume() {
-        std::cout << "Awaiter::await_resume" << std::endl;
-        return _task.value();
-    }
-
-private:
-    Task<U> _task;
-
-public:
-    explicit Awaiter(Task<U> task): _task(task) {}
-};
-
-template<typename T>
-auto operator co_await(Task<T> task) noexcept /*requires(!std::is_reference_v<T>)*/ {
-    return Awaiter<T>(task);
+    return awaiter{std::move(future)};
 }
 
-#endif //AUTOCAT_GNOME_TASK_H
+#endif //AUTOCAT_GNOME_TASK_H
\ No newline at end of file
diff --git a/gui/LoginWindow.cpp b/gui/LoginWindow.cpp
index 6d20787..e7591e6 100644
--- a/gui/LoginWindow.cpp
+++ b/gui/LoginWindow.cpp
@@ -3,8 +3,10 @@
 //
 
 #include "LoginWindow.h"
+#include "MainWindow.h"
 #include "../services/Api.h"
 
+#include <gtkmm/application.h>
 #include <gtkmm/box.h>
 #include <iostream>
 
@@ -17,13 +19,13 @@ LoginWindow::LoginWindow() {
     _passwordField.set_input_purpose(Gtk::InputPurpose::PASSWORD);
     _passwordField.set_visibility(false);
 
-    _emailField.signal_changed().connect(sigc::mem_fun(*this, &LoginWindow::ValidateFields));
-    _passwordField.signal_changed().connect(sigc::mem_fun(*this, &LoginWindow::ValidateFields));
+    _emailField.signal_changed().connect(sigc::mem_fun(*this, &LoginWindow::validateFields));
+    _passwordField.signal_changed().connect(sigc::mem_fun(*this, &LoginWindow::validateFields));
 
     _loginButton.set_margin_top(8);
     _loginButton.set_margin_bottom(8);
     _loginButton.set_label("Log in");
-    _loginButton.signal_clicked().connect(sigc::mem_fun(*this, &LoginWindow::LoginClicked));
+    _loginButton.signal_clicked().connect(sigc::mem_fun(*this, &LoginWindow::loginClicked));
     _loginButton.set_sensitive(false);
 
     Gtk::Box box(Gtk::Orientation::VERTICAL, 8);
@@ -38,32 +40,48 @@ LoginWindow::LoginWindow() {
     set_child(box);
 }
 
-//Task<int> foo() {
-//    co_return 42;
-//}
-//
-//Task<int> bar() {
-//    auto xxx = co_await foo();
-//    std::cout << "xxx: " << xxx << std::endl;
-//}
-
-void LoginWindow::LoginClicked() {
+void LoginWindow::loginClicked() {
     auto email = _emailField.get_text();
     auto password = _passwordField.get_text();
 
-    _loginButton.set_sensitive(false);
-    _emailField.set_sensitive(false);
-    _passwordField.set_sensitive(false);
+    enableControls(false);
     _spinner.start();
 
-    std::cout << "Login clicked" << std::endl;
-    std::cout << "Login: " << email << std::endl;
-    std::cout << "Password: " << password << std::endl;
-
-    User user = co_await Api::login(email, password);
+    try {
+        auto user = co_await Api::login(email, password);
+        auto app = this->get_application();
+        auto mainWindow = new MainWindow();
+        mainWindow->show();
+        hide();
+        app->add_window(*mainWindow);
+        app->remove_window(*this);
+    } catch (std::exception& ex) {
+        enableControls(true);
+        _spinner.stop();
+        showError(ex.what());
+    }
 }
 
-void LoginWindow::ValidateFields() {
+void LoginWindow::validateFields() {
     bool buttonEnabled = _emailField.get_text_length() > 0 && _passwordField.get_text_length() > 0;
     _loginButton.set_sensitive(buttonEnabled);
 }
+
+void LoginWindow::showError(const std::string& message) {
+    _dialog = std::make_unique<Gtk::MessageDialog>("Error",
+                                                   false,
+                                                   Gtk::MessageType::ERROR,
+                                                   Gtk::ButtonsType::OK,
+                                                   true);
+    _dialog->set_secondary_text(message);
+    _dialog->set_transient_for(*this);
+    _dialog->set_hide_on_close(true);
+    _dialog->signal_response().connect(sigc::hide(sigc::mem_fun(*_dialog, &Gtk::Widget::hide)));
+    _dialog->show();
+}
+
+void LoginWindow::enableControls(bool enable) {
+    _loginButton.set_sensitive(enable);
+    _emailField.set_sensitive(enable);
+    _passwordField.set_sensitive(enable);
+}
diff --git a/gui/LoginWindow.h b/gui/LoginWindow.h
index e2b8fd5..e690a3b 100644
--- a/gui/LoginWindow.h
+++ b/gui/LoginWindow.h
@@ -9,6 +9,8 @@
 #include <gtkmm/entry.h>
 #include <gtkmm/button.h>
 #include <gtkmm/spinner.h>
+#include <gtkmm/messagedialog.h>
+#include <memory>
 
 class LoginWindow: public Gtk::Window {
 private:
@@ -16,13 +18,16 @@ private:
     Gtk::Entry _passwordField;
     Gtk::Button _loginButton;
     Gtk::Spinner _spinner;
+    std::unique_ptr<Gtk::MessageDialog> _dialog;
 
 public:
     LoginWindow();
     ~LoginWindow() override = default;
 
