/*
    SPDX-FileCopyrightText: 2006-2007 Aaron Seigo <aseigo@kde.org>
    SPDX-FileCopyrightText: 2008-2010 Marco Martin <notmart@gmail.com>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#include "svg.h"
#include "private/svg_p.h"
#include "private/theme_p.h"

#include <array>
#include <cmath>

#include <QBuffer>
#include <QCoreApplication>
#include <QDir>
#include <QMatrix>
#include <QPainter>
#include <QRegularExpression>
#include <QStringBuilder>
#include <QXmlStreamReader>
#include <QXmlStreamWriter>

#include <KColorScheme>
#include <KConfigGroup>
#include <KFilterDev>
#include <KIconEffect>
#include <KIconLoader>
#include <KIconTheme>
#include <QDebug>

#include "applet.h"
#include "debug_p.h"
#include "package.h"
#include "theme.h"

uint qHash(const Plasma::SvgPrivate::CacheId &id, uint seed)
{
    std::array<uint, 10> parts = {::qHash(id.width),
                                  ::qHash(id.height),
                                  ::qHash(id.elementName),
                                  ::qHash(id.filePath),
                                  ::qHash(id.status),
                                  ::qHash(id.devicePixelRatio),
                                  ::qHash(id.scaleFactor),
                                  ::qHash(id.colorGroup),
                                  ::qHash(id.extraFlags),
                                  ::qHash(id.lastModified)};
    return qHashRange(parts.begin(), parts.end(), seed);
}

namespace Plasma
{
class SvgRectsCacheSingleton
{
public:
    SvgRectsCache self;
};

Q_GLOBAL_STATIC(SvgRectsCacheSingleton, privateSvgRectsCacheSelf)

const uint SvgRectsCache::s_seed = 0x9e3779b9;

SharedSvgRenderer::SharedSvgRenderer(QObject *parent)
    : QSvgRenderer(parent)
{
}

SharedSvgRenderer::SharedSvgRenderer(const QString &filename, const QString &styleSheet, QHash<QString, QRectF> &interestingElements, QObject *parent)
    : QSvgRenderer(parent)
{
    KCompressionDevice file(filename, KCompressionDevice::GZip);
    if (!file.open(QIODevice::ReadOnly)) {
        return;
    }
    load(file.readAll(), styleSheet, interestingElements);
}

SharedSvgRenderer::SharedSvgRenderer(const QByteArray &contents, const QString &styleSheet, QHash<QString, QRectF> &interestingElements, QObject *parent)
    : QSvgRenderer(parent)
{
    load(contents, styleSheet, interestingElements);
}

bool SharedSvgRenderer::load(const QByteArray &contents, const QString &styleSheet, QHash<QString, QRectF> &interestingElements)
{
    // Apply the style sheet.
    if (!styleSheet.isEmpty() && contents.contains("current-color-scheme")) {
        QByteArray processedContents;
        processedContents.reserve(contents.size());
        QXmlStreamReader reader(contents);

        QBuffer buffer(&processedContents);
        buffer.open(QIODevice::WriteOnly);
        QXmlStreamWriter writer(&buffer);
        while (!reader.atEnd()) {
            if (reader.readNext() == QXmlStreamReader::StartElement && reader.qualifiedName() == QLatin1String("style")
                && reader.attributes().value(QLatin1String("id")) == QLatin1String("current-color-scheme")) {
                writer.writeStartElement(QLatin1String("style"));
                writer.writeAttributes(reader.attributes());
                writer.writeCharacters(styleSheet);
                writer.writeEndElement();
                while (reader.tokenType() != QXmlStreamReader::EndElement) {
                    reader.readNext();
                }
            } else if (reader.tokenType() != QXmlStreamReader::Invalid) {
                writer.writeCurrentToken(reader);
            }
        }
        buffer.close();
        if (!QSvgRenderer::load(processedContents)) {
            return false;
        }
    } else if (!QSvgRenderer::load(contents)) {
        return false;
    }

    // Search the SVG to find and store all ids that contain size hints.
    const QString contentsAsString(QString::fromLatin1(contents));
    static const QRegularExpression idExpr(QLatin1String("id\\s*?=\\s*?(['\"])(\\d+?-\\d+?-.*?)\\1"));
    Q_ASSERT(idExpr.isValid());

    auto matchIt = idExpr.globalMatch(contentsAsString);
    while (matchIt.hasNext()) {
        auto match = matchIt.next();
        QString elementId = match.captured(2);

