#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QSystemTrayIcon>
#include <QUrl>

QT_BEGIN_NAMESPACE
namespace Ui {
  class MainWindow;
}
QT_END_NAMESPACE

class QAction;
class QCloseEvent;
class QMenu;
class YourlsClient;

/**
 * @brief Main application window used as the settings page.
 *
 * When valid settings exist the application starts in the tray.
 * The tray menu contains the main workflow action, "Cut URL",
 * plus Help, About, Settings and Exit.
 */
class MainWindow : public QMainWindow {
    Q_OBJECT

  public:
    /**
     * @brief Constructs the main window.
     * @param parent Parent widget.
     */
    explicit MainWindow (QWidget *parent = nullptr);

    /**
     * @brief Destroys the main window.
     */
    ~MainWindow() override;

  protected:
    /**
     * @brief Handles close requests.
     * @param event Close event.
     */
    void closeEvent (QCloseEvent *event) override;

  private slots:
    /**
     * @brief Saves settings from the UI.
     */
    void saveSettings();

    /**
     * @brief Shows About text.
     */
    void showAbout();

    /**
     * @brief Shows Help text.
     */
    void showHelp();

    /**
     * @brief Shows the settings window.
     */
    void showSettingsWindow();

    /**
     * @brief Hides the settings window to tray when possible.
     */
    void hideToTray();

    /**
     * @brief Exits the application.
     */
    void exitApplication();

    /**
     * @brief Handles tray icon activation.
     * @param reason Activation reason.
     */
    void onTrayIconActivated (QSystemTrayIcon::ActivationReason reason);

    /**
     * @brief Reads a URL from the clipboard and shortens it.
     */
    void cutUrlFromClipboard();

    /**
     * @brief Handles successful shortening.
     * @param shortUrl Generated short URL.
     */
    void onShortenSucceeded (const QUrl &shortUrl);

    /**
     * @brief Handles shortening failure.
     * @param details Detailed error text.
     */
    void onShortenFailed (const QString &details);

  private:
    /**
     * @brief Creates tray icon and tray menu.
     */
    void setupTray();

    /**
     * @brief Connects UI signals to slots.
     */
    void setupConnections();

    /**
     * @brief Loads persisted settings into the UI.
     */
    void loadSettings();

    /**
     * @brief Returns true when all required settings are present.
     * @return True when the application can work from the tray.
     */
    bool hasValidSettings() const;

    /**
     * @brief Validates and normalizes URL text.
     * @param text Input text.
     * @return Parsed URL.
     */
    QUrl parseClipboardUrl (const QString &text) const;

    /**
     * @brief Shows a popup with the generated short URL.
     * @param shortUrl Generated short URL.
     */
    void showShortUrlPopup (const QUrl &shortUrl);

    /**
     * @brief Creates tray/menu actions.
     */
    void setupMenuActions();

    Ui::MainWindow *ui;
    QSystemTrayIcon *m_trayIcon;
    QMenu *m_trayMenu;
    QAction *m_cutUrlAction;
    QAction *m_settingsAction;
    QAction *m_helpAction;
    QAction *m_aboutAction;
    QAction *m_exitAction;
    YourlsClient *m_yourlsClient;
};

#endif // MAINWINDOW_H