/*
    SPDX-FileCopyrightText: 2007 Aaron Seigo <aseigo@kde.org>
    SPDX-FileCopyrightText: 2008 Ménard Alexis <darktears31@gmail.com>
    SPDX-FileCopyrightText: 2009 Chani Armitage <chani@kde.org>
    SPDX-FileCopyrightText: 2012 Marco Martin <notmart@kde.org>

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

#include "containment.h"
#include "private/containment_p.h"

#include "config-plasma.h"

#include <QClipboard>
#include <QContextMenuEvent>
#include <QDebug>
#include <QFile>
#include <QMimeData>
#include <QMimeDatabase>
#include <QPainter>
#include <QQuickItem>
#include <QTemporaryFile>

#include <KAuthorized>
#include <KConfigLoader>
#include <KConfigSkeleton>
#include <KLocalizedString>

#include <plasmaactivities/info.h>

#include "containmentactions.h"
#include "corona.h"
#include "debug_p.h"
#include "pluginloader.h"

#include "private/applet_p.h"

#include "plasma/plasma.h"

namespace Plasma
{
Containment::Containment(QObject *parentObject, const KPluginMetaData &data, const QVariantList &args)
    : Applet(parentObject, data, args)
    , d(new ContainmentPrivate(this))
{
    // WARNING: do not access config() OR globalConfig() in this method!
    //          that requires a scene, which is not available at this point
    setHasConfigurationInterface(true);

    // Try to determine the containment type. It must be done as soon as possible
    const QString type = pluginMetaData().value(QStringLiteral("X-Plasma-ContainmentType"));
    QMetaEnum metaEnum = QMetaEnum::fromType<Plasma::Containment::Type>();
    d->type = (Plasma::Containment::Type)metaEnum.keyToValue(type.toLocal8Bit().constData());
    if (d->type == Plasma::Containment::Type::NoContainment) {
        qCWarning(LOG_PLASMA) << "Unknown containment type requested:" << type << pluginMetaData().fileName()
                              << "check Plasma::Containment::Type for supported values";
    }
}

Containment::~Containment()
{
    disconnect(corona(), nullptr, this, nullptr);
    qDeleteAll(d->localActionPlugins);
    delete d;
}

void Containment::init()
{
    Applet::init();

    connect(corona(), &Plasma::Corona::availableScreenRectChanged, this, [this](int screenId) {
        if (screenId == screen()) {
            Q_EMIT availableRelativeScreenRectChanged(availableRelativeScreenRect());
        }
    });
    connect(corona(), &Plasma::Corona::availableScreenRegionChanged, this, [this](int screenId) {
        if (screenId == screen()) {
            Q_EMIT availableRelativeScreenRegionChanged(availableRelativeScreenRegion());
        }
    });
    connect(corona(), &Plasma::Corona::screenGeometryChanged, this, [this](int screenId) {
        if (screenId == screen()) {
            Q_EMIT screenGeometryChanged(screenGeometry());
        }
    });

    QMap<QString, QAction *> actions = static_cast<Applet *>(this)->d->actions;
    // connect actions
    ContainmentPrivate::addDefaultActions(actions, this);
    bool unlocked = immutability() == Types::Mutable;

    // fix the text of the actions that need title()
    // btw, do we really want to use title() when it's a desktopcontainment?
    QAction *closeApplet = internalAction(QStringLiteral("remove"));
    if (closeApplet) {
        closeApplet->setText(i18nc("%1 is the name of the applet", "Remove %1", title()));
    }

    QAction *configAction = internalAction(QStringLiteral("configure"));
    if (configAction) {
        if (d->type == Containment::Type::Panel || d->type == Containment::Type::CustomPanel) {
            configAction->setText(i18n("Enter Edit Mode"));
            configAction->setIcon(QIcon::fromTheme(QStringLiteral("document-edit")));
        } else {
            configAction->setText(i18nc("%1 is the name of the applet", "Configure %1...", title()));
        }
    }

    QAction *appletBrowserAction = internalAction(QStringLiteral("add widgets"));
    if (appletBrowserAction) {
        appletBrowserAction->setVisible(unlocked);
        appletBrowserAction->setEnabled(unlocked);
        connect(appletBrowserAction, SIGNAL(triggered()), this, SLOT(triggerShowAddWidgets()));
    }

    if (immutability() != Types::SystemImmutable && corona()) {
        QAction *lockDesktopAction = corona()->action(QStringLiteral("lock widgets"));
        // keep a pointer so nobody notices it moved to corona
        if (lockDesktopAction) {
            setInternalAction(QStringLiteral("lock widgets"), lockDesktopAction);
        }
    }