        QRectF elementRect = boundsOnElement(elementId);
        if (elementRect.isValid()) {
            interestingElements.insert(elementId, elementRect);
        }
    }

    return true;
}

SvgRectsCache::SvgRectsCache(QObject *parent)
    : QObject(parent)
{
    const QString svgElementsFile =
        QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QLatin1Char('/') + QStringLiteral("plasma-svgelements");
    m_svgElementsCache = KSharedConfig::openConfig(svgElementsFile, KConfig::SimpleConfig);

    m_configSyncTimer = new QTimer(this);
    m_configSyncTimer->setSingleShot(true);
    m_configSyncTimer->setInterval(5000);
    connect(m_configSyncTimer, &QTimer::timeout, this, [this]() {
        m_svgElementsCache->sync();
    });
}

SvgRectsCache *SvgRectsCache::instance()
{
    return &privateSvgRectsCacheSelf()->self;
}

void SvgRectsCache::insert(Plasma::SvgPrivate::CacheId cacheId, const QRectF &rect, unsigned int lastModified)
{
    insert(qHash(cacheId, SvgRectsCache::s_seed), cacheId.filePath, rect, lastModified);
}

void SvgRectsCache::insert(uint id, const QString &filePath, const QRectF &rect, unsigned int lastModified)
{
    if (m_localRectCache.contains(id)) {
        return;
    }

    m_localRectCache.insert(id, rect);

    KConfigGroup imageGroup(m_svgElementsCache, filePath);
    imageGroup.writeEntry("LastModified", lastModified);
    if (rect.isValid()) {
        imageGroup.writeEntry(QString::number(id), rect);
    } else {
        m_invalidElements[filePath] << id;
        imageGroup.writeEntry("Invalidelements", m_invalidElements[filePath].values());
    }
    QMetaObject::invokeMethod(m_configSyncTimer, QOverload<>::of(&QTimer::start));
}

bool SvgRectsCache::findElementRect(Plasma::SvgPrivate::CacheId cacheId, QRectF &rect)
{
    return findElementRect(qHash(cacheId, SvgRectsCache::s_seed), cacheId.filePath, rect);
}

bool SvgRectsCache::findElementRect(uint id, const QString &filePath, QRectF &rect)
{
    auto it = m_localRectCache.find(id);

    if (it == m_localRectCache.end()) {
        if (m_invalidElements.contains(filePath) && m_invalidElements[filePath].contains(id)) {
            rect = QRectF();
            return true;
        }
        return false;
    }

    rect = *it;

    return true;
}

void SvgRectsCache::loadImageFromCache(const QString &path, uint lastModified)
{
    if (path.isEmpty()) {
        return;
    }

    KConfigGroup imageGroup(m_svgElementsCache, path);

    unsigned int savedTime = imageGroup.readEntry("LastModified", 0);

    if (lastModified > savedTime) {
        imageGroup.deleteGroup();
        QMetaObject::invokeMethod(m_configSyncTimer, QOverload<>::of(&QTimer::start));
        return;
    }

    auto list = imageGroup.readEntry("Invalidelements", QList<unsigned int>());
    m_invalidElements[path] = QSet<unsigned int>(list.begin(), list.end());

    for (const auto &key : imageGroup.keyList()) {
        bool ok = false;
        uint keyUInt = key.toUInt(&ok);
        if (ok) {
            const QRectF rect = imageGroup.readEntry(key, QRectF());
            m_localRectCache.insert(keyUInt, rect);
        }
    }
}

void SvgRectsCache::dropImageFromCache(const QString &path)
{
    KConfigGroup imageGroup(m_svgElementsCache, path);
    imageGroup.deleteGroup();
    QMetaObject::invokeMethod(m_configSyncTimer, QOverload<>::of(&QTimer::start));
}

QList<QSize> SvgRectsCache::sizeHintsForId(const QString &path, const QString &id)
{
    const QString pathId = path % id;

    if (!m_sizeHintsForId.contains(pathId)) {
        KConfigGroup imageGroup(m_svgElementsCache, path);
        const QStringList &encoded = imageGroup.readEntry(id, QStringList());
        QList<QSize> sizes;
        for (const auto &token : encoded) {
            const auto &parts = token.split(QLatin1Char('x'));
            if (parts.size() != 2) {
                continue;
            }
            QSize size = QSize(parts[0].toDouble(), parts[1].toDouble());
            if (!size.isEmpty()) {
                sizes << size;
            }
        }
        m_sizeHintsForId[pathId] = sizes;
        return sizes;
    }

    return m_sizeHintsForId.value(pathId);
}

void SvgRectsCache::insertSizeHintForId(const QString &path, const QString &id, const QSize &size)
{
    // TODO: need to make this more efficient
    auto sizeListToString = [](const QList<QSize> &list) {
        QString ret;
        for (const auto &s : list) {
            ret += QString::number(s.width()) % QLatin1Char('x') % QString::number(s.height()) % QLatin1Char(',');
        }
        return ret;
    };
    m_sizeHintsForId[path % id].append(size);
    KConfigGroup imageGroup(m_svgElementsCache, path);
    imageGroup.writeEntry(id, sizeListToString(m_sizeHintsForId[path % id]));
    QMetaObject::invokeMethod(m_configSyncTimer, QOverload<>::of(&QTimer::start));
}

