/**************************************************************************
* KWin - the KDE window manager                                          *
* This file is part of the KDE project.                                  *
*                                                                        *
* Copyright (C) 2013 Antonis Tsiapaliokas <kok3rs@gmail.com>             *
*                                                                        *
* This program is free software; you can redistribute it and/or modify   *
* it under the terms of the GNU General Public License as published by   *
* the Free Software Foundation; either version 2 of the License, or      *
* (at your option) any later version.                                    *
*                                                                        *
* This program 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 General Public License for more details.                           *
*                                                                        *
* You should have received a copy of the GNU General Public License      *
* along with this program.  If not, see <http://www.gnu.org/licenses/>.  *
**************************************************************************/

#include "model.h"
#include "effectconfig.h"
#include "compositing.h"
#include <kwin_effects_interface.h>

#include <KPluginInfo>
#include <KService>
#include <KServiceTypeTrader>
#include <KSharedConfig>
#include <KCModuleProxy>

#include <QAbstractItemModel>
#include <QDBusConnection>
#include <QDBusInterface>
#include <QDBusPendingCall>
#include <QDBusMessage>
#include <QHash>
#include <QVariant>
#include <QList>
#include <QString>
#include <QQmlEngine>
#include <QtQml>
#include <QQuickItem>
#include <QDebug>

namespace KWin {
namespace Compositing {

EffectModel::EffectModel(QObject *parent)
    : QAbstractItemModel(parent) {

    loadEffects();
}

QHash< int, QByteArray > EffectModel::roleNames() const
{
    QHash<int, QByteArray> roleNames;
    roleNames[NameRole] = "NameRole";
    roleNames[DescriptionRole] = "DescriptionRole";
    roleNames[AuthorNameRole] = "AuthorNameRole";
    roleNames[AuthorEmailRole] = "AuthorEmailRole";
    roleNames[LicenseRole] = "LicenseRole";
    roleNames[VersionRole] = "VersionRole";
    roleNames[CategoryRole] = "CategoryRole";
    roleNames[ServiceNameRole] = "ServiceNameRole";
    roleNames[EffectStatusRole] = "EffectStatusRole";
    roleNames[VideoRole] = "VideoRole";
    roleNames[SupportedRole] = "SupportedRole";
    roleNames[ExclusiveRole] = "ExclusiveRole";
    return roleNames;
}

QModelIndex EffectModel::index(int row, int column, const QModelIndex &parent) const
{
if (parent.isValid() || column > 0 || column < 0 || row < 0 || row >= m_effectsList.count()) {
        return QModelIndex();
    }

    return createIndex(row, column);
}

QModelIndex EffectModel::parent(const QModelIndex &child) const
{
    Q_UNUSED(child)

    return QModelIndex();
}

int EffectModel::columnCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent)
    return 1;
}

int EffectModel::rowCount(const QModelIndex &parent) const
{
    if (parent.isValid()) {
        return 0;
    }
    return m_effectsList.count();
}

QVariant EffectModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid()) {
        return QVariant();
    }

    EffectData currentEffect = m_effectsList.at(index.row());
    switch (role) {
        case Qt::DisplayRole:
        case NameRole:
            return m_effectsList.at(index.row()).name;
        case DescriptionRole:
            return m_effectsList.at(index.row()).description;
        case AuthorNameRole:
            return m_effectsList.at(index.row()).authorName;
        case AuthorEmailRole:
            return m_effectsList.at(index.row()).authorEmail;
        case LicenseRole:
            return m_effectsList.at(index.row()).license;
        case VersionRole:
            return m_effectsList.at(index.row()).version;
        case CategoryRole:
            return m_effectsList.at(index.row()).category;
        case ServiceNameRole:
            return m_effectsList.at(index.row()).serviceName;
        case EffectStatusRole:
            return m_effectsList.at(index.row()).effectStatus;
        case VideoRole:
            return m_effectsList.at(index.row()).video;
        case SupportedRole:
            return m_effectsList.at(index.row()).supported;
        case ExclusiveRole:
            return m_effectsList.at(index.row()).exclusiveGroup;
        default:
            return QVariant();
    }
}

