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#include "qmlboundsignal_p.h"
#include "private/qmetaobjectbuilder_p.h"
#include "private/qmlengine_p.h"
#include "private/qmlcontext_p.h"
#include <qfxglobal.h>
#include <qmlmetatype.h>
#include <qml.h>
#include <qmlcontext.h>
#include <QDebug>

QT_BEGIN_NAMESPACE

int QmlBoundSignal::evaluateIdx = -1;
QmlBoundSignal::QmlBoundSignal(QmlContext *ctxt, const QString &val, QObject *me, int idx, QObject *parent)
: QmlExpression(ctxt, val, me), _idx(idx)
{
    // A cached evaluation of the QmlExpression::value() slot index.
    //
    // This is thread safe.  Although it may be updated by two threads, they
    // will both set it to the same value - so the worst thing that can happen
    // is that they both do the work to figure it out.  Boo hoo.
    if (evaluateIdx == -1) evaluateIdx = QmlExpression::staticMetaObject.indexOfMethod("value()");

    setTrackChange(false);
    QFx_setParent_noEvent(this, parent);
    QMetaObject::connect(me, _idx, this, evaluateIdx);
}

QmlBoundSignalProxy::QmlBoundSignalProxy(QmlContext *ctxt, const QString &val, QObject *me, int idx, QObject *parent)
: QmlBoundSignal(ctxt, val, me, idx, parent) 
{
    QMetaMethod signal = me->metaObject()->method(idx);

    params = new QmlBoundSignalParameters(signal, this);

    ctxt->d_func()->addDefaultObject(params, QmlContextPrivate::HighPriority);
}

int QmlBoundSignalProxy::qt_metacall(QMetaObject::Call c, int id, void **a)
{
    if (c == QMetaObject::InvokeMetaMethod && id == evaluateIdx) {
        params->setValues(a);
        value();
        params->clearValues();
        return -1;
    } else {
        return QmlBoundSignal::qt_metacall(c, id, a);
    }
}

QmlBoundSignalParameters::QmlBoundSignalParameters(const QMetaMethod &method, 
                                                   QObject *parent)
: QObject(parent), types(0), values(0)
{
    MetaObject *mo = new MetaObject(this);

    // ### Optimize!
    // ### Ensure only supported types are allowed, otherwise it might crash
    QMetaObjectBuilder mob;
    mob.setSuperClass(&QmlBoundSignalParameters::staticMetaObject);
    mob.setClassName("QmlBoundSignalParameters");

    QList<QByteArray> paramTypes = method.parameterTypes();
    QList<QByteArray> paramNames = method.parameterNames();
    types = new int[paramTypes.count()];
    for (int ii = 0; ii < paramTypes.count(); ++ii) {
        const QByteArray &type = paramTypes.at(ii);
        const QByteArray &name = paramNames.at(ii);

        if (name.isEmpty() || type.isEmpty()) {
            types[ii] = 0;
            continue;
        }

        QVariant::Type t = (QVariant::Type)QMetaType::type(type.constData());
        if (QmlMetaType::isObject(t)) {
            types[ii] = QMetaType::QObjectStar;
            QMetaPropertyBuilder prop = mob.addProperty(name, "QObject*");
            prop.setWritable(false);
        } else {
            types[ii] = t;
            QMetaPropertyBuilder prop = mob.addProperty(name, type);
            prop.setWritable(false);
        }
    }
    myMetaObject = mob.toMetaObject();
    *static_cast<QMetaObject *>(mo) = *myMetaObject;

    d_ptr->metaObject = mo;
}

QmlBoundSignalParameters::~QmlBoundSignalParameters()
{
    delete [] types;
    qFree(myMetaObject);
}

void QmlBoundSignalParameters::setValues(void **v)
{
    values = v;
}

void QmlBoundSignalParameters::clearValues()
{
    values = 0;
}

int QmlBoundSignalParameters::metaCall(QMetaObject::Call c, int id, void **a)
{
    if (c == QMetaObject::ReadProperty && id >= 1) {
        QmlMetaType::copy(types[id - 1], a[0], values[id]);
        return -1;
    } else {
        return qt_metacall(c, id, a);
    }
}

QT_END_NAMESPACE