QString SvgRectsCache::iconThemePath()
{
    if (!m_iconThemePath.isEmpty()) {
        return m_iconThemePath;
    }

    KConfigGroup imageGroup(m_svgElementsCache, QStringLiteral("General"));
    m_iconThemePath = imageGroup.readEntry(QStringLiteral("IconThemePath"), QString());

    return m_iconThemePath;
}

void SvgRectsCache::setIconThemePath(const QString &path)
{
    m_iconThemePath = path;
    KConfigGroup imageGroup(m_svgElementsCache, QStringLiteral("General"));
    imageGroup.writeEntry(QStringLiteral("IconThemePath"), path);
    QMetaObject::invokeMethod(m_configSyncTimer, QOverload<>::of(&QTimer::start));
}

void SvgRectsCache::expireCache(const QString &path)
{
    KConfigGroup imageGroup(m_svgElementsCache, path);

    unsigned int savedTime = imageGroup.readEntry("LastModified", QDateTime().toSecsSinceEpoch());
    QFileInfo info(path);
    if (info.exists()) {
        unsigned int lastModified = info.lastModified().toSecsSinceEpoch();
        if (lastModified <= savedTime) {
            return;
        }
    }

    imageGroup.deleteGroup();
}

void SvgRectsCache::setNaturalSize(const QString &path, qreal scaleFactor, const QSizeF &size)
{
    KConfigGroup imageGroup(m_svgElementsCache, path);

    // FIXME: needs something faster, perhaps even sprintf
    imageGroup.writeEntry(QStringLiteral("NaturalSize_") % QString::number(scaleFactor), size);
    QMetaObject::invokeMethod(m_configSyncTimer, QOverload<>::of(&QTimer::start));
}

QSizeF SvgRectsCache::naturalSize(const QString &path, qreal scaleFactor)
{
    KConfigGroup imageGroup(m_svgElementsCache, path);

    // FIXME: needs something faster, perhaps even sprintf
    return imageGroup.readEntry(QStringLiteral("NaturalSize_") % QString::number(scaleFactor), QSizeF());
}

QStringList SvgRectsCache::cachedKeysForPath(const QString &path) const
{
    KConfigGroup imageGroup(m_svgElementsCache, path);
    QStringList list = imageGroup.keyList();
    QStringList filtered;

    std::copy_if(list.begin(), list.end(), std::back_inserter(filtered), [](const QString element) {
        bool ok;
        element.toLong(&ok);
        return ok;
    });
    return filtered;
}

void SvgRectsCache::updateLastModified(const QString &filePath, unsigned int lastModified)
{
    KConfigGroup imageGroup(m_svgElementsCache, filePath);
    imageGroup.writeEntry("LastModified", lastModified);
    QMetaObject::invokeMethod(m_configSyncTimer, QOverload<>::of(&QTimer::start));
}

SvgPrivate::SvgPrivate(Svg *svg)
    : q(svg)
    , renderer(nullptr)
    , styleCrc(0)
    , colorGroup(Plasma::Theme::NormalColorGroup)
    , lastModified(0)
    , devicePixelRatio(1.0)
    , scaleFactor(s_lastScaleFactor)
    , status(Svg::Status::Normal)
    , multipleImages(false)
    , themed(false)
    , useSystemColors(false)
    , fromCurrentTheme(false)
    , applyColors(false)
    , usesColors(false)
    , cacheRendering(true)
    , themeFailed(false)
{
}

SvgPrivate::~SvgPrivate()
{
    eraseRenderer();
}

// This function is meant for the rects cache
SvgPrivate::CacheId SvgPrivate::cacheId(const QString &elementId) const
{
    auto idSize = size.isValid() && size != naturalSize ? size : QSizeF{-1.0, -1.0};
    return CacheId{idSize.width(), idSize.height(), path, elementId, status, devicePixelRatio, scaleFactor, -1, 0, lastModified};
}

