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/*
    Copyright 1997 Mark Donohoe
    Copyright 1999 Lars Knoll
    Copyright 2000 Rik Hemsley
    Copyright 2015 Antonis Tsiapaliokas <antonis.tsiapaliokas@kde.org>
    Copyright 2017 Marco Martin <mart@kde.org>

    Ported to kcontrol2 by Geert Jansen.

    This library 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 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/


#include "fonts.h"

#include <QQuickItem>
#include <QWindow>
#include <QQmlEngine>
#include <QQuickView>
#include <QDebug>
#include <QFontDialog>
#include <QApplication>
#include <QFontDatabase>

#include <KAcceleratorManager>
#include <KGlobalSettings>
#include <KConfigGroup>
#include <KConfig>
#include <KAboutData>
#include <KLocalizedString>
#include <KPluginFactory>
#include <KFontDialog>
#include <KWindowSystem>
#include <KMessageBox>

#include "../krdb/krdb.h"
#include "previewimageprovider.h"

/**** DLL Interface ****/
K_PLUGIN_FACTORY_WITH_JSON(KFontsFactory, "kcm_fonts.json", registerPlugin<KFonts>();)

//from KFontRequester
// Determine if the font with given properties is available on the system,
// otherwise find and return the best fitting combination.
static QFont nearestExistingFont(const QFont &font)
{
    QFontDatabase dbase;

    // Initialize font data accoring to given font object.
    QString family = font.family();
    QString style = dbase.styleString(font);
    qreal size = font.pointSizeF();

    // Check if the family exists.
    const QStringList families = dbase.families();
    if (!families.contains(family)) {
        // Chose another family.
        family = QFontInfo(font).family(); // the nearest match
        if (!families.contains(family)) {
            family = families.count() ? families.at(0) : QStringLiteral("fixed");
        }
    }

    // Check if the family has the requested style.
    // Easiest by piping it through font selection in the database.
    QString retStyle = dbase.styleString(dbase.font(family, style, 10));
    style = retStyle;

    // Check if the family has the requested size.
    // Only for bitmap fonts.
    if (!dbase.isSmoothlyScalable(family, style)) {
        QList<int> sizes = dbase.smoothSizes(family, style);
        if (!sizes.contains(size)) {
            // Find nearest available size.
            int mindiff = 1000;
            int refsize = size;
            Q_FOREACH (int lsize, sizes) {
                int diff = qAbs(refsize - lsize);
                if (mindiff > diff) {
                    mindiff = diff;
                    size = lsize;
                }
            }
        }
    }

    // Select the font with confirmed properties.
    QFont result = dbase.font(family, style, int(size));
    if (dbase.isSmoothlyScalable(family, style) && result.pointSize() == floor(size)) {
        result.setPointSizeF(size);
    }
    return result;
}

/**** FontAASettings ****/
#if defined(HAVE_FONTCONFIG) && defined (HAVE_X11)
FontAASettings::FontAASettings(QObject *parent)
    : QObject(parent)
    , m_subPixelOptionsModel(new QStandardItemModel(this))
    , m_hintingOptionsModel(new QStandardItemModel(this))
{
    for (int t = KXftConfig::SubPixel::NotSet; t <= KXftConfig::SubPixel::Vbgr; ++t) {
        QStandardItem *item = new QStandardItem(KXftConfig::description((KXftConfig::SubPixel::Type)t));
        m_subPixelOptionsModel->appendRow(item);
    }

    for (int s = KXftConfig::Hint::NotSet; s <= KXftConfig::Hint::Full; ++s) {
        QStandardItem * item = new QStandardItem(KXftConfig::description((KXftConfig::Hint::Style)s));
        m_hintingOptionsModel->appendRow(item);
    }
}

void FontAASettings::load()
{
    double     from, to;
    KXftConfig xft;

    if (xft.getExcludeRange(from, to)) {
        m_excludeFrom = from;
        m_excludeTo = to;
        setExclude(true);
    } else {
        m_excludeFrom = 8;
        m_excludeTo = 15;
        setExclude(false);
    }
    m_excludeFromOriginal = m_excludeFrom;
    m_excludeToOriginal = m_excludeTo;
    excludeToChanged();
    excludeFromChanged();

    KXftConfig::SubPixel::Type spType;
    xft.getSubPixelType(spType);

    setSubPixelCurrentIndex(spType);
    m_subPixelCurrentIndexOriginal = spType;