bool EffectModel::setData(const QModelIndex& index, const QVariant& value, int role)
{
    if (!index.isValid())
        return QAbstractItemModel::setData(index, value, role);

    if (role == EffectModel::EffectStatusRole) {
        EffectData &data = m_effectsList[index.row()];
        data.effectStatus = value.toBool();
        emit dataChanged(index, index);

        if (data.effectStatus && !data.exclusiveGroup.isEmpty()) {
            // need to disable all other exclusive effects in the same category
            for (int i = 0; i < m_effectsList.size(); ++i) {
                if (i == index.row()) {
                    continue;
                }
                EffectData &otherData = m_effectsList[i];
                if (otherData.exclusiveGroup == data.exclusiveGroup) {
                    otherData.effectStatus = false;
                    emit dataChanged(this->index(i, 0), this->index(i, 0));
                }
            }
        }

        return true;
    } else if (role == EffectModel::WindowManagementRole) {
        bool enabled = value.toBool();
        handleWindowManagement(index.row(), enabled);
        emit dataChanged(index, index);
        return true;
    }

    return QAbstractItemModel::setData(index, value, role);
}

void EffectModel::loadEffects()
{
    EffectData effect;
    KConfigGroup kwinConfig(KSharedConfig::openConfig("kwinrc"), "Plugins");

    beginResetModel();
    m_effectsChanged.clear();
    m_effectsList.clear();
    KService::List offers = KServiceTypeTrader::self()->query("KWin/Effect");
    for(KService::Ptr service : offers) {
        const QString effectPluginPath = QStandardPaths::locate(QStandardPaths::GenericDataLocation, "kde5/services/"+ service->entryPath(), QStandardPaths::LocateFile);
        KPluginInfo plugin(effectPluginPath);

        effect.name = plugin.name();
        effect.description = plugin.comment();
        effect.authorName = plugin.author();
        effect.authorEmail = plugin.email();
        effect.license = plugin.license();
        effect.version = plugin.version();
        effect.category = plugin.category();
        effect.serviceName = plugin.pluginName();
        effect.effectStatus = kwinConfig.readEntry(effect.serviceName + "Enabled", plugin.isPluginEnabledByDefault());
        effect.enabledByDefault = plugin.isPluginEnabledByDefault();
        effect.video = service->property(QStringLiteral("X-KWin-Video-Url"), QVariant::Url).toUrl();
        effect.supported = true;
        effect.exclusiveGroup = service->property(QStringLiteral("X-KWin-Exclusive-Category"), QVariant::String).toString();

        m_effectsList << effect;
    }

    qSort(m_effectsList.begin(), m_effectsList.end(), [](const EffectData &a, const EffectData &b) {
        if (a.category == b.category) {
            if (a.exclusiveGroup == b.exclusiveGroup) {
                return a.name < b.name;
            }
            return a.exclusiveGroup < b.exclusiveGroup;
        }
        return a.category < b.category;
    });

