// Copyright (C) 2017 basysKom GmbH, opensource@basyskom.com
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QOPCUABACKEND_P_H
#define QOPCUABACKEND_P_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 <QtOpcUa/qopcuaclient.h>
#include <QtOpcUa/qopcuaendpointdescription.h>
#include <QtOpcUa/qopcuahistoryevent.h>
#include <private/qopcuanodeimpl_p.h>

#include <QtCore/qobject.h>

#include <functional>

QT_BEGIN_NAMESPACE

class QOpcUaMonitoringParameters;

class Q_OPCUA_EXPORT QOpcUaBackend : public QObject
{
    Q_OBJECT

public:
    explicit QOpcUaBackend();
    virtual ~QOpcUaBackend();

    static Q_DECL_CONSTEXPR size_t nodeAttributeEnumBits()
    {
        return sizeof(std::underlying_type<QOpcUa::NodeAttribute>::type) * CHAR_BIT;
    }

    QOpcUa::Types attributeIdToTypeId(QOpcUa::NodeAttribute attr);

    double revisePublishingInterval(double requestedValue, double minimumValue);
    static bool verifyEndpointDescription(const QOpcUaEndpointDescription &endpoint, QString *message = nullptr);

Q_SIGNALS:
    void stateAndOrErrorChanged(QOpcUaClient::ClientState state,
                                QOpcUaClient::ClientError error);
    void attributesRead(quint64 handle, QList<QOpcUaReadResult> attributes, QOpcUa::UaStatusCode serviceResult);
    void attributeWritten(quint64 handle, QOpcUa::NodeAttribute attribute, QVariant value, QOpcUa::UaStatusCode statusCode);
    void methodCallFinished(quint64 handle, QString methodNodeId, QVariant result, QOpcUa::UaStatusCode statusCode);

    void dataChangeOccurred(quint64 handle, QOpcUaReadResult res);
    void eventOccurred(quint64 handle, QVariantList fields);
    void monitoringEnableDisable(quint64 handle, QOpcUa::NodeAttribute attr, bool subscribe, QOpcUaMonitoringParameters status);
    void monitoringStatusChanged(quint64 handle, QOpcUa::NodeAttribute attr, QOpcUaMonitoringParameters::Parameters items,
                           QOpcUaMonitoringParameters param);
    void browseFinished(quint64 handle, QList<QOpcUaReferenceDescription> children, QOpcUa::UaStatusCode statusCode);

    void resolveBrowsePathFinished(quint64 handle, const QList<QOpcUaBrowsePathTarget> &targets,
                                   const QList<QOpcUaRelativePathElement> &path, QOpcUa::UaStatusCode statusCode);
    void endpointsRequestFinished(QList<QOpcUaEndpointDescription> endpoints, QOpcUa::UaStatusCode statusCode, QUrl requestUrl);
    void findServersFinished(QList<QOpcUaApplicationDescription> servers, QOpcUa::UaStatusCode statusCode, QUrl requestUrl);
    void readNodeAttributesFinished(QList<QOpcUaReadResult> results, QOpcUa::UaStatusCode serviceResult);
    void writeNodeAttributesFinished(QList<QOpcUaWriteResult> results, QOpcUa::UaStatusCode serviceResult);
    void readHistoryDataFinished(quint64 handle, bool isHandleValid, QOpcUaHistoryReadRawRequest request, QList<QOpcUaHistoryData> results, QOpcUa::UaStatusCode serviceResult);

    void addNodeFinished(QOpcUaExpandedNodeId requestedNodeId, QString assignedNodeId, QOpcUa::UaStatusCode statusCode);
    void deleteNodeFinished(QString nodeId, QOpcUa::UaStatusCode statusCode);
    void addReferenceFinished(QString sourceNodeId, QString referenceTypeId, QOpcUaExpandedNodeId targetNodeId, bool isForwardReference,
                              QOpcUa::UaStatusCode statusCode);
    void deleteReferenceFinished(QString sourceNodeId, QString referenceTypeId, QOpcUaExpandedNodeId targetNodeId, bool isForwardReference,
                              QOpcUa::UaStatusCode statusCode);
    void connectError(QOpcUaErrorState *errorState);
    void passwordForPrivateKeyRequired(QString keyFilePath, QString *password, bool previousTryWasInvalid);

    void historyDataAvailable(QList<QOpcUaHistoryData> data, QList<QByteArray> continuationPoints, QOpcUa::UaStatusCode serviceResult, uintptr_t handle);
    void historyEventsAvailable(QList<QOpcUaHistoryEvent> data, QList<QByteArray> continuationPoints, QOpcUa::UaStatusCode serviceResult, uintptr_t handle);

    void registerNodesFinished(QStringList nodesToRegister, QStringList registeredNodeIds, QOpcUa::UaStatusCode statusCode);
    void unregisterNodesFinished(QStringList nodesToUnregister, QOpcUa::UaStatusCode statusCode);

private:
    Q_DISABLE_COPY(QOpcUaBackend)
};

static inline void qt_forEachAttribute(QOpcUa::NodeAttributes attributes, const std::function<void(QOpcUa::NodeAttribute attribute)> &f)
{
    for (uint i = 0; i < QOpcUaBackend::nodeAttributeEnumBits(); ++i) {
        if (!(attributes & (1 << i)))
            continue;
        QOpcUa::NodeAttribute currentAttribute = static_cast<QOpcUa::NodeAttribute>(1 << i);
        f(currentAttribute);
    }
}

QT_END_NAMESPACE

#endif // QOPCUABACKEND_P_H