/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2012-05-07
 * Description : Item delegate for import interface items.
 *
 * Copyright (C) 2012      by Islam Wazery <wazery at ubuntu dot com>
 * Copyright (C) 2012-2021 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * 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 2, 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.
 *
 * ============================================================ */

#ifndef DIGIKAM_ITEM_VIEW_IMPORT_DELEGATE_H
#define DIGIKAM_ITEM_VIEW_IMPORT_DELEGATE_H

// Local includes

#include "thumbnailsize.h"
#include "ditemdelegate.h"
#include "itemdelegateoverlay.h"

namespace Digikam
{

class ImportCategoryDrawer;
class ImportCategorizedView;
class ImportFilterModel;
class ImportItemModel;
class ItemViewImportDelegatePrivate;

/// NOTE: Some reuse of the existing model-view classes.

class ItemViewImportDelegate : public DItemDelegate, public ItemDelegateOverlayContainer
{
    Q_OBJECT

public:

    explicit ItemViewImportDelegate(QObject* const parent = nullptr);
    ~ItemViewImportDelegate() override;

    ThumbnailSize thumbnailSize() const;
    int           spacing() const;
    QRect         rect() const;

    QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const override;
    QSize gridSize() const override;

    /// reimplemented from DItemDelegate

    void setThumbnailSize(const ThumbnailSize& thumbSize) override;
    void setSpacing(int spacing) override;
    void setDefaultViewOptions(const QStyleOptionViewItem& option) override;
    bool acceptsToolTip(const QPoint& pos, const QRect& visualRect,
                                const QModelIndex& index, QRect* tooltipRect = nullptr) const override;
    bool acceptsActivation(const QPoint& pos, const QRect& visualRect,
                                   const QModelIndex& index, QRect* activationRect = nullptr) const override;

    /**
     * Returns the area where the pixmap is drawn,
     * or null if not supported
     */
    virtual QRect pixmapRect() const;

    /**
     * Returns the area where the image information is drawn,
     * or null if empty / not supported.
     * The image information is textual or graphical information,
     * but not the pixmap. The ratingRect() will e.g. typically
     * be contained in this area.
     */
    virtual QRect imageInformationRect() const;

    /**
     * Can be used to temporarily disable drawing of the rating.
     * Call with QModelIndex() afterwards.
     */
    void setRatingEdited(const QModelIndex& index);

    /**
     * Returns the rectangle where the rating is drawn,
     * or a null rectangle if not supported.
     */
    virtual QRect ratingRect() const;

    void mouseMoved(QMouseEvent* e, const QRect& visualRect, const QModelIndex& index) override;

protected Q_SLOTS:

    void slotThemeChanged();
    void slotSetupChanged();

    void overlayDestroyed(QObject* o) override;

Q_SIGNALS:

    void requestNotification(const QModelIndex& index, const QString& message);
    void hideNotification();

protected:

    /// Use the tool methods for painting in subclasses
    QRect drawThumbnail(QPainter* p, const QRect& thumbRect, const QPixmap& background, const QPixmap& thumbnail) const;
    void drawRating(QPainter* p, const QModelIndex& index, const QRect& ratingRect, int rating, bool isSelected)  const;
    void drawName(QPainter* p,const QRect& nameRect, const QString& name)                                         const;
    void drawCreationDate(QPainter* p, const QRect& dateRect, const QDateTime& date)                              const;
    void drawImageSize(QPainter* p, const QRect& dimsRect, const QSize& dims)                                     const;
    void drawImageFormat(QPainter* p, const QRect& dimsRect, const QString& mime)                                 const;
    void drawFileSize(QPainter* p, const QRect& r, qlonglong bytes)                                               const;
    void drawTags(QPainter* p, const QRect& r, const QString& tagsString, bool isSelected)                        const;
    void drawGroupIndicator(QPainter* p, const QRect& r, int numberOfGroupedImages, bool open)                    const;
    void drawPickLabelIcon(QPainter* p, const QRect& r, int pickLabel)                                            const;
    void drawColorLabelRect(QPainter* p, const QStyleOptionViewItem& option,bool isSelected, int colorId)         const;
    void drawGeolocationIndicator(QPainter* p, const QRect& r)                                                    const;
    void drawDownloadIndicator(QPainter* p, const QRect& r, int itemType)                                         const;
    void drawLockIndicator(QPainter* p, const QRect& r, int lockStatus)                                           const;
    void drawFocusRect(QPainter* p, const QStyleOptionViewItem& option, bool isSelected)                          const;
    void drawMouseOverRect(QPainter* p, const QStyleOptionViewItem& option)                                       const;
    void prepareFonts();
    void prepareMetrics(int maxWidth);
    void prepareBackground();
    void prepareRatingPixmaps(bool composeOverBackground = true);

    /// Returns the relevant pixmap from the cached rating pixmaps
    QPixmap ratingPixmap(int rating, bool selected) const;

    QAbstractItemDelegate* asDelegate() override;

    /// reimplement these in subclasses
    virtual void invalidatePaintingCache();
    virtual void updateSizeRectsAndPixmaps() = 0;

protected:

    ItemViewImportDelegatePrivate* const d_ptr;
    ItemViewImportDelegate(ItemViewImportDelegatePrivate& dd, QObject* const parent);

private:

    // Disable
    ItemViewImportDelegate(const ItemViewImportDelegate&)            = delete;
    ItemViewImportDelegate& operator=(const ItemViewImportDelegate&) = delete;

private:

    Q_DECLARE_PRIVATE(ItemViewImportDelegate)
};

} // namespace Digikam

#endif // DIGIKAM_ITEM_VIEW_IMPORT_DELEGATE_H
