/*  This file is part of the KDE project
    Copyright (C) 2023 Ivailo Monev <xakepa10@gmail.com>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License version 2, as published by the Free Software Foundation.

    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 "keyboard.h"

#include <QVBoxLayout>
#include <Plasma/Svg>
#include <Plasma/PaintUtils>
#include <Plasma/ToolTipManager>
#include <KIcon>
#include <KStandardDirs>
#include <KDebug>

KeyboardApplet::KeyboardApplet(QObject *parent, const QVariantList &args)
    : Plasma::Applet(parent, args),
    m_keyboardlayout(nullptr),
    m_showflag(false),
    m_showtext(true),
    m_indicatorbox(nullptr),
    m_spacer(nullptr)
{
    KGlobal::locale()->insertCatalog("plasma_applet_keyboard");
    setAspectRatioMode(Plasma::AspectRatioMode::IgnoreAspectRatio);
    setHasConfigurationInterface(true);
    setStatus(Plasma::ItemStatus::PassiveStatus);

    m_keyboardlayout = new KKeyboardLayout(this);
    connect(
        m_keyboardlayout, SIGNAL(layoutChanged()),
        this, SLOT(slotLayoutChanged())
    );
}

void KeyboardApplet::init()
{
    KConfigGroup configgroup = config();
    m_showflag = configgroup.readEntry("showFlag", false);
    m_showtext = configgroup.readEntry("showText", true);

    setGlobalShortcut(KShortcut(Qt::ALT+Qt::CTRL+Qt::Key_K));
    connect(
        this, SIGNAL(activate()),
        this, SLOT(slotNextLayout())
    );
}

void KeyboardApplet::paintInterface(QPainter *painter,
                                    const QStyleOptionGraphicsItem *option,
                                    const QRect &contentsRect)
{
    const KKeyboardType activelayout = m_keyboardlayout->layouts().first();
    const QString layoutlayout = QString::fromLatin1(activelayout.layout.constData(), activelayout.layout.size());

    QString flag;
    if (m_showflag) {
        flag = KStandardDirs::locate(
            "locale",
            QString::fromLatin1("l10n/%1/flag.png").arg(layoutlayout)
        );
    }
    QFont font = KGlobalSettings::smallestReadableFont();
    font.setBold(true);
    font.setPointSize(qMax(font.pointSize(), contentsRect.width()));

    painter->setRenderHint(QPainter::SmoothPixmapTransform);
    painter->setRenderHint(QPainter::Antialiasing);

    if (!flag.isEmpty()) {
        painter->save();
        const QPixmap iconpixmap = QPixmap(flag).scaled(contentsRect.size(), Qt::KeepAspectRatio);
        painter->drawPixmap(contentsRect, iconpixmap);
        painter->restore();
    }

    if (m_showtext) {
        if (!flag.isEmpty()) {
            const QPixmap textpixmap = Plasma::PaintUtils::shadowText(layoutlayout, font, Qt::black, Qt::white, QPoint(), 3);
            painter->drawPixmap(contentsRect, textpixmap);
        } else {
            Plasma::Svg* svg = new Plasma::Svg(this);
            svg->setImagePath("widgets/labeltexture");
            svg->setContainsMultipleImages(true);
            const QPixmap textpixmap = Plasma::PaintUtils::texturedText(layoutlayout, font, svg);
            painter->drawPixmap(contentsRect, textpixmap);
            delete svg;
        }
    }
}

void KeyboardApplet::createConfigurationInterface(KConfigDialog *parent)
{
    QWidget* widget = new QWidget();
    QVBoxLayout* widgetlayout = new QVBoxLayout(widget);
    m_indicatorbox = new QComboBox(widget);
    m_indicatorbox->addItem(i18n("Show text"));
    m_indicatorbox->addItem(i18n("Show flag"));
    m_indicatorbox->addItem(i18n("Show text and flag"));
    if (m_showflag && m_showtext) {
        m_indicatorbox->setCurrentIndex(2);
    } else if (m_showflag) {
        m_indicatorbox->setCurrentIndex(1);
    } else {
        m_indicatorbox->setCurrentIndex(0);
    }
    widgetlayout->addWidget(m_indicatorbox);
    m_spacer = new QSpacerItem(1, 1, QSizePolicy::Expanding, QSizePolicy::Expanding);
    widgetlayout->addSpacerItem(m_spacer);
    widget->setLayout(widgetlayout);
    parent->addPage(widget, i18n("Indicator"), "applications-graphics");

    connect(parent, SIGNAL(applyClicked()), this, SLOT(slotConfigAccepted()));
    connect(parent, SIGNAL(okClicked()), this, SLOT(slotConfigAccepted()));
    connect(m_indicatorbox, SIGNAL(currentIndexChanged(int)), parent, SLOT(settingsModified()));
}
void KeyboardApplet::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        slotNextLayout();
        event->accept();
        return;
    }
    event->ignore();
}

void KeyboardApplet::wheelEvent(QGraphicsSceneWheelEvent *event)
{
    if (event->delta() < 0) {
        slotNextLayout();
    } else {
        slotPreviousLayout();
    }
}

void KeyboardApplet::slotLayoutChanged()
{
    const QList<KKeyboardType> layouts = m_keyboardlayout->layouts();
    const KKeyboardType activelayout = layouts.first();
    const QString layoutlayout = QString::fromLatin1(activelayout.layout.constData(), activelayout.layout.size());
    const QString flag = KStandardDirs::locate(
        "locale",
        QString::fromLatin1("l10n/%1/flag.png").arg(layoutlayout)
    );
    QString layouttooltip;
    layouttooltip.append(i18n("Model: %1<br/>", KKeyboardLayout::modelDescription(activelayout.model)));
    layouttooltip.append(i18n("Variant: %1", KKeyboardLayout::variantDescription(activelayout.layout, activelayout.variant)));
    Plasma::ToolTipContent plasmatooltipcontent = Plasma::ToolTipContent(
        KKeyboardLayout::layoutDescription(activelayout.layout), layouttooltip,
        KIcon(flag)
    );
    Plasma::ToolTipManager::self()->setContent(this, plasmatooltipcontent);

    if (layouts.size() > 1) {
        setStatus(Plasma::ItemStatus::ActiveStatus);
    } else {
        setStatus(Plasma::ItemStatus::PassiveStatus);
    }

    update();
}

void KeyboardApplet::slotNextLayout()
{
    QList<KKeyboardType> layouts = m_keyboardlayout->layouts();
    if (layouts.size() > 1) {
        layouts.move(0, layouts.size() - 1);
        m_keyboardlayout->setLayouts(layouts);
    }
}

void KeyboardApplet::slotPreviousLayout()
{
    QList<KKeyboardType> layouts = m_keyboardlayout->layouts();
    if (layouts.size() > 1) {
        layouts.move(layouts.size() - 1, 0);
        m_keyboardlayout->setLayouts(layouts);
    }
}

void KeyboardApplet::slotConfigAccepted()
{
    Q_ASSERT(m_indicatorbox);
    const int iconindex = m_indicatorbox->currentIndex();
    m_showflag = (iconindex == 1 || iconindex == 2);
    m_showtext = (iconindex == 0 || iconindex == 2);
    KConfigGroup configgroup = config();
    configgroup.writeEntry("showFlag", m_showflag);
    configgroup.writeEntry("showText", m_showtext);
    emit configNeedsSaving();
    update();
}

#include "moc_keyboard.cpp"