// This function is meant for the pixmap cache
QString SvgPrivate::cachePath(const QString &id, const QSize &size) const
{
    auto cacheId = CacheId{double(size.width()), double(size.height()), path, id, status, devicePixelRatio, scaleFactor, colorGroup, 0, lastModified};
    return QString::number(qHash(cacheId, SvgRectsCache::s_seed));
}

bool SvgPrivate::setImagePath(const QString &imagePath)
{
    QString actualPath = imagePath;
    if (imagePath.startsWith(QLatin1String("file://"))) {
        // length of file://
        actualPath.remove(0, 7);
    }

    bool isThemed = !actualPath.isEmpty() && !QDir::isAbsolutePath(actualPath);
    bool inIconTheme = false;

    // an absolute path.. let's try if this actually an *icon* theme
    if (!isThemed && !actualPath.isEmpty()) {
        const auto *iconTheme = KIconLoader::global()->theme();
        isThemed = inIconTheme = iconTheme && actualPath.startsWith(iconTheme->dir());
    }
    // lets check to see if we're already set to this file
    if (isThemed == themed && ((themed && themePath == actualPath) || (!themed && path == actualPath))) {
        return false;
    }

    eraseRenderer();

    // if we don't have any path right now and are going to set one,
    // then lets not schedule a repaint because we are just initializing!
    bool updateNeeded = true; //! path.isEmpty() || !themePath.isEmpty();

    QObject::disconnect(actualTheme(), SIGNAL(themeChanged()), q, SLOT(themeChanged()));
    if (isThemed && !themed && s_systemColorsCache) {
        // catch the case where we weren't themed, but now we are, and the colors cache was set up
        // ensure we are not connected to that theme previously
        QObject::disconnect(s_systemColorsCache.data(), nullptr, q, nullptr);
    }

    themed = isThemed;
    path.clear();
    themePath.clear();

    bool oldFromCurrentTheme = fromCurrentTheme;
    fromCurrentTheme = !inIconTheme && isThemed && actualTheme()->currentThemeHasImage(imagePath);

    if (fromCurrentTheme != oldFromCurrentTheme) {
        Q_EMIT q->fromCurrentThemeChanged(fromCurrentTheme);
    }

    if (inIconTheme) {
        themePath = actualPath;
        path = actualPath;
        QObject::connect(actualTheme(), SIGNAL(themeChanged()), q, SLOT(themeChanged()));
    } else if (themed) {
        themePath = actualPath;
        path = actualTheme()->imagePath(themePath);
        themeFailed = path.isEmpty();
        QObject::connect(actualTheme(), SIGNAL(themeChanged()), q, SLOT(themeChanged()));
    } else if (QFileInfo::exists(actualPath)) {
        QObject::connect(cacheAndColorsTheme(), SIGNAL(themeChanged()), q, SLOT(themeChanged()), Qt::UniqueConnection);
        path = actualPath;
    } else {
#ifndef NDEBUG
        // qCDebug(LOG_PLASMA) << "file '" << path << "' does not exist!";
#endif
    }

    QFileInfo info(path);

    lastModified = info.lastModified().toSecsSinceEpoch();

    SvgRectsCache::instance()->loadImageFromCache(path, lastModified);

    // check if svg wants colorscheme applied
    checkColorHints();

    // also images with absolute path needs to have a natural size initialized,
    // even if looks a bit weird using Theme to store non-themed stuff
    if ((themed && !path.isEmpty() && QFileInfo::exists(path)) || QFileInfo::exists(actualPath)) {
        QRectF rect;

        naturalSize = SvgRectsCache::instance()->naturalSize(path, scaleFactor);
        if (naturalSize.isEmpty()) {
            createRenderer();
            naturalSize = renderer->defaultSize() * scaleFactor;
            SvgRectsCache::instance()->setNaturalSize(path, scaleFactor, naturalSize);
        }
    }

    q->resize();
    Q_EMIT q->imagePathChanged();

    return updateNeeded;
}

Theme *SvgPrivate::actualTheme()
{
    if (!theme) {
        theme = new Plasma::Theme(q);
    }

    return theme.data();
}

Theme *SvgPrivate::cacheAndColorsTheme()
{
    if (themed || !useSystemColors) {
        return actualTheme();
    } else {
        // use a separate cache source for unthemed svg's
        if (!s_systemColorsCache) {
            // FIXME: reference count this, so that it is deleted when no longer in use
            s_systemColorsCache = new Plasma::Theme(QStringLiteral("internal-system-colors"));
        }

        return s_systemColorsCache.data();
    }
}

QPixmap SvgPrivate::findInCache(const QString &elementId, qreal ratio, const QSizeF &s)
{
    QSize size;
    QString actualElementId;

