#ifndef HELLIGKEIT_ROTARY_H
#define HELLIGKEIT_ROTARY_H

#include <Arduino.h>

class Rotary {

public:

  typedef void (*callback_t)(int delta);

private:

  const uint8_t pinCLK;

  const uint8_t pinDT;

  bool lastCLK = false;

  callback_t callback;

public:

  Rotary(const uint8_t pinCLK, const uint8_t pinDT, callback_t callback) : pinCLK(pinCLK), pinDT(pinDT), callback(callback) {
    //
  }

  void setup() {
    pinMode(pinCLK, INPUT_PULLUP);
    pinMode(pinDT, INPUT_PULLUP);
    lastCLK = digitalRead(pinCLK) == HIGH;
  }

  void loop() {
    const bool currentCLK = digitalRead(pinCLK) == HIGH;
    if (currentCLK != lastCLK && currentCLK) {
      if ((digitalRead(pinDT) == HIGH) != currentCLK) {
        callback(+1);
      } else {
        callback(-1);
      }
    }
    lastCLK = currentCLK;
  }

};

#endif