/* === This file is part of Calamares - <https://github.com/calamares> ===
 *
 *   Copyright (c) 2017, Kyle Robbertze <kyle@aims.ac.za>
 *   Copyright 2017-2018, Adriaan de Groot <groot@kde.org>
 *
 *   Calamares 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 3 of the License, or
 *   (at your option) any later version.
 *
 *   Calamares 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 Calamares. If not, see <http://www.gnu.org/licenses/>.
 */

#include "PackageModel.h"

#include "utils/Yaml.h"

PackageModel::PackageModel( const YAML::Node& data, QObject* parent )
    : QAbstractItemModel( parent )
{
    m_rootItem = new PackageTreeItem();
    setupModelData( data, m_rootItem );
}

PackageModel::~PackageModel()
{
    delete m_rootItem;
}

QModelIndex
PackageModel::index( int row, int column, const QModelIndex& parent ) const
{
    if ( !hasIndex( row, column, parent ) )
    {
        return QModelIndex();
    }

    PackageTreeItem* parentItem;

    if ( !parent.isValid() )
    {
        parentItem = m_rootItem;
    }
    else
    {
        parentItem = static_cast< PackageTreeItem* >( parent.internalPointer() );
    }

    PackageTreeItem* childItem = parentItem->child( row );
    if ( childItem )
    {
        return createIndex( row, column, childItem );
    }
    else
    {
        return QModelIndex();
    }
}

QModelIndex
PackageModel::parent( const QModelIndex& index ) const
{
    if ( !index.isValid() )
    {
        return QModelIndex();
    }

    PackageTreeItem* child = static_cast< PackageTreeItem* >( index.internalPointer() );
    PackageTreeItem* parent = child->parentItem();

    if ( parent == m_rootItem )
    {
        return QModelIndex();
    }
    return createIndex( parent->row(), 0, parent );
}

int
PackageModel::rowCount( const QModelIndex& parent ) const
{
    if ( parent.column() > 0 )
    {
        return 0;
    }

    PackageTreeItem* parentItem;
    if ( !parent.isValid() )
    {
        parentItem = m_rootItem;
    }
    else
    {
        parentItem = static_cast< PackageTreeItem* >( parent.internalPointer() );
    }

    return parentItem->childCount();
}

int
PackageModel::columnCount( const QModelIndex& ) const
{
    return 2;
}

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

    PackageTreeItem* item = static_cast< PackageTreeItem* >( index.internalPointer() );
    if ( index.column() == NameColumn && role == Qt::CheckStateRole )
    {
        return item->isSelected();
    }

    if ( item->isHidden() && role == Qt::DisplayRole )  // Hidden group
    {
        return QVariant();
    }

    if ( role == Qt::DisplayRole )
    {
        return item->data( index.column() );
    }
    return QVariant();
}

bool
PackageModel::setData( const QModelIndex& index, const QVariant& value, int role )
{
    if ( role == Qt::CheckStateRole && index.isValid() )
    {
        PackageTreeItem* item = static_cast< PackageTreeItem* >( index.internalPointer() );
        item->setSelected( static_cast< Qt::CheckState >( value.toInt() ) );

        emit dataChanged( this->index( 0, 0 ),
                          index.sibling( index.column(), index.row() + 1 ),
                          QVector< int >( Qt::CheckStateRole ) );
    }
    return true;
}

Qt::ItemFlags
PackageModel::flags( const QModelIndex& index ) const
{
    if ( !index.isValid() )
    {
        return Qt::ItemFlags();
    }
    if ( index.column() == NameColumn )
    {
        return Qt::ItemIsUserCheckable | QAbstractItemModel::flags( index );
    }
    return QAbstractItemModel::flags( index );
}

QVariant
PackageModel::headerData( int section, Qt::Orientation orientation, int role ) const
{
    if ( orientation == Qt::Horizontal && role == Qt::DisplayRole )
    {
        return ( section == NameColumn ) ? tr( "Name" ) : tr( "Description" );
    }
    return QVariant();
}

