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

Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>

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 "sm.h"

#include <unistd.h>
#include <stdlib.h>
#include <pwd.h>
#include <fixx11h.h>
#include <kconfig.h>
#include <kglobal.h>

#include "workspace.h"
#include "client.h"
#include <QDBusInterface>
#include <QSocketNotifier>
#include <QSessionManager>
#include <kdebug.h>

namespace KWin
{

bool SessionManager::saveState( QSessionManager& sm )
    {
    // If the session manager is ksmserver, save stacking
    // order, active window, active desktop etc. in phase 1,
    // as ksmserver assures no interaction will be done
    // before the WM finishes phase 1. Saving in phase 2 is
    // too late, as possible user interaction may change some things.
    // Phase2 is still needed though (ICCCM 5.2)
    char* sm_vendor = SmcVendor( static_cast< SmcConn >( sm.handle()));
    bool ksmserver = qstrcmp( sm_vendor, "KDE" ) == 0;
    free( sm_vendor );
    if ( !sm.isPhase2() )
        {
        Workspace::self()->sessionSaveStarted();
        if( ksmserver ) // save stacking order etc. before "save file?" etc. dialogs change it
            Workspace::self()->storeSession( kapp->sessionConfig(), SMSavePhase0 );
        sm.release(); // Qt doesn't automatically release in this case (bug?)
        sm.requestPhase2();
        return true;
        }
    Workspace::self()->storeSession( kapp->sessionConfig(), ksmserver ? SMSavePhase2 : SMSavePhase2Full );
    kapp->sessionConfig()->sync();
    return true;
    }

// I bet this is broken, just like everywhere else in KDE
bool SessionManager::commitData( QSessionManager& sm )
    {
    if ( !sm.isPhase2() )
        Workspace::self()->sessionSaveStarted();
    return true;
    }

// Workspace

/*!
  Stores the current session in the config file

  \sa loadSessionInfo()
 */
void Workspace::storeSession( KConfig* config, SMSavePhase phase )
    {
    KConfigGroup cg(config, "Session");
    int count =  0;
    int active_client = -1;

    if( phase == SMSavePhase2 || phase == SMSavePhase2Full )
        {
        cg.writeEntry( "tiling", tilingEnabled() );
        if( tilingEnabled() )
            {
            kDebug(1212) << "Tiling was ON";
            setTilingEnabled( false );
            }
        }

    for (ClientList::Iterator it = clients.begin(); it != clients.end(); ++it) 
        {
        Client* c = (*it);
        QByteArray sessionId = c->sessionId();
        QByteArray wmCommand = c->wmCommand();
        if ( sessionId.isEmpty() )
	    // remember also applications that are not XSMP capable
	    // and use the obsolete WM_COMMAND / WM_SAVE_YOURSELF
            if ( wmCommand.isEmpty() )
                continue;
        count++;
        if( c->isActive())
            active_client = count;
        if( phase == SMSavePhase2 || phase == SMSavePhase2Full )
            storeClient(cg, count, c);
        }
    if( phase == SMSavePhase0 )
        {
        // it would be much simpler to save these values to the config file,
        // but both Qt and KDE treat phase1 and phase2 separately,
        // which results in different sessionkey and different config file :(
        session_active_client = active_client;
        session_desktop = currentDesktop();
        }
    else if( phase == SMSavePhase2 )
        {
        cg.writeEntry( "count", count );
        cg.writeEntry( "active", session_active_client );
        cg.writeEntry( "desktop", session_desktop );
        }
    else // SMSavePhase2Full
        {
        cg.writeEntry( "count", count );
        cg.writeEntry( "active", session_active_client );
        cg.writeEntry( "desktop", currentDesktop());
        }
    }

