/*
    SPDX-FileCopyrightText: 2013 Marco Martin <mart@kde.org>

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

#include "desktopview.h"
#include "containmentconfigview.h"
#include "krunner_interface.h"
#include "screenpool.h"
#include "shellcorona.h"

#include <QDBusConnection>
#include <QDBusMessage>
#include <QGuiApplication>
#include <QQmlContext>
#include <QQmlEngine>
#include <QQuickItem>
#include <QScreen>
#include <qopenglshaderprogram.h>

#include <PlasmaQuick/AppletQuickItem>

#include <KAuthorized>
#include <KStartupInfo>
#include <KX11Extras>
#include <klocalizedstring.h>
#include <kwindowsystem.h>
#include <plasmaactivities/controller.h>

#include <KPackage/Package>

#include <LayerShellQt/Window>

using namespace Qt::StringLiterals;

DesktopView::DesktopView(Plasma::Corona *corona, QScreen *targetScreen)
    : PlasmaQuick::ContainmentView(corona, nullptr)
    , m_accentColor(Qt::transparent)
{
    QObject::setParent(corona);

    setColor(Qt::black);
    setFlags(Qt::Window | Qt::FramelessWindowHint);

    if (KWindowSystem::isPlatformWayland()) {
        m_layerWindow = LayerShellQt::Window::get(this);
        m_layerWindow->setKeyboardInteractivity(LayerShellQt::Window::KeyboardInteractivityOnDemand);
        m_layerWindow->setExclusiveZone(-1);
        m_layerWindow->setLayer(LayerShellQt::Window::LayerBackground);
        m_layerWindow->setScope(QStringLiteral("desktop"));
        m_layerWindow->setCloseOnDismissed(false);
    } else {
        KX11Extras::setType(winId(), NET::Desktop);
        KX11Extras::setState(winId(), NET::KeepBelow);
    }

    if (targetScreen) {
        setScreenToFollow(targetScreen);
    } else {
        setTitle(corona->kPackage().metadata().name());
    }

    rootContext()->setContextProperty(QStringLiteral("desktop"), this);
    setSource(corona->kPackage().fileUrl("views", QStringLiteral("Desktop.qml")));
    connect(this, &ContainmentView::containmentChanged, this, &DesktopView::slotContainmentChanged);

    QObject::connect(corona, &Plasma::Corona::kPackageChanged, this, &DesktopView::coronaPackageChanged);

    KActivities::Controller *m_activityController = new KActivities::Controller(this);

    QObject::connect(m_activityController, &KActivities::Controller::activityAdded, this, &DesktopView::candidateContainmentsChanged);
    QObject::connect(m_activityController, &KActivities::Controller::activityRemoved, this, &DesktopView::candidateContainmentsChanged);

    // KRunner settings
    KSharedConfig::Ptr config = KSharedConfig::openConfig(QStringLiteral("krunnerrc"));
    KConfigGroup configGroup(config, u"General"_s);
    m_activateKRunnerWhenTypingOnDesktop = configGroup.readEntry("ActivateWhenTypingOnDesktop", true);

    m_configWatcher = KConfigWatcher::create(config);
    connect(m_configWatcher.data(), &KConfigWatcher::configChanged, this, [this](const KConfigGroup &group, const QByteArrayList &names) {
        if (names.contains(QByteArray("ActivateWhenTypingOnDesktop"))) {
            m_activateKRunnerWhenTypingOnDesktop = group.readEntry("ActivateWhenTypingOnDesktop", true);
        }
    });

    // Accent color setting
    connect(static_cast<ShellCorona *>(corona), &ShellCorona::accentColorFromWallpaperEnabledChanged, this, &DesktopView::usedInAccentColorChanged);
    connect(this, &DesktopView::usedInAccentColorChanged, this, [this] {
        if (!usedInAccentColor()) {
            resetAccentColor();
        }
    });

#if PROJECT_VERSION_PATCH >= 80 || PROJECT_VERSION_MINOR >= 80
    m_showPreviewBanner = KConfigGroup(KSharedConfig::openConfig(u"kdeglobals"_s), u"General"_s).readEntry("ShowDesktopPreviewBanner", true);
    Q_EMIT showPreviewBannerChanged();
#endif
}