QList< PackageTreeItem::ItemData >
PackageModel::getPackages() const
{
    QList< PackageTreeItem* > items = getItemPackages( m_rootItem );
    for ( auto package : m_hiddenItems )
        if ( package->hiddenSelected() )
        {
            items.append( getItemPackages( package ) );
        }
    QList< PackageTreeItem::ItemData > packages;
    for ( auto item : items )
    {
        PackageTreeItem::ItemData itemData;
        itemData.preScript = item->parentItem()->preScript();  // Only groups have hooks
        itemData.packageName = item->packageName();  // this seg faults
        itemData.postScript = item->parentItem()->postScript();  // Only groups have hooks
        itemData.isCritical = item->parentItem()->isCritical();  // Only groups are critical
        packages.append( itemData );
    }
    return packages;
}

QList< PackageTreeItem* >
PackageModel::getItemPackages( PackageTreeItem* item ) const
{
    QList< PackageTreeItem* > selectedPackages;
    for ( int i = 0; i < item->childCount(); i++ )
    {
        if ( item->child( i )->isSelected() == Qt::Unchecked )
        {
            continue;
        }

        if ( !item->child( i )->childCount() )  // package
        {
            selectedPackages.append( item->child( i ) );
        }
        else
        {
            selectedPackages.append( getItemPackages( item->child( i ) ) );
        }
    }
    return selectedPackages;
}

void
PackageModel::setupModelData( const YAML::Node& data, PackageTreeItem* parent )
{
    for ( YAML::const_iterator it = data.begin(); it != data.end(); ++it )
    {
        const YAML::Node itemDefinition = *it;

        QString name( tr( CalamaresUtils::yamlToVariant( itemDefinition[ "name" ] ).toByteArray() ) );
        QString description( tr( CalamaresUtils::yamlToVariant( itemDefinition[ "description" ] ).toByteArray() ) );

        PackageTreeItem::ItemData itemData;
        itemData.name = name;
        itemData.description = description;

        if ( itemDefinition[ "pre-install" ] )
        {
            itemData.preScript = CalamaresUtils::yamlToVariant( itemDefinition[ "pre-install" ] ).toString();
        }
        if ( itemDefinition[ "post-install" ] )
        {
            itemData.postScript = CalamaresUtils::yamlToVariant( itemDefinition[ "post-install" ] ).toString();
        }
        PackageTreeItem* item = new PackageTreeItem( itemData, parent );

        if ( itemDefinition[ "selected" ] )
            item->setSelected( CalamaresUtils::yamlToVariant( itemDefinition[ "selected" ] ).toBool() ? Qt::Checked
                                                                                                      : Qt::Unchecked );
        else
        {
            item->setSelected( parent->isSelected() );  // Inherit from it's parent
        }

        if ( itemDefinition[ "hidden" ] )
        {
            item->setHidden( CalamaresUtils::yamlToVariant( itemDefinition[ "hidden" ] ).toBool() );
        }

        if ( itemDefinition[ "critical" ] )
        {
            item->setCritical( CalamaresUtils::yamlToVariant( itemDefinition[ "critical" ] ).toBool() );
        }

        if ( itemDefinition[ "packages" ] )
            for ( YAML::const_iterator packageIt = itemDefinition[ "packages" ].begin();
                  packageIt != itemDefinition[ "packages" ].end();
                  ++packageIt )
                item->appendChild(
                    new PackageTreeItem( CalamaresUtils::yamlToVariant( *packageIt ).toString(), item ) );

        if ( itemDefinition[ "subgroups" ] )
        {
            setupModelData( itemDefinition[ "subgroups" ], item );
        }

        if ( item->isHidden() )
        {
            m_hiddenItems.append( item );
        }
        else
        {
            item->setCheckable( true );
            parent->appendChild( item );
        }
    }
}