    KXftConfig::Hint::Style hStyle;

    if (!xft.getHintStyle(hStyle) || KXftConfig::Hint::NotSet == hStyle) {
        KConfig kglobals("kdeglobals", KConfig::NoGlobals);

        hStyle = KXftConfig::Hint::NotSet;
        xft.setHintStyle(hStyle);
        KConfigGroup(&kglobals, "General").writeEntry("XftHintStyle", KXftConfig::toStr(hStyle));
        kglobals.sync();
        runRdb(KRdbExportXftSettings | KRdbExportGtkTheme);
    }

    setHintingCurrentIndex(hStyle);
    m_hintingCurrentIndexOriginal = hStyle;

    KConfig _cfgfonts("kcmfonts");
    KConfigGroup cfgfonts(&_cfgfonts, "General");

    int dpicfg;
    if (KWindowSystem::isPlatformWayland()) {
        dpicfg = cfgfonts.readEntry("forceFontDPIWayland", 0);
    } else {
        dpicfg = cfgfonts.readEntry("forceFontDPI", 0);
    }

    if (dpicfg <= 0) {
        m_dpiOriginal = 0;
    } else {
        m_dpiOriginal = dpicfg;
    };

    setDpi(dpicfg);

    KSharedConfig::Ptr config = KSharedConfig::openConfig("kdeglobals");
    KConfigGroup cg(config, "General");

    if (cfgfonts.readEntry("dontChangeAASettings", true)) {
        setAntiAliasing(1); //AASystem
    } else if (cg.readEntry("XftAntialias", true)) {
        setAntiAliasing(0); //AAEnabled
    } else {
        setAntiAliasing(2); //AADisabled
    }
    m_antiAliasingOriginal = m_antiAliasing;
}

bool FontAASettings::save(KXftConfig::AntiAliasing::State aaState)
{
    KXftConfig   xft;
    KConfig      kglobals("kdeglobals", KConfig::NoGlobals);
    KConfigGroup grp(&kglobals, "General");

    xft.setAntiAliasing(aaState);
    if (m_exclude) {
        xft.setExcludeRange(m_excludeFrom, m_excludeTo);
    } else {
        xft.setExcludeRange(0, 0);
    }

    KXftConfig::SubPixel::Type spType = (KXftConfig::SubPixel::Type)m_subPixelCurrentIndex;

    xft.setSubPixelType(spType);
    grp.writeEntry("XftSubPixel", KXftConfig::toStr(spType));
    if (aaState == KXftConfig::AntiAliasing::NotSet) {
        grp.revertToDefault("XftAntialias");
    } else {
        grp.writeEntry("XftAntialias", aaState == KXftConfig::AntiAliasing::Enabled);
    }

    bool mod = false;
    KXftConfig::Hint::Style hStyle = (KXftConfig::Hint::Style)m_hintingCurrentIndex;

    xft.setHintStyle(hStyle);

    QString hs(KXftConfig::toStr(hStyle));

    if (hs != grp.readEntry("XftHintStyle")) {
        if (KXftConfig::Hint::NotSet == hStyle) {
            grp.revertToDefault("XftHintStyle");
        } else {
            grp.writeEntry("XftHintStyle", hs);
        }
    }
    mod = true;
    kglobals.sync();

    if (!mod) {
        mod = xft.changed();
    }

    xft.apply();

    KConfig _cfgfonts("kcmfonts");
    KConfigGroup cfgfonts(&_cfgfonts, "General");

    if (KWindowSystem::isPlatformWayland()) {
        cfgfonts.writeEntry("forceFontDPIWayland", m_dpi);
    } else {
        cfgfonts.writeEntry("forceFontDPI", m_dpi);
    }

    cfgfonts.sync();

#if HAVE_X11
    // if the setting is reset in the module, remove the dpi value,
    // otherwise don't explicitly remove it and leave any possible system-wide value
    if (m_dpi == 0 && m_dpiOriginal != 0 && !KWindowSystem::isPlatformWayland()) {
        QProcess proc;
        proc.setProcessChannelMode(QProcess::ForwardedChannels);
        proc.start("xrdb", QStringList() << "-quiet" << "-remove" << "-nocpp");
        if (proc.waitForStarted()) {
            proc.write(QByteArray("Xft.dpi\n"));
            proc.closeWriteChannel();
            proc.waitForFinished();
        }
    }
#endif