void Workspace::storeClient( KConfigGroup &cg, int num, Client *c )
    {
    c->setSessionInteract(false); //make sure we get the real values
    QString n = QString::number(num);
    cg.writeEntry( QString("sessionId")+n, c->sessionId().constData() );
    cg.writeEntry( QString("windowRole")+n, c->windowRole().constData() );
    cg.writeEntry( QString("wmCommand")+n, c->wmCommand().constData() );
    cg.writeEntry( QString("wmClientMachine")+n, c->wmClientMachine( true ).constData() );
    cg.writeEntry( QString("resourceName")+n, c->resourceName().constData() );
    cg.writeEntry( QString("resourceClass")+n, c->resourceClass().constData() );
    cg.writeEntry( QString("geometry")+n, QRect( c->calculateGravitation(true), c->clientSize() ) ); // FRAME
    cg.writeEntry( QString("restore")+n, c->geometryRestore() );
    cg.writeEntry( QString("fsrestore")+n, c->geometryFSRestore() );
    cg.writeEntry( QString("maximize")+n, (int) c->maximizeMode() );
    cg.writeEntry( QString("fullscreen")+n, (int) c->fullScreenMode() );
    cg.writeEntry( QString("desktop")+n, c->desktop() );
    // the config entry is called "iconified" for back. comp. reasons
    // (kconf_update script for updating session files would be too complicated)
    cg.writeEntry( QString("iconified")+n, c->isMinimized() );
    cg.writeEntry( QString("opacity")+n, c->opacity() );
    // the config entry is called "sticky" for back. comp. reasons
    cg.writeEntry( QString("sticky")+n, c->isOnAllDesktops() );
    cg.writeEntry( QString("shaded")+n, c->isShade() );
    // the config entry is called "staysOnTop" for back. comp. reasons
    cg.writeEntry( QString("staysOnTop")+n, c->keepAbove() );
    cg.writeEntry( QString("keepBelow")+n, c->keepBelow() );
    cg.writeEntry( QString("skipTaskbar")+n, c->skipTaskbar( true ) );
    cg.writeEntry( QString("skipPager")+n, c->skipPager() );
    cg.writeEntry( QString("skipSwitcher")+n, c->skipSwitcher() );
    // not really just set by user, but name kept for back. comp. reasons
    cg.writeEntry( QString("userNoBorder")+n, c->noBorder() );
    cg.writeEntry( QString("windowType")+n, windowTypeToTxt( c->windowType()));
    cg.writeEntry( QString("shortcut")+n, c->shortcut().toString());
    cg.writeEntry( QString("stackingOrder")+n, unconstrained_stacking_order.indexOf( c ));
    int group = 0;
    if( c->clientGroup() )
        group = c->clientGroup()->clients().count() > 1 ?
        // KConfig doesn't support long so we need to live with less precision on 64-bit systems
        static_cast<int>( reinterpret_cast<long>( c->clientGroup() )) : 0;
    cg.writeEntry( QString("clientGroup")+n, group );
    cg.writeEntry( QString("activities")+n, c->activities() );
    }

void Workspace::storeSubSession(const QString &name, QSet<QByteArray> sessionIds)
    {
    //TODO clear it first
    KConfigGroup cg(KGlobal::config(), QString("SubSession: ") + name);
    int count =  0;
    int active_client = -1;
    for (ClientList::Iterator it = clients.begin(); it != clients.end(); ++it) 
        {
        Client* c = (*it);
        QByteArray sessionId = c->sessionId();
        QByteArray wmCommand = c->wmCommand();
        if ( sessionId.isEmpty() )
        // remember also applications that are not XSMP capable
        // and use the obsolete WM_COMMAND / WM_SAVE_YOURSELF
            if ( wmCommand.isEmpty() )
                continue;
        if (!sessionIds.contains(sessionId))
            continue;

        kDebug() << "storing" << sessionId;
        count++;
        if( c->isActive())
            active_client = count;
        storeClient(cg, count, c);
        }
    cg.writeEntry( "count", count );
    cg.writeEntry( "active", active_client );
    //cg.writeEntry( "desktop", currentDesktop());
    }

bool Workspace::stopActivity(const QString &id)
{
    if (sessionSaving()) {
        return false; //ksmserver doesn't queue requests (yet)
        //FIXME what about session *loading*?
    }
    //ugly hack to avoid dbus deadlocks
    QMetaObject::invokeMethod(this, "reallyStopActivity", Qt::QueuedConnection, Q_ARG(QString, id));
    //then lie and assume it worked.
    return true;
}

void Workspace::reallyStopActivity(const QString &id)
    {
    QStringList openActivities = openActivityList();

