/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** Alternatively, this file may be used under the terms of the GNU Lesser
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****************************************************************************/

#ifndef QICONLOADER_P_H
#define QICONLOADER_P_H

#include <QtCore/qglobal.h>

#ifndef QT_NO_ICON
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <xdgiconloader_export.h>

#include <QtGui/QIcon>
#include <QtGui/QIconEngine>
#include <QtGui/QPixmapCache>
#include <private/qicon_p.h>
#include <private/qfactoryloader_p.h>
#include <QtCore/QHash>
#include <QtCore/QVector>
#include <QtCore/QTypeInfo>

//QT_BEGIN_NAMESPACE

class XdgIconLoader;

struct XdgIconDirInfo
{
    enum Type { Fixed, Scalable, Threshold };
    XdgIconDirInfo(const QString &_path = QString()) :
            path(_path),
            size(0),
            maxSize(0),
            minSize(0),
            threshold(0),
            type(Threshold) {}
    QString path;
    short size;
    short maxSize;
    short minSize;
    short threshold;
    Type type;
};

class XdgIconLoaderEngineEntry
 {
public:
    virtual ~XdgIconLoaderEngineEntry() {}
    virtual QPixmap pixmap(const QSize &size,
                           QIcon::Mode mode,
                           QIcon::State state) = 0;
    QString filename;
    XdgIconDirInfo dir;
    static int count;
};

struct ScalableEntry : public XdgIconLoaderEngineEntry
{
    QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state) Q_DECL_OVERRIDE;
    QIcon svgIcon;
};

struct PixmapEntry : public XdgIconLoaderEngineEntry
{
    QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state) Q_DECL_OVERRIDE;
    QPixmap basePixmap;
};

typedef QList<XdgIconLoaderEngineEntry*> QThemeIconEntries;

struct QThemeIconInfo
{
    QThemeIconEntries entries;
    QString iconName;
};

//class QIconLoaderEngine : public QIconEngine
class XDGICONLOADER_EXPORT XdgIconLoaderEngine : public QIconEngine
{
public:
    XdgIconLoaderEngine(const QString& iconName = QString());
    ~XdgIconLoaderEngine();

    void paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state);
    QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state);
    QSize actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state);
    QIconEngine *clone() const;
    bool read(QDataStream &in);
    bool write(QDataStream &out) const;

private:
    QString key() const;
    bool hasIcon() const;
    void ensureLoaded();
    void virtual_hook(int id, void *data);
    XdgIconLoaderEngineEntry *entryForSize(const QSize &size);
    XdgIconLoaderEngine(const XdgIconLoaderEngine &other);
    QThemeIconInfo m_info;
    QString m_iconName;
    uint m_key;

    friend class XdgIconLoader;
};

class QIconCacheGtkReader;

class QIconTheme
{
public:
    QIconTheme(const QString &name);
    QIconTheme() : m_valid(false) {}
    QStringList parents() { return m_parents; }
    QVector <XdgIconDirInfo> keyList() { return m_keyList; }
    QStringList contentDirs() { return m_contentDirs; }
    bool isValid() { return m_valid; }
private:
    QStringList m_contentDirs;
    QVector <XdgIconDirInfo> m_keyList;
    QStringList m_parents;
    bool m_valid;
public:
    QVector<QSharedPointer<QIconCacheGtkReader>> m_gtkCaches;
};

class XDGICONLOADER_EXPORT XdgIconLoader
{
public:
    XdgIconLoader();
    QThemeIconInfo loadIcon(const QString &iconName) const;
    uint themeKey() const { return m_themeKey; }

    QString themeName() const { return m_userTheme.isEmpty() ? m_systemTheme : m_userTheme; }
    void setThemeName(const QString &themeName);
    QIconTheme theme() { return themeList.value(themeName()); }
    void setThemeSearchPath(const QStringList &searchPaths);
    QStringList themeSearchPaths() const;
    XdgIconDirInfo dirInfo(int dirindex);
    static XdgIconLoader *instance();
    void updateSystemTheme();
    void invalidateKey() { m_themeKey++; }
    void ensureInitialized();
    bool hasUserTheme() const { return !m_userTheme.isEmpty(); }

private:
    QThemeIconInfo findIconHelper(const QString &themeName,
                                  const QString &iconName,
                                  QStringList &visited) const;
    uint m_themeKey;
    bool m_supportsSvg;
    bool m_initialized;

    mutable QString m_userTheme;
    mutable QString m_systemTheme;
    mutable QStringList m_iconDirs;
    mutable QHash <QString, QIconTheme> themeList;
};


// Note: class template specialization of 'QTypeInfo' must occur at
//       global scope
Q_DECLARE_TYPEINFO(XdgIconDirInfo, Q_MOVABLE_TYPE);

//QT_END_NAMESPACE

#endif // QT_NO_ICON

#endif // QICONLOADER_P_H