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

Copyright (C) 2009 Nikhil Marathe <nsm.nikhil@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 "columns.h"

#include "client.h"
#include "tile.h"

#include "lib/kdecoration.h"

namespace KWin
{

// TODO: caching of actually tiled windows
// Columns is doing a lot of looping
// checking which tiles are actually *tiled*
// ( ie. not floating or minimized )
// This can probably be moved to TilingLayout
// and cached. But remember to preserve order!
  
Columns::Columns( Workspace *w )
    : TilingLayout( w )
    , m_leftWidth( 0 )
    {
    }

KDecorationDefines::Position Columns::resizeMode( Client *c, KDecorationDefines::Position currentMode ) const
    {
    Tile *t = findTile( c );

    if( !t )
        return currentMode;

    if( t && t->floating() )
        return currentMode;

    QList<Tile *> tiled( tiles() );

    QMutableListIterator<Tile *> i(tiled);
    while( i.hasNext() )
        {
        Tile *tile = i.next();
        if( tile->ignoreGeometry() )
            i.remove();
        }

    if(    tiled.first() == t
        && (    currentMode == KDecorationDefines::PositionRight
             || currentMode == KDecorationDefines::PositionTopRight
             || currentMode == KDecorationDefines::PositionBottomRight ) )
        {
        return KDecorationDefines::PositionRight;
        }

    // in right column so only left resize allowed
    if(    tiled.contains( t )
        && ( tiled.first() != t )
        && (    currentMode == KDecorationDefines::PositionLeft
             || currentMode == KDecorationDefines::PositionTopLeft
             || currentMode == KDecorationDefines::PositionBottomLeft ) )
        {
        return KDecorationDefines::PositionLeft;
        }

    return KDecorationDefines::PositionCenter;
    }

void Columns::clientResized( Client *c, const QRect &moveResizeGeom, const QRect &orig )
    {
    TilingLayout::clientResized( c, moveResizeGeom, orig );

    Tile *t = findTile( c );

    QList<Tile *> tiled( tiles() );

    QMutableListIterator<Tile *> i(tiled);
    while( i.hasNext() )
        {
        Tile *tile = i.next();
        if( tile->ignoreGeometry() )
            i.remove();
        }

    if( tiled.first() == t )
        {
        m_leftWidth = moveResizeGeom.width();
        }
    else
        {
        m_leftWidth = layoutArea( t ).width() - moveResizeGeom.width();
        }

    arrange( layoutArea( t ) );
    }

void Columns::arrange( QRect wgeom )
    {
    QList<Tile *> tiled( tiles() );

    QMutableListIterator<Tile *> i(tiled);
    while( i.hasNext() )
        {
        Tile *t = i.next();
        if( t->ignoreGeometry() )
            i.remove();
        }

    int n = tiled.length();
    if( n < 1 )
        return;
    if( n == 1 )
        {
        tiled.first()->setGeometry( wgeom );
        tiled.first()->commit();
        return;
        }

    // save the original before we mangle it
    int totalWidth = wgeom.width();
    if( m_leftWidth == 0 )
        m_leftWidth = wgeom.width() / 2;

    if( n > 1 )
        wgeom.setWidth( m_leftWidth );
    tiled.first()->setGeometry( wgeom );
    tiled.first()->commit();

    wgeom.moveLeft( wgeom.x() + m_leftWidth );
    wgeom.setWidth( totalWidth - m_leftWidth );
    int ht = wgeom.height()/(n-1);
    wgeom.setHeight( ht );

    int mult = 0;
    int originalTop = wgeom.y();
    for( QList<Tile *>::const_iterator it = ++tiled.begin() ; it != tiled.end() ; it++ )
        {
        if( (*it)->floating() )
            continue;
        (*it)->setGeometry( wgeom );
        (*it)->commit();
        mult++;
        wgeom.moveTop( originalTop + mult*ht );
        }
    }
}