#ifndef MICROBIT_LED_SERVICE_H
#define MICROBIT_LED_SERVICE_H

#include "MicroBit.h"

// UUIDs for our service and characteristics
extern const uint8_t  MicroBitLEDServiceUUID[];
extern const uint8_t  MicroBitLEDServiceMatrixUUID[]; 
extern const uint8_t  MicroBitLEDServiceTextUUID[]; 
extern const uint8_t  MicroBitLEDServiceScrollingSpeedUUID[]; 


/**
  * Class definition for a MicroBit BLE Event Service.
  * Provides a _ble gateway onto the MicroBit Message Bus.
  */
class MicroBitLEDService
{                                    
    public:
    
    /**
      * Constructor. 
      * Create a representation of the LEDService
      * @param BLE The instance of a BLE device that we're running on.
      */
    MicroBitLEDService(BLEDevice &_ble);  
    
    /**
      * Callback. Invoked when any of our attributes are written via BLE.
      */
    void onDataWritten(const GattWriteCallbackParams *params);

    /**
      * Callback. Invoked when any of our attributes are read via BLE.
      */
    void onDataRead(GattReadAuthCallbackParams *params);
    
    private:

    // Bluetooth stack we're running on.
    BLEDevice           &ble;

    // memory for our 8 bit control characteristics.
    uint8_t             matrixCharacteristicBuffer[5];
    uint16_t            scrollingSpeedCharacteristicBuffer;
    uint8_t             textCharacteristicBuffer[MICROBIT_BLE_MAXIMUM_SCROLLTEXT];

    // Handles to access each characteristic when they are held by Soft Device.
    GattAttribute::Handle_t matrixCharacteristicHandle;
    GattAttribute::Handle_t textCharacteristicHandle;
    GattAttribute::Handle_t scrollingSpeedCharacteristicHandle;

    // We hold a copy of the GattCharacteristic, as mbed's BLE API requires this to provide read callbacks (pity!).
    GattCharacteristic  matrixCharacteristic;
};


#endif