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#ifndef QV4PROPERTYDESCRIPTOR_H
#define QV4PROPERTYDESCRIPTOR_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qv4global_p.h"
#include "qv4value_p.h"

QT_BEGIN_NAMESPACE

namespace QV4 {

struct FunctionObject;

struct Property {
    Value value;
    Value set;

    // Section 8.10
    inline void fullyPopulated(PropertyAttributes *attrs) {
        if (!attrs->hasType()) {
            value = Primitive::undefinedValue();
        }
        if (attrs->type() == PropertyAttributes::Accessor) {
            attrs->clearWritable();
            if (value.isEmpty())
                value = Primitive::undefinedValue();
            if (set.isEmpty())
                set = Primitive::undefinedValue();
        }
        attrs->resolve();
    }

    static Property genericDescriptor() {
        Property pd;
        pd.value = Primitive::emptyValue();
        return pd;
    }

    inline bool isSubset(const PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs) const;
    inline void merge(PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs);

    inline Heap::FunctionObject *getter() const { return reinterpret_cast<Heap::FunctionObject *>(value.heapObject()); }
    inline Heap::FunctionObject *setter() const { return reinterpret_cast<Heap::FunctionObject *>(set.heapObject()); }
    inline void setGetter(FunctionObject *g) { value = reinterpret_cast<Managed *>(g); }
    inline void setSetter(FunctionObject *s) { set = (s ? reinterpret_cast<Managed *>(s) : 0); }

    void copy(const Property *other, PropertyAttributes attrs) {
        value = other->value;
        if (attrs.isAccessor())
            set = other->set;
    }

    explicit Property()  { value = Encode::undefined(); set = Value::fromHeapObject(0); }
    explicit Property(Value v) : value(v) { set = Value::fromHeapObject(0); }
    Property(FunctionObject *getter, FunctionObject *setter) {
        value = reinterpret_cast<Managed *>(getter);
        set = reinterpret_cast<Managed *>(setter);
    }
    Property(Heap::FunctionObject *getter, Heap::FunctionObject *setter) {
        value.setM(reinterpret_cast<Heap::Base *>(getter));
        set.setM(reinterpret_cast<Heap::Base *>(setter));
    }
    Property &operator=(Value v) { value = v; return *this; }
private:
    Property(const Property &);
    Property &operator=(const Property &);
};

inline bool Property::isSubset(const PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs) const
{
    if (attrs.type() != PropertyAttributes::Generic && attrs.type() != otherAttrs.type())
        return false;
    if (attrs.hasEnumerable() && attrs.isEnumerable() != otherAttrs.isEnumerable())
        return false;
    if (attrs.hasConfigurable() && attrs.isConfigurable() != otherAttrs.isConfigurable())
        return false;
    if (attrs.hasWritable() && attrs.isWritable() != otherAttrs.isWritable())
        return false;
    if (attrs.type() == PropertyAttributes::Data && !value.sameValue(other->value))
        return false;
    if (attrs.type() == PropertyAttributes::Accessor) {
        if (value.heapObject() != other->value.heapObject())
            return false;
        if (set.heapObject() != other->set.heapObject())
            return false;
    }
    return true;
}

inline void Property::merge(PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs)
{
    if (otherAttrs.hasEnumerable())
        attrs.setEnumerable(otherAttrs.isEnumerable());
    if (otherAttrs.hasConfigurable())
        attrs.setConfigurable(otherAttrs.isConfigurable());
    if (otherAttrs.hasWritable())
        attrs.setWritable(otherAttrs.isWritable());
    if (otherAttrs.type() == PropertyAttributes::Accessor) {
        attrs.setType(PropertyAttributes::Accessor);
        if (!other->value.isEmpty())
            value = other->value;
        if (!other->set.isEmpty())
            set = other->set;
    } else if (otherAttrs.type() == PropertyAttributes::Data){
        attrs.setType(PropertyAttributes::Data);
        value = other->value;
    }
}

}

Q_DECLARE_TYPEINFO(QV4::Property, Q_MOVABLE_TYPE);

QT_END_NAMESPACE

#endif