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#include <qv4argumentsobject_p.h>
#include <qv4alloca_p.h>
#include <qv4scopedvalue_p.h>
#include <qv4string_p.h>
#include <qv4function_p.h>

using namespace QV4;

DEFINE_OBJECT_VTABLE(ArgumentsObject);

void Heap::ArgumentsObject::init(QV4::CallContext *context)
{
    Object::init();
    fullyCreated = false;
    this->context = context->d();
    Q_ASSERT(vtable() == QV4::ArgumentsObject::staticVTable());

    ExecutionEngine *v4 = context->d()->engine;
    Scope scope(v4);
    Scoped<QV4::ArgumentsObject> args(scope, this);

    if (context->d()->strictMode) {
        Q_ASSERT(CalleePropertyIndex == args->internalClass()->find(context->d()->engine->id_callee()));
        Q_ASSERT(CallerPropertyIndex == args->internalClass()->find(context->d()->engine->id_caller()));
        *args->propertyData(CalleePropertyIndex + QV4::Object::GetterOffset) = v4->thrower();
        *args->propertyData(CalleePropertyIndex + QV4::Object::SetterOffset) = v4->thrower();
        *args->propertyData(CallerPropertyIndex + QV4::Object::GetterOffset) = v4->thrower();
        *args->propertyData(CallerPropertyIndex + QV4::Object::SetterOffset) = v4->thrower();

        args->arrayReserve(context->argc());
        args->arrayPut(0, context->args(), context->argc());
        args->d()->fullyCreated = true;
    } else {
        Q_ASSERT(CalleePropertyIndex == args->internalClass()->find(context->d()->engine->id_callee()));
        *args->propertyData(CalleePropertyIndex) = context->d()->function->asReturnedValue();
    }
    Q_ASSERT(LengthPropertyIndex == args->internalClass()->find(context->d()->engine->id_length()));
    *args->propertyData(LengthPropertyIndex) = Primitive::fromInt32(context->d()->callData->argc);
}

void ArgumentsObject::fullyCreate()
{
    if (fullyCreated())
        return;

    uint argCount = context()->callData->argc;
    uint numAccessors = qMin(context()->formalParameterCount(), argCount);
    ArrayData::realloc(this, Heap::ArrayData::Sparse, argCount, true);
    context()->engine->requireArgumentsAccessors(numAccessors);

    Scope scope(engine());
    Scoped<MemberData> md(scope, d()->mappedArguments);
    if (numAccessors) {
        d()->mappedArguments = md->allocate(engine(), numAccessors);
        for (uint i = 0; i < numAccessors; ++i) {
            d()->mappedArguments->data[i] = context()->callData->args[i];
            arraySet(i, context()->engine->argumentsAccessors + i, Attr_Accessor);
        }
    }
    arrayPut(numAccessors, context()->callData->args + numAccessors, argCount - numAccessors);
    for (uint i = numAccessors; i < argCount; ++i)
        setArrayAttributes(i, Attr_Data);

    d()->fullyCreated = true;
}

bool ArgumentsObject::defineOwnProperty(ExecutionEngine *engine, uint index, const Property *desc, PropertyAttributes attrs)
{
    fullyCreate();

    Scope scope(engine);
    Property *pd = arrayData() ? arrayData()->getProperty(index) : 0;
    ScopedProperty map(scope);
    PropertyAttributes mapAttrs;
    bool isMapped = false;
    uint numAccessors = qMin((int)context()->formalParameterCount(), context()->callData->argc);
    if (pd && index < (uint)numAccessors)
        isMapped = arrayData()->attributes(index).isAccessor() &&
                pd->getter() == context()->engine->argumentsAccessors[index].getter();

    if (isMapped) {
        Q_ASSERT(arrayData());
        mapAttrs = arrayData()->attributes(index);
        map->copy(pd, mapAttrs);
        setArrayAttributes(index, Attr_Data);
        pd = arrayData()->getProperty(index);
        pd->value = d()->mappedArguments->data[index];
    }

    bool strict = engine->current->strictMode;
    engine->current->strictMode = false;
    bool result = Object::defineOwnProperty2(scope.engine, index, desc, attrs);
    engine->current->strictMode = strict;

    if (isMapped && attrs.isData()) {
        Q_ASSERT(arrayData());
        ScopedFunctionObject setter(scope, map->setter());
        ScopedCallData callData(scope, 1);
        callData->thisObject = this->asReturnedValue();
        callData->args[0] = desc->value;
        setter->call(scope, callData);

        if (attrs.isWritable()) {
            setArrayAttributes(index, mapAttrs);
            pd = arrayData()->getProperty(index);
            pd->copy(map, mapAttrs);
        }
    }

    if (engine->current->strictMode && !result)
        return engine->throwTypeError();
    return result;
}

