/********************************************************************
 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 "desktopmodel.h"
// tabbox
#include "clientmodel.h"
#include "tabboxconfig.h"
#include "tabboxhandler.h"

#include <math.h>

namespace KWin
{
namespace TabBox
{

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

DesktopModel::~DesktopModel()
    {
    }

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

    int desktopIndex = index.row()*columnCount() + index.column();
    if( desktopIndex >= m_desktopList.count() )
        return QVariant();
    switch( role )
        {
        case Qt::DisplayRole:
        case DesktopNameRole:
            return tabBox->desktopName( m_desktopList[ desktopIndex ] );
        case DesktopRole:
            return m_desktopList[ desktopIndex ];
        case ClientModelRole:
            return qVariantFromValue( (void*)m_clientModels[ m_desktopList[ desktopIndex ] ] );
        default:
            return QVariant();
        }
    }

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

int DesktopModel::rowCount( const QModelIndex& parent ) const
    {
    Q_UNUSED( parent )
    int count = 1;
    switch( tabBox->config().layout() )
        {
        case TabBoxConfig::HorizontalLayout:
            count = 1;
            break;
        case TabBoxConfig::VerticalLayout:
            count = m_desktopList.count();
            break;
        case TabBoxConfig::HorizontalVerticalLayout:
            count = qRound( sqrt( float(m_desktopList.count()) ) );
            // TODO: pager layout?
            break;
        }
    return qMax( count, 1 );
    }

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

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

QModelIndex DesktopModel::desktopIndex( int desktop ) const
    {
    if( desktop > m_desktopList.count() )
        return QModelIndex();
    int index = m_desktopList.indexOf( desktop );
    int row = index / columnCount();
    int column = index % columnCount();
    return createIndex( row, column );
    }

void DesktopModel::createDesktopList()
    {
    m_desktopList.clear();
    qDeleteAll( m_clientModels );
    m_clientModels.clear();

    switch( tabBox->config().desktopSwitchingMode() )
        {
        case TabBoxConfig::MostRecentlyUsedDesktopSwitching:
            {
            int desktop = tabBox->currentDesktop();
            do
                {
                m_desktopList.append( desktop );
                ClientModel* clientModel = new ClientModel( this );
                clientModel->createClientList( desktop );
                m_clientModels.insert( desktop, clientModel );
                desktop = tabBox->nextDesktopFocusChain( desktop );
                } while( desktop != tabBox->currentDesktop() );
            break;
            }
        case TabBoxConfig::StaticDesktopSwitching:
            {
            for( int i=1; i<=tabBox->numberOfDesktops(); i++ )
                {
                m_desktopList.append( i );
                ClientModel* clientModel = new ClientModel( this );
                clientModel->createClientList( i );
                m_clientModels.insert( i, clientModel );
                }
            break;
            }
        }
    reset();
    }

} // namespace Tabbox
} // namespace KWin