#define ENCODER_CLK 2 
#define ENCODER_DT  3
#define ENCODER_SW 4//encoder button
#define led1 5
#define led2 6

int value1 = 60; //initial value for led 1
int value2 = 60; //initial value for led 2
int change = 5; // change in value per encoder tick
int upper_limit = 255; //upper limit for value
int lower_limit = 0; //lower limit for value

bool toggle_state = HIGH; //led selection
int buttonState; //current encoder button state
int lastButtonState = HIGH; // last encoder button state
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;// debounce time thereshold in milisecond

void setup() {
  Serial.begin(115200);
  pinMode(ENCODER_CLK, INPUT_PULLUP);
  pinMode(ENCODER_DT, INPUT_PULLUP);
  pinMode(ENCODER_SW, INPUT_PULLUP);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), readEncoder, FALLING);
}

void readEncoder() {
  if (toggle_state){
    int dtValue = digitalRead(ENCODER_DT);
    if (dtValue == HIGH) {
      if (value1<upper_limit){
        value1=value1+change;
      }
      Serial.print(value1);
      Serial.println(" Rotated clockwise ⏩");

    }
    if (dtValue == LOW) {
      if (value1>lower_limit){
        value1=value1-change;
      }
      Serial.print(value1);
      Serial.println(" Rotated counterclockwise ⏪");
    }
  }
  else {
    int dtValue = digitalRead(ENCODER_DT);
    if (dtValue == HIGH) {
      if (value2<upper_limit){
        value2=value2+change;
      }
      Serial.print(value2);
      Serial.println(" Rotated clockwise ⏩");

    }
    if (dtValue == LOW) {
      if (value2>lower_limit){
        value2=value2-change;
      }
      Serial.print(value2);
      Serial.println(" Rotated counterclockwise ⏪");
    }
  }
}

void loop() {
  int reading = digitalRead(ENCODER_SW);
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {

    if (reading != buttonState) {
      buttonState = reading;

      if (buttonState == LOW) {
        toggle_state = !toggle_state;
      }
    }
  }
  lastButtonState = reading;
  
  if (toggle_state == HIGH) {
    analogWrite(led1, value1);
  }

  else {
    analogWrite(led2, value2);
  }
}