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#include "qvaluespacemanager_p.h"

QTM_BEGIN_NAMESPACE

Q_GLOBAL_STATIC(QValueSpaceManager, valueSpaceManager);

QValueSpaceManager *QValueSpaceManager::instance()

{

    return valueSpaceManager();

}

QValueSpaceManager::QValueSpaceManager()

: type(Uninit)

{

}

void QValueSpaceManager::initServer()

{

    Q_ASSERT(Uninit == type);

    commonInit(QAbstractValueSpaceLayer::Server);

}

void QValueSpaceManager::init()

{

    if(Uninit != type)

        return; // Already initialized

    commonInit(QAbstractValueSpaceLayer::Client);

}

void QValueSpaceManager::commonInit(QAbstractValueSpaceLayer::Type vsltype)

{

    Q_ASSERT(Uninit == type);

    // Install all the dormant layers

    for(int ii = 0; ii < funcs.count(); ++ii)

        install(funcs[ii]());

    funcs.clear();

    type = (vsltype == QAbstractValueSpaceLayer::Server)?Server:Client;

    for(int ii = 0; ii < layers.count(); ++ii) {

        if(!initLayer(layers.at(ii))) {

            layers.removeAt(ii);

            --ii;

        }

    }

}

bool QValueSpaceManager::isServer() const

{

    return (Server == type);

}

void QValueSpaceManager::install(QAbstractValueSpaceLayer * layer)

{

    Q_ASSERT(Uninit == type);

    Q_ASSERT(layer);

    unsigned int cOrder = layer->order();

    int inserted = -1;

    for(int ii = 0; !inserted && ii < layers.count(); ++ii) {

        unsigned int lOrder = layers.at(ii)->order();

        Q_ASSERT(layer != layers.at(ii));

        if(lOrder < cOrder) {

            // Do nothing

        } else if(lOrder == cOrder) {

            if(layers.at(ii)->id() > layer->id()) {

                layers.insert(ii, layer);

                inserted = ii;

            }

        } else if(lOrder > cOrder) {

            layers.insert(ii, layer);

            inserted = ii;

        }

    }

    if(-1 == inserted) {

        inserted = layers.count();

        layers.append(layer);

    }

}

void QValueSpaceManager::install(QValueSpace::LayerCreateFunc func)

{

    Q_ASSERT(Uninit == type);

    funcs.append(func);

}

QList<QAbstractValueSpaceLayer *> const & QValueSpaceManager::getLayers()

{

    init(); // Fallback init

    return layers;

}

bool QValueSpaceManager::initLayer(QAbstractValueSpaceLayer* layer)

{

    Q_ASSERT(Uninit != type);

    return layer->startup((type==Client)?QAbstractValueSpaceLayer::Client:

                                         QAbstractValueSpaceLayer::Server);

}

QTM_END_NAMESPACE