/* Copyright (C) 2014
 * swift Project Community / Contributors
 *
 * This file is part of swift Project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
 * including this file, may be copied, modified, propagated, or distributed except according to the terms
 * contained in the LICENSE file.
 */

//! \file

#ifndef BLACKGUI_DOCKWIDGET_H
#define BLACKGUI_DOCKWIDGET_H

#include "blackguiexport.h"
#include "managedstatusbar.h"
#include "enableforframelesswindow.h"

#include <QDockWidget>
#include <QTabWidget>
#include <QStatusBar>
#include <QMenu>
#include <QLabel>

namespace BlackGui
{

    //! \brief Our base class for dockable widgets containing some specialized functionality on top of QDockWidget.
    //! \details We currently use dockable widgets either as "info area" or "info bar" dockable widget.
    //! Info area widgets reside in an info are and represent a larger piece of information (e.g. all ATC stations, all aircrafts in range).
    //! An info bar is meant to be a small info window displaying information about status, menu state etc.
    //!
    //! \sa CInfoArea
    //! \sa CDockWidgetInfoArea
    //! \sa CDockWidgetInfoBar
    class BLACKGUI_EXPORT CDockWidget :
        public QDockWidget,
        public CEnableForFramelessWindow
    {
        Q_OBJECT

    public:
        //! Set original title bar
        void setOriginalTitleBar();

        //! Set empty title bar (empty widget as title bar)
        void setEmptyTitleBar();

        //! Set null (nullptr) title bar
        void setNullTitleBarWidget();

        //! Margins when window is floating
        void setMarginsWhenFloating(const QMargins &margins);

        //! Margins when window is floating
        void setMarginsWhenFloating(int left, int top, int right, int bottom);

        //! Margins when window is floating (frameless)
        void setMarginsWhenFramelessFloating(const QMargins &margins);

        //! Margins when window is floating (frameless)
        void setMarginsWhenFramelessFloating(int left, int top, int right, int bottom);

        //! Margins when widget is floating
        void setMarginsWhenDocked(const QMargins &margins);

        //! Margins when widget is floating
        void setMarginsWhenDocked(int left, int top, int right, int bottom);

        //! Set margings from .ini file
        bool setMarginsFromSettings(const QString &section = "");

        //! Window title backup
        const QString &windowTitleBackup() const { return this->m_windowTitleBackup; }

        //! If current window title is empty, use backup
        QString windowTitleOrBackup() const;

        //! Window title when window is docked
        bool showTitleWhenDocked() const { return this->m_windowTitleWhenDocked; }

        //! Selected when tabbed
        bool isSelected() const { return this->m_selected; }

        //! Is widget visible? Not to be confused with \sa QWidget::isVisbible
        //! \remarks Logical vsibility as in \sa QDockWidget::visibilityChanged
        bool isWidgetVisible() const;

        //! Allow a status bar to be displayed
        void allowStatusBar(bool allow) { this->m_allowStatusBar = allow; }

        //! Show the window title when docked
        void showTitleWhenDocked(bool show);

        //! Reset first time floating, marked as never floated before
        void resetWasAlreadyFloating();

        //! Was widget already floating?
        bool wasAlreadyFloating() const { return this->m_wasAlreadyFloating; }

        //! Size when floating first time
        void setPreferredSizeWhenFloating(const QSize &size);

        //! Position offset when floating first time
        void setOffsetWhenFloating(const QPoint &point) { this->m_offsetWhenFloating = point; }

        //! \copydoc CEnableForFramelessWindow::setFrameless
        virtual void setFrameless(bool frameless) override;

    public slots:
        //! Toggle floating
        void toggleFloating();

        //! Toggle visibility
        void toggleVisibility();

        //! Toggle frameless mode (EXPERIMENTAL)
        void toggleFrameless();

        //! Set title and internally keep a backup
        void setWindowTitle(const QString &title);

        //! Display status message
        void displayStatusMessage(const BlackMisc::CStatusMessage &statusMessage);

        //! Display status messages
        void displayStatusMessages(const BlackMisc::CStatusMessageList &statusMessages);

    signals:
        //! Top level has changed for given widget
        void widgetTopLevelChanged(CDockWidget *, bool topLevel);

    protected:
        //! Constructor
        explicit CDockWidget(QWidget *parent = nullptr);

        //! Constructor
        CDockWidget(bool allowStatusBar, QWidget *parent = nullptr);

        //! Override close event
        virtual void closeEvent(QCloseEvent *event) override;

        //! \copydoc QWidget::paintEvent
        virtual void paintEvent(QPaintEvent *event) override;

        //! \copydoc QMainWindow::mouseMoveEvent
        virtual void mouseMoveEvent(QMouseEvent *event) override;

        //! \copydoc QMainWindow::mousePressEvent
        virtual void mousePressEvent(QMouseEvent *event) override;

        //! Contribute to menu
        virtual void addToContextMenu(QMenu *contextMenu) const;

        //! Widget is initialized by being a floating window for a shot period.
        //! \details Place where - when overidden - post initializations can take place.
        //! The GUI is already initialized, so all widget data are available.
        virtual void initialFloating();

    protected slots:
        //! Style sheet has changed
        virtual void ps_onStyleSheetsChanged();

    private slots:
        //! Top level has been chaged
        void ps_onTopLevelChanged(bool topLevel);

        //! Context menu
        void ps_showContextMenu(const QPoint &pos);

        //! Visibility has changed
        void ps_onVisibilityChanged(bool visible);

    private:
        QWidget *m_titleBarWidgetEmpty    = nullptr; //!< replacing default title bar
        QWidget *m_titleBarWidgetOriginal = nullptr; //!< the original title bar
        QMargins m_marginsWhenFloating;              //!< Offsets when window is floating
        QMargins m_marginsWhenFramelessFloating;     //!< Offsets when window is frameless floating
        QMargins m_marginsWhenDocked;                //!< Offsets when window is docked
        CManagedStatusBar m_statusBar;               //!< Status bar when floating
        QString  m_windowTitleBackup;                //!< original title, even if the widget title is deleted for layout purposes
        QSize m_preferredSizeWhenFloating;           //!< preferred size when floating 1st time
        QSize m_initialDockedMinimumSize;            //!< minimum size before first floating
        QPoint m_offsetWhenFloating;                 //!< initial offset to main window when floating first time
        bool m_allowStatusBar        = true;
        bool m_windowTitleWhenDocked = true;
        bool m_wasAlreadyFloating    = false;
        bool m_resetedFloating       = false;
        bool m_selected              = false;        //!< selected when tabbed
        bool m_dockWidgetVisible     = false;        //!< logical visible, not to be confused with QDockWidget::isVisible()
        bool m_wasFrameless          = false;        //!< frameless when last floating

        //! Empty widget with no size
        void initTitleBarWidgets();

        //! Init status bar
        void initStatusBar();

        //! Force a style sheet update
        void forceStyleSheetUpdate();
    };

} // namespace

#endif // guard