/* === This file is part of Calamares - <https://calamares.io> ===
 *
 *   SPDX-FileCopyrightText: 2020 Adriaan de Groot <groot@kde.org>
 *   SPDX-License-Identifier: GPL-3.0-or-later
 *
 *   Calamares is Free Software: see the License-Identifier above.
 *
 */

#include "Config.h"

#include "PlasmaLnfJob.h"

#include "utils/CalamaresUtilsSystem.h"
#include "utils/Logger.h"
#include "utils/Variant.h"

#ifdef WITH_KCONFIG
#include <KConfigGroup>
#include <KSharedConfig>
#endif

#include <KPackage/Package>
#include <KPackage/PackageLoader>

#include <QAbstractListModel>
#include <QList>

class ThemesModel : public QAbstractListModel
{
    Q_OBJECT

public:
    enum
    {
        LabelRole = Qt::DisplayRole,
        KeyRole = Qt::UserRole
    };

    explicit ThemesModel( QObject* parent );

    int rowCount( const QModelIndex& = QModelIndex() ) const override;
    QVariant data( const QModelIndex& index, int role ) const override;

    QHash< int, QByteArray > roleNames() const override;

private:
    QList< KPluginMetaData > m_themes;
};

ThemesModel::ThemesModel( QObject* parent )
    : QAbstractListModel( parent )
    , m_themes( KPackage::PackageLoader::self()->listPackages( "Plasma/LookAndFeel" ) )
{
}

int
ThemesModel::rowCount( const QModelIndex& ) const
{
    return m_themes.count();
}

QVariant
ThemesModel::data( const QModelIndex& index, int role ) const
{
    if ( !index.isValid() )
    {
        return QVariant();
    }
    if ( index.row() < 0 || index.row() >= m_themes.count() )
    {
        return QVariant();
    }

    const auto& item = m_themes.at( index.row() );
    switch ( role )
    {
    case LabelRole:
        return item.name();
    case KeyRole:
        return item.pluginId();
    default:
        return QVariant();
    }
    __builtin_unreachable();
}

QHash< int, QByteArray >
ThemesModel::roleNames() const
{
    return { { LabelRole, "label" }, { KeyRole, "key" } };
}


static QString
currentPlasmaTheme()
{
#ifdef WITH_KCONFIG
    KConfigGroup cg( KSharedConfig::openConfig( QStringLiteral( "kdeglobals" ) ), "KDE" );
    return cg.readEntry( "LookAndFeelPackage", QString() );
#else
    cWarning() << "No KConfig support, cannot determine Plasma theme.";
    return QString();
#endif
}


Config::Config( QObject* parent )
    : QObject( parent )
    , m_themeModel( new ThemesModel( this ) )
{
}

void
Config::setConfigurationMap( const QVariantMap& configurationMap )
{
    m_lnfPath = CalamaresUtils::getString( configurationMap, "lnftool" );

    if ( m_lnfPath.isEmpty() )
    {
        cWarning() << "no lnftool given for plasmalnf module.";
    }

    m_liveUser = CalamaresUtils::getString( configurationMap, "liveuser" );

    QString preselect = CalamaresUtils::getString( configurationMap, "preselect" );
    if ( preselect == QStringLiteral( "*" ) )
    {
        preselect = currentPlasmaTheme();
    }
    m_preselectThemeId = preselect;
}

Calamares::JobList
Config::createJobs() const
{
    Calamares::JobList l;

    cDebug() << "Creating Plasma LNF jobs ..";
    if ( !theme().isEmpty() )
    {
        if ( !lnfToolPath().isEmpty() )
        {
            l.append( Calamares::job_ptr( new PlasmaLnfJob( lnfToolPath(), theme() ) ) );
        }
        else
        {
            cWarning() << "no lnftool given for plasmalnf module.";
        }
    }
    return l;
}


void
Config::setTheme( const QString& id )
{
    if ( m_themeId == id )
    {
        return;
    }

    m_themeId = id;
    if ( lnfToolPath().isEmpty() )
    {
        cWarning() << "no lnftool given for plasmalnf module.";
    }
    else
    {
        QStringList command;
        if ( !m_liveUser.isEmpty() )
        {
            command << "sudo"
                    << "-E"
                    << "-H"
                    << "-u" << m_liveUser;
        }
        command << lnfToolPath() << "--resetLayout"
                << "--apply" << id;
        auto r = CalamaresUtils::System::instance()->runCommand( command, std::chrono::seconds( 10 ) );

        if ( r.getExitCode() )
        {
            cWarning() << r.explainProcess( command, std::chrono::seconds( 10 ) );
        }
        else
        {
            cDebug() << "Plasma look-and-feel applied" << id;
        }
    }
    emit themeChanged( id );
}

#include "utils/moc-warnings.h"

#include "Config.moc"