    // HACK: this is valid only in the systray case
    connect(this, &Containment::configureRequested, this, [this](Plasma::Applet *a) {
        if (Plasma::Applet *p = qobject_cast<Plasma::Applet *>(parent())) {
            Q_EMIT p->containment()->configureRequested(a);
        }
    });
}

// helper function for sorting the list of applets
bool appletConfigLessThan(const KConfigGroup &c1, const KConfigGroup &c2)
{
    int i1 = c1.readEntry("id", 0);
    int i2 = c2.readEntry("id", 0);

    return (i1 < i2);
}

void Containment::restore(KConfigGroup &group)
{
    /*
    #ifndef NDEBUG
    // qCDebug(LOG_PLASMA) << "!!!!!!!!!!!!initConstraints" << group.name() << d->type;
    // qCDebug(LOG_PLASMA) << "    location:" << group.readEntry("location", (int)d->location);
    // qCDebug(LOG_PLASMA) << "    geom:" << group.readEntry("geometry", geometry());
    // qCDebug(LOG_PLASMA) << "    formfactor:" << group.readEntry("formfactor", (int)d->formFactor);
    // qCDebug(LOG_PLASMA) << "    screen:" << group.readEntry("screen", d->screen);
    #endif
    */
    setLocation((Plasma::Types::Location)group.readEntry("location", (int)d->location));
    setFormFactor((Plasma::Types::FormFactor)group.readEntry("formfactor", (int)d->formFactor));
    d->lastScreen = group.readEntry("lastScreen", d->lastScreen);

    setWallpaperPlugin(group.readEntry("wallpaperplugin", ContainmentPrivate::defaultWallpaperPlugin));

    d->activityId = group.readEntry("activityId", QString());

    flushPendingConstraintsEvents();
    restoreContents(group);
    setImmutability((Types::ImmutabilityType)group.readEntry("immutability", (int)Types::Mutable));

    if (isContainment() && KAuthorized::authorize(QStringLiteral("plasma/containment_actions"))) {
        KConfigGroup cfg = KConfigGroup(corona()->config(), QStringLiteral("ActionPlugins"));
        cfg = KConfigGroup(&cfg, QString::number((int)containmentType()));

        // qCDebug(LOG_PLASMA) << cfg.keyList();
        if (cfg.exists()) {
            const auto keyList = cfg.keyList();
            for (const QString &key : keyList) {
                // qCDebug(LOG_PLASMA) << "loading" << key;
                setContainmentActions(key, cfg.readEntry(key, QString()));
            }
        } else { // shell defaults
            KConfigGroup defaultActionsCfg;

            switch (d->type) {
            case Plasma::Containment::Type::Panel:
            /* fall through*/
            case Plasma::Containment::Type::CustomPanel:
                defaultActionsCfg = KConfigGroup(KSharedConfig::openConfig(corona()->kPackage().filePath("defaults")), QStringLiteral("Panel"));
                break;
            case Plasma::Containment::Type::Desktop:
                defaultActionsCfg = KConfigGroup(KSharedConfig::openConfig(corona()->kPackage().filePath("defaults")), QStringLiteral("Desktop"));
                break;
            default:
                // for any other type of containment, there are no defaults
                break;
            }
            if (defaultActionsCfg.isValid()) {
                defaultActionsCfg = KConfigGroup(&defaultActionsCfg, QStringLiteral("ContainmentActions"));
                const auto keyList = defaultActionsCfg.keyList();
                for (const QString &key : keyList) {
                    setContainmentActions(key, defaultActionsCfg.readEntry(key, QString()));
                }
            }
        }
    }
    Applet::restore(group);
}

void Containment::save(KConfigGroup &g) const
{
    if (Applet::d->transient) {
        return;
    }

    KConfigGroup group = g;
    if (!group.isValid()) {
        group = config();
    }

    // locking is saved in Applet::save
    Applet::save(group);

    //     group.writeEntry("screen", d->screen);
    group.writeEntry("lastScreen", d->lastScreen);
    group.writeEntry("formfactor", (int)d->formFactor);
    group.writeEntry("location", (int)d->location);
    group.writeEntry("activityId", d->activityId);

    group.writeEntry("wallpaperplugin", d->wallpaperPlugin);

    saveContents(group);
}

void Containment::saveContents(KConfigGroup &group) const
{
    KConfigGroup applets(&group, QStringLiteral("Applets"));
    for (const Applet *applet : std::as_const(d->applets)) {
        KConfigGroup appletConfig(&applets, QString::number(applet->id()));
        applet->save(appletConfig);
    }
}

void Containment::restoreContents(KConfigGroup &group)
{
    KConfigGroup applets(&group, QStringLiteral("Applets"));

