/*
   SPDX-FileCopyrightText: 2006, 2011 Boudewijn Rempt (boud@valdyas.org)
   SPDX-FileCopyrightText: 2007, 2009, 2010 Thomas Zander <zander@kde.org>
   SPDX-FileCopyrightText: 2008 Carlos Licea <carlos.licea@kdemail.net>

   SPDX-License-Identifier: LGPL-2.0-or-later
 */
#ifndef KO_CANVASRESOURCEMANAGER_H
#define KO_CANVASRESOURCEMANAGER_H

#include <QObject>

#include "flake_export.h"

class KoShape;
class KoShapeStroke;
class KoColor;
class KoUnit;

class QVariant;
class QSizeF;

/**
 * The KoCanvasResourceManager contains a set of per-canvas
 * properties, like current foreground color, current background
 * color and more. All tools belonging to the current canvas are
 * notified when a Resource changes (is set).
 *
 * The manager can contain all sorts of variable types and there are accessors
 * for the most common ones.  All variables are always stored inside a QVariant
 * instance internally and you can always just use the resource() method to get
 * that directly.
 * The way to store arbitairy data objects that are stored as pointers you can use
 * the following code snippets;
 * @code
 *  QVariant variant;
 *  variant.setValue<void*>(textShapeData->document());
 *  resourceManager->setResource(KoText::CurrentTextDocument, variant);
 *  // and get it out again.
 *  QVariant var = resourceManager->resource(KoText::CurrentTextDocument);
 *  document = static_cast<QTextDocument*>(var.value<void*>());
 * @endcode
 */
class FLAKE_EXPORT KoCanvasResourceManager : public QObject
{
    Q_OBJECT

public:
    /**
     * This enum holds identifiers to the resources that can be stored in here.
     */
    enum CanvasResource {
        ForegroundColor, ///< The active foreground color selected for this canvas.
        BackgroundColor, ///< The active background color selected for this canvas.
        ActiveStroke, ///< The active stroke selected for this canvas
        PageSize, ///< The size of the (current) page in postscript points.
        Unit, ///< The unit of this canvas
        CurrentPage, ///< The current page number
        ActiveStyleType, ///< the actual active style type see KoFlake::StyleType for valid values
        ActiveRange, ///< The area where the rulers should show white
        ShowTextShapeOutlines, ///< Paint of text shape outlines ?
        ShowFormattingCharacters, ///< Paint of formatting characters ?
        ShowTableBorders, ///< Paint of table borders (when not really there) ?
        ShowSectionBounds, ///< Paint of sections bounds ?
        ShowInlineObjectVisualization, ///< paint a different  background for inline objects
        ApplicationSpeciality, ///< Special features and limitations of the application
        KarbonStart = 1000, ///< Base number for Karbon specific values.
        KexiStart = 2000, ///< Base number for Kexi specific values.
        FlowStart = 3000, ///< Base number for Flow specific values.
        PlanStart = 4000, ///< Base number for Plan specific values.
        StageStart = 5000, ///< Base number for Stage specific values.
        SheetsStart = 6000, ///< Base number for Sheets specific values.
        WordsStart = 7000, ///< Base number for Words specific values.
        KoPageAppStart = 8000 ///< Base number for KoPageApp specific values.
    };

    enum ApplicationSpecial {
        NoSpecial = 0,
        NoAdvancedText = 1
    };

    /**
     * Constructor.
     * @param parent the parent QObject, used for memory management.
     */
    explicit KoCanvasResourceManager(QObject *parent = nullptr);
    ~KoCanvasResourceManager() override;

public Q_SLOTS:
    /**
     * Set a resource of any type.
     * @param key the integer key
     * @param value the new value for the key.
     * @see KoCanvasResourceManager::CanvasResource
     */
    void setResource(int key, const QVariant &value);

    /**
     * Set a resource of type KoColor.
     * @param key the integer key
     * @param color the new value for the key.
     * @see KoCanvasResourceManager::CanvasResource
     */
    void setResource(int key, const KoColor &color);

    /**
     * Set a resource of type KoShape*.
     * @param key the integer key
     * @param id the new value for the key.
     * @see KoCanvasResourceManager::CanvasResource
     */
    void setResource(int key, KoShape *shape);

    /**
     * Set a resource of type KoUnit
     * @param key the integer key
     * @param id the new value for the key.
     * @see KoCanvasResourceManager::CanvasResource
     */
    void setResource(int key, const KoUnit &unit);

public:
    /**
     * Returns a qvariant containing the specified resource or a standard one if the
     * specified resource does not exist.
     * @param key the key
     * @see KoCanvasResourceManager::CanvasResource
     */
    QVariant resource(int key) const;

    /**
     * Set the foregroundColor resource.
     * @param color the new foreground color
     */
    void setForegroundColor(const KoColor &color);

    /**
     * Return the foregroundColor
     */
    KoColor foregroundColor() const;

    /**
     * Set the backgroundColor resource.
     * @param color the new background color
     */
    void setBackgroundColor(const KoColor &color);
    /**
     * Return the backgroundColor
     */
    KoColor backgroundColor() const;

    /// Sets the stroke resource
    void setActiveStroke(const KoShapeStroke &stroke);

    /// Returns the stroke resource
    KoShapeStroke activeStroke() const;

    /**
     * Return the resource determined by param key as a boolean.
     * @param key the identifying key for the resource
     * @see KoCanvasResourceManager::CanvasResource
     */
    bool boolResource(int key) const;

    /**
     * Return the resource determined by param key as an integer.
     * @param key the identifying key for the resource
     * @see KoCanvasResourceManager::CanvasResource
     */
    int intResource(int key) const;

    /**
     * Return the resource determined by param key as a KoColor.
     * @param key the identifying key for the resource
     * @see KoCanvasResourceManager::CanvasResource
     */
    KoColor koColorResource(int key) const;

    /**
     * Return the resource determined by param key as a pointer to a KoShape.
     * @param key the identifying key for the resource
     * @see KoCanvasResourceManager::CanvasResource
     */
    KoShape *koShapeResource(int key) const;

    /**
     * Return the resource determined by param key as a QString .
     * @param key the identifying key for the resource
     * @see KoCanvasResourceManager::CanvasResource
     */
    QString stringResource(int key) const;

    /**
     * Return the resource determined by param key as a QSizeF.
     * @param key the identifying key for the resource
     * @see KoCanvasResourceManager::CanvasResource
     */
    QSizeF sizeResource(int key) const;

    /**
     * Return the resource determined by param key as a KoUnit.
     * @param key the identifying key for the resource
     * @see KoCanvasResourceManager::CanvasResource
     */
    KoUnit unitResource(int key) const;

    /**
     * Returns true if there is a resource set with the requested key.
     * @param key the identifying key for the resource
     * @see KoCanvasResourceManager::CanvasResource
     */
    bool hasResource(int key) const;

    /**
     * Remove the resource with @p key from the provider.
     * @param key the key that will be used to remove the resource
     * There will be a signal emitted with a variable that will return true on QVariable::isNull();
     * @see KoCanvasResourceManager::CanvasResource
     */
    void clearResource(int key);

Q_SIGNALS:
    /**
     * This signal is emitted every time a resource is set that is either
     * new or different from the previous set value.
     * @param key the identifying key for the resource
     * @param value the variants new value.
     * @see KoCanvasResourceManager::CanvasResource
     */
    void canvasResourceChanged(int key, const QVariant &value);

private:
    KoCanvasResourceManager(const KoCanvasResourceManager &);
    KoCanvasResourceManager &operator=(const KoCanvasResourceManager &);

    class Private;
    Private *const d;
};

#endif