-    void LoginClicked();
-    void ValidateFields();
+    void loginClicked();
+    void validateFields();
+    void showError(const std::string& message);
+    void enableControls(bool enable);
 };
 
 
diff --git a/gui/MainWindow.cpp b/gui/MainWindow.cpp
index 40ce501..1f17714 100644
--- a/gui/MainWindow.cpp
+++ b/gui/MainWindow.cpp
@@ -3,8 +3,34 @@
 //
 
 #include "MainWindow.h"
+#include <gdkmm.h>
 
 MainWindow::MainWindow() {
-    set_title("Main window");
+    //set_title("Main window");
     set_default_size(640, 480);
+    //set_decorated(false);
+
+    set_titlebar(_titleBar);
+
+    _masterLabel.set_text("master");
+    _masterBox.set_orientation(Gtk::Orientation::VERTICAL);
+    _masterBox.append(_masterLabel);
+
+    _detailLabel.set_text("detail");
+    _detailBox.set_orientation(Gtk::Orientation::VERTICAL);
+    _detailBox.append(_detailLabel);
+
+    _paned.set_start_child(_masterBox);
+    _paned.set_end_child(_detailBox);
+    _paned.set_resize_start_child(true);
+    _paned.set_shrink_end_child(true);
+    _paned.set_resize_end_child(true);
+    set_child(_paned);
+
+    _sizeGroup = Gtk::SizeGroup::create(Gtk::SizeGroup::Mode::HORIZONTAL);
+    _sizeGroup->add_widget(_titleBar.masterHeader());
+    _sizeGroup->add_widget(_masterBox);
+
+    _titleBar.masterHeader().set_size_request(50, -1);
+    _masterBox.set_size_request(50, -1);
 }
diff --git a/gui/MainWindow.h b/gui/MainWindow.h
index 183db06..c450b71 100644
--- a/gui/MainWindow.h
+++ b/gui/MainWindow.h
@@ -5,9 +5,24 @@
 #ifndef AUTOCAT_GNOME_MAINWINDOW_H
 #define AUTOCAT_GNOME_MAINWINDOW_H
 
+#include "TitleBar.h"
+
 #include <gtkmm/window.h>
+#include <gtkmm/paned.h>
+#include <gtkmm/label.h>
+#include <gtkmm/box.h>
+#include <gtkmm/sizegroup.h>
 
 class MainWindow: public Gtk::Window {
+private:
+    TitleBar _titleBar;
+    Gtk::Paned _paned;
+    Gtk::Label _masterLabel;
+    Gtk::Label _detailLabel;
+    Gtk::Box _masterBox;
+    Gtk::Box _detailBox;
+    Glib::RefPtr<Gtk::SizeGroup> _sizeGroup;
+
 public:
     MainWindow();
 };
diff --git a/gui/TitleBar.cpp b/gui/TitleBar.cpp
new file mode 100644
index 0000000..334e47f
--- /dev/null
+++ b/gui/TitleBar.cpp
@@ -0,0 +1,21 @@
+//
+// Created by selim on 13.02.2022.
+//
+
+#include "TitleBar.h"
+
+TitleBar::TitleBar() {
+    set_start_child(_masterHeader);
+    set_end_child(_detailHeader);
+    set_resize_start_child(true);
+    set_shrink_end_child(true);
+    set_resize_end_child(true);
+}
+
+Gtk::HeaderBar &TitleBar::masterHeader() {
+    return _masterHeader;
+}
+
+Gtk::HeaderBar &TitleBar::detailHeader() {
+    return _detailHeader;
+}
diff --git a/gui/TitleBar.h b/gui/TitleBar.h
new file mode 100644
index 0000000..ce67fd5
--- /dev/null
+++ b/gui/TitleBar.h
@@ -0,0 +1,23 @@
+//
+// Created by selim on 13.02.2022.
+//
+
+#ifndef AUTOCAT_GNOME_TITLEBAR_H
+#define AUTOCAT_GNOME_TITLEBAR_H
+
+#include <gtkmm/paned.h>
+#include <gtkmm/headerbar.h>
+
+class TitleBar: public Gtk::Paned {
+private:
+    Gtk::HeaderBar _masterHeader;
+    Gtk::HeaderBar _detailHeader;
+
+public:
+    TitleBar();
+    Gtk::HeaderBar& masterHeader();
+    Gtk::HeaderBar& detailHeader();
+};
+
+
+#endif //AUTOCAT_GNOME_TITLEBAR_H
diff --git a/main.cpp b/main.cpp
index fad08aa..6e66506 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,8 +1,29 @@
 #include "gui/MainWindow.h"
 #include "gui/LoginWindow.h"
+#include "services/Settings.h"
+#include "app/App.h"
 #include <gtkmm/application.h>
+#include <glibmm.h>
+#include <gtkmm.h>
+#include <memory>
+
+std::unique_ptr<Gtk::Window> createStartWindow() {
+    auto settings = Settings::instance();
+    if(settings.user().token.empty()) {
+        return std::make_unique<LoginWindow>();
+    } else {
+        return std::make_unique<MainWindow>();
+    }
+}
 