    // Look at the size hinted elements and try to find the smallest one with an
    // identical aspect ratio.
    if (s.isValid() && !elementId.isEmpty()) {
        const QList<QSize> elementSizeHints = SvgRectsCache::instance()->sizeHintsForId(path, elementId);

        if (!elementSizeHints.isEmpty()) {
            QSizeF bestFit(-1, -1);

            for (const auto &hint : elementSizeHints) {
                if (hint.width() >= s.width() * ratio && hint.height() >= s.height() * ratio
                    && (!bestFit.isValid() || (bestFit.width() * bestFit.height()) > (hint.width() * hint.height()))) {
                    bestFit = hint;
                }
            }

            if (bestFit.isValid()) {
                actualElementId = QString::number(bestFit.width()) % QLatin1Char('-') % QString::number(bestFit.height()) % QLatin1Char('-') % elementId;
            }
        }
    }

    if (elementId.isEmpty() || !q->hasElement(actualElementId)) {
        actualElementId = elementId;
    }

    if (elementId.isEmpty() || (multipleImages && s.isValid())) {
        size = s.toSize() * ratio;
    } else {
        size = elementRect(actualElementId).size().toSize() * ratio;
    }

    if (size.isEmpty()) {
        return QPixmap();
    }

    const QString id = cachePath(actualElementId, size);

    QPixmap p;
    if (cacheRendering && cacheAndColorsTheme()->findInCache(id, p, lastModified)) {
        p.setDevicePixelRatio(ratio);
        // qCDebug(LOG_PLASMA) << "found cached version of " << id << p.size();
        return p;
    }

    createRenderer();

    QRectF finalRect = makeUniform(renderer->boundsOnElement(actualElementId), QRect(QPoint(0, 0), size));

    // don't alter the pixmap size or it won't match up properly to, e.g., FrameSvg elements
    // makeUniform should never change the size so much that it gains or loses a whole pixel
    p = QPixmap(size);

    p.fill(Qt::transparent);
    QPainter renderPainter(&p);

    if (actualElementId.isEmpty()) {
        renderer->render(&renderPainter, finalRect);
    } else {
        renderer->render(&renderPainter, actualElementId, finalRect);
    }

    renderPainter.end();
    p.setDevicePixelRatio(ratio);

    // Apply current color scheme if the svg asks for it
    if (applyColors) {
        QImage itmp = p.toImage();
        KIconEffect::colorize(itmp, cacheAndColorsTheme()->color(Theme::BackgroundColor), 1.0);
        p = p.fromImage(itmp);
    }

    if (cacheRendering) {
        cacheAndColorsTheme()->insertIntoCache(id, p, QString::number((qint64)q, 16) % QLatin1Char('_') % actualElementId);
    }

    SvgRectsCache::instance()->updateLastModified(path, lastModified);

    return p;
}

void SvgPrivate::createRenderer()
{
    if (renderer) {
        return;
    }

    if (themed && path.isEmpty() && !themeFailed) {
        Applet *applet = qobject_cast<Applet *>(q->parent());
        // FIXME: this maybe could be more efficient if we knew if the package was empty, e.g. for
        // C++; however, I'm not sure this has any real world runtime impact. something to measure
        // for.
        if (applet && applet->kPackage().isValid()) {
            const KPackage::Package package = applet->kPackage();
            path = package.filePath("images", themePath + QLatin1String(".svg"));

            if (path.isEmpty()) {
                path = package.filePath("images", themePath + QLatin1String(".svgz"));
            }
        }

        if (path.isEmpty()) {
            path = actualTheme()->imagePath(themePath);
            themeFailed = path.isEmpty();
            if (themeFailed) {
                qCWarning(LOG_PLASMA) << "No image path found for" << themePath;
            }
        }
    }

    QString styleSheet = cacheAndColorsTheme()->d->svgStyleSheet(colorGroup, status);
    styleCrc = qChecksum(styleSheet.toUtf8().constData(), styleSheet.size());

    QHash<QString, SharedSvgRenderer::Ptr>::const_iterator it = s_renderers.constFind(styleCrc + path);

    if (it != s_renderers.constEnd()) {
        renderer = it.value();
    } else {
        if (path.isEmpty()) {
            renderer = new SharedSvgRenderer();
        } else {
            QHash<QString, QRectF> interestingElements;
            renderer = new SharedSvgRenderer(path, styleSheet, interestingElements);

            // Add interesting elements to the theme's rect cache.
            QHashIterator<QString, QRectF> i(interestingElements);

