#define colorBtn 6
#define durationBtn 7
#define RedLED 13
#define GreenLED 12
#define BlueLED 11
#define MAXCOLORS 7
#define DELAYCOUNT 5

bool colors[][3] = {
  {1,1,1} , {1,0,0},{0,1,0},{0,0,1},  // wrgb
  {0,1,1} , {1,1,0},{1,0,1},{0,0,0} // cymk
};
char* colorNames[] = {
  "white","red","green","blue",
  "cyan","yellow","megenta","black" // black is just off so do not need to toggle to black
};

int ledDelays[] = {
  1000, 800, 600, 400, 200
};
unsigned long debounceDelay = 50;
int8_t ledDelayIdx=0;
int8_t ledColorIdx=0;

void setup() {
  pinMode(RedLED, OUTPUT);
  pinMode(GreenLED, OUTPUT);
  pinMode(BlueLED, OUTPUT);
  pinMode(colorBtn, INPUT_PULLUP);
  pinMode(durationBtn, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(colorBtn), colorBtnPressHandler, CHANGE);
  attachInterrupt(digitalPinToInterrupt(durationBtn), durationBtnPressHandler, CHANGE);  
  Serial.begin(9600);  
}

volatile bool cbtnPinState = HIGH;
unsigned long cbtnlastDebounceTime = 0;
void colorBtnPressHandler(){
  // read the button pin current state
  bool currentBtnPinState = digitalRead(colorBtn);

  // debounce button
  if (currentBtnPinState != cbtnPinState) // works when button state is different
  {
    if (millis() - cbtnlastDebounceTime > debounceDelay) // debouce delay
    {
      cbtnPinState = currentBtnPinState; // update button state
      
      // works only on key up
      if(!cbtnPinState) 
      {
        ledColorIdx++;
        ledColorIdx%=MAXCOLORS;

        // update serial monitor
        Serial.print("Color: ");
        Serial.println(colorNames[ledColorIdx]);
      }

      cbtnlastDebounceTime = millis(); // log the debounce timestamp
    }
  }
}

volatile bool dbtnPinState = HIGH;
unsigned long dbtnlastDebounceTime = 0;
void durationBtnPressHandler(){
  // read the button pin current state
  bool currentBtnPinState = digitalRead(durationBtn);

  // debounce button
  if (currentBtnPinState != dbtnPinState) // works when button state is different
  {
    if (millis() - dbtnlastDebounceTime > debounceDelay) // debouce delay
    {
      dbtnPinState = currentBtnPinState; // update button state
      
      // works only on key up
      if(!dbtnPinState) 
      {
        ledDelayIdx++;
        ledDelayIdx%=DELAYCOUNT;

        // update serial monitor
        Serial.print("Duration: ");
        Serial.print(ledDelays[ledDelayIdx]);
        Serial.println("ms");
      }

      dbtnlastDebounceTime = millis(); // log the debounce timestamp
    }
  }
}

void loop() {
  digitalWrite(RedLED, colors[ledColorIdx][0]);
  digitalWrite(GreenLED, colors[ledColorIdx][1]);
  digitalWrite(BlueLED, colors[ledColorIdx][2]);
  delay(ledDelays[ledDelayIdx]);
  digitalWrite(RedLED, LOW);
  digitalWrite(GreenLED, LOW);
  digitalWrite(BlueLED, LOW);
  delay(ledDelays[ledDelayIdx]);  
  delay(10);//ledDelays[ledDelayIdx]);  
}