/*
 * nheko Copyright (C) 2017  Konstantinos Sideris <siderisk@auth.gr>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <QMainWindow>
#include <QSharedPointer>
#include <QStackedWidget>
#include <QSystemTrayIcon>

class ChatPage;
class LoadingIndicator;
class LoginPage;
class MatrixClient;
class OverlayModal;
class RegisterPage;
class SnackBar;
class TrayIcon;
class UserSettingsPage;
class UserSettings;
class WelcomePage;

class MainWindow : public QMainWindow
{
        Q_OBJECT

public:
        explicit MainWindow(QWidget *parent = 0);
        ~MainWindow();

        static MainWindow *instance();
        void saveCurrentWindowSize();

protected:
        void closeEvent(QCloseEvent *event);
        void keyPressEvent(QKeyEvent *event);

private slots:
        // Handle interaction with the tray icon.
        void iconActivated(QSystemTrayIcon::ActivationReason reason);

        // Show the welcome page in the main window.
        void showWelcomePage();

        // Show the login page in the main window.
        void showLoginPage();

        // Show the register page in the main window.
        void showRegisterPage();
        void showUserSettingsPage();

        // Show the chat page and start communicating with the given access token.
        void showChatPage(QString user_id, QString home_server, QString token);

        void removeOverlayProgressBar();

private:
        bool hasActiveUser();
        void restoreWindowSize();

        static MainWindow *instance_;

        // The initial welcome screen.
        WelcomePage *welcome_page_;

        // The login screen.
        LoginPage *login_page_;

        // The register page.
        RegisterPage *register_page_;

        // A stacked widget that handles the transitions between widgets.
        QStackedWidget *pageStack_;

        // The main chat area.
        ChatPage *chat_page_;
        UserSettingsPage *userSettingsPage_;
        QSharedPointer<UserSettings> userSettings_;

        // Used to hide undefined states between page transitions.
        QSharedPointer<OverlayModal> progressModal_;
        QSharedPointer<LoadingIndicator> spinner_;

        // Matrix Client API provider.
        QSharedPointer<MatrixClient> client_;

        // Tray icon that shows the unread message count.
        TrayIcon *trayIcon_;

        // Notifications display.
        QSharedPointer<SnackBar> snackBar_;
};