 int main(int argc, char* argv[]) {
+
     auto app = Gtk::Application::create("pro.aliencat.aliencat");
-    return app->make_window_and_run<LoginWindow>(argc, argv);
+    auto window = createStartWindow();
+
+    app->signal_activate().connect([&](){
+        app->add_window(*window);
+        window->show();
+    });
+    return app->run(argc, argv);
 }
diff --git a/models/User.cpp b/models/User.cpp
index 3fb4b85..d0f8f1b 100644
--- a/models/User.cpp
+++ b/models/User.cpp
@@ -4,6 +4,6 @@
 
 #include "User.h"
 
-User::User(std::string_view login, std::string_view token): login(login), token(token) {
+User::User(std::string_view email, std::string_view token): email(email), token(token) {
 
 }
diff --git a/models/User.h b/models/User.h
index 31245c1..4b2504e 100644
--- a/models/User.h
+++ b/models/User.h
@@ -7,16 +7,21 @@
 
 #include <string>
 #include <optional>
+#include <nlohmann/json.hpp>
 
 class User {
 public:
-    std::string login;
+    std::string email;
     std::string token;
     std::optional<std::string> googleIdToken;
     std::optional<std::string> googleRefreshToken;
 
 public:
-    User(std::string_view login, std::string_view token);
+    User() = default;
+    User(const User& user) = default;
+    User(std::string_view email, std::string_view token);
+
+    NLOHMANN_DEFINE_TYPE_INTRUSIVE(User, email, token)
 };
 
 
diff --git a/services/Api.cpp b/services/Api.cpp
index 2e5cc94..652dd85 100644
--- a/services/Api.cpp
+++ b/services/Api.cpp
@@ -3,47 +3,76 @@
 //
 
 #include "Api.h"
+#include "Settings.h"
 #include <memory>
 
 template<class...Args>
-struct callback {
+struct Callback {
     void(*function)(Args..., void*) = nullptr;
-    std::unique_ptr<void, void(*)(void*)> state;
+    void* state = nullptr;
 };
 
 template<typename... Args, typename Lambda>
-callback<Args...> voidify(Lambda&& l) {
+Callback<Args...> voidify(Lambda&& l) {
     using Func = typename std::decay<Lambda>::type;
-    std::unique_ptr<void, void(*)(void*)> data(
-            new Func(std::forward<Lambda>(l)),
-            +[](void* ptr){
-                std::cout << "!!!!!!!!!!!!!!!!! Deleting data" << std::endl;
-                delete (Func*)ptr;
-            }
-    );
+    auto data = new Func(std::forward<Lambda>(l));
     return {
             +[](Args... args, void* v)->void {
                 Func* f = static_cast< Func* >(v);
                 (*f)(std::forward<Args>(args)...);
+                delete f;
             },
-            std::move(data)
+            data
     };
 }
 
 const std::string Api::_baseUrl = "https://vps.aliencat.pro:8443/";
 SoupSession* Api::_session = soup_session_new();
 
-Task<User> Api::login(std::string email, std::string password) {
-    std::string url = _baseUrl + "user/login";
+template<typename T>
+boost::future<T> Api::post(const std::string &method, const nlohmann::json& params) {
+    std::string url = _baseUrl + method;
     auto msg = soup_message_new(SOUP_METHOD_POST, url.c_str());
 
-    auto task = Task<User>();
-
-    auto callback = voidify<SoupSession*, SoupMessage*>([&](SoupSession* session, SoupMessage* message) {
-        std::cout << "Callback called" << std::endl;
-        task.set_result(User("qwe", "asdf"));
+    auto promise = std::make_shared<boost::promise<T>>();
+    auto callback = voidify<SoupSession*, SoupMessage*>([&, promise](SoupSession* session, SoupMessage* message) {
+        if(message->status_code >= 200 && message->status_code < 300) {
+            auto responseString = std::string(message->response_body->data, message->response_body->length);
+            auto json = nlohmann::json::parse(responseString);
+            if(json["success"].get<bool>()) {
+                std::cout << "response: " << responseString << std::endl;
+                auto user = json["data"].get<T>();
+                promise->set_value(user);
+            } else {
+                auto error = json["error"].get<std::string>();
+                promise->set_exception(FutureException(error));
+            }
+        } else {
+            promise->set_exception(FutureException(message->reason_phrase));
+        }
     });
-    soup_session_queue_message(_session, msg, callback.function, callback.state.get());
 