ReturnedValue ArgumentsObject::getIndexed(const Managed *m, uint index, bool *hasProperty)
{
    const ArgumentsObject *args = static_cast<const ArgumentsObject *>(m);
    if (args->fullyCreated())
        return Object::getIndexed(m, index, hasProperty);

    if (index < static_cast<uint>(args->context()->callData->argc)) {
        if (hasProperty)
            *hasProperty = true;
        return args->context()->callData->args[index].asReturnedValue();
    }
    if (hasProperty)
        *hasProperty = false;
    return Encode::undefined();
}

void ArgumentsObject::putIndexed(Managed *m, uint index, const Value &value)
{
    ArgumentsObject *args = static_cast<ArgumentsObject *>(m);
    if (!args->fullyCreated() && index >= static_cast<uint>(args->context()->callData->argc))
        args->fullyCreate();

    if (args->fullyCreated()) {
        Object::putIndexed(m, index, value);
        return;
    }

    args->context()->callData->args[index] = value;
}

bool ArgumentsObject::deleteIndexedProperty(Managed *m, uint index)
{
    ArgumentsObject *args = static_cast<ArgumentsObject *>(m);
    if (!args->fullyCreated())
        args->fullyCreate();
    return Object::deleteIndexedProperty(m, index);
}

PropertyAttributes ArgumentsObject::queryIndexed(const Managed *m, uint index)
{
    const ArgumentsObject *args = static_cast<const ArgumentsObject *>(m);
    if (args->fullyCreated())
        return Object::queryIndexed(m, index);

    uint numAccessors = qMin((int)args->context()->formalParameterCount(), args->context()->callData->argc);
    uint argCount = args->context()->callData->argc;
    if (index >= argCount)
        return PropertyAttributes();
    if (index >= numAccessors)
        return Attr_Data;
    return Attr_Accessor;
}

DEFINE_OBJECT_VTABLE(ArgumentsGetterFunction);

void ArgumentsGetterFunction::call(const Managed *getter, Scope &scope, CallData *callData)
{
    ExecutionEngine *v4 = static_cast<const ArgumentsGetterFunction *>(getter)->engine();
    Scoped<ArgumentsGetterFunction> g(scope, static_cast<const ArgumentsGetterFunction *>(getter));
    Scoped<ArgumentsObject> o(scope, callData->thisObject.as<ArgumentsObject>());
    if (!o) {
        scope.result = v4->throwTypeError();
        return;
    }

    Q_ASSERT(g->index() < static_cast<unsigned>(o->context()->callData->argc));
    scope.result = o->context()->callData->args[g->index()];
}

DEFINE_OBJECT_VTABLE(ArgumentsSetterFunction);

void ArgumentsSetterFunction::call(const Managed *setter, Scope &scope, CallData *callData)
{
    ExecutionEngine *v4 = static_cast<const ArgumentsSetterFunction *>(setter)->engine();
    Scoped<ArgumentsSetterFunction> s(scope, static_cast<const ArgumentsSetterFunction *>(setter));
    Scoped<ArgumentsObject> o(scope, callData->thisObject.as<ArgumentsObject>());
    if (!o) {
        scope.result = v4->throwTypeError();
        return;
    }

    Q_ASSERT(s->index() < static_cast<unsigned>(o->context()->callData->argc));
    o->context()->callData->args[s->index()] = callData->argc ? callData->args[0].asReturnedValue() : Encode::undefined();
    scope.result = Encode::undefined();
}

void ArgumentsObject::markObjects(Heap::Base *that, ExecutionEngine *e)
{
    ArgumentsObject::Data *o = static_cast<ArgumentsObject::Data *>(that);
    if (o->context)
        o->context->mark(e);
    if (o->mappedArguments)
        o->mappedArguments->mark(e);

    Object::markObjects(that, e);
}

uint ArgumentsObject::getLength(const Managed *m)
{
    const ArgumentsObject *a = static_cast<const ArgumentsObject *>(m);
    if (a->propertyData(Heap::ArgumentsObject::LengthPropertyIndex)->isInteger())
        return a->propertyData(Heap::ArgumentsObject::LengthPropertyIndex)->integerValue();
    return Primitive::toUInt32(a->propertyData(Heap::ArgumentsObject::LengthPropertyIndex)->doubleValue());
}
