/*
    This file is part of the syndication library
    SPDX-FileCopyrightText: 2006 Frank Osterfeld <osterfeld@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#include "statement.h"
#include "literal.h"
#include "model.h"
#include "model_p.h"
#include "property.h"
#include "resource.h"

#include <QString>
#include <QWeakPointer>

namespace Syndication
{
namespace RDF
{
class SYNDICATION_NO_EXPORT Statement::StatementPrivate
{
public:
    uint subjectID;
    uint predicateID;
    uint objectID;
    QWeakPointer<Model::ModelPrivate> model;

    bool operator==(const StatementPrivate &other) const
    {
        // FIXME: use better check that works also with multiple models
        return subjectID == other.subjectID && predicateID == other.predicateID && objectID == other.objectID;
    }
};

Statement::Statement()
    : d(new StatementPrivate)
{
    d->subjectID = 0;
    d->predicateID = 0;
    d->objectID = 0;
}

Statement::Statement(const Statement &other)
{
    d = other.d;
}

Statement::Statement(ResourcePtr subject, PropertyPtr predicate, NodePtr object)
    : d(new StatementPrivate)
{
    d->model = subject->model().d;
    d->subjectID = subject->id();
    d->predicateID = predicate->id();
    d->objectID = object->id();
}

Statement::~Statement()
{
}

Statement &Statement::operator=(const Statement &other)
{
    d = other.d;
    return *this;
}

bool Statement::operator==(const Statement &other) const
{
    if (!d || !other.d) {
        return d == other.d;
    }

    return *d == *(other.d);
}

bool Statement::isNull() const
{
    return d->subjectID == 0;
}

ResourcePtr Statement::subject() const
{
    const QSharedPointer<Model::ModelPrivate> m = d ? d->model.toStrongRef() : QSharedPointer<Model::ModelPrivate>();
    return m ? m->resourceByID(d->subjectID) : ResourcePtr(new Resource);
}

PropertyPtr Statement::predicate() const
{
    const QSharedPointer<Model::ModelPrivate> m = d ? d->model.toStrongRef() : QSharedPointer<Model::ModelPrivate>();
    return m ? m->propertyByID(d->predicateID) : PropertyPtr(new Property());
}

NodePtr Statement::object() const
{
    const QSharedPointer<Model::ModelPrivate> m = d ? d->model.toStrongRef() : QSharedPointer<Model::ModelPrivate>();
    return m ? m->nodeByID(d->objectID) : NodePtr(LiteralPtr(new Literal()));
}

ResourcePtr Statement::asResource() const
{
    const QSharedPointer<Model::ModelPrivate> m = d ? d->model.toStrongRef() : QSharedPointer<Model::ModelPrivate>();

    if (isNull() || !m || !m->nodeByID(d->objectID)->isResource()) {
        return ResourcePtr(new Resource);
    }

    return m->resourceByID(d->objectID);
}

QString Statement::asString() const
{
    if (isNull()) {
        return QString();
    }

    const QSharedPointer<Model::ModelPrivate> m = d ? d->model.toStrongRef() : QSharedPointer<Model::ModelPrivate>();
    return m ? m->nodeByID(d->objectID)->text() : QString();
}

} // namespace RDF
} // namespace Syndication