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#ifndef OPCUAMACHINEBACKEND_H
#define OPCUAMACHINEBACKEND_H

#include <QtOpcUa>

#include <QObject>

class OpcUaMachineBackend : public QObject
{
    Q_OBJECT

public:

    enum class MachineState : quint32 {
        Idle,
        Pumping,
        Flushing
    };
    Q_ENUM(MachineState)

    Q_PROPERTY(double percentFilledTank1 READ percentFilledTank1 NOTIFY percentFilledTank1Changed)
    Q_PROPERTY(double percentFilledTank2 READ percentFilledTank2 NOTIFY percentFilledTank2Changed)
    Q_PROPERTY(double tank2TargetPercent READ tank2TargetPercent NOTIFY tank2TargetPercentChanged)
    Q_PROPERTY(OpcUaMachineBackend::MachineState machineState READ machineState NOTIFY machineStateChanged)
    Q_PROPERTY(bool tank2ValveState READ tank2ValveState NOTIFY tank2ValveStateChanged)
    Q_PROPERTY(bool connected READ connected NOTIFY connectedChanged)
    Q_PROPERTY(QString machineDesignation READ machineDesignation NOTIFY machineDesignationChanged)
    Q_PROPERTY(QString message READ message NOTIFY messageChanged)
    Q_PROPERTY(QStringList backends READ backends NOTIFY backendsChanged)

    OpcUaMachineBackend(QObject *parent = nullptr);
    ~OpcUaMachineBackend();

    double percentFilledTank1() const;
    double percentFilledTank2() const;
    double tank2TargetPercent() const;
    bool tank2ValveState() const;
    MachineState machineState() const;
    bool connected() const;
    QString machineDesignation() const;
    QString message() const;
    bool successfullyCreated() const;
    void setMessage(const QString &message);
    QStringList backends() const;

    Q_INVOKABLE void connectToEndpoint(const QString &url, qint32 index);
    Q_INVOKABLE void disconnectFromEndpoint();
    Q_INVOKABLE void machineWriteTank2TargetPercent(double value);
    Q_INVOKABLE void startPump();
    Q_INVOKABLE void stopPump();
    Q_INVOKABLE void flushTank2();
    Q_INVOKABLE void resetSimulation();

public slots:
    void requestEndpointsFinished(const QVector<QOpcUaEndpointDescription> &endpoints);
    void clientStateHandler(QOpcUaClient::ClientState state);
    void machineStateUpdated(QOpcUa::NodeAttribute attr, const QVariant &value);
    void percentFilledTank1Updated(QOpcUa::NodeAttribute attr, const QVariant &value);
    void percentFilledTank2Updated(QOpcUa::NodeAttribute attr, const QVariant &value);
    void tank2TargetPercentUpdated(QOpcUa::NodeAttribute attr, const QVariant &value);
    void tank2ValveStateUpdated(QOpcUa::NodeAttribute attr, const QVariant &value);
    void machineDesignationRead(QOpcUa::NodeAttributes attr);
    void setpointWritten(QOpcUa::NodeAttribute attr, QOpcUa::UaStatusCode status);
    void handleMethodResult(QString methodNodeId, const QVariant &result, QOpcUa::UaStatusCode statusCode);
    void enableMonitoringFinished(QOpcUa::NodeAttribute attr, QOpcUa::UaStatusCode status);

signals:
    void percentFilledTank1Changed(double value);
    void percentFilledTank2Changed(double value);
    void tank2TargetPercentChanged(double value);
    void tank2ValveStateChanged(bool state);
    void machineStateChanged(OpcUaMachineBackend::MachineState state);
    void connectedChanged(bool connected);
    void machineDesignationChanged(QString designation);
    void messageChanged(QString message);
    void backendsChanged(QStringList backends);

private:
    void setBackends(const QStringList &backends);

    QScopedPointer<QOpcUaClient> m_client;
    QScopedPointer<QOpcUaNode> m_machineStateNode;
    QScopedPointer<QOpcUaNode> m_percentFilledTank1Node;
    QScopedPointer<QOpcUaNode> m_percentFilledTank2Node;
    QScopedPointer<QOpcUaNode> m_tank2TargetPercentNode;
    QScopedPointer<QOpcUaNode> m_tank2ValveStateNode;
    QScopedPointer<QOpcUaNode> m_machineNode;
    QScopedPointer<QOpcUaNode> m_machineDesignationNode;
    double m_percentFilledTank1;
    double m_percentFilledTank2;
    double m_tank2TargetPercent;
    bool m_tank2ValveState;
    MachineState m_machineState;
    QString m_machineDesignation;

    bool m_connected;
    QString m_message;

    bool m_successfullyCreated;
    QStringList m_backends;
};

Q_DECLARE_METATYPE(OpcUaMachineBackend::MachineState)

#endif // OPCUAMACHINEBACKEND_H