    OrgKdeKwinEffectsInterface interface(QStringLiteral("org.kde.KWin"),
                                             QStringLiteral("/Effects"),
                                             QDBusConnection::sessionBus());
    if (interface.isValid()) {
        QStringList effectNames;
        std::for_each(m_effectsList.constBegin(), m_effectsList.constEnd(), [&effectNames](const EffectData &data) {
            effectNames << data.serviceName;
        });
        QDBusPendingCallWatcher *watcher = new QDBusPendingCallWatcher(interface.areEffectsSupported(effectNames), this);
        watcher->setProperty("effectNames", effectNames);
        connect(watcher, &QDBusPendingCallWatcher::finished, [this](QDBusPendingCallWatcher *self) {
            const QStringList effectNames = self->property("effectNames").toStringList();
            const QDBusPendingReply< QList< bool > > reply = *self;
            QList< bool> supportValues;
            if (reply.isValid()) {
                supportValues.append(reply.value());
            }
            if (effectNames.size() == supportValues.size()) {
                for (int i = 0; i < effectNames.size(); ++i) {
                    const bool supportedValue = supportValues.at(i);
                    const QString &effectName = effectNames.at(i);
                    auto it = std::find_if(m_effectsList.begin(), m_effectsList.end(), [effectName](const EffectData &data) {
                        return data.serviceName == effectName;
                    });
                    if (it != m_effectsList.end()) {
                        if ((*it).supported != supportedValue) {
                            (*it).supported = supportedValue;
                            QModelIndex i = index(findRowByServiceName(effectName), 0);
                            if (i.isValid()) {
                                emit dataChanged(i, i, QVector<int>() << SupportedRole);
                            }
                        }
                    }
                }
            }
            self->deleteLater();
        });
    }

    m_effectsChanged = m_effectsList;
    endResetModel();
}

void EffectModel::handleWindowManagement(int row, bool enabled)
{
    //Make sure that our row is valid
    if (m_effectsList.size() > 0 && row <= m_effectsList.size())
        m_effectsList[row].effectStatus = enabled;
}

int EffectModel::findRowByServiceName(const QString &serviceName)
{
    for (int it = 0; it < m_effectsList.size(); it++) {
        if (m_effectsList.at(it).serviceName == serviceName) {
            return it;
        }
    }
    return -1;
}

void EffectModel::syncEffectsToKWin()
{
    OrgKdeKwinEffectsInterface interface(QStringLiteral("org.kde.KWin"),
                                             QStringLiteral("/Effects"),
                                             QDBusConnection::sessionBus());
    for (int it = 0; it < m_effectsList.size(); it++) {
        if (m_effectsList.at(it).effectStatus != m_effectsChanged.at(it).effectStatus) {
            if (m_effectsList.at(it).effectStatus) {
                interface.loadEffect(m_effectsList.at(it).serviceName);
            } else {
                interface.unloadEffect(m_effectsList.at(it).serviceName);
            }
        }
    }

    m_effectsChanged = m_effectsList;
}

void EffectModel::updateEffectStatus(const QModelIndex &rowIndex, bool effectState)
{
    setData(rowIndex, effectState, EffectModel::EffectStatusRole);
}

void EffectModel::syncConfig()
{
    KConfigGroup kwinConfig(KSharedConfig::openConfig("kwinrc"), "Plugins");

    for (auto it = m_effectsList.begin(); it != m_effectsList.end(); it++) {
        EffectData effect = *(it);

        bool effectConfigStatus = kwinConfig.readEntry(effect.serviceName + "Enabled", false);

        if (effect.effectStatus) {
            kwinConfig.writeEntry(effect.serviceName + "Enabled", effect.effectStatus);
        } else if (effect.effectStatus != effectConfigStatus) {
            kwinConfig.writeEntry(effect.serviceName + "Enabled", effect.effectStatus);
        }
    }

    kwinConfig.sync();
    syncEffectsToKWin();
}

void EffectModel::defaults()
{
    for (int i = 0; i < m_effectsList.count(); ++i) {
        const auto &effect = m_effectsList.at(i);
        if (effect.effectStatus != effect.enabledByDefault) {
            updateEffectStatus(index(i, 0), effect.enabledByDefault);
        }
    }
}

EffectFilterModel::EffectFilterModel(QObject *parent)
    : QSortFilterProxyModel(parent)
    , m_effectModel(new EffectModel(this))
    , m_supported(true)
{
    setSourceModel(m_effectModel);
}

const QString &EffectFilterModel::filter() const
{
    return m_filter;
}

void EffectFilterModel::setFilter(const QString &filter)
{
    if (filter == m_filter) {
        return;
    }

    m_filter = filter;
    emit filterChanged();
    invalidateFilter();
}

void EffectFilterModel::setFilterOnSupported(bool supported)
{
    if (m_supported == supported) {
        return;
    }

    m_supported = supported;
    emit filterOnSupportedChanged();
    invalidateFilter();
}

bool EffectFilterModel::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
{
    if (!m_effectModel) {
        return false;
    }