            QRegularExpression sizeHintedKeyExpr(QStringLiteral("^(\\d+)-(\\d+)-(.+)$"));

            while (i.hasNext()) {
                i.next();
                const QString &elementId = i.key();
                QString originalId = i.key();
                const QRectF &elementRect = i.value();

                originalId.replace(sizeHintedKeyExpr, QStringLiteral("\\3"));
                SvgRectsCache::instance()->insertSizeHintForId(path, originalId, elementRect.size().toSize());

                const CacheId cacheId({-1.0, -1.0, path, elementId, status, devicePixelRatio, scaleFactor, -1, 0, lastModified});
                SvgRectsCache::instance()->insert(cacheId, elementRect, lastModified);
            }
        }

        s_renderers[styleCrc + path] = renderer;
    }

    if (size == QSizeF()) {
        size = renderer->defaultSize();
    }
}

void SvgPrivate::eraseRenderer()
{
    if (renderer && renderer->ref.loadRelaxed() == 2) {
        // this and the cache reference it
        s_renderers.erase(s_renderers.find(styleCrc + path));
    }

    renderer = nullptr;
    styleCrc = 0;
}

QRectF SvgPrivate::elementRect(const QString &elementId)
{
    if (themed && path.isEmpty()) {
        if (themeFailed) {
            return QRectF();
        }

        path = actualTheme()->imagePath(themePath);
        themeFailed = path.isEmpty();

        if (themeFailed) {
            return QRectF();
        }
    }

    if (path.isEmpty()) {
        return QRectF();
    }

    QRectF rect;
    const CacheId cacheId = SvgPrivate::cacheId(elementId);
    bool found = SvgRectsCache::instance()->findElementRect(cacheId, rect);
    // This is a corner case where we are *sure* the element is not valid
    if (!found) {
        rect = findAndCacheElementRect(elementId);
    }

    return rect;
}

QRectF SvgPrivate::findAndCacheElementRect(const QString &elementId)
{
    // we need to check the id before createRenderer(), otherwise it may generate a different id compared to the previous cacheId)( call
    const CacheId cacheId = SvgPrivate::cacheId(elementId);

    createRenderer();

    // This code will usually never be run because createRenderer already caches all the boundingRect in the elements in the svg
    QRectF elementRect =
        renderer->elementExists(elementId) ? renderer->transformForElement(elementId).map(renderer->boundsOnElement(elementId)).boundingRect() : QRectF();
    naturalSize = renderer->defaultSize() * scaleFactor;

    qreal dx = size.width() / renderer->defaultSize().width();
    qreal dy = size.height() / renderer->defaultSize().height();

    elementRect = QRectF(elementRect.x() * dx, elementRect.y() * dy, elementRect.width() * dx, elementRect.height() * dy);
    SvgRectsCache::instance()->insert(cacheId, elementRect, lastModified);

    return elementRect;
}

void SvgPrivate::checkColorHints()
{
    if (elementRect(QStringLiteral("hint-apply-color-scheme")).isValid()) {
        applyColors = true;
        usesColors = true;
    } else if (elementRect(QStringLiteral("current-color-scheme")).isValid()) {
        applyColors = false;
        usesColors = true;
    } else {
        applyColors = false;
        usesColors = false;
    }

    // check to see if we are using colors, but the theme isn't being used or isn't providing
    // a colorscheme
    if (qGuiApp) {
        if (usesColors && (!themed || !actualTheme()->colorScheme())) {
            QObject::connect(actualTheme()->d, SIGNAL(applicationPaletteChange()), q, SLOT(colorsChanged()));
        } else {
            QObject::disconnect(actualTheme()->d, SIGNAL(applicationPaletteChange()), q, SLOT(colorsChanged()));
        }
    }
}

bool Svg::eventFilter(QObject *watched, QEvent *event)
{
    return QObject::eventFilter(watched, event);
}

// Following two are utility functions to snap rendered elements to the pixel grid
// to and from are always 0 <= val <= 1
qreal SvgPrivate::closestDistance(qreal to, qreal from)
{
    qreal a = to - from;
    if (qFuzzyCompare(to, from)) {
        return 0;
    } else if (to > from) {
        qreal b = to - from - 1;
        return (qAbs(a) > qAbs(b)) ? b : a;
    } else {
        qreal b = 1 + to - from;
        return (qAbs(a) > qAbs(b)) ? b : a;
    }
}

QRectF SvgPrivate::makeUniform(const QRectF &orig, const QRectF &dst)
{
    if (qFuzzyIsNull(orig.x()) || qFuzzyIsNull(orig.y())) {
        return dst;
    }

    QRectF res(dst);
    qreal div_w = dst.width() / orig.width();
    qreal div_h = dst.height() / orig.height();

    qreal div_x = dst.x() / orig.x();
    qreal div_y = dst.y() / orig.y();

