const int buttonPin = 3; //Button to perform interrupt

unsigned long button_time = 0;
unsigned long last_button_time = 0;

const uint8_t PROGMEM gamma8[] = {
  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,
  1,  1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  2,  2,  2,
  2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,  4,  5,  5,  5,
  5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  9,  9,  9, 10,
  10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
  17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
  25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
  37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
  51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
  69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
  90, 92, 93, 95, 96, 98, 99, 101, 102, 104, 105, 107, 109, 110, 112, 114,
  115, 117, 119, 120, 122, 124, 126, 127, 129, 131, 133, 135, 137, 138, 140, 142,
  144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 167, 169, 171, 173, 175,
  177, 180, 182, 184, 186, 189, 191, 193, 196, 198, 200, 203, 205, 208, 210, 213,
  215, 218, 220, 223, 225, 228, 231, 233, 236, 239, 241, 244, 247, 249, 252, 255
};

int option;
int pwmvalue;
int pwmvalue2;
int fadestate;

long myMillis;
bool check;

int counter;
int delaytime = 4500; // SET DELAY TIME HERE

void setup() {
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);

  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(buttonPin), button_ISR, CHANGE);

  Serial.print("Option: ");
  Serial.print("0 (0/1/2)");
  Serial.println();
}
void loop() {
  if (option == 0) {
    analogWrite(11, 255);
    analogWrite(10, 0);
    analogWrite(9, 255);
  }
  else if (option == 1) {
    analogWrite(11, 255);
    analogWrite(10, 255);
    analogWrite(9, 0);
  }
  else if (option == 2) {

    if (check == false) {
      Serial.println("A to 100% and C to 100%");
      analogWrite(11, 255);
      analogWrite(10, 0);
      analogWrite(9, 255);
      Serial.print("delay ");
      Serial.print(delaytime / 1000);
      Serial.println(" seconds");
      check = true;
      myMillis = millis();
    }

    if (check && millis() > myMillis + delaytime) {
      check = false;
      pwmvalue = 0;
      pwmvalue2 = 255;
      fadestate = 1;
      option = 4;
      Serial.println("fade B to 100%, C to 0%");
    }

  }

  else if (option == 4) {

    if (fadestate == 1) {
      if (check == false) {
        pwmvalue++;
        pwmvalue2 = pwmvalue2 - 1;
      analogWrite(9, pgm_read_byte(&gamma8[pwmvalue2]));
      analogWrite(10, pgm_read_byte(&gamma8[pwmvalue]));
        counter++;
        if (counter == 10) {
           Serial.print("pwmvalue1: ");
           Serial.print(pwmvalue);
           Serial.println();
           Serial.print("pwmvalue2: ");
         Serial.print(pwmvalue2);
         Serial.println();
         counter = 0;
        }
        delay(12);
      }

      if (pwmvalue > 254) {

        if (check == false) {
          Serial.print("delay ");
          Serial.print(delaytime / 1000);
          Serial.println(" seconds");
          check = true;
          myMillis = millis();
        }

        if (check && millis() > myMillis + delaytime) {
          check = false;
          pwmvalue = 255;
          pwmvalue2 = 0;
          fadestate = 0;
          Serial.println("fade B to 0%, C to 100%");
        }

      }

    } else {
      pwmvalue = pwmvalue - 1;
      pwmvalue2++;
      analogWrite(9, pgm_read_byte(&gamma8[pwmvalue2]));
      analogWrite(10, pgm_read_byte(&gamma8[pwmvalue]));
      delay(12);

      if (pwmvalue2 > 254) {
        option = 2;
        //Serial.println("A to 100% and C to 100%");

      }
    }
  }
}
void button_ISR() {
  button_time = millis();

  if (button_time - last_button_time > 250) {
    option++;
    check = false;
    myMillis = millis();
    if (option > 2) option = 0;
    if (option == 2) fadestate = 0;
    Serial.print("Option: ");
    Serial.print(option);
    Serial.println();
    last_button_time = button_time;
  }
}