#pragma once


#include <functional>
#include <stdint.h>

#include "esp_err.h"
#include "result.hpp"

#include "gpio_expander.hpp"

namespace drivers {

struct TouchWheelData {
  bool is_touched = false;
  uint8_t wheel_position = -1;
};

class TouchWheel {
 public:
  enum Error {
    FAILED_TO_BOOT,
    FAILED_TO_CONFIGURE,
  };
  static auto create(GpioExpander* expander)
      -> cpp::result<std::unique_ptr<TouchWheel>, Error>;

  TouchWheel(GpioExpander* gpio);
  ~TouchWheel();

  // Not copyable or movable.
  TouchWheel(const TouchWheel&) = delete;
  TouchWheel& operator=(const TouchWheel&) = delete;

  auto Update() -> void;
  auto GetTouchWheelData() const -> TouchWheelData;

 private:
  GpioExpander* gpio_;
  TouchWheelData data_;
  
  enum Register {
    FIRMWARE_VERSION = 0x1,
    DETECTION_STATUS = 0x2,
    KEY_STATUS_A     = 0x3,
    KEY_STATUS_B     = 0x4,
    SLIDER_POSITION  = 0x5,
    CALIBRATE        = 0x6,
    RESET            = 0x7,
    LOW_POWER        = 0x8,
    SLIDER_OPTIONS   = 0x14,
  };


  void WriteRegister(uint8_t reg, uint8_t val);
  void ReadRegister(uint8_t reg, uint8_t* data, uint8_t count);

};

}  // namespace drivers