#define REDPIN 5
#define GREENPIN 6
#define BLUEPIN 3

int currentR = 0;
int currentG = 0;
int currentB = 0;
bool pulse = false;
bool inProgress = false;
unsigned long currentMillis = millis();
bool alternating = false;;

void setup() {
    pinMode(REDPIN, OUTPUT);
    pinMode(GREENPIN, OUTPUT);
    pinMode(BLUEPIN, OUTPUT);
    Serial.begin(9600);
}

void loop() {



    if (pulse) {
        if (!alternating) {
            SmoothFade(currentR, currentG, currentB, 0, 0, 0);
            alternating = true;
        }
        else {
            SmoothFade(0, 0, 0, currentR, currentG, currentB);
            alternating = false;
        }
    }

}
void serialEvent() {
    if (Serial.available() == 1) {
        String input = Serial.readString();

        if (input[0] == 35) {
            long number = strtol(&input[1], NULL, 16);

            long r = number >> 16;
            long g = number >> 8 & 0xFF;
            long b = number & 0xFF;

            Serial.println("Color set to: " + input);
            SmoothFade(currentR, currentG, currentB, r, g, b);

            currentR = r;
            currentG = g;
            currentB = b;

        }

        if (input == "pulse") {
            if (pulse == false) {
                pulse = true;
                Serial.println("Pulsing!");
            }
            else {
                pulse = false;
                Serial.println("Pulsing NOT!");
            }
        }
    }
}
void SmoothFade(int currR, int currG, int currB, int r, int g, int b) {
    int curR = currR, curG = currG, curB = currB;
    int stepR = curR - r, stepG = curG - g, stepB = curB - b;

    for (int i = 255; i > 0; i--)
    {

        if (i % (255 / abs(stepR)) == 0 && stepR != 0) {
            if (stepR < 0 && curR < 255) {
                curR++;
            }
            else if (curR > 0) {
                curR--;
            }
            analogWrite(REDPIN, curR);
        }
        if (i % (255 / abs(stepG)) == 0 && stepG != 0) {
            if (stepG < 0 && curG < 255) {
                curG++;
            }
            else if (curG > 0) {
                curG--;
            }
            analogWrite(GREENPIN, curG);
        }
        if (i % (255 / abs(stepB)) == 0 && stepB != 0) {
            if (stepB < 0 && curB < 255) {
                curB++;
            }
            else if (curB > 0) {
                curB--;
            }
            analogWrite(BLUEPIN, curB);
        }
        delay(5);
    }
}