    QModelIndex index = m_effectModel->index(source_row, 0, source_parent);
    if (!index.isValid()) {
        return false;
    }

    if (m_supported) {
        bool supported = index.data(EffectModel::SupportedRole).toBool();
        if (!supported) {
            return false;
        }
    }

    if (m_filter.isEmpty()) {
        return true;
    }

    QVariant data = index.data();
    if (!data.isValid()) {
        //An invalid QVariant is valid data
        return true;
    }

    if (m_effectModel->data(index, EffectModel::NameRole).toString().contains(m_filter, Qt::CaseInsensitive)) {
        return true;
    } else if (m_effectModel->data(index, EffectModel::DescriptionRole).toString().contains(m_filter, Qt::CaseInsensitive)) {
        return true;
    }
    if (index.data(EffectModel::CategoryRole).toString().contains(m_filter, Qt::CaseInsensitive)) {
        return true;
    }

    return false;
}

void EffectFilterModel::updateEffectStatus(int rowIndex, bool effectState)
{
    const QModelIndex sourceIndex = mapToSource(index(rowIndex, 0));

    m_effectModel->updateEffectStatus(sourceIndex, effectState);
}

void EffectFilterModel::syncConfig()
{
    m_effectModel->syncConfig();
}

void EffectFilterModel::load()
{
    m_effectModel->loadEffects();
}

void EffectFilterModel::defaults()
{
    m_effectModel->defaults();
}

EffectView::EffectView(ViewType type, QWindow *parent)
    : QQuickView(parent)
{
    qmlRegisterType<EffectConfig>("org.kde.kwin.kwincompositing", 1, 0, "EffectConfig");
    qmlRegisterType<EffectFilterModel>("org.kde.kwin.kwincompositing", 1, 0, "EffectFilterModel");
    qmlRegisterType<Compositing>("org.kde.kwin.kwincompositing", 1, 0, "Compositing");
    qmlRegisterType<CompositingType>("org.kde.kwin.kwincompositing", 1, 0, "CompositingType");
    init(type);
}

void EffectView::init(ViewType type)
{
    QString path;
    switch (type) {
    case CompositingSettingsView:
        path = QStringLiteral("kwincompositing/qml/main-compositing.qml");
        break;
    case DesktopEffectsView:
        path = QStringLiteral("kwincompositing/qml/main.qml");
        break;
    }
    QString mainFile = QStandardPaths::locate(QStandardPaths::GenericDataLocation, path, QStandardPaths::LocateFile);
    setResizeMode(QQuickView::SizeRootObjectToView);
    rootContext()->setContextProperty("engine", this);
    setSource(QUrl(mainFile));
    connect(rootObject(), SIGNAL(changed()), this, SIGNAL(changed()));
}

void EffectView::save()
{
    if (auto *model = rootObject()->findChild<EffectFilterModel*>(QStringLiteral("filterModel"))) {
        model->syncConfig();
    }
    if (auto *compositing = rootObject()->findChild<Compositing*>(QStringLiteral("compositing"))) {
        compositing->save();
    }
}

void EffectView::load()
{
    if (auto *model = rootObject()->findChild<EffectFilterModel*>(QStringLiteral("filterModel"))) {
        model->load();
    }
    if (auto *compositing = rootObject()->findChild<Compositing*>(QStringLiteral("compositing"))) {
        compositing->reset();
    }
}

void EffectView::defaults()
{
    if (auto *model = rootObject()->findChild<EffectFilterModel*>(QStringLiteral("filterModel"))) {
        model->defaults();
    }
    if (auto *compositing = rootObject()->findChild<Compositing*>(QStringLiteral("compositing"))) {
        compositing->defaults();
    }
}

}//end namespace Compositing
}//end namespace KWin