#ifndef BLUETOOTHLEUART_H
#define BLUETOOTHLEUART_H

#include <QBluetoothDeviceDiscoveryAgent>
#include <QBluetoothDeviceInfo>
#include <QLowEnergyController>
#include <QLowEnergyService>

#ifdef QBluetoothLeUart_QML
#include <QQmlApplicationEngine>
#endif

#include "qbluetoothleuartdevice.h"

#define UARTSERVICEUUID "6e400001-b5a3-f393-e0a9-e50e24dcca9e"
#define RXUUID "6e400002-b5a3-f393-e0a9-e50e24dcca9e"
#define TXUUID "6e400003-b5a3-f393-e0a9-e50e24dcca9e"

class QBluetoothLeUart : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QList<QBluetoothLeUartDevice*> avaliableDevices READ getAvailableDevices NOTIFY avaliableDevicesChanged)
    Q_PROPERTY(BluetoothLeUartState state READ getState NOTIFY stateChanged)

public:
    enum BluetoothLeUartState {
        Idle = 0,
        Scanning,
        ScanFinished,
        Connecting,
        Connected,
        ServiceFound,
        AcquireData
    };
    Q_ENUM(BluetoothLeUartState)

    enum BluetoothScanError {
        UnknownError,
        AdapterTurnedOffError,
        InputOutputError
    };
    Q_ENUM(BluetoothScanError);

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

    static void init();

private:
    QBluetoothLeUartDevice *currentBluetoothDevice;
    QBluetoothDeviceDiscoveryAgent *bluetoothDeviceDiscoveryAgent;
    //QList<QObject*> m_qlDevices;
    QList<QBluetoothLeUartDevice*> availableDevices;
    //QList<QString> m_qlFoundDevices;
    QVector<quint16> m_qvMeasurements;
    QLowEnergyController *bluetoothController;
    QLowEnergyService *bluetoothService;
    QLowEnergyDescriptor bluetoothTransmissionDescriptor;
    bool foundValidUARTService;

    QBluetoothLeUart::BluetoothLeUartState state;

public slots:

    /* Slots for user */
    Q_INVOKABLE QBluetoothLeUart::BluetoothLeUartState getState() const;

    Q_INVOKABLE void startScanningForDevices();
    Q_INVOKABLE void stopScanningForDevices();
    Q_INVOKABLE QList<QBluetoothLeUartDevice*> getAvailableDevices();
    Q_INVOKABLE void connectToDevice(QBluetoothLeUartDevice *device);
    Q_INVOKABLE void sendData(QString s);
    Q_INVOKABLE void disconnectFromDevice();

private slots:
    void setState(QBluetoothLeUart::BluetoothLeUartState newState);

    /* Slots for QBluetothDeviceDiscoveryAgent */
    void handleDeviceDiscovered(const QBluetoothDeviceInfo&);
    void handleScanFinished();
    void handleDeviceScanError(QBluetoothDeviceDiscoveryAgent::Error);

    /* Slots for QLowEnergyController */
    void handleServiceDiscovered(const QBluetoothUuid &);
    void handleServiceScanDone();
    void handleControllerError(QLowEnergyController::Error);
    void handleDeviceConnected();
    void handleDeviceDisconnected();

    /* Slotes for QLowEnergyService */
    void handleServiceStateChange(QLowEnergyService::ServiceState s);
    void handleServiceCharacteristicChange(const QLowEnergyCharacteristic &c, const QByteArray &value);
    void handleServiceDescriptorWritten(const QLowEnergyDescriptor &d, const QByteArray &value);

signals:
    /* Signals for user */
    void stateChanged(QBluetoothLeUart::BluetoothLeUartState newState);
    void avaliableDevicesChanged(QList<QBluetoothLeUartDevice*> avaliableDevices);
    void foundNewDevice(QBluetoothLeUartDevice* device);
    void scanningErrorOccured(QBluetoothLeUart::BluetoothScanError error);
    void dataReceived(QString s);
    void connectedToDevice();

};

#endif // BLUETOOTHLEUART_H