    // restore the applets ordered by id
    QStringList groups = applets.groupList();
    std::sort(groups.begin(), groups.end());

    // Sort the applet configs in order of geometry to ensure that applets
    // are added from left to right or top to bottom for a panel containment
    QList<KConfigGroup> appletConfigs;
    for (const QString &appletGroup : std::as_const(groups)) {
        // qCDebug(LOG_PLASMA) << "reading from applet group" << appletGroup;
        KConfigGroup appletConfig(&applets, appletGroup);
        appletConfigs.append(appletConfig);
    }
    std::stable_sort(appletConfigs.begin(), appletConfigs.end(), appletConfigLessThan);

    QMutableListIterator<KConfigGroup> it(appletConfigs);
    while (it.hasNext()) {
        KConfigGroup &appletConfig = it.next();
        if (appletConfig.readEntry(QStringLiteral("transient"), false)) {
            appletConfig.deleteGroup();
            continue;
        }
        int appId = appletConfig.name().toUInt();
        QString plugin = appletConfig.readEntry("plugin", QString());

        if (plugin.isEmpty()) {
            continue;
        }

        d->createApplet(plugin, QVariantList(), appId);
    }

    // if there are no applets, none of them is "loading"
    if (Containment::applets().isEmpty()) {
        d->appletsUiReady = true;
    }
    const auto lstApplets = Containment::applets();
    for (Applet *applet : lstApplets) {
        if (!applet->pluginMetaData().isValid()) {
            applet->updateConstraints(UiReadyConstraint);
        }
    }
}

Plasma::Containment::Type Containment::containmentType() const
{
    return d->type;
}

Corona *Containment::corona() const
{
    // We are not sure where the corona parent is in the hyerarchy, because of... the systray.
    // We are iterating over the parent tree here rather than casting the parent
    // to applet then asking ofr its containment and corona, as this might break during
    // teardown, as this can be invoked during dtor of one of the ancestors,
    // see https://bugs.kde.org/show_bug.cgi?id=477067 where it happens during destruction
    // of the panel (containment of the applet that contains the systray containment)
    for (auto candidate = parent(); candidate; candidate = candidate->parent()) {
        if (auto c = qobject_cast<Corona *>(candidate)) {
            return c;
        }
    }

    return nullptr;
}

void Containment::setFormFactor(Types::FormFactor formFactor)
{
    if (d->formFactor == formFactor) {
        return;
    }

    // qCDebug(LOG_PLASMA) << "switching FF to " << formFactor;
    d->formFactor = formFactor;

    updateConstraints(FormFactorConstraint);

    KConfigGroup c = config();
    c.writeEntry("formfactor", (int)formFactor);
    Q_EMIT configNeedsSaving();
    Q_EMIT formFactorChanged(formFactor);
}

void Containment::setContainmentDisplayHints(Types::ContainmentDisplayHints hints)
{
    if (d->containmentDisplayHints == hints) {
        return;
    }

    d->containmentDisplayHints = hints;
    Q_EMIT containmentDisplayHintsChanged(hints);
}

void Containment::setLocation(Types::Location location)
{
    if (d->location == location) {
        return;
    }

    d->location = location;

    for (Applet *applet : std::as_const(d->applets)) {
        applet->updateConstraints(LocationConstraint);
    }

    updateConstraints(LocationConstraint);

    KConfigGroup c = config();
    c.writeEntry("location", (int)location);
    Q_EMIT configNeedsSaving();
    Q_EMIT locationChanged(location);
}

Applet *Containment::createApplet(const QString &name, const QVariantList &args, const QRectF &geometryHint)
{
    Plasma::Applet *applet = d->createApplet(name, args, 0, geometryHint);
    if (applet) {
        Q_EMIT appletCreated(applet, geometryHint);
    }
    return applet;
}

void Containment::addApplet(Applet *applet, const QRectF &geometryHint)
{
    if (!applet) {
#ifndef NDEBUG
        // qCDebug(LOG_PLASMA) << "adding null applet!?!";
#endif
        return;
    }

    if (immutability() != Types::Mutable && !applet->property("org.kde.plasma:force-create").toBool()) {
        return;
    }