    // horizontal snap
    if (!qFuzzyIsNull(div_x) && !qFuzzyCompare(div_w, div_x)) {
        qreal rem_orig = orig.x() - (floor(orig.x()));
        qreal rem_dst = dst.x() - (floor(dst.x()));
        qreal offset = closestDistance(rem_dst, rem_orig);
        res.translate(offset + offset * div_w, 0);
        res.setWidth(res.width() + offset);
    }
    // vertical snap
    if (!qFuzzyIsNull(div_y) && !qFuzzyCompare(div_h, div_y)) {
        qreal rem_orig = orig.y() - (floor(orig.y()));
        qreal rem_dst = dst.y() - (floor(dst.y()));
        qreal offset = closestDistance(rem_dst, rem_orig);
        res.translate(0, offset + offset * div_h);
        res.setHeight(res.height() + offset);
    }

    return res;
}

void SvgPrivate::themeChanged()
{
    if (q->imagePath().isEmpty()) {
        return;
    }

    if (themed) {
        // check if new theme svg wants colorscheme applied
        checkColorHints();
    }

    QString currentPath = themed ? themePath : path;
    themePath.clear();
    eraseRenderer();
    setImagePath(currentPath);
    q->resize();

    // qCDebug(LOG_PLASMA) << themePath << ">>>>>>>>>>>>>>>>>> theme changed";
    Q_EMIT q->repaintNeeded();
}

void SvgPrivate::colorsChanged()
{
    if (!usesColors) {
        return;
    }

    eraseRenderer();
    qCDebug(LOG_PLASMA) << "repaint needed from colorsChanged";

    Q_EMIT q->repaintNeeded();
}

QHash<QString, SharedSvgRenderer::Ptr> SvgPrivate::s_renderers;
QPointer<Theme> SvgPrivate::s_systemColorsCache;
qreal SvgPrivate::s_lastScaleFactor = 1.0;

Svg::Svg(QObject *parent)
    : QObject(parent)
    , d(new SvgPrivate(this))
{
}

Svg::~Svg()
{
    delete d;
}

void Svg::setDevicePixelRatio(qreal ratio)
{
    // be completely integer for now
    // devicepixelratio is always set integer in the svg, so needs at least 192dpi to double up.
    //(it needs to be integer to have lines contained inside a svg piece to keep being pixel aligned)
    if (floor(d->devicePixelRatio) == floor(ratio)) {
        return;
    }

    if (FrameSvg *f = qobject_cast<FrameSvg *>(this)) {
        f->clearCache();
    }

    d->devicePixelRatio = floor(ratio);

    Q_EMIT repaintNeeded();
}

qreal Svg::devicePixelRatio()
{
    return d->devicePixelRatio;
}

void Svg::setScaleFactor(qreal ratio)
{
    // be completely integer for now
    // devicepixelratio is always set integer in the svg, so needs at least 192dpi to double up.
    //(it needs to be integer to have lines contained inside a svg piece to keep being pixel aligned)
    if (floor(d->scaleFactor) == floor(ratio)) {
        return;
    }

    d->scaleFactor = floor(ratio);
    d->s_lastScaleFactor = d->scaleFactor;
    // not resize() because we want to do it unconditionally
    QRectF rect;

    d->naturalSize = SvgRectsCache::instance()->naturalSize(d->path, d->scaleFactor);
    if (d->naturalSize.isEmpty()) {
        d->createRenderer();
        d->naturalSize = d->renderer->defaultSize() * d->scaleFactor;
    }

    d->size = d->naturalSize;

    Q_EMIT repaintNeeded();
    Q_EMIT sizeChanged();
}

qreal Svg::scaleFactor() const
{
    return d->scaleFactor;
}

void Svg::setColorGroup(Plasma::Theme::ColorGroup group)
{
    if (d->colorGroup == group) {
        return;
    }

    d->colorGroup = group;
    d->renderer = nullptr;
    Q_EMIT colorGroupChanged();
    Q_EMIT repaintNeeded();
}

Plasma::Theme::ColorGroup Svg::colorGroup() const
{
    return d->colorGroup;
}

QPixmap Svg::pixmap(const QString &elementID)
{
    if (elementID.isNull() || d->multipleImages) {
        return d->findInCache(elementID, d->devicePixelRatio, size());
    } else {
        return d->findInCache(elementID, d->devicePixelRatio);
    }
}

