/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2009 Martin Gräßlin <kde@martin-graesslin.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/>.
*********************************************************************/

// own
#include "clientmodel.h"
// tabbox
#include "tabboxconfig.h"
#include "tabboxhandler.h"
// Qt
#include <QTextStream>
// KDE
#include <KLocale>
// other
#include <math.h>

namespace KWin
{
namespace TabBox
{

ClientModel::ClientModel( QObject* parent )
    : QAbstractItemModel( parent )
    {
    }

ClientModel::~ClientModel()
    {
    }

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

    if( m_clientList.isEmpty() )
        {
        if( role == EmptyRole )
            return true;
        else
            return i18n("*** No Windows ***");
        }

    int clientIndex = index.row()*columnCount() + index.column();
    if( clientIndex >= m_clientList.count() )
        return QVariant();
    switch( role )
        {
        case Qt::DisplayRole:
        case CaptionRole:
            return m_clientList[ clientIndex ]->caption();
        case ClientRole:
            return qVariantFromValue( (void*)m_clientList[ clientIndex ] );
        case DesktopNameRole:
            {
            return tabBox->desktopName( m_clientList[ clientIndex ] );
            }
        case EmptyRole:
            return false;
        case WIdRole:
            return qulonglong(m_clientList[ clientIndex ]->window());
        case MinimizedRole:
            return m_clientList[ clientIndex ]->isMinimized();
        default:
            return QVariant();
        }
    }

int ClientModel::columnCount( const QModelIndex& parent ) const
    {
    Q_UNUSED( parent )
    int count;
    switch( tabBox->config().layout() )
        {
        case TabBoxConfig::HorizontalLayout:
            count = m_clientList.count();
            break;
        case TabBoxConfig::VerticalLayout:
            count = 1;
            break;
        case TabBoxConfig::HorizontalVerticalLayout:
            count = qRound( sqrt( m_clientList.count() ) );
            if( count * count < m_clientList.count() )
                count++;
            break;
        }
    return qMax( count, 1 );
    }

int ClientModel::rowCount( const QModelIndex& parent ) const
    {
    Q_UNUSED( parent )
    int count;
    switch( tabBox->config().layout() )
        {
        case TabBoxConfig::HorizontalLayout:
            count = 1;
            break;
        case TabBoxConfig::VerticalLayout:
            count = m_clientList.count();
            break;
        case TabBoxConfig::HorizontalVerticalLayout:
            count = qRound( sqrt( m_clientList.count() ) );
            break;
        }
    return qMax( count, 1 );
    }

QModelIndex ClientModel::parent( const QModelIndex& child ) const
    {
    Q_UNUSED( child )
    return QModelIndex();
    }

QModelIndex ClientModel::index( int row, int column, const QModelIndex& parent ) const
    {
    Q_UNUSED( parent )
    int index = row * columnCount() + column;
    if( index >= m_clientList.count() && !m_clientList.isEmpty() )
        return QModelIndex();
    return createIndex( row, column );
    }

QModelIndex ClientModel::index( TabBoxClient* client ) const
    {
    if( !m_clientList.contains( client ) )
        return QModelIndex();
    int index = m_clientList.indexOf( client );
    int row = index / columnCount();
    int column = index % columnCount();
    return createIndex( row, column );
    }

void ClientModel::createClientList( bool partialReset )
    {
    createClientList( tabBox->currentDesktop(), partialReset );
    }

void ClientModel::createClientList( int desktop, bool partialReset )
    {
    reset();
    TabBoxClient* start = tabBox->activeClient();
    // TODO: new clients are not added at correct position
    if( partialReset && !m_clientList.isEmpty() )
        start = m_clientList.first();

    m_clientList.clear();

    switch (tabBox->config().clientSwitchingMode() )
        {
        case TabBoxConfig::FocusChainSwitching:
            {
            TabBoxClient* c = tabBox->nextClientFocusChain( start );
            TabBoxClient* stop = c;
            while ( c )
                {
                TabBoxClient* add = tabBox->clientToAddToList( c, desktop,
                                tabBox->config().clientListMode() == TabBoxConfig::AllDesktopsClientList );
                if( add != NULL )
                    {
                    if ( start == add )
                        {
                        m_clientList.removeAll( add );
                        m_clientList.prepend( add );
                        }
                    else
                        m_clientList += add;
                    }
                c = tabBox->nextClientFocusChain( c );

                if ( c == stop )
                    break;
                }
            break;
            }
        case TabBoxConfig::StackingOrderSwitching:
            {
            // TODO: needs improvement
            TabBoxClientList stacking = tabBox->stackingOrder();
            TabBoxClient* c = stacking.first();
            TabBoxClient* stop = c;
            int index = 0;
            while ( c )
                {
                TabBoxClient* add = tabBox->clientToAddToList( c, desktop,
                                tabBox->config().clientListMode() == TabBoxConfig::AllDesktopsClientList );
                if( add != NULL )
                    {
                    if ( start == add )
                        {
                        m_clientList.removeAll( add );
                        m_clientList.prepend( add );
                        }
                    else
                        m_clientList += add;
                    }
                if( index >= stacking.size() - 1 )
                    {
                    c = NULL;
                    }
                else
                    {
                    c = stacking[++index];
                    }

                if ( c == stop )
                    break;
                }
            break;
            }
        }
    }

} // namespace Tabbox
} // namespace KWin