DesktopView::~DesktopView()
{
}

void DesktopView::showEvent(QShowEvent *e)
{
    QQuickWindow::showEvent(e);
    adaptToScreen();
}

void DesktopView::setScreenToFollow(QScreen *screen)
{
    Q_ASSERT(screen);
    if (screen == m_screenToFollow) {
        return;
    }

    // layer surfaces can't be moved between outputs, so hide and show the window on a new output
    const bool remap = m_layerWindow && isVisible();
    if (remap) {
        setVisible(false);
    }

    if (m_screenToFollow) {
        disconnect(m_screenToFollow.data(), &QScreen::geometryChanged, this, &DesktopView::screenGeometryChanged);
    }
    m_screenToFollow = screen;
    setScreen(screen);
    connect(m_screenToFollow.data(), &QScreen::geometryChanged, this, &DesktopView::screenGeometryChanged);

    if (remap) {
        setVisible(true);
    }

    QString rectString;
    QDebug(&rectString) << screen->geometry();
    setTitle(QStringLiteral("%1 @ %2").arg(corona()->kPackage().metadata().name()).arg(rectString));
    adaptToScreen();
    Q_EMIT screenToFollowChanged(screen);
}

QScreen *DesktopView::screenToFollow() const
{
    return m_screenToFollow;
}

void DesktopView::adaptToScreen()
{
    // This happens sometimes, when shutting down the process
    if (!m_screenToFollow) {
        return;
    }

    screenGeometryChanged();
}

bool DesktopView::usedInAccentColor() const
{
    if (!m_containment) {
        return false;
    }

    const bool notPrimaryDisplay = m_containment->screen() != 0;
    if (notPrimaryDisplay) {
        return false;
    }

    return static_cast<ShellCorona *>(corona())->accentColorFromWallpaperEnabled();
}

QColor DesktopView::accentColor() const
{
    return m_accentColor.value_or(QColor(Qt::transparent));
}

void DesktopView::setAccentColor(const QColor &accentColor)
{
    if (accentColor == m_accentColor) {
        return;
    }

    m_accentColor = accentColor;
    Q_EMIT accentColorChanged(accentColor);
    if (usedInAccentColor()) {
        Q_EMIT static_cast<ShellCorona *>(corona())->colorChanged(accentColor);
    }

    setAccentColorFromWallpaper(accentColor);
}

void DesktopView::resetAccentColor()
{
    if (!m_accentColor.has_value()) {
        return;
    }

    m_accentColor.reset();
    Q_EMIT accentColorChanged(Qt::transparent);
}

#if PROJECT_VERSION_PATCH >= 80 || PROJECT_VERSION_MINOR >= 80
#include <KIO/JobUiDelegateFactory>
#include <KIO/OpenUrlJob>
#include <KMessageBox>
#include <QClipboard>
#include <QGuiApplication>
#include <QMenu>

bool DesktopView::showPreviewBanner() const
{
    return m_showPreviewBanner;
}

QString DesktopView::previewBannerTitle() const
{
    // Plasma 6 pre-release versions
    if constexpr (PROJECT_VERSION_MAJOR == 5 && PROJECT_VERSION_MINOR >= 80) {
        if constexpr (PROJECT_VERSION_PATCH == 80) {
            // Development
            return i18nc("@label %1 is the Plasma version", "KDE Plasma 6.0 Dev");
        } else if constexpr (PROJECT_VERSION_MINOR == 80) {
            // Alpha, 5.80.0
            return i18nc("@label %1 is the Plasma version", "KDE Plasma 6.0 Alpha");
        } else if constexpr (PROJECT_VERSION_MINOR == 90) {
            // Beta 1, 5.90.0
            return i18nc("@label %1 is the Plasma version", "KDE Plasma 6.0 Beta 1");
        } else if constexpr (PROJECT_VERSION_MINOR == 91) {
            // Beta 2, 5.91.0
            return i18nc("@label %1 is the Plasma version", "KDE Plasma 6.0 Beta 2");
        } else if constexpr (PROJECT_VERSION_MINOR == 92) {
            // RC1, 5.92.0
            return i18nc("@label %1 is the Plasma version, RC meaning Release Candidate", "KDE Plasma 6.0 RC1");
        } else if constexpr (PROJECT_VERSION_MINOR == 93) {
            // RC2, 5.93.0
            return i18nc("@label %1 is the Plasma version, RC meaning Release Candidate", "KDE Plasma 6.0 RC2");
        }
    }