QImage Svg::image(const QSize &size, const QString &elementID)
{
    QPixmap pix(d->findInCache(elementID, d->devicePixelRatio, size));
    return pix.toImage();
}

void Svg::paint(QPainter *painter, const QPointF &point, const QString &elementID)
{
    Q_ASSERT(painter->device());
    const int ratio = painter->device()->devicePixelRatio();
    QPixmap pix((elementID.isNull() || d->multipleImages) ? d->findInCache(elementID, ratio, size()) : d->findInCache(elementID, ratio));

    if (pix.isNull()) {
        return;
    }

    painter->drawPixmap(QRectF(point, size()), pix, QRectF(QPointF(0, 0), pix.size()));
}

void Svg::paint(QPainter *painter, int x, int y, const QString &elementID)
{
    paint(painter, QPointF(x, y), elementID);
}

void Svg::paint(QPainter *painter, const QRectF &rect, const QString &elementID)
{
    Q_ASSERT(painter->device());
    const int ratio = painter->device()->devicePixelRatio();
    QPixmap pix(d->findInCache(elementID, ratio, rect.size()));

    painter->drawPixmap(QRectF(rect.topLeft(), rect.size()), pix, QRectF(QPointF(0, 0), pix.size()));
}

void Svg::paint(QPainter *painter, int x, int y, int width, int height, const QString &elementID)
{
    Q_ASSERT(painter->device());
    const int ratio = painter->device()->devicePixelRatio();
    QPixmap pix(d->findInCache(elementID, ratio, QSizeF(width, height)));
    painter->drawPixmap(x, y, pix, 0, 0, pix.size().width(), pix.size().height());
}

QSize Svg::size() const
{
    if (d->size.isEmpty()) {
        d->size = d->naturalSize;
    }

    return d->size.toSize();
}

void Svg::resize(qreal width, qreal height)
{
    resize(QSize(width, height));
}

void Svg::resize(const QSizeF &size)
{
    if (qFuzzyCompare(size.width(), d->size.width()) && qFuzzyCompare(size.height(), d->size.height())) {
        return;
    }

    d->size = size;
    Q_EMIT sizeChanged();
}

void Svg::resize()
{
    if (qFuzzyCompare(d->naturalSize.width(), d->size.width()) && qFuzzyCompare(d->naturalSize.height(), d->size.height())) {
        return;
    }

    d->size = d->naturalSize;
    Q_EMIT sizeChanged();
}

QSize Svg::elementSize(const QString &elementId) const
{
    return d->elementRect(elementId).size().toSize();
}

QRectF Svg::elementRect(const QString &elementId) const
{
    return d->elementRect(elementId);
}

bool Svg::hasElement(const QString &elementId) const
{
    if (elementId.isEmpty() || (d->path.isNull() && d->themePath.isNull())) {
        return false;
    }

    return d->elementRect(elementId).isValid();
}

bool Svg::isValid() const
{
    if (d->path.isNull() && d->themePath.isNull()) {
        return false;
    }

    // try very hard to avoid creation of a parser
    QRectF rect;
    QSizeF naturalSize = SvgRectsCache::instance()->naturalSize(d->path, d->scaleFactor);
    if (!naturalSize.isEmpty()) {
        return true;
    }

    if (d->path.isEmpty() || !QFileInfo::exists(d->path)) {
        return false;
    }
    d->createRenderer();
    return d->renderer->isValid();
}

void Svg::setContainsMultipleImages(bool multiple)
{
    d->multipleImages = multiple;
}

bool Svg::containsMultipleImages() const
{
    return d->multipleImages;
}

void Svg::setImagePath(const QString &svgFilePath)
{
    if (d->setImagePath(svgFilePath)) {
        Q_EMIT repaintNeeded();
    }
}

QString Svg::imagePath() const
{
    return d->themed ? d->themePath : d->path;
}

void Svg::setUsingRenderingCache(bool useCache)
{
    d->cacheRendering = useCache;
}

bool Svg::isUsingRenderingCache() const
{
    return d->cacheRendering;
}

bool Svg::fromCurrentTheme() const
{
    return d->fromCurrentTheme;
}

void Svg::setUseSystemColors(bool system)
{
    if (d->useSystemColors == system) {
        return;
    }

    d->useSystemColors = system;
    Q_EMIT repaintNeeded();
}

bool Svg::useSystemColors() const
{
    return d->useSystemColors;
}

void Svg::setTheme(Plasma::Theme *theme)
{
    if (!theme || theme == d->theme.data()) {
        return;
    }

    if (d->theme) {
        disconnect(d->theme.data(), nullptr, this, nullptr);
    }

    d->theme = theme;
    connect(theme, SIGNAL(themeChanged()), this, SLOT(themeChanged()));
    d->themeChanged();
}

Theme *Svg::theme() const
{
    return d->actualTheme();
}

void Svg::setStatus(Plasma::Svg::Status status)
{
    if (status == d->status) {
        return;
    }

    d->status = status;
    d->eraseRenderer();
    Q_EMIT statusChanged(status);
    Q_EMIT repaintNeeded();
}

Svg::Status Svg::status() const
{
    return d->status;
}

} // Plasma namespace

#include "moc_svg.cpp"
#include "private/moc_svg_p.cpp"
