/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
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**
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
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#ifndef FANCYTABWIDGET_H
#define FANCYTABWIDGET_H

#include "qzcommon.h"

#include <QIcon>
#include <QProxyStyle>
#include <QTabBar>
#include <QTimer>
#include <QWidget>
#include <QPropertyAnimation>

class QActionGroup;
class QMenu;
class QPainter;
class QSignalMapper;
class QStackedLayout;
class QStatusBar;
class QVBoxLayout;

namespace Core
{
namespace Internal
{

class FALKON_EXPORT FancyTabProxyStyle : public QProxyStyle
{
    Q_OBJECT

public:
    void drawControl(ControlElement element, const QStyleOption* option,
                     QPainter* painter, const QWidget* widget) const override;
    void polish(QWidget* widget) override;
    void polish(QApplication* app) override;
    void polish(QPalette &palette) override;

protected:
    bool eventFilter(QObject* o, QEvent* e) override;
};

class FALKON_EXPORT FancyTab : public QWidget
{
    Q_OBJECT

    Q_PROPERTY(float fader READ fader WRITE setFader)
public:
    FancyTab(QWidget* tabbar);
    float fader() { return m_fader; }
    void setFader(float value);

    QSize sizeHint() const override;

    void fadeIn();
    void fadeOut();

    QIcon icon;
    QString text;

protected:
    void enterEvent(QEnterEvent *event) override;
    void leaveEvent(QEvent*) override;

private:
    QPropertyAnimation animator;
    QWidget* tabbar;
    float m_fader;
};

class FALKON_EXPORT FancyTabBar : public QWidget
{
    Q_OBJECT

public:
    explicit FancyTabBar(QWidget* parent = nullptr);
    ~FancyTabBar() override;

    void paintEvent(QPaintEvent* event) override;
    void paintTab(QPainter* painter, int tabIndex) const;
    void mousePressEvent(QMouseEvent*) override;
    bool validIndex(int index) const { return index >= 0 && index < m_tabs.count(); }

    QSize sizeHint() const override;
    QSize minimumSizeHint() const override;

    void addTab(const QIcon &icon, const QString &label);
    void addSpacer(int size = 40);
    void removeTab(int index) {
        FancyTab* tab = m_tabs.takeAt(index);
        delete tab;
    }
    void setCurrentIndex(int index);
    int currentIndex() const { return m_currentIndex; }

    void setTabToolTip(int index, const QString &toolTip);
    QString tabToolTip(int index) const;

    QIcon tabIcon(int index) const {return m_tabs.at(index)->icon; }
    QString tabText(int index) const { return m_tabs.at(index)->text; }
    int count() const {return m_tabs.count(); }
    QRect tabRect(int index) const;

Q_SIGNALS:
    void currentChanged(int);

public Q_SLOTS:
    void emitCurrentIndex();

private:
    static const int m_rounding;
    static const int m_textPadding;
    int m_currentIndex;
    QList<FancyTab*> m_tabs;
    QTimer m_triggerTimer;
    QSize tabSizeHint(bool minimum = false) const;

};

class FALKON_EXPORT FancyTabWidget : public QWidget
{
    Q_OBJECT

    Q_PROPERTY(QPixmap bgPixmap READ bgPixmap WRITE SetBackgroundPixmap)

public:
    explicit FancyTabWidget(QWidget* parent = nullptr);

    // Values are persisted - only add to the end
    enum Mode {
        Mode_None = 0,

        Mode_LargeSidebar = 1,
        Mode_SmallSidebar = 2,
        Mode_Tabs = 3,
        Mode_IconOnlyTabs = 4,
        Mode_PlainSidebar = 5,
    };

    struct Item {
        Item(const QIcon &icon, const QString &label)
            : type_(Type_Tab), tab_label_(label), tab_icon_(icon), spacer_size_(0) {}
        Item(int size) : type_(Type_Spacer), spacer_size_(size) {}

        enum Type {
            Type_Tab,
            Type_Spacer,
        };

        Type type_;
        QString tab_label_;
        QIcon tab_icon_;
        int spacer_size_;
    };

    void AddTab(QWidget* tab, const QIcon &icon, const QString &label);
    void AddSpacer(int size = 40);
    void SetBackgroundPixmap(const QPixmap &pixmap);

    void AddBottomWidget(QWidget* widget);

    int current_index() const;
    Mode mode() const { return mode_; }
    QPixmap bgPixmap() { return background_pixmap_; }

public Q_SLOTS:
    void SetCurrentIndex(int index);
    void SetMode(FancyTabWidget::Mode mode);
    void SetMode(int mode) { SetMode(Mode(mode)); }

Q_SIGNALS:
    void CurrentChanged(int index);
    void ModeChanged(FancyTabWidget::Mode mode);

protected:
    void paintEvent(QPaintEvent* event) override;
    void contextMenuEvent(QContextMenuEvent* e) override;

private Q_SLOTS:
    void ShowWidget(int index);

private:
    void MakeTabBar(QTabBar::Shape shape, bool text, bool icons, bool fancy);
    void AddMenuItem(QSignalMapper* mapper, QActionGroup* group,
                     const QString &text, Mode mode);

    Mode mode_;
    QList<Item> items_;

    QWidget* tab_bar_;
    QStackedLayout* stack_;
    QPixmap background_pixmap_;
    QWidget* side_widget_;
    QVBoxLayout* side_layout_;
    QVBoxLayout* top_layout_;

    bool use_background_;

    QMenu* menu_;

    FancyTabProxyStyle* proxy_style_;
};

} // namespace Internal
} // namespace Core

using Core::Internal::FancyTab;
using Core::Internal::FancyTabBar;
using Core::Internal::FancyTabWidget;

#endif // FANCYTABWIDGET_H