    /*
     * Versions are reported as follows:
     *  Development, 5.27.80 -> KDE Plasma 6.0 Dev
     *  Beta,        5.27.90 -> KDE Plasma 6.0 Beta
     *  Development, 6.0.80  -> KDE Plasma 6.1 Dev
     *  Beta,        6.0.90  -> KDE Plasma 6.1 Beta
     *  Beta,        6.0.91  -> KDE Plasma 6.1 Beta 2
     */

    // finalMajor, finalMinor is the final version in the line and
    // should be updated after the final Plasma 6 release
    constexpr int finalMajor = 5;
    constexpr int finalMinor = 27;

    // Incremented minor, which is zeroed and major incremented when
    // we reach the final version in the major release line
    constexpr int major = (PROJECT_VERSION_MAJOR == finalMajor && PROJECT_VERSION_MINOR == finalMinor) ? PROJECT_VERSION_MAJOR + 1 : PROJECT_VERSION_MAJOR;
    constexpr int minor = (PROJECT_VERSION_MAJOR == finalMajor && PROJECT_VERSION_MINOR == finalMinor) ? 0 : PROJECT_VERSION_MINOR + 1;
    const QString version = QStringLiteral("%1.%2").arg(QString::number(major), QString::number(minor));

    if constexpr (PROJECT_VERSION_PATCH == 80) {
        // Development version
        return i18nc("@label %1 is the Plasma version", "KDE Plasma %1 Dev", version);
    } else if constexpr (PROJECT_VERSION_PATCH >= 90) {
        // Beta version
        if constexpr (PROJECT_VERSION_PATCH == 90) {
            return i18nc("@label %1 is the Plasma version", "KDE Plasma %1 Beta", version);
        } else {
            constexpr int betaNumber = PROJECT_VERSION_PATCH - 89;
            return i18nc("@label %1 is the Plasma version, %2 is the beta release number", "KDE Plasma %1 Beta %2", version, betaNumber);
        }
    } else {
        // Unrecognised version
        return i18nc("@label %1 is the Plasma version", "KDE Plasma %1", WORKSPACE_VERSION_STRING);
    }
}

QString DesktopView::previewBannerText() const
{
    return i18nc("@info:usagetip", "Visit bugs.kde.org to report issues");
}

void DesktopView::showPreviewBannerMenu(const QPoint &pos)
{
    auto menu = new QMenu();
    menu->setAttribute(Qt::WA_DeleteOnClose);

    QAction *copyVersionAction = new QAction(QIcon::fromTheme(u"edit-copy-symbolic"_s), i18nc("@action:button", "Copy Plasma Version"));
    connect(copyVersionAction, &QAction::triggered, [] {
        QGuiApplication::clipboard()->setText(QStringLiteral(WORKSPACE_VERSION_STRING));
    });
    menu->addAction(copyVersionAction);

    QAction *reportBugAction = new QAction(QIcon::fromTheme(u"tools-report-bug-symbolic"_s), i18nc("@action:button", "Report a Bug…"));
    connect(reportBugAction, &QAction::triggered, [] {
        auto job = new KIO::OpenUrlJob(QUrl(u"https://bugs.kde.org/"_s));
        job->setUiDelegate(KIO::createDefaultJobUiDelegate(KJobUiDelegate::AutoHandlingEnabled, nullptr));
        job->start();
    });
    menu->addAction(reportBugAction);

    menu->addSeparator();

    auto hideMenu = menu->addMenu(QIcon::fromTheme(u"view-hidden-symbolic"_s), i18nc("@title:menu", "Hide Preview Banner"));

    QAction *hidePreviewBannerTemporarilyAction =
        new QAction(i18nc("@action:button Hide the preview banner until the system is restarted", "Hide Until Restart"));
    connect(hidePreviewBannerTemporarilyAction, &QAction::triggered, [&]() {
        m_showPreviewBanner = false;
        Q_EMIT showPreviewBannerChanged();
    });
    hideMenu->addAction(hidePreviewBannerTemporarilyAction);