    QApplication::processEvents();			// Process font change ourselves

    // Don't overwrite global settings unless explicitly asked for - e.g. the system
    // fontconfig setup may be much more complex than this module can provide.
    // TODO: With AASystem the changes already made by this module should be reverted somehow.
#if defined(HAVE_FONTCONFIG) && defined (HAVE_X11)
    if (mod || (m_antiAliasing != m_antiAliasingOriginal) || m_dpi != m_dpiOriginal) {
        KMessageBox::information(0,
                                 i18n(
                                     "<p>Some changes such as anti-aliasing or DPI will only affect newly started applications.</p>"
                                 ), i18n("Font Settings Changed"), "FontSettingsChanged");
        m_antiAliasingOriginal = m_antiAliasing;
        m_dpiOriginal = m_dpi;
    }
#else
#if HAVE_X11
    if (m_dpi != m_dpiOriginal) {
        KMessageBox::information(0,
                                 i18n(
                                     "<p>Some changes such as DPI will only affect newly started applications.</p>"
                                 ), i18n("Font Settings Changed"), "FontSettingsChanged");
        m_dpiOriginal = m_dpi;
    }
#endif
#endif

    m_excludeToOriginal = m_excludeTo;
    m_excludeFromOriginal = m_excludeFrom;
    
    m_subPixelCurrentIndexOriginal = m_subPixelCurrentIndex;
    m_hintingCurrentIndexOriginal = m_hintingCurrentIndex;

    return mod;
}

void FontAASettings::defaults()
{
    setExcludeTo(15);
    setExcludeFrom(8);
    setAntiAliasing(1);
    m_antiAliasingOriginal = m_antiAliasing;
    setDpi(0);
    setSubPixelCurrentIndex(KXftConfig::SubPixel::NotSet);
    setHintingCurrentIndex(KXftConfig::Hint::NotSet);
}

#endif

void FontAASettings::setExclude(bool exclude)
{
    if (exclude == m_exclude) {
        return;
    }

    m_exclude = exclude;
    emit excludeChanged();
}

bool FontAASettings::exclude() const
{
    return m_exclude;
}

void FontAASettings::setExcludeTo(const int &excludeTo)
{
    if (m_excludeTo == excludeTo) {
        return;
    }

    m_excludeTo = excludeTo;
    emit excludeToChanged();
}

int FontAASettings::excludeTo() const
{
    return m_excludeTo;
}

void FontAASettings::setExcludeFrom(const int &excludeTo)
{
    if (m_excludeFrom == excludeTo) {
        return;
    }

    m_excludeFrom = excludeTo;
    emit excludeToChanged();
}

int FontAASettings::excludeFrom() const
{
    return m_excludeFrom;
}

void FontAASettings::setAntiAliasing(const int &antiAliasing)
{
    if (m_antiAliasing == antiAliasing) {
        return;
    }

    m_antiAliasing = antiAliasing;
    emit aliasingChanged();
}

int FontAASettings::antiAliasing() const
{
    return m_antiAliasing;
}

void FontAASettings::setDpi(const int &dpi)
{
    if (m_dpi == dpi) {
        return;
    }

    m_dpi = dpi;
    emit dpiChanged();
}

int FontAASettings::dpi() const
{
    return m_dpi;
}

void FontAASettings::setSubPixelCurrentIndex(int idx)
{
    if (m_subPixelCurrentIndex == idx) {
        return;
    }

    m_subPixelCurrentIndex = idx;
    emit subPixelCurrentIndexChanged();
}

int FontAASettings::subPixelCurrentIndex()
{
    return m_subPixelCurrentIndex;
}

void FontAASettings::setHintingCurrentIndex(int idx)
{
    if (m_hintingCurrentIndex == idx) {
        return;
    }

    m_hintingCurrentIndex = idx;
    emit hintingCurrentIndexChanged();
}

int FontAASettings::hintingCurrentIndex()
{
    return m_hintingCurrentIndex;
}

bool FontAASettings::needsSave() const
{
    return m_excludeTo != m_excludeToOriginal
        || m_excludeFrom != m_excludeFromOriginal
        || m_antiAliasing != m_antiAliasingOriginal
        || m_dpi != m_dpiOriginal
        || m_subPixelCurrentIndex != m_subPixelCurrentIndexOriginal
        || m_hintingCurrentIndex != m_hintingCurrentIndexOriginal;
}


