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#include "private/qdeclarativepackage_p.h"

#include <private/qobject_p.h>
#include <private/qdeclarativeguard_p.h>

QT_BEGIN_NAMESPACE

/*!
    \qmlclass Package QDeclarativePackage
    \brief Package provides a collection of named items

    The Package class is currently used in conjunction with
    VisualDataModel to enable delegates with a shared context
    to be provided to multiple views.

    Any item within a Package may be assigned a name via the
    \e {Package.name} attached property.

    The example below creates a Package containing two named items;
    \e list and \e grid.  The third element in the package is parented to whichever
    delegate it should appear in.  This allows an item to move
    between views.

    \snippet examples/declarative/package/Delegate.qml 0

    These named items are used as the delegates by the two views who
    reference the special VisualDataModel.parts property to select
    a model which provides the chosen delegate.

    \snippet examples/declarative/package/view.qml 0

*/


class QDeclarativePackagePrivate : public QObjectPrivate
{
public:
    QDeclarativePackagePrivate() {}

    struct DataGuard : public QDeclarativeGuard<QObject>
    {
        DataGuard(QObject *obj, QList<DataGuard> *l) : list(l) { (QDeclarativeGuard<QObject>&)*this = obj; }
        QList<DataGuard> *list;
        void objectDestroyed(QObject *) {
            // we assume priv will always be destroyed after objectDestroyed calls
            list->removeOne(*this);
        }
    };

    QList<DataGuard> dataList;
    static void data_append(QDeclarativeListProperty<QObject> *prop, QObject *o) {
        QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
        list->append(DataGuard(o, list));
    }
    static void data_clear(QDeclarativeListProperty<QObject> *prop) {
        QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
        list->clear();
    }
    static QObject *data_at(QDeclarativeListProperty<QObject> *prop, int index) {
        QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
        return list->at(index);
    }
    static int data_count(QDeclarativeListProperty<QObject> *prop) {
        QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
        return list->count();
    }
};

QHash<QObject *, QDeclarativePackageAttached *> QDeclarativePackageAttached::attached;

QDeclarativePackageAttached::QDeclarativePackageAttached(QObject *parent)
: QObject(parent)
{
    attached.insert(parent, this);
}

QDeclarativePackageAttached::~QDeclarativePackageAttached()
{
    attached.remove(parent());
}

QString QDeclarativePackageAttached::name() const 
{ 
    return _name; 
}

void QDeclarativePackageAttached::setName(const QString &n) 
{ 
    _name = n; 
}

QDeclarativePackage::QDeclarativePackage(QObject *parent)
    : QObject(*(new QDeclarativePackagePrivate), parent)
{
}

QDeclarativePackage::~QDeclarativePackage()
{
    Q_D(QDeclarativePackage);
    for (int ii = 0; ii < d->dataList.count(); ++ii) {
        QObject *obj = d->dataList.at(ii);
        obj->setParent(this);
    }
}

QDeclarativeListProperty<QObject> QDeclarativePackage::data()
{
    Q_D(QDeclarativePackage);
    return QDeclarativeListProperty<QObject>(this, &d->dataList, QDeclarativePackagePrivate::data_append, 
                                                        QDeclarativePackagePrivate::data_count, 
                                                        QDeclarativePackagePrivate::data_at, 
                                                        QDeclarativePackagePrivate::data_clear);
}

bool QDeclarativePackage::hasPart(const QString &name)
{
    Q_D(QDeclarativePackage);
    for (int ii = 0; ii < d->dataList.count(); ++ii) {
        QObject *obj = d->dataList.at(ii);
        QDeclarativePackageAttached *a = QDeclarativePackageAttached::attached.value(obj);
        if (a && a->name() == name)
            return true;
    }
    return false;
}

QObject *QDeclarativePackage::part(const QString &name)
{
    Q_D(QDeclarativePackage);
    if (name.isEmpty() && !d->dataList.isEmpty())
        return d->dataList.at(0);

    for (int ii = 0; ii < d->dataList.count(); ++ii) {
        QObject *obj = d->dataList.at(ii);
        QDeclarativePackageAttached *a = QDeclarativePackageAttached::attached.value(obj);
        if (a && a->name() == name)
            return obj;
    }

    if (name == QLatin1String("default") && !d->dataList.isEmpty())
        return d->dataList.at(0);

    return 0;
}

QDeclarativePackageAttached *QDeclarativePackage::qmlAttachedProperties(QObject *o)
{
    return new QDeclarativePackageAttached(o);
}



QT_END_NAMESPACE