    QSet<QByteArray> saveSessionIds;
    QSet<QByteArray> dontCloseSessionIds;
    kDebug() << id;
    for (ClientList::Iterator it = clients.begin(); it != clients.end(); ++it) 
        {
        Client* c = (*it);
        QByteArray sessionId = c->sessionId();
        if ( sessionId.isEmpty() )
            continue; //TODO support old wm_command apps too?

        kDebug() << sessionId;

        //if it's on the activity that's closing, it needs saving
        //but if a process is on some other open activity, I don't wanna close it yet
        //this is, of course, complicated by a process having many windows.
        if (c->isOnAllActivities())
            {
            dontCloseSessionIds << sessionId;
            continue;
            }
        QStringList activities = c->activities();
        foreach (const QString &activityId, activities)
            {
            if (activityId == id)
                saveSessionIds << sessionId;
            else if (openActivities.contains(activityId))
                dontCloseSessionIds << sessionId;
            }
        }

    storeSubSession(id, saveSessionIds);

    QStringList saveAndClose;
    QStringList saveOnly;
    foreach (const QByteArray &sessionId, saveSessionIds)
        {
        if (dontCloseSessionIds.contains(sessionId))
            saveOnly << sessionId;
        else
            saveAndClose << sessionId;
        }

    kDebug() << "saveActivity" << id << saveAndClose << saveOnly;

    //pass off to ksmserver
    QDBusInterface ksmserver("org.kde.ksmserver", "/KSMServer", "org.kde.KSMServerInterface");
    if (ksmserver.isValid())
        {
        QDBusMessage reply = ksmserver.call("saveSubSession", id, saveAndClose, saveOnly);
        if (reply.type() == QDBusMessage::ErrorMessage)
            kDebug() << "dbus error:" << reply.errorMessage();
        else
            kDebug() << "dbus succeeded";
        }
    else
        kDebug() << "couldn't get ksmserver interface";
    }

/*!
  Loads the session information from the config file.

  \sa storeSession()
 */
void Workspace::loadSessionInfo()
    {
    session.clear();
    KConfigGroup cg(kapp->sessionConfig(), "Session");

    setTilingEnabled( cg.readEntry( "tiling", false ) );

    addSessionInfo(cg);
    }

void Workspace::addSessionInfo(KConfigGroup &cg)
    {
    int count =  cg.readEntry( "count",0 );
    int active_client = cg.readEntry( "active",0 );
    for ( int i = 1; i <= count; i++ ) 
        {
        QString n = QString::number(i);
        SessionInfo* info = new SessionInfo;
        session.append( info );
        info->sessionId = cg.readEntry( QString("sessionId")+n, QString() ).toLatin1();
        info->windowRole = cg.readEntry( QString("windowRole")+n, QString() ).toLatin1();
        info->wmCommand = cg.readEntry( QString("wmCommand")+n, QString() ).toLatin1();
        info->wmClientMachine = cg.readEntry( QString("wmClientMachine")+n, QString() ).toLatin1();
        info->resourceName = cg.readEntry( QString("resourceName")+n, QString() ).toLatin1();
        info->resourceClass = cg.readEntry( QString("resourceClass")+n, QString() ).toLower().toLatin1();
        info->geometry = cg.readEntry( QString("geometry")+n,QRect() );
        info->restore = cg.readEntry( QString("restore")+n,QRect() );
        info->fsrestore = cg.readEntry( QString("fsrestore")+n,QRect() );
        info->maximized = cg.readEntry( QString("maximize")+n, 0 );
        info->fullscreen = cg.readEntry( QString("fullscreen")+n, 0 );
        info->desktop = cg.readEntry( QString("desktop")+n, 0 );
        info->minimized = cg.readEntry( QString("iconified")+n, false );
        info->opacity = cg.readEntry( QString("opacity")+n, 1.0 );
        info->onAllDesktops = cg.readEntry( QString("sticky")+n, false );
        info->shaded = cg.readEntry( QString("shaded")+n, false );
        info->keepAbove = cg.readEntry( QString("staysOnTop")+n, false  );
        info->keepBelow = cg.readEntry( QString("keepBelow")+n, false  );
        info->skipTaskbar = cg.readEntry( QString("skipTaskbar")+n, false  );
        info->skipPager = cg.readEntry( QString("skipPager")+n, false  );
        info->skipSwitcher = cg.readEntry( QString("skipSwitcher")+n, false  );
        info->noBorder = cg.readEntry( QString("userNoBorder")+n, false  );
        info->windowType = txtToWindowType( cg.readEntry( QString("windowType")+n, QString() ).toLatin1());
        info->shortcut = cg.readEntry( QString("shortcut")+n, QString() );
        info->active = ( active_client == i );
        info->stackingOrder = cg.readEntry( QString("stackingOrder")+n, -1 );
        info->clientGroup = cg.readEntry( QString("clientGroup")+n, 0 );
        info->clientGroupClient = NULL;
        info->activities = cg.readEntry( QString("activities")+n, QStringList() );
        }
    }

