#ifndef OMOBIDISPLAYBACKEND_H
#define OMOBIDISPLAYBACKEND_H

#include <QObject>
#include <QTimer>
#include <QJsonDocument>
#include <QCryptographicHash>

#include <qbluetoothleuart.h>
#include <omobidisplaytextmodel.h>

class OmobiDisplayBackend : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QBluetoothLeUart* bleController READ getBleController NOTIFY bleControllerChanged)
    Q_PROPERTY(OmobiDisplayAppState state READ getState WRITE setState NOTIFY stateChanged)
    Q_PROPERTY(OmobiDisplayTextModel* displayTextModel READ getDisplayTextModel NOTIFY displayTextModelChanged)
    Q_PROPERTY(int displayBrightness READ getDisplayBrightness WRITE setDisplayBrightness NOTIFY displayBrightnessChanged)

public:
    explicit OmobiDisplayBackend(QObject *parent = nullptr);

    enum OmobiDisplayAppState {
        Idle,
        Scanning,
        ReadyToConnect,
        Connecting,
        AuthenticationRequired,
        Authenticating,
        Initing,
        Connected,
        Loading
    };
    Q_ENUM(OmobiDisplayAppState)

private:
    enum OmobiDisplayCommand {
        AuthorizeSessionCommand = 0,
        KeepAliveCommand = 1,
        GetAllTextSetsCommand = 10,
        GetTextSetParameterCommand = 11,
        GetDisplayBrightnessCommand = 12,
        SetTextSetParameterCommand = 20,
        SetDisplayBrightnessCommand = 21,
        SetDisplayCodeCommand = 22,
        SetDisplayNameCommand = 23
    };

    enum OmobiDisplayStatusCode {
        Success = 200,
        DisplayControllerError = 501
    };

    OmobiDisplayAppState state;
    QBluetoothLeUart *ble;
    QTimer *keepAliveTimer;
    OmobiDisplayTextModel* displayTextModel;
    int waitingCommands;
    QList<QMap<int, QVariant>> textSetsBuffer;
    int displayBrightness;

public slots:
    Q_INVOKABLE void startScanning();
    Q_INVOKABLE void authenticate(QString secret);
    Q_INVOKABLE QBluetoothLeUart* getBleController();
    Q_INVOKABLE OmobiDisplayAppState getState();
    Q_INVOKABLE OmobiDisplayTextModel* getDisplayTextModel();
    Q_INVOKABLE int getDisplayBrightness();
    Q_INVOKABLE void setDisplayBrightness(int brightness);
    Q_INVOKABLE void setDisplayCode(QString code);
    Q_INVOKABLE void setDisplayName(QString name);

private slots:
    void handleBluetoothStateChange(QBluetoothLeUart::BluetoothLeUartState state);
    void handleFoundNewDevice(QBluetoothLeUartDevice* device);
    void handleBluetoothDeviceConected();

    void handleDisplayTextModelDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>());
    void handleDisplayTextModelRowsInserted(const QModelIndex &parent, int first, int last);
    void handleDisplayTextModelRowsRemoved(const QModelIndex &parent, int first, int last);

    void sendBluetoothCommand(OmobiDisplayCommand command, QVariant data = QVariant());
    void sendBluetoothKeepAlive();
    void handleBluetoothDataReceived(QString s);
    void updateDisplayTextSetParameter(int index, int parameter);
    void updateDisplayTextSetParameter(int index, int parameter, QString value);

    void refreshLoadingState();
    void setState(OmobiDisplayAppState state);

signals:
    void stateChanged();
    void bleControllerChanged();
    void displayTextModelChanged();
    void displayBrightnessChanged();

};

#endif // OMOBIDISPLAYBACKEND_H