#ifndef NDEBUG
    if (d->applets.contains(applet)) {
        // qCDebug(LOG_PLASMA) << "already have this applet!";
    }
#endif

    Containment *currentContainment = applet->containment();

    if (currentContainment && currentContainment != this) {
        Q_EMIT currentContainment->appletAboutToBeRemoved(applet);
        Q_EMIT currentContainment->appletRemoved(applet);
        Q_EMIT appletsChanged();

        disconnect(applet, nullptr, currentContainment, nullptr);
        connect(currentContainment, nullptr, applet, nullptr);
        KConfigGroup oldConfig = applet->config();
        currentContainment->d->applets.removeAll(applet);
        applet->setParent(this);

        // now move the old config to the new location
        // FIXME: this doesn't seem to get the actual main config group containing plugin=, etc
        KConfigGroup c = config().group(QStringLiteral("Applets")).group(QString::number(applet->id()));
        oldConfig.reparent(&c);
        applet->d->resetConfigurationObject();

        disconnect(applet, &Applet::activated, currentContainment, &Applet::activated);
        // change the group to its configloader, if any
        // FIXME: this is very, very brutal
        if (applet->configScheme()) {
            const QString oldGroupPrefix = QStringLiteral("Containments") + QString::number(currentContainment->id()) + QStringLiteral("Applets");
            const QString newGroupPrefix = QStringLiteral("Containments") + QString::number(id()) + QStringLiteral("Applets");

            applet->configScheme()->setCurrentGroup(applet->configScheme()->currentGroup().replace(0, oldGroupPrefix.length(), newGroupPrefix));

            const auto items = applet->configScheme()->items();
            for (KConfigSkeletonItem *item : items) {
                item->setGroup(item->group().replace(0, oldGroupPrefix.length(), newGroupPrefix));
            }
        }
    } else {
        applet->setParent(this);
    }

    // make sure the applets are sorted by id
    const auto position = std::lower_bound(d->applets.begin(), d->applets.end(), applet, [](Plasma::Applet *a1, Plasma::Applet *a2) {
        return a1->id() < a2->id();
    });
    Q_EMIT appletAboutToBeAdded(applet, geometryHint);
    d->applets.insert(position, applet);

    if (!d->uiReady) {
        d->loadingApplets << applet;
    }

    connect(applet, &Applet::configNeedsSaving, this, &Applet::configNeedsSaving);
    connect(applet, SIGNAL(appletDeleted(Plasma::Applet *)), this, SLOT(appletDeleted(Plasma::Applet *)));
    connect(applet, SIGNAL(statusChanged(Plasma::Types::ItemStatus)), this, SLOT(checkStatus(Plasma::Types::ItemStatus)));
    connect(this, &Containment::containmentDisplayHintsChanged, applet, &Applet::containmentDisplayHintsChanged);

    if (!currentContainment) {
        const bool isNew = applet->d->mainConfigGroup()->entryMap().isEmpty();

        if (!isNew) {
            applet->restore(*applet->d->mainConfigGroup());
        }

        applet->init();

        if (isNew) {
            applet->save(*applet->d->mainConfigGroup());
            Q_EMIT configNeedsSaving();
        }
        // FIXME: an on-appear animation would be nice to have again
    }

    applet->updateConstraints(AllConstraints);
    applet->flushPendingConstraintsEvents();

    Q_EMIT appletAdded(applet, geometryHint);
    Q_EMIT appletsChanged();
    Q_EMIT applet->containmentChanged(this);

    if (!currentContainment) {
        applet->updateConstraints(StartupCompletedConstraint);
        applet->flushPendingConstraintsEvents();
    }

    applet->d->scheduleModificationNotification();
}

QList<Applet *> Containment::applets() const
{
    return d->applets;
}

int Containment::screen() const
{
    Q_ASSERT(corona());
    if (Corona *c = corona()) {
        return c->screenForContainment(this);
    } else {
        return -1;
    }
}

int Containment::lastScreen() const
{
    return d->lastScreen;
}

QRectF Containment::availableRelativeScreenRect() const
{
    if (!corona()) {
        return {};
    }

    int screenId = screen();

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

    if (screenId > -1) {
        QRectF rect = corona()->availableScreenRect(screenId);
        // make it relative
        QRectF geometry = corona()->screenGeometry(screenId);
        rect.moveTo(rect.topLeft() - geometry.topLeft());
        return rect;
    }

    return {};
}

QList<QRectF> Containment::availableRelativeScreenRegion() const
{
    QList<QRectF> regVal;

