/********************************************************************
 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 "tilinglayout.h"

#include <QCursor>

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

namespace KWin
{

TilingLayout::TilingLayout( Workspace *w )
    : m_workspace( w )
    {
    }

TilingLayout::~TilingLayout()
    {
    qDeleteAll( m_tiles );
    m_tiles.clear();
    }

int TilingLayout::findTilePos( Client *c ) const
    {
    int i = 0;
    foreach( Tile *t, m_tiles )
        {
        if( t->client() == c )
            return i;
        i++;
        }
    return -1;
    }

Tile* TilingLayout::findTile( Client *c ) const
    {
    int i = findTilePos( c );
    if( i != -1 )
        return m_tiles[ i ];
    return NULL;
    }

void TilingLayout::clientMinimizeToggled( Client *c )
    {
    // just rearrange since that will check for state
    Tile *t = findTile( c );
    if( t )
        arrange( layoutArea( t ) );
    }

bool TilingLayout::clientResized( Client *c, const QRect &moveResizeGeom, const QRect &orig )
    {
    if( moveResizeGeom == orig )
        return true;

    Tile *t = findTile( c );
    if( !t || t->ignoreGeometry() )
        {
        c->setGeometry( moveResizeGeom );
        return true;
        }

    return false;
    }

// tries to swap the tile with the one in the new position right now
void TilingLayout::clientMoved( Client *c, const QRect &moveResizeGeom, const QRect &orig )
    {
    if( moveResizeGeom == orig )
        return;

    Tile *t = findTile( c );
    if( !t )
        {
        c->setGeometry( moveResizeGeom );
        return;
        }
    if( t->floating() )
        {
        t->setGeometry( moveResizeGeom );
        t->commit();
        return;
        }

    Tile *r = findTileBelowPoint( QCursor::pos() );
    // TODO: if the client moved in from another desktop, don't swap, add
    if( r && t )
        {
        swapTiles( r, t );
        }
    }

void TilingLayout::swapTiles( Tile *a, Tile *b )
    {
    if( a && b )
        {
        // t is the tile the user requested a move of
        // r is the tile below it
        int a_index = tiles().indexOf( a );
        int b_index = tiles().indexOf( b );

        // use m_tiles since tiles() is const
        // not sure how good an idea this is
        m_tiles.replace( a_index, b );
        m_tiles.replace( b_index, a );
        arrange( layoutArea( a ) );
        }
    }

void TilingLayout::addTileNoArrange( Tile * t )
    {
    if( findTile( t->client() ) )
        return;
    m_tiles.append( t );
    postAddTile( t );
    }

void TilingLayout::addTile( Tile *t )
    {
    addTileNoArrange( t );
    arrange( layoutArea( t ) );
    }

void TilingLayout::addTile( Client *c )
    {
    Q_UNUSED( c )
    }

void TilingLayout::removeTileNoArrange( Tile * t )
    {
    if( t == NULL )
        return;
    preRemoveTile( t );
    m_tiles.removeOne( t );
    delete t;
    t = NULL;
    }

const QRect TilingLayout::layoutArea( Tile *t ) const
    {
    return m_workspace->clientArea( PlacementArea, t->client() );
    }

void TilingLayout::removeTile( Tile *t )
    {
        if( t == NULL )
            return;
        removeTileNoArrange( t );
        if( !m_tiles.empty() )
            arrange( layoutArea( m_tiles.first() ) );
    }

void TilingLayout::removeTile( Client *c )
    {
    removeTile( findTile( c ) );
    }

void TilingLayout::toggleFloatTile( Client *c )
    {
    Tile *t = findTile( c );
    if( t && t->floating() )
        t->unfloatTile();
    else if( t )
        t->floatTile();

    if( t )
      arrange( layoutArea( t ) );
    }

void TilingLayout::reconfigureTiling()
    {
      //TODO also check 'untiled' windows to see if they are now requesting tiling
    foreach( Tile *t, tiles() )
        {
        if( t->client()->rules()->checkTilingOption( t->floating() ? 1 : 0 ) == 1 )
            t->floatTile();
        else
            t->unfloatTile();
        }

    if( tiles().length() > 0 )
        arrange( layoutArea( tiles().first() ) );

    foreach( Client *c, workspace()->stackingOrder() )
        {
        if( c->rules()->checkTilingOption( 0 ) == 1 )
            workspace()->createTile( c );
        }

    }

Tile* TilingLayout::findTileBelowPoint( const QPoint &p ) const
    {
    foreach( Tile *t, tiles() )
        {
        if( t->floating() )
            continue;
        if( t->geometry().contains( p ) )
            return t;
        }

    return NULL;
    }

void TilingLayout::commit()
    {
    foreach( Tile *t, m_tiles )
        t->commit();
    }

/*
 * Default is to allow no resizing
 */
KDecorationDefines::Position TilingLayout::resizeMode( Client *c, KDecorationDefines::Position currentMode ) const
    {
    Tile *t = findTile( c );
    // if not tiled, allow resize
    if( !t )
        return currentMode;

    if( t && t->floating() )
        return currentMode;
    // We return PositionCenter since it makes
    // no sense in resizing.
    return KDecorationDefines::PositionCenter;
    }

} // end namespace