/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbServers module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbthemeserverapplication_p.h"

#include "hbthemeserver_p.h"

#include "hbthemecommon_p.h"

#include "hbtheme.h"

#include <QWindowsStyle>

#include <QLibrary>

#include <QDebug>

#include <QDir>

#include "hbthemecommon_symbian_p.h"

#include <eikenv.h>

#include <apgwgnam.h>

static const QLatin1String APP_NAME("HbThemeServer");

static const QLatin1String RESOURCE_LIB_NAME("HbCore");

static const QLatin1String TEST_RESOURCE_LIB_NAME("HbTestResources");

HbThemeServerApplication::HbThemeServerApplication(int &argc, char *argv[]) :

    QtSingleApplication(argc, argv), server(0)

{

    setApplicationName(APP_NAME);

#ifdef QT_DEBUG

    //temporary solution until Hb specific style is ready

    setStyle(new QWindowsStyle);

#endif // QT_DEBUG

}

HbThemeServerApplication::~HbThemeServerApplication()

{

    delete server;

}

bool HbThemeServerApplication::initialize()

{

    CEikonEnv * env = CEikonEnv::Static();

    if ( env ) {

        _LIT(KHbThemeServer, "HbThemeServer");

        CApaWindowGroupName *wgName = CApaWindowGroupName::NewLC(env->WsSession());

        env->RootWin().SetOrdinalPosition(0, ECoeWinPriorityNeverAtFront); // avoid coming to foreground

        env->WsSession().ComputeMode(RWsSession::EPriorityControlDisabled);

        setPriority();

        wgName->SetHidden(ETrue); // hides us from FSW and protects us from OOM FW etc.

        wgName->SetSystem(ETrue); // Allow only application with PowerManagement cap to shut us down    

        wgName->SetCaptionL(KHbThemeServer);

        wgName->SetAppUid(KNullUid);

        wgName->SetWindowGroupName(env->RootWin());

        CleanupStack::PopAndDestroy();

        RThread::RenameMe(KHbThemeServer);

        User::SetProcessCritical(User::ESystemCritical);

        User::SetCritical(User::ESystemCritical);

    }

    // load resource libraries in order to make binary resources accessible

    bool result = loadLibrary(RESOURCE_LIB_NAME);

#ifdef HB_DEVELOPER

    loadLibrary(TEST_RESOURCE_LIB_NAME);

#endif

    return result;

}

int HbThemeServerApplication::exec()

{

    if (!server) {

        server = new HbThemeServer;

    }

    if (server->startServer()) {

        return QtSingleApplication::exec();

    }

    return EXIT_FAILURE;

}

bool HbThemeServerApplication::loadLibrary(const QString &name)

{

    QLibrary library(name);

    // rely on dynamic loader (LD_LIBRARY_PATH)

    bool result = library.load();

    if (!result) {

        // try from prefix/lib dir

        library.setFileName(QDir(HB_LIB_DIR).filePath(name));

        result = library.load();

        if (!result) {

            // try from build/lib dir

            QString path = QLatin1String(HB_BUILD_DIR) + QDir::separator() + QLatin1String("lib");

            library.setFileName(QDir(path).filePath(name));

            result = library.load();

        }

    }

#ifdef THEME_SERVER_TRACES

    if (!result) {

        qDebug() << "loadLibrary():" << library.errorString();

    }

#endif

    return result;

}

bool HbThemeServerLocker::lock()

{

    Lock::State lockState;

    Q_FOREVER {

        lockState = mLock.acquire();

        if (lockState == Lock::Reserved) {

            // Process may be starting, wait for server object to be created

            if (serverExists()) {

#ifdef THEME_SERVER_TRACES

                qDebug() << "HbThemeServerLocker::lock: serverExists";

#endif

                break;

            } else {

                const TInt KTimeout = 100000; // 100 ms

                User::After(KTimeout);

            }

        } else {

            break;

        }

    }

    if (lockState != Lock::Acquired) {

        // With KErrAlreadyExists client should try to connect, otherwise bail out.

#ifdef THEME_SERVER_TRACES

        qDebug() << "HbThemeServer::main: Lock not acquired!!!";

#endif

        RProcess::Rendezvous(lockState == Lock::Reserved ? KErrAlreadyExists : KErrGeneral);

    }

    return (lockState == Lock::Acquired);

}

void HbThemeServerApplication::setPriority()

{

    RProcess().SetPriority(EPriorityHigh);

}

_LIT(KLockFileName, "lockFile");

Lock::Lock()

{

    // Using a file for interprocess lock

    const int NumMessageSlots = 1;

    if (mFs.Connect(NumMessageSlots) == KErrNone) {

        mFs.CreatePrivatePath(EDriveC);

        if (mFs.SetSessionToPrivate(EDriveC) == KErrNone) {

            RFile file;

            file.Create(mFs, KLockFileName, EFileShareReadersOrWriters);

            file.Close();

        }

    }

}

// Try to acquire lock

Lock::State Lock::acquire()

{

    State state = Error;

    TInt status = mFile.Open(mFs, KLockFileName, EFileShareExclusive);

    if (status == KErrNone) {

        state = Acquired;

    } else if (status == KErrInUse) {

        state = Reserved;

    }

    return state;

}

// Check if Symbian server exists

bool HbThemeServerLocker::serverExists()

{

    TFindServer findHbServer(KThemeServerName);

    TFullName name;

    return findHbServer.Next(name) == KErrNone;

}