-    return task;
+    auto jsonStr = params.dump();
+
+    soup_message_set_request(msg, "application/json", SOUP_MEMORY_COPY, jsonStr.c_str(), jsonStr.size());
+    soup_session_queue_message(_session, msg, callback.function, callback.state);
+
+    return promise->get_future();
+}
+
+boost::future<User> Api::login(std::string email, std::string password) {
+
+    nlohmann::json params = {
+        { "email", email },
+        { "password", password }
+    };
+
+    auto user = Settings::instance().user();
+    auto result = co_await post<User>("user/login", params);
+
+    user.email = result.email;
+    user.token = result.token;
+    Settings::instance().setUser(user);
+
+    co_return user;
 }
diff --git a/services/Api.h b/services/Api.h
index ec17397..4e0befd 100644
--- a/services/Api.h
+++ b/services/Api.h
@@ -7,6 +7,8 @@
 
 #include <string>
 #include <libsoup/soup.h>
+#include <nlohmann/json.hpp>
+
 #include "../models/User.h"
 #include "../coro/Task.h"
 
@@ -15,8 +17,12 @@ private:
     static const std::string _baseUrl;
     static SoupSession* _session;
 
+private:
+    template<typename T>
+    static boost::future<T> post(const std::string& method, const nlohmann::json& params);
+
 public:
-    static Task<User> login(std::string email, std::string password);
+    static boost::future<User> login(std::string email, std::string password);
 };
 
 
diff --git a/services/Settings.cpp b/services/Settings.cpp
new file mode 100644
index 0000000..1a4dd9c
--- /dev/null
+++ b/services/Settings.cpp
@@ -0,0 +1,71 @@
+//
+// Created by selim on 09.01.2022.
+//
+
+#include "Settings.h"
+#include <nlohmann/json.hpp>
+
+#include <cstdlib>
+#include <iostream>
+#include <fstream>
+
+namespace fs = std::filesystem;
+
+fs::path getDataPath() {
+    auto dataDir = std::getenv("XDG_DATA_HOME");
+    if(dataDir) {
+        return fs::path(dataDir);
+    }
+
+    auto home = std::getenv("HOME");
+    if(home) {
+        return fs::path(home) / ".local" / "share";
+    }
+
+    throw std::runtime_error("Failed to find data home directory");
+}
+
+std::string readString(const fs::path& path) {
+    std::ifstream stream(path);
+    stream.seekg(0, std::ios::end);
+    auto size = stream.tellg();
+    std::string buffer(size, ' ');
+    stream.seekg(0);
+    stream.read(&buffer[0], size);
+    return buffer;
+}
+
+void writeString(const fs::path& path, const std::string& text) {
+    std::ofstream stream(path);
+    stream << text;
+}
+
+Settings Settings::instance() {
+    static Settings instance;
+    return instance;
+}
+
+Settings::Settings() {
+    _dataPath = getDataPath() / "autocat";
+    if(!fs::exists(_dataPath)) {
+        fs::create_directories(_dataPath);
+    }
+}
+
+User Settings::user() const {
+    auto userFile = _dataPath / "user.json";
+    if(fs::exists(userFile)) {
+        auto jsonText = readString(userFile);
+        std::cout << "User json text: " << jsonText << std::endl;
+        return nlohmann::json::parse(jsonText).get<User>();
+    } else {
+        return {};
+    }
+}
+
+void Settings::setUser(const User &user) {
+    auto userFile = _dataPath / "user.json";
+    nlohmann::json json = user;
+    auto userString = json.dump(4);
+    writeString(userFile, userString);
+}
diff --git a/services/Settings.h b/services/Settings.h
new file mode 100644
index 0000000..f0f743d
--- /dev/null
+++ b/services/Settings.h
@@ -0,0 +1,24 @@
+//
+// Created by selim on 09.01.2022.
+//
+
+#ifndef AUTOCAT_GNOME_SETTINGS_H
+#define AUTOCAT_GNOME_SETTINGS_H
+
+#include "../models/User.h"
+#include <filesystem>
+
+class Settings {
+private:
+    std::filesystem::path _dataPath;
+
+public:
+    static Settings instance();
+    Settings();
+
+    [[nodiscard]] User user() const;
+    void setUser(const User& user);
+};
+
+
+#endif //AUTOCAT_GNOME_SETTINGS_H