/**** KFonts ****/

KFonts::KFonts(QObject *parent, const QVariantList &args)
    : KQuickAddons::ConfigModule(parent, args)
    , m_fontAASettings(new FontAASettings(this))
{
    qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
    KAboutData* about = new KAboutData("kcm_fonts", i18n("Configure Fonts"),
                                       "0.1", QString(), KAboutLicense::LGPL);
    about->addAuthor(i18n("Antonis Tsiapaliokas"), QString(), "antonis.tsiapaliokas@kde.org");
    setAboutData(about);
    qmlRegisterType<QStandardItemModel>();
    setButtons(Apply | Default);

    auto updateState = [this]() {
        setNeedsSave(m_fontAASettings->needsSave());
    };

    connect(m_fontAASettings, &FontAASettings::subPixelCurrentIndexChanged, this, updateState);
    connect(m_fontAASettings, &FontAASettings::hintingCurrentIndexChanged, this, updateState);
    connect(m_fontAASettings, &FontAASettings::excludeToChanged, this, updateState);
    connect(m_fontAASettings, &FontAASettings::antiAliasingChanged, this, updateState);
    connect(m_fontAASettings, &FontAASettings::aliasingChanged, this, updateState);
    connect(m_fontAASettings, &FontAASettings::dpiChanged, this, updateState);
}

KFonts::~KFonts()
{
}

void KFonts::defaults()
{
#ifdef Q_OS_MAC
    setGeneralFont(QFont("Lucida Grande", 13));
    setMenuFont(QFont("Lucida Grande", 13));
    setFixedWidthFont(QFont("Monaco", 10));
    setToolbarFont(QFont("Lucida Grande", 11));
    setSmallFont(QFont("Lucida Grande", 9));
    setWindowTitleFont(QFont("Lucida Grande", 14));
#else
    setGeneralFont(QFont("Noto Sans", 10));
    setMenuFont(QFont("Noto Sans", 10));
    setFixedWidthFont(QFont("Hack", 9));
    setToolbarFont(QFont("Noto Sans", 10));
    setSmallFont(QFont("Noto Sans", 8));
    setWindowTitleFont(QFont("Noto Sans", 10));
#endif

    m_fontAASettings->defaults();
}

void KFonts::load()
{
    KSharedConfig::Ptr config = KSharedConfig::openConfig("kdeglobals");

    KConfigGroup cg(config, "General");
    m_generalFont = m_generalFontOriginal = nearestExistingFont(cg.readEntry("font", m_defaultFont));


    m_fixedWidthFont = m_fixedWidthFontOriginal = nearestExistingFont(cg.readEntry("fixed", QFont("Hack", 9)));

    m_smallFont = m_smallFontOriginal = nearestExistingFont(cg.readEntry("smallestReadableFont", m_defaultFont));

    m_toolbarFont = m_toolbarFontOriginal = nearestExistingFont(cg.readEntry("toolBarFont", m_defaultFont));

    m_menuFont = m_menuFontOriginal = nearestExistingFont(cg.readEntry("menuFont", m_defaultFont));

    cg = KConfigGroup(config, "WM");
    m_windowTitleFont = m_windowTitleFontOriginal = nearestExistingFont(cg.readEntry("activeFont", m_defaultFont));

    engine()->addImageProvider("preview", new PreviewImageProvider(generalFont()));
    
    emit generalFontChanged();
    emit fixedWidthFontChanged();
    emit smallFontChanged();
    emit toolbarFontChanged();
    emit menuFontChanged();
    emit windowTitleFontChanged();

    m_fontAASettings->load();
    setNeedsSave(false);
}

void KFonts::save()
{
    KSharedConfig::Ptr config = KSharedConfig::openConfig("kdeglobals");

    KConfigGroup cg(config, "General");
    cg.writeEntry("font", m_generalFont.toString());
    cg.writeEntry("fixed", m_fixedWidthFont.toString());
    cg.writeEntry("smallestReadableFont", m_smallFont.toString());
    cg.writeEntry("toolBarFont", m_toolbarFont.toString());
    cg.writeEntry("menuFont", m_menuFont.toString());
    cg.sync();
    cg = KConfigGroup(config, "WM");
    cg.writeEntry("activeFont", m_windowTitleFont.toString());
    cg.sync();

    m_defaultFontOriginal = m_defaultFont;
    m_generalFontOriginal = m_generalFont;
    m_fixedWidthFontOriginal = m_fixedWidthFont;
    m_smallFontOriginal = m_smallFont;
    m_toolbarFontOriginal = m_toolbarFont;
    m_menuFontOriginal = m_menuFont;
    m_windowTitleFontOriginal = m_windowTitleFont;

    KConfig _cfgfonts("kcmfonts");
    KConfigGroup cfgfonts(&_cfgfonts, "General");

    FontAASettings::AASetting aaSetting = (FontAASettings::AASetting)m_fontAASettings->antiAliasing();
    cfgfonts.writeEntry("dontChangeAASettings", aaSetting == FontAASettings::AASystem);

    if (aaSetting == FontAASettings::AAEnabled) {
        m_fontAASettings->save(KXftConfig::AntiAliasing::Enabled);
    } else if (aaSetting == FontAASettings::AADisabled) {
        m_fontAASettings->save(KXftConfig::AntiAliasing::Disabled);
    } else {
        m_fontAASettings->save(KXftConfig::AntiAliasing::NotSet);
    }

