/*
 *   Copyright 2008 by Aaron Seigo <aseigo@kde.org>
 *   Copyright 2009 Marco Martin <notmart@gmail.com>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library 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
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#ifndef PLASMA_FRAMESVG_P_H
#define PLASMA_FRAMESVG_P_H

#include <QHash>
#include <QCache>
#include <QStringBuilder>

#include <QDebug>

#include <Plasma/Theme>

namespace Plasma
{

class FrameData
{
public:
    FrameData(FrameSvg *svg, const QString &p)
        : imagePath(svg->imagePath()),
          prefix(p),
          enabledBorders(FrameSvg::AllBorders),
          frameSize(-1, -1),
          topHeight(0),
          leftWidth(0),
          rightWidth(0),
          bottomHeight(0),
          topMargin(0),
          leftMargin(0),
          rightMargin(0),
          bottomMargin(0),
          noBorderPadding(false),
          stretchBorders(false),
          tileCenter(false),
          composeOverBorder(false),
          theme(nullptr)
    {
        ref(svg);
    }

    FrameData(const FrameData &other, FrameSvg *svg)
        : imagePath(other.imagePath),
          prefix(other.prefix),
          enabledBorders(other.enabledBorders),
          cachedMasks(MAX_CACHED_MASKS),
          frameSize(other.frameSize),
          topHeight(0),
          leftWidth(0),
          rightWidth(0),
          bottomHeight(0),
          topMargin(0),
          leftMargin(0),
          rightMargin(0),
          bottomMargin(0),
          devicePixelRatio(svg->devicePixelRatio()),
          noBorderPadding(false),
          stretchBorders(false),
          tileCenter(false),
          composeOverBorder(false),
          theme(nullptr)
    {
        ref(svg);
    }

    ~FrameData();

    void ref(FrameSvg *svg);
    bool deref(FrameSvg *svg);
    bool removeRefs(FrameSvg *svg);
    bool isUsed() const;
    int refcount() const;

    QString imagePath;
    QString prefix;
    QString requestedPrefix;
    FrameSvg::EnabledBorders enabledBorders;
    QPixmap cachedBackground;
    QCache<QString, QRegion> cachedMasks;
    static const int MAX_CACHED_MASKS = 10;

    QSize frameSize;

    //measures
    int topHeight;
    int leftWidth;
    int rightWidth;
    int bottomHeight;

    //margins, are equal to the measures by default
    int topMargin;
    int leftMargin;
    int rightMargin;
    int bottomMargin;

    //measures
    int fixedTopHeight;
    int fixedLeftWidth;
    int fixedRightWidth;
    int fixedBottomHeight;

    //margins, are equal to the measures by default
    int fixedTopMargin;
    int fixedLeftMargin;
    int fixedRightMargin;
    int fixedBottomMargin;

    qreal devicePixelRatio;

    //size of the svg where the size of the "center"
    //element is contentWidth x contentHeight
    bool noBorderPadding : 1;
    bool stretchBorders : 1;
    bool tileCenter : 1;
    bool composeOverBorder : 1;

    QHash<FrameSvg *, int> references;
    Plasma::ThemePrivate *theme;
};

class FrameSvgPrivate
{
public:
    FrameSvgPrivate(FrameSvg *psvg)
        : q(psvg),
          overlayPos(0, 0),
          frame(nullptr),
          maskFrame(nullptr),
          enabledBorders(FrameSvg::AllBorders),
          cacheAll(false),
          repaintBlocked(false)
    {
    }

    ~FrameSvgPrivate();

    QPixmap alphaMask();

    enum UpdateType {
        UpdateFrame,
        UpdateFrameAndMargins
    };

    void generateBackground(FrameData *frame);
    void generateFrameBackground(FrameData *frame);
    QString cacheId(FrameData *frame, const QString &prefixToUse) const;
    void cacheFrame(const QString &prefixToSave, const QPixmap &background, const QPixmap &overlay);
    void updateSizes(FrameData *frame) const;
    void updateNeeded();
    void updateAndSignalSizes();
    QSizeF frameSize(FrameData *frame) const;
    void paintBorder(QPainter& p, FrameData* frame, Plasma::FrameSvg::EnabledBorders border, const QSize& originalSize, const QRect& output) const;
    void paintCorner(QPainter& p, FrameData* frame, Plasma::FrameSvg::EnabledBorders border, const QRect& output) const;
    void paintCenter(QPainter& p, FrameData* frame, const QRect& contentRect, const QSize& fullSize);
    QRect contentGeometry(FrameData* frame, const QSize& size) const;
    void updateFrameData(UpdateType updateType = UpdateFrameAndMargins);
    FrameData *lookupOrCreateMaskFrame(FrameData *frame, const QString &maskPrefix, const QString &maskRequestedPrefix);

    Types::Location location;
    QString prefix;
    //sometimes the prefix we requested is not available, so prefix will be emoty
    //keep track of the requested one anyways, we'll try again when the theme changes
    QString requestedPrefix;

    FrameSvg *q;

    QPoint overlayPos;

    FrameData *frame;
    FrameData *maskFrame;

    //those can differ from frame->enabledBorders if we are in a transition
    FrameSvg::EnabledBorders enabledBorders;
    //this can differ from frame->frameSize if we are in a transition
    QSize pendingFrameSize;

    static QHash<ThemePrivate *, QHash<QString, FrameData *> > s_sharedFrames;

    bool cacheAll : 1;
    bool repaintBlocked : 1;
};

}

#endif