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

    QRegion reg = QRect(QPoint(0, 0), screenGeometry().size().toSize());
    int screenId = screen();
    if (screenId < 0) {
        return {};
    }
    reg = containment()->corona()->availableScreenRegion(screenId);

    auto it = reg.begin();
    const auto itEnd = reg.end();
    QRect geometry = containment()->corona()->screenGeometry(screenId);
    for (; it != itEnd; ++it) {
        QRect rect = *it;
        // make it relative
        rect.moveTo(rect.topLeft() - geometry.topLeft());
        regVal << QRectF(rect);
    }
    return regVal;
}

QRectF Containment::screenGeometry() const
{
    if (!corona() || screen() < 0) {
        return {};
    }

    return corona()->screenGeometry(screen());
}

void Containment::setWallpaperPlugin(const QString &pluginName)
{
    if (pluginName != d->wallpaperPlugin) {
        d->wallpaperPlugin = pluginName;

        KConfigGroup cfg = config();
        cfg.writeEntry("wallpaperplugin", d->wallpaperPlugin);
        Q_EMIT configNeedsSaving();
        Q_EMIT wallpaperPluginChanged();
    }
}

QString Containment::wallpaperPlugin() const
{
    return d->wallpaperPlugin;
}

QObject *Containment::wallpaperGraphicsObject() const
{
    return d->wallpaperGraphicsObject;
}

void Containment::setWallpaperGraphicsObject(QObject *object)
{
    if (d->wallpaperGraphicsObject == object) {
        return;
    }
    d->wallpaperGraphicsObject = object;
    Q_EMIT wallpaperGraphicsObjectChanged();
}

QUrl Containment::compactApplet() const
{
    if (Applet::d->package.isValid()) {
        return Applet::d->package.fileUrl("compactapplet");
    }
    return QUrl();
}

void Containment::setContainmentActions(const QString &trigger, const QString &pluginName)
{
    KConfigGroup cfg = d->containmentActionsConfig();
    ContainmentActions *plugin = nullptr;

    plugin = containmentActions().value(trigger);
    if (plugin && plugin->metadata().pluginId() != pluginName) {
        containmentActions().remove(trigger);
        delete plugin;
        plugin = nullptr;
    }

    if (pluginName.isEmpty()) {
        cfg.deleteEntry(trigger);
    } else if (plugin) {
        // it already existed, just reload config
        plugin->setContainment(this); // to be safe
        // FIXME make a truly unique config group
        KConfigGroup pluginConfig = KConfigGroup(&cfg, trigger);
        plugin->restore(pluginConfig);

    } else {
        plugin = PluginLoader::self()->loadContainmentActions(this, pluginName);

        if (plugin) {
            cfg.writeEntry(trigger, pluginName);
            containmentActions().insert(trigger, plugin);
            plugin->setContainment(this);
            KConfigGroup pluginConfig = KConfigGroup(&cfg, trigger);
            plugin->restore(pluginConfig);
        } else {
            // bad plugin... gets removed. is this a feature or a bug?
            cfg.deleteEntry(trigger);
        }
    }

    Q_EMIT configNeedsSaving();
}

QHash<QString, ContainmentActions *> &Containment::containmentActions()
{
    return d->localActionPlugins;
}

bool Containment::isUiReady() const
{
    return d->uiReady && d->appletsUiReady && Applet::d->started;
}

void Containment::setActivity(const QString &activityId)
{
    if (activityId.isEmpty() || d->activityId == activityId) {
        return;
    }

    d->activityId = activityId;
    KConfigGroup c = config();
    c.writeEntry("activityId", activityId);

    Q_EMIT configNeedsSaving();
    Q_EMIT activityChanged(activityId);
}

QString Containment::activity() const
{
    return d->activityId;
}

QString Containment::activityName() const
{
    if (!d->activityInfo) {
        return QString();
    }
    return d->activityInfo->name();
}

void Containment::reactToScreenChange()
{
    int newScreen = screen();

    Q_EMIT screenChanged(newScreen);

    if (newScreen >= 0) {
        d->lastScreen = newScreen;
        KConfigGroup c = config();
        c.writeEntry("lastScreen", d->lastScreen);
        Q_EMIT configNeedsSaving();

        Q_EMIT availableRelativeScreenRectChanged(availableRelativeScreenRect());
        Q_EMIT screenGeometryChanged(screenGeometry());
        Q_EMIT availableRelativeScreenRegionChanged(availableRelativeScreenRegion());
    }
}

} // Plasma namespace

#include "moc_containment.cpp"