    KGlobalSettings::self()->emitChange(KGlobalSettings::FontChanged);

    runRdb(KRdbExportXftSettings | KRdbExportGtkTheme);

    emit fontsHaveChanged();
    setNeedsSave(false);
}

void KFonts::updateNeedsSave()
{
    setNeedsSave(m_defaultFontOriginal != m_defaultFont ||
                 m_generalFontOriginal != m_generalFont ||
                 m_fixedWidthFontOriginal != m_fixedWidthFont ||
                 m_smallFontOriginal != m_smallFont ||
                 m_toolbarFontOriginal != m_toolbarFont ||
                 m_menuFontOriginal != m_menuFont ||
                 m_windowTitleFontOriginal != m_windowTitleFont ||
                m_fontAASettings->needsSave());
}

void KFonts::setGeneralFont(const QFont &font)
{
    if (m_generalFont == font) {
        return;
    }

    m_generalFont = font;
    emit generalFontChanged();
    updateNeedsSave();
}

QFont KFonts::generalFont() const
{
    return m_generalFont;
}

void KFonts::setFixedWidthFont(const QFont &font)
{
    if (m_fixedWidthFont == font) {
        return;
    }

    m_fixedWidthFont = font;
    emit fixedWidthFontChanged();
    updateNeedsSave();
}

QFont KFonts::fixedWidthFont() const
{
    return m_fixedWidthFont;
}

void KFonts::setSmallFont(const QFont &font)
{
    if (m_smallFont == font) {
        return;
    }

    m_smallFont = font;
    emit smallFontChanged();
    updateNeedsSave();
}

QFont KFonts::smallFont() const
{
    return m_smallFont;
}

void KFonts::setToolbarFont(const QFont &font)
{
    if (m_toolbarFont == font) {
        return;
    }

    m_toolbarFont = font;
    emit toolbarFontChanged();
    updateNeedsSave();
}

QFont KFonts::toolbarFont() const
{
    return m_toolbarFont;
}

void KFonts::setMenuFont(const QFont &font)
{
    if (m_menuFont == font) {
        return;
    }

    m_menuFont = font;
    emit menuFontChanged();
    updateNeedsSave();
}

QFont KFonts::menuFont() const
{
    return m_menuFont;
}

void KFonts::setWindowTitleFont(const QFont &font)
{
    if (m_windowTitleFont == font) {
        return;
    }

    m_windowTitleFont = font;
    emit windowTitleFontChanged();
    updateNeedsSave();
}

QFont KFonts::windowTitleFont() const
{
    return m_windowTitleFont;
}

void KFonts::adjustAllFonts()
{
    QFont font = m_generalFont;
    KFontChooser::FontDiffFlags fontDiffFlags = 0;
    int ret = KFontDialog::getFontDiff(font, fontDiffFlags, KFontChooser::NoDisplayFlags);

    if (ret == KDialog::Accepted && fontDiffFlags) {
        setGeneralFont(applyFontDiff(m_generalFont, font, fontDiffFlags));
        setMenuFont(applyFontDiff(m_menuFont, font, fontDiffFlags));
        {
            const QFont adjustedFont = applyFontDiff(m_fixedWidthFont, font, fontDiffFlags);
            if (QFontInfo(adjustedFont).fixedPitch()) {
                setFixedWidthFont(adjustedFont);
            }
        }
        setToolbarFont(applyFontDiff(m_toolbarFont, font, fontDiffFlags));
        setSmallFont(applyFontDiff(m_smallFont, font, fontDiffFlags));
        setWindowTitleFont(applyFontDiff(m_windowTitleFont, font, fontDiffFlags));
    }
}

QFont KFonts::applyFontDiff(const QFont &fnt, const QFont &newFont, int fontDiffFlags)
{
    QFont font(fnt);

    if (fontDiffFlags & KFontChooser::FontDiffSize) {
        font.setPointSizeF(newFont.pointSizeF());
    }
    if ((fontDiffFlags & KFontChooser::FontDiffFamily)) {
        font.setFamily(newFont.family());
    }
    if (fontDiffFlags & KFontChooser::FontDiffStyle) {
        font.setWeight(newFont.weight());
        font.setStyle(newFont.style());
        font.setUnderline(newFont.underline());
        font.setStyleName(newFont.styleName());
    }

    return font;
}

#include "fonts.moc"