void Workspace::loadSubSessionInfo(const QString &name)
    {
    KConfigGroup cg(KGlobal::config(), QString("SubSession: ") + name);
    addSessionInfo(cg);
    }

bool Workspace::startActivity(const QString &id)
{
    if (sessionSaving()) {
        return false; //ksmserver doesn't queue requests (yet)
    }
    if (!allActivities_.contains(id)) {
        return false; //bogus id
    }

    loadSubSessionInfo(id);

    QDBusInterface ksmserver("org.kde.ksmserver", "/KSMServer", "org.kde.KSMServerInterface");
    if (ksmserver.isValid()) {
        QDBusMessage reply = ksmserver.call("restoreSubSession", id);
        if (reply.type() == QDBusMessage::ErrorMessage) {
            kDebug() << "dbus error:" << reply.errorMessage();
            return false;
        }
    } else {
        kDebug() << "couldn't get ksmserver interface";
        return false;
    }
    return true;
}

/*!
  Returns a SessionInfo for client \a c. The returned session
  info is removed from the storage. It's up to the caller to delete it.

  This function is called when a new window is mapped and must be managed.
  We try to find a matching entry in the session.

  May return 0 if there's no session info for the client.
 */
SessionInfo* Workspace::takeSessionInfo( Client* c )
    {
    SessionInfo *realInfo = 0;
    QByteArray sessionId = c->sessionId();
    QByteArray windowRole = c->windowRole();
    QByteArray wmCommand = c->wmCommand();
    QByteArray wmClientMachine = c->wmClientMachine( true );
    QByteArray resourceName = c->resourceName();
    QByteArray resourceClass = c->resourceClass();

    // First search ``session''
    if (! sessionId.isEmpty() ) 
        {
        // look for a real session managed client (algorithm suggested by ICCCM)
        foreach( SessionInfo* info, session )
            {
            if( realInfo )
                break;
            if( info->sessionId == sessionId && sessionInfoWindowTypeMatch( c, info )) 
                {
                if( ! windowRole.isEmpty() ) 
                    {
                    if( info->windowRole == windowRole )
                        {
                        realInfo = info;
                        session.removeAll(info);
                        }
                    }
                else 
                    {
                    if( info->windowRole.isEmpty()
                        && info->resourceName == resourceName
                        && info->resourceClass == resourceClass )
                        {
                        realInfo = info;
                        session.removeAll(info);
                        }
                    }
                }
            }
        }
    else 
        {
        // look for a sessioninfo with matching features.
        foreach( SessionInfo* info, session )
            {
            if( realInfo )
                break;
            if( info->resourceName == resourceName
                && info->resourceClass == resourceClass
                && info->wmClientMachine == wmClientMachine
                && sessionInfoWindowTypeMatch( c, info ))
                {
                if ( wmCommand.isEmpty() || info->wmCommand == wmCommand )
                    {
                    realInfo = info;
                    session.removeAll( info );
                    }
                }
            }
        }

