#include "hbtheme.h"

#include "hbthemecommon_symbian_p.h"

#ifdef Q_OS_SYMBIAN

class Lock

{

public:

    enum State {

        Reserved,

        Acquired,

        Error

    };

    Lock();

    ~Lock(){close();}

    void close(){mFile.Close(); mFs.Close();}

    State acquire();

    static bool serverExists();

private:

    RFs mFs;

    RFile mFile;

};

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) {

            _LIT(KFileName, "lockFile");

            const TUint mode = EFileShareReadersOrWriters;

            if (mFile.Create(mFs, KFileName, mode) == KErrAlreadyExists) {

                mFile.Open(mFs, KFileName, mode);

            }

        }

    }

}

// Try to acquire lock

Lock::State Lock::acquire()

{

    State state = Error;

    // If process holding the lock crashes, file server releases the lock

    if (mFile.SubSessionHandle()) {

        TInt error = mFile.Lock(0, 1);

        if (error == KErrNone) {

            state = Acquired;

        } else if (error == KErrLocked) {

            state = Reserved;

        }

    }

    return state;

}

// Check if Symbian server exists

bool Lock::serverExists()

{

    TFindServer findHbServer(KThemeServerName);

    TFullName name;

    return findHbServer.Next(name) == KErrNone;

}

#endif

#endif // QT_DEBUG

#if QT_VERSION >= 0x040601

    QApplication::setAttribute(Qt::AA_S60DontConstructApplicationPanes);

#endif // QT_VERSION

#ifdef THEME_SERVER_TRACES

        qDebug() << "HbThemeServer::main: START!!!";

#ifdef Q_OS_SYMBIAN

    // Guard against starting multiple copies of the server

    Lock lock;

    Lock::State lockState;

    for(;;) {

        lockState = lock.acquire();

        if (lockState == Lock::Acquired) {

            break;

        } else if (lockState == Lock::Reserved) {

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

            if (Lock::serverExists()) {

#ifdef THEME_SERVER_TRACES

        qDebug() << "HbThemeServer::main: serverExists!!!";

                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 KErrNone;

    }

#endif // Q_OS_SYMBIAN

#ifdef THEME_SERVER_TRACES

        qDebug() << "HbThemeServer::main: start construction QtSingleApplication!!!";

#endif

    QtSingleApplication  app(argc, argv );

    if (app.isRunning()) {

#ifdef THEME_SERVER_TRACES

        qDebug() << "HbThemeServer::main: first instance already running!!!";

#endif

        return 0;

#ifdef THEME_SERVER_TRACES

    qDebug() << "HbThemeServer::main: I'm first instance!!!";

#endif

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

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

        RThread::RenameMe(_L("HbThemeServer"));

#endif

    HbTheme::instance(); //for theme initialization, instance needs to be created before starting the server.

    loadResourceLibrary(RESOURCE_LIB_NAME);

#ifdef HB_DEVELOPER

    loadResourceLibrary(TEST_RESOURCE_LIB_NAME);

#endif

    HbThemeServer server;

    bool success = server.startServer();

    if ( !success ) {

#ifdef THEME_SERVER_TRACES

        qDebug() << "HbThemeServer::main: server not started!!!";

#endif

        return -1;

    }

#ifdef THEME_SERVER_TRACES

    qDebug() << "HbThemeServer::main: server started!!!";

#endif

#ifndef Q_OS_SYMBIAN

#ifdef QT_DEBUG

#endif // Q_OS_SYMBIAN

    int result = app.exec();

#ifdef THEME_SERVER_TRACES

        qDebug() << "HbThemeServer::main: out from exec, with result code: " << result;

#endif

    return result;