    QAction *hidePreviewBannerPermenanentlyAction = new QAction(i18nc("@action:button Hide the preview banner permanently", "Hide Permanently…"));
    connect(hidePreviewBannerPermenanentlyAction, &QAction::triggered, [&]() {
        if (KMessageBox::warningContinueCancel(
                nullptr,
                xi18nc(
                    "@info",
                    "Are you sure you want to permanently hide the preview banner?<nl/><nl/>This action can only be undone by removing the line beginning with "
                    "<icode>ShowDesktopPreviewBanner</icode> in the <filename>kdeglobals</filename> config file."),
                i18nc("@title:window", "Hide Preview Banner?"))
            == KMessageBox::Continue) {
            KConfigGroup config(KSharedConfig::openConfig(u"kdeglobals"_s), u"General"_s);
            config.writeEntry("ShowDesktopPreviewBanner", false);
            config.sync();

            m_showPreviewBanner = false;
            Q_EMIT showPreviewBannerChanged();
        }
    });
    hideMenu->addAction(hidePreviewBannerPermenanentlyAction);

    menu->popup(pos);
}
#endif

QRect DesktopView::strictAvailableScreenRect() const
{
    if (!m_containment) {
        return {};
    }

    int screenId = m_containment->screen();

    // If corona returned an invalid screenId, try to use lastScreen value if it is valid
    if (screenId == -1 && m_containment->lastScreen() > -1) {
        screenId = m_containment->lastScreen();
        // Is this a screen not actually valid?
        if (screenId >= corona()->numScreens()) {
            screenId = -1;
        }
    }

    if (screenId < 0) {
        return {};
    }

    QRect rect = static_cast<ShellCorona *>(corona())->strictAvailableScreenRect(containment()->screen());
    // make it relative
    QRect geometry = corona()->screenGeometry(screenId);
    rect.moveTo(rect.topLeft() - geometry.topLeft());
    return rect;
}

QVariantMap DesktopView::candidateContainmentsGraphicItems() const
{
    QVariantMap map;
    if (!containment()) {
        return map;
    }

    for (auto cont : corona()->containmentsForScreen(containment()->screen())) {
        map[cont->activity()] = QVariant::fromValue(PlasmaQuick::AppletQuickItem::itemForApplet(cont));
    }
    return map;
}

Q_INVOKABLE QString DesktopView::fileFromPackage(const QString &key, const QString &fileName)
{
    return corona()->kPackage().filePath(key.toUtf8(), fileName);
}

bool DesktopView::event(QEvent *e)
{
    if (e->type() == QEvent::FocusOut) {
        m_krunnerText.clear();
    }

    return PlasmaQuick::ContainmentView::event(e);
}

bool DesktopView::handleKRunnerTextInput(QKeyEvent *e)
{
    // allow only Shift and GroupSwitch modifiers
    if (e->modifiers() & ~Qt::ShiftModifier & ~Qt::GroupSwitchModifier) {
        return false;
    }
    bool krunnerTextChanged = false;
    const QString eventText = e->text();
    for (const QChar ch : eventText) {
        if (!ch.isPrint()) {
            continue;
        }
        if (ch.isSpace() && m_krunnerText.isEmpty()) {
            continue;
        }
        m_krunnerText += ch;
        krunnerTextChanged = true;
    }
    if (krunnerTextChanged) {
        const QString interface(QStringLiteral("org.kde.krunner"));
        if (!KAuthorized::authorize(QStringLiteral("run_command"))) {
            return false;
        }
        org::kde::krunner::App krunner(interface, QStringLiteral("/App"), QDBusConnection::sessionBus());
        krunner.query(m_krunnerText);
        return true;
    }
    return false;
}

void DesktopView::keyPressEvent(QKeyEvent *e)
{
    ContainmentView::keyPressEvent(e);

    if (e->isAccepted()) {
        return;
    }

    if (e->key() == Qt::Key_Escape && KWindowSystem::showingDesktop()) {
        KWindowSystem::setShowingDesktop(false);
        e->accept();
        return;
    }

    if (!m_activateKRunnerWhenTypingOnDesktop) {
        return;
    }

    // When a key is pressed on desktop when nothing else is active forward the key to krunner
    if (handleKRunnerTextInput(e)) {
        e->accept();
        return;
    }
}

void DesktopView::showConfigurationInterface(Plasma::Applet *applet)
{
    if (m_configView) {
        if (m_configView->applet() != applet) {
            m_configView->hide();
            m_configView->deleteLater();
        } else {
            m_configView->show();
            auto window = qobject_cast<QWindow *>(m_configView);
            if (window && qGuiApp->nativeInterface<QNativeInterface::QX11Application>()) {
                KStartupInfo::setNewStartupId(window, qgetenv("DESKTOP_STARTUP_ID"));
            }
            m_configView->requestActivate();
            return;
        }
    }

    if (!applet || !applet->containment()) {
        return;
    }

    applet->containment()->corona()->setEditMode(false);

    Plasma::Containment *cont = qobject_cast<Plasma::Containment *>(applet);

    if (cont && cont->isContainment() && cont->containmentType() == Plasma::Containment::Desktop) {
        m_configView = new ContainmentConfigView(cont);
        // if we changed containment with the config open, relaunch the config dialog but for the new containment
        // third arg is used to disconnect when the config closes
        connect(this, &ContainmentView::containmentChanged, m_configView.data(), [this]() {
            if (containment()->property("wallpaperGraphicsObject").value<QObject *>()) {
                showConfigurationInterface(containment());
            } else {
                // BUG 407619: wallpaperConfiguration is invalid after changing layout
                connect(containment(), &Plasma::Containment::wallpaperGraphicsObjectChanged, this, [this] {
                    disconnect(static_cast<Plasma::Containment *>(sender()), &Plasma::Containment::wallpaperGraphicsObjectChanged, this, nullptr);
                    showConfigurationInterface(static_cast<Plasma::Containment *>(sender()));
                });
            }
        });
    } else {
        m_configView = new PlasmaQuick::ConfigView(applet);
    }
    m_configView->init();
    m_configView->setTransientParent(this);
    m_configView->show();
    connect(this, &QObject::destroyed, m_configView, [this] {
        m_configView->hide();
        m_configView->deleteLater();
    });

    auto window = qobject_cast<QWindow *>(m_configView);
    if (window && qGuiApp->nativeInterface<QNativeInterface::QX11Application>()) {
        KStartupInfo::setNewStartupId(window, qgetenv("DESKTOP_STARTUP_ID"));
    }
    m_configView->requestActivate();
}

void DesktopView::slotContainmentChanged()
{
    if (m_containment) {
        disconnect(m_containment, &Plasma::Containment::screenChanged, this, &DesktopView::slotScreenChanged);
        disconnect(m_containment, &Plasma::Containment::availableRelativeScreenRectChanged, this, &DesktopView::strictAvailableScreenRectChanged);
    }

    m_containment = containment();

    if (m_containment) {
        connect(m_containment, &Plasma::Containment::screenChanged, this, &DesktopView::slotScreenChanged);
        slotScreenChanged(m_containment->screen());
        connect(m_containment, &Plasma::Containment::availableRelativeScreenRectChanged, this, &DesktopView::strictAvailableScreenRectChanged);

        QAction *desktopEditMode = new QAction(QIcon::fromTheme(QStringLiteral("document-edit")), i18n("Enter Edit Mode"), m_containment);
        QAction *editMode = m_containment->corona()->action(QStringLiteral("edit mode"));
        m_containment->setInternalAction(QStringLiteral("desktop edit mode"), desktopEditMode);
        connect(desktopEditMode, &QAction::triggered, editMode, &QAction::triggered);
        connect(desktopEditMode, &QAction::triggered, [&]() {
            m_enteredEditMode = true;
        });
        connect(m_containment->corona(), &Plasma::Corona::editModeChanged, this, [&](bool editMode) {
            if (!editMode) {
                m_enteredEditMode = false;
            }
        });
    }
}

bool DesktopView::enteredEditMode() const
{
    return m_enteredEditMode;
}

void DesktopView::slotScreenChanged(int newId)
{
    if (m_containmentScreenId == newId) {
        return;
    }

    m_containmentScreenId = newId;
    Q_EMIT usedInAccentColorChanged();
}

void DesktopView::screenGeometryChanged()
{
    setGeometry(m_screenToFollow->geometry());
    Q_EMIT geometryChanged();
}

void DesktopView::coronaPackageChanged(const KPackage::Package &package)
{
    setContainment(nullptr);
    setSource(package.fileUrl("views", QStringLiteral("Desktop.qml")));
}

void DesktopView::setAccentColorFromWallpaper(const QColor &accentColor)
{
    if (!usedInAccentColor()) {
        return;
    }
    QDBusMessage applyAccentColor = QDBusMessage::createMethodCall(u"org.kde.plasmashell.accentColor"_s, u"/AccentColor"_s, QString(), u"setAccentColor"_s);
    applyAccentColor << accentColor.rgba();
    QDBusConnection::sessionBus().send(applyAccentColor);
}