    // Set clientGroupClient for other clients in the same group
    if( realInfo && realInfo->clientGroup )
        foreach( SessionInfo* info, session )
            if( !info->clientGroupClient && info->clientGroup == realInfo->clientGroup )
                info->clientGroupClient = c;

    return realInfo;
    }

bool Workspace::sessionInfoWindowTypeMatch( Client* c, SessionInfo* info )
    {
    if( info->windowType == -2 ) 
        { // undefined (not really part of NET::WindowType)
        return !c->isSpecialWindow();
        }
    return info->windowType == c->windowType();
    }

static const char* const window_type_names[] = 
    {
    "Unknown", "Normal" , "Desktop", "Dock", "Toolbar", "Menu", "Dialog",
    "Override", "TopMenu", "Utility", "Splash"
    };
    // change also the two functions below when adding new entries

const char* Workspace::windowTypeToTxt( NET::WindowType type )
    {
    if( type >= NET::Unknown && type <= NET::Splash )
        return window_type_names[ type + 1 ]; // +1 (unknown==-1)
    if( type == -2 ) // undefined (not really part of NET::WindowType)
        return "Undefined";
    kFatal(1212) << "Unknown Window Type" ;
    return NULL;
    }

NET::WindowType Workspace::txtToWindowType( const char* txt )
    {
    for( int i = NET::Unknown;
         i <= NET::Splash;
         ++i )
        if( qstrcmp( txt, window_type_names[ i + 1 ] ) == 0 ) // +1
            return static_cast< NET::WindowType >( i );
    return static_cast< NET::WindowType >( -2 ); // undefined
    }




// KWin's focus stealing prevention causes problems with user interaction
// during session save, as it prevents possible dialogs from getting focus.
// Therefore it's temporarily disabled during session saving. Start of
// session saving can be detected in SessionManager::saveState() above,
// but Qt doesn't have API for saying when session saved finished (either
// successfully, or was canceled). Therefore, create another connection
// to session manager, that will provide this information.
// Similarly the remember feature of window-specific settings should be disabled
// during KDE shutdown when windows may move e.g. because of Kicker going away
// (struts changing). When session saving starts, it can be cancelled, in which
// case the shutdown_cancelled callback is invoked, or it's a checkpoint that
// is immediatelly followed by save_complete, or finally it's a shutdown that
// is immediatelly followed by die callback. So getting save_yourself with shutdown
// set disables window-specific settings remembering, getting shutdown_cancelled
// re-enables, otherwise KWin will go away after die.
static void save_yourself( SmcConn conn_P, SmPointer ptr, int, Bool shutdown, int, Bool )
    {
    SessionSaveDoneHelper* session = reinterpret_cast< SessionSaveDoneHelper* >( ptr );
    if( conn_P != session->connection())
        return;
    if( shutdown )
        Workspace::self()->disableRulesUpdates( true );
    SmcSaveYourselfDone( conn_P, True );
    }

static void die( SmcConn conn_P, SmPointer ptr )
    {
    SessionSaveDoneHelper* session = reinterpret_cast< SessionSaveDoneHelper* >( ptr );
    if( conn_P != session->connection())
        return;
    // session->saveDone(); we will quit anyway
    session->close();
    }

static void save_complete( SmcConn conn_P, SmPointer ptr )
    {
    SessionSaveDoneHelper* session = reinterpret_cast< SessionSaveDoneHelper* >( ptr );
    if( conn_P != session->connection())
        return;
    session->saveDone();
    }

static void shutdown_cancelled( SmcConn conn_P, SmPointer ptr )
    {
    SessionSaveDoneHelper* session = reinterpret_cast< SessionSaveDoneHelper* >( ptr );
    if( conn_P != session->connection())
        return;
    Workspace::self()->disableRulesUpdates( false ); // re-enable
    // no need to differentiate between successful finish and cancel
    session->saveDone();
    }

void SessionSaveDoneHelper::saveDone()
    {
    Workspace::self()->sessionSaveDone();
    }

SessionSaveDoneHelper::SessionSaveDoneHelper()
    {
    SmcCallbacks calls;
    calls.save_yourself.callback = save_yourself;
    calls.save_yourself.client_data = reinterpret_cast< SmPointer >(this);
    calls.die.callback = die;
    calls.die.client_data = reinterpret_cast< SmPointer >(this);
    calls.save_complete.callback = save_complete;
    calls.save_complete.client_data = reinterpret_cast< SmPointer >(this);
    calls.shutdown_cancelled.callback = shutdown_cancelled;
    calls.shutdown_cancelled.client_data = reinterpret_cast< SmPointer >(this);
    char* id = NULL;
    char err[ 11 ];
    conn = SmcOpenConnection( NULL, 0, 1, 0,
        SmcSaveYourselfProcMask | SmcDieProcMask | SmcSaveCompleteProcMask
        | SmcShutdownCancelledProcMask, &calls, NULL, &id, 10, err );
    if( id != NULL )
        free( id );
    if( conn == NULL )
        return; // no SM
    // set the required properties, mostly dummy values
    SmPropValue propvalue[ 5 ];
    SmProp props[ 5 ];
    propvalue[ 0 ].length = sizeof( unsigned char);
    unsigned char value0 = SmRestartNever; // so that this extra SM connection doesn't interfere
    propvalue[ 0 ].value = &value0;
    props[ 0 ].name = const_cast< char* >( SmRestartStyleHint );
    props[ 0 ].type = const_cast< char* >( SmCARD8 );
    props[ 0 ].num_vals = 1;
    props[ 0 ].vals = &propvalue[ 0 ];
    struct passwd* entry = getpwuid( geteuid() );
    propvalue[ 1 ].length = entry != NULL ? strlen( entry->pw_name ) : 0;
    propvalue[ 1 ].value = (SmPointer)( entry != NULL ? entry->pw_name : "" );
    props[ 1 ].name = const_cast< char* >( SmUserID );
    props[ 1 ].type = const_cast< char* >( SmARRAY8 );
    props[ 1 ].num_vals = 1;
    props[ 1 ].vals = &propvalue[ 1 ];
    propvalue[ 2 ].length = 0;
    propvalue[ 2 ].value = (SmPointer)( "" );
    props[ 2 ].name = const_cast< char* >( SmRestartCommand );
    props[ 2 ].type = const_cast< char* >( SmLISTofARRAY8 );
    props[ 2 ].num_vals = 1;
    props[ 2 ].vals = &propvalue[ 2 ];
    propvalue[ 3 ].length = strlen( "kwinsmhelper" );
    propvalue[ 3 ].value = (SmPointer)"kwinsmhelper";
    props[ 3 ].name = const_cast< char* >( SmProgram );
    props[ 3 ].type = const_cast< char* >( SmARRAY8 );
    props[ 3 ].num_vals = 1;
    props[ 3 ].vals = &propvalue[ 3 ];
    propvalue[ 4 ].length = 0;
    propvalue[ 4 ].value = (SmPointer)( "" );
    props[ 4 ].name = const_cast< char* >( SmCloneCommand );
    props[ 4 ].type = const_cast< char* >( SmLISTofARRAY8 );
    props[ 4 ].num_vals = 1;
    props[ 4 ].vals = &propvalue[ 4 ];
    SmProp* p[ 5 ] = { &props[ 0 ], &props[ 1 ], &props[ 2 ], &props[ 3 ], &props[ 4 ] };
    SmcSetProperties( conn, 5, p );
    notifier = new QSocketNotifier( IceConnectionNumber( SmcGetIceConnection( conn )),
        QSocketNotifier::Read, this );
    connect( notifier, SIGNAL( activated( int )), SLOT( processData()));
    }

SessionSaveDoneHelper::~SessionSaveDoneHelper()
    {
    close();
    }

void SessionSaveDoneHelper::close()
    {
    if( conn != NULL )
        {
        delete notifier;
        SmcCloseConnection( conn, 0, NULL );
        }
    conn = NULL;
    }

void SessionSaveDoneHelper::processData()
    {
    if( conn != NULL )
        IceProcessMessages( SmcGetIceConnection( conn ), 0, 0 );
    }

void Workspace::sessionSaveDone()
{
    session_saving = false;
    //remove sessionInteract flag from all clients
    foreach( Client* c, clients ) {
        c->setSessionInteract(false);
    }
}